Статті в журналах: "Induction Design and construction"

1

Nasir, Bilal A. "Design of Squirrel-Cage Self-Excited 3-phase Induction Generator." International Journal of Engineering and Advanced Technology 11, no. 1 (October 30, 2021): 181–88. http://dx.doi.org/10.35940/ijeat.a3198.1011121.

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Due to the wide utilization of a 3-phase, squirrel-cage, self-excitation generator in renewable energy and isolated areas application, the paper deals with detailed design procedure of this type of generator, in a sequence and systematic manner. The design steps are obtained and executed in a Matlab file of the computer program to suit the newly designed constructions and parameters of the generator. In the new construction, the generator can be operated in a stable and saturation region. Due to the similarity in the construction of induction motor and generator, the formulas used in the calculation of equivalent circuit components of an induction motor may be utilized to calculate the parameters of the induction generator. To obtain optimized induction generator parameters and construction dimensions an ant colony algorithm is used to optimize these construction dimensions and generator parameters. The main objective parameters used in this algorithm are the generator efficiency, the excitation-capacitance, winding temperature rise, and minimum generator size is for 5 HP, 400 V, 50 Hz, and star connection generator.

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2

Galeano, Juan Carlos Castro, Gustavo Hernando Alvarez, and Edwin Javier Becerra Nocua. "Design Validation and Construction of an Induction Furnace Coil." IEEE Latin America Transactions 14, no. 2 (February 2016): 713–20. http://dx.doi.org/10.1109/tla.2016.7437214.

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Woothipatanapan, Sakhon, and Poonsri Wannakarn. "Design and Construction of a Mini Magnetic Levitation Train." Applied Mechanics and Materials 891 (May 2019): 253–62. http://dx.doi.org/10.4028/www.scientific.net/amm.891.253.

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This article presents the design and construction of a mini magnetic levitation train. The design of the train is based on the theory of 3-phase Linear Induction Motor (LIM). The train consists of two main sections. The first part is the linear induction motor, which is the part that drives the train to move. The second part is the magnetic field winding, which is the part that raises the body of the train to float over the rails. Such train can move forward/backward in the same principle as forward/reverse rotation control of 3-phase induction motors. For that reason, this research controls the forward/backward movement of the train with a magnetic contactor set by using the same circuit as the control of the rotation of the 3-phase induction motor. The designed train can lift 1 mm above the rails and move within a distance of 1.48 m along the length of the rails. The test results showed drive voltage, drive force, average time and drive speed of the train. From the details and results of this article can be used as a guide to create a larger magnetic levitation train, which can be used more effectively.

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4

Shiri, Abbas, and Seyede Delaram Sadr. "Design Optimization and Construction of Double-Sided Linear Induction Motor." Journal of Iranian Association of Electrical and Electronics Engineers 19, no. 4 (September 1, 2022): 185–93. http://dx.doi.org/10.52547/jiaeee.19.4.185.

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5

Kumi Owusu, Daniel, and Christian Kwaku Amuzuvi. "Design and Construction of a 3-Phase Induction Motor Wireless Control System." Journal of Electrical and Electronic Engineering 8, no. 3 (2020): 92. http://dx.doi.org/10.11648/j.jeee.20200803.13.

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6

Choi, Kye-Kwang, and Sae-Jong Lim. "Study on Die Construction and Conceptual Design for High-efficiency Induction Motor Prototype." International Journal of Software Engineering and Its Applications 7, no. 5 (September 30, 2013): 39–44. http://dx.doi.org/10.14257/ijseia.2013.7.5.04.

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7

Attaluri, Anilchandra, John Jackowski, Anirudh Sharma, Sri Kamal Kandala, Valentin Nemkov, Chris Yakey, Theodore L. DeWeese, Ananda Kumar, Robert C. Goldstein, and Robert Ivkov. "Design and construction of a Maxwell-type induction coil for magnetic nanoparticle hyperthermia." International Journal of Hyperthermia 37, no. 1 (January 1, 2020): 1–14. http://dx.doi.org/10.1080/02656736.2019.1704448.

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8

Anthony, Zuriman, and Erhaneli Erhaneli. "A New Windings Design of 24 Slot Capacitor-Start Capacitor-Run Induction Motor." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 3463. http://dx.doi.org/10.11591/ijece.v8i5.pp3463-3470.

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The conventional method of a single phase induction motor windings design usually constructed the main and auxiliary windings in both slot. So, there was a complicated winding design if that compare to the three-phase induction motor. Because of that, this study was aimed to design a new windings design of a single phase induction motor that construction like a three-phase induction motor. This study was focused to design a 24 slot capacitor-start capacitor-run induction motor. The windings in the motor are divided in 3 group like a three-phase induction motor. The two windings act as a main windings and the other winding act as auxiliary winding. The current rating of the winding of the proposed single-phase induction motor was 2.74A. The performances of the proposed method were compared with the performances of a three-phase induction motor that had the same current rating. The motor used as a comparator was a three-phase induction of 380/220V, 2.74/4.7A, Y/Δ, cage rotor, 4 poles, 1.5 HP, 1400 RPM, 50Hz. The result of this study showed that the proposed design of single phase induction motor could be operated with better performances than the three-phase comparator induction motor’s.

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9

Nguyen, Thi Van Su, and Kevin Laws. "Changes in higher education teachers’ perceptions of curriculum." Journal of Applied Research in Higher Education 11, no. 1 (February 4, 2019): 76–89. http://dx.doi.org/10.1108/jarhe-06-2018-0097.

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Purpose The purpose of this paper is to examine the degree to which a compulsory induction program for Vietnamese higher education teachers influences participants’ perceptions of curriculum and course design. Design/methodology/approach This case study uses a qualitative, interpretive approach to data collection. Semi-structured interviews were conducted with 15 program participants before they started the program and immediately after they completed the program. Five program presenters also were interviewed and documents related to the program were analyzed. Findings The findings reflect the influence of Biggs’ (2003) constructive alignment approach on participants’ curriculum perceptions, although this approach was not explicitly stated in the program guidelines. Upon the completion of the program, participants realized the importance of their voices in curriculum construction and course design, which was absent from the pre-program findings. However, students’ agency in co-constructing the curriculum and the “being” of curriculum were not perceived. Research limitations/implications The paper adds to the growing literature on induction programs and their relation to curriculum perceptions. Practical implications The paper provides examples of the changes in participants’ perceptions of curriculum and accentuates, what is neglected in the construction of curriculum. Originality/value The paper invites reflection on the design and implementation of curriculum from academic developers, education practitioners and researchers in similar contexts.

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10

DANILUShKIN, A. I., and V. A. DANILUShKIN. "MODELLING OF INDUCTION HEATING OF EXTRUDER BARREL DURING MANUFACTURING EXPANDED POLYSTYRENE SLABS." Urban construction and architecture 1, no. 1 (February 15, 2011): 129–32. http://dx.doi.org/10.17673/vestnik.2011.01.25.

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The mathematical models of the process of indirect induction heating of granulated polystyrene in extruder during manifacturing of expanded polystyrene slabs are viewed. The proposed models are used to design energy-efficient construction of induction heaters in extrusion- type line for the production of expanded polystyrene slabs.

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11

Ch. V. N. Raja and G. Anand, P. D. V. Seshasai. "Design of Sliding Mode Observer Based Controller of Single-Phase Induction Motor." International Journal for Modern Trends in Science and Technology 06, no. 09 (November 25, 2020): 119–24. http://dx.doi.org/10.46501/ijmtst060918.

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Single-phase induction motors are simple in construction, cheap in cost, reliable and easy to repair and maintain. Many controllers were designed to control the speed of a single-phase induction motor, but they are sensitive to plant parameter variations and disturbances. Speed control with very less transient response requires non-linear and robust control methods. Sliding mode control is one of the robust control techniques which is insensitive to disturbances. Here we propose a higher order sliding mode (SM) observer-based controller for a single-phase induction motor. The applied control depends on the dynamic model of the induction motor. The controller is structured by applying a blend of input linearization strategy and higher order sliding mode calculation with consistent estimation of rotor speed and stator currents, which limits the vulnerabilities continuously and lessen the chattering phenomenon in the control effort exertion utilizing a super twisting algorithm.

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12

Ince, Caner-Veli, Anna Chugreeva, Christoph Böhm, Fadi Aldakheel, Johanna Uhe, Peter Wriggers, Bernd-Arno Behrens, and Annika Raatz. "A design concept of active cooling for tailored forming workpieces during induction heating." Production Engineering 15, no. 2 (February 26, 2021): 177–86. http://dx.doi.org/10.1007/s11740-021-01027-5.

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AbstractThe demand for lightweight construction is constantly increasing. One approach to meet this challenge is the development of hybrid components made of dissimilar materials. The use of the hybrid construction method for bulk components has a high potential for weight reduction and increased functionality. However, forming workpieces consisting of dissimilar materials requires specific temperature profiles for achieving sufficient formability. This paper deals with the development of a specific heating and cooling strategy to generate an inhomogeneous temperature distribution in hybrid workpieces. Firstly, the heating process boundaries with regard to temperature parameters required for a successful forming are experimentally defined. Secondly, a design based on the obtained cooling strategy is developed. Next a modelling embedded within an electro-thermal framework provides the basis for a numerical determination of admissible cooling rates to fulfil the temperature constraint. Here, the authors illustrate an algorithmic approach for the optimisation of cooling parameters towards an effective minimum, required for applicable forming processes of tailored forming.

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13

Chen, Zhuo, Junhao Hou, Yong Gu, Wenxuan Shao, and Fen Tao. "Self-induction Dust Removal System Design at Construction Site Based on the Charged Spray." IOP Conference Series: Earth and Environmental Science 170 (July 2018): 022077. http://dx.doi.org/10.1088/1755-1315/170/2/022077.

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14

Tyapin, Aleksey, Vasiliy Panteleev, and Evgeny Kinev. "Mathematical models of non-sinusoidal power supply of a three-phase transverse field MHD inductor." E3S Web of Conferences 270 (2021): 01024. http://dx.doi.org/10.1051/e3sconf/202127001024.

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The article presents an approach to the development of mathematical models of non-sinusoidal and dual-frequency power supply for a linear induction MHD machine for metallurgical purposes. The issues of construction and numerical modeling of the modes of a three-phase inductor for a liquid aluminum stirrer are considered. Reduction of losses is ensured by the use of a toothless design of the MHD inductor. The absence of steel teeth reduces saturation of the magnetic circuit and current distortion. It is proposed to use the parametric model of the inductor under the furnace in the ANSYS environment to clarify the modes of the complex. To take into account mutual induction, using controlled sources, a circuit model was built, and a numerical calculation of the modes was carried out. The characteristics of instantaneous currents and voltages are obtained when powered from a three-phase source with close frequencies, with pronounced beats. It is shown that the presence of mutual inductance redistributes currents in the delta windings, which must be taken into account when developing the design of linear induction machines. It is proposed to use sources with non-sinusoidal periodic currents in the modeling system. The analysis is carried out and the main types of modulated voltage characteristics in the power supply system of the induction MHD stirrer are shown.

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15

Burlaka, Vladimir, Elena Lavrova, Svetlana Podnebennaya, Vitaliy Ivanov, and Serhii Burikov. "Design of an universal source for semi-automatic ac welding and induction heating." Eastern-European Journal of Enterprise Technologies 6, no. 1 (114) (December 29, 2021): 38–46. http://dx.doi.org/10.15587/1729-4061.2021.246397.

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This paper proposes a circuit solution and a power source control algorithm for semi-automatic AC welding with improved energy and weight-size characteristics. A distinctive feature of the designed source is the absence of an input rectifier: welding is carried out with a high-frequency alternating current. That has made it possible to significantly reduce power losses in the source, as well as provide the possibility of implementing induction heating by connecting an inductor to the source output. Another distinctive feature of the designed source is an increased power factor and a reduced level of higher harmonics of the current consumed. The power factor of the described source reaches 0.94 against 0.5÷0.7 for sources equipped with a conventional rectifier with capacitive smoothing. The designed source's composition includes a power supply system for the wire feed drive with speed stabilization due to positive feedback on the motor current. That has made it possible to ensure the stable operation of the drive in a wide range of speeds. A model has also been developed of a flux wire welding torch containing a feed drive and a coil with a wire (up to 100 mm in diameter), placed, in order to reduce the size, in the handle of the torch. In addition to the welding function, the source makes it possible to solve the tasks related to induction heating and/or hardening of small parts; to that end, a compact inductor is connected to its output. Tests of the source showed the feasibility of the proposed ideas and circuit solutions. The dimensions of the source are 190×107×65 mm; weight, 1.4 kg; output current, up to 120 A. The proposed technical solution enables the construction of small-sized, lightweight, universal, easy-to-use power supplies for semi-automatic welding with the option of induction heating

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16

Liang, Gao, Ke Ming Yin, and Yin Hui. "Mechanical Characteristics of Concrete Ballastless Track on the Track Traffic of Linear Induction Motor." Key Engineering Materials 302-303 (January 2006): 725–0. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.725.

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In this paper, based on the elastic foundation beam theory, the influence rules of every combination of loads and operating modes for ballastless track of Linear Induction Motor (LIM) track traffic are studied. In addition, according to the construction character of prefabrication and cast-in-situ, the rules of how construction influences the mechanical characteristics of the ballastless track structure are given. On the basis of synthetical analysis of the distribution rules of ballastless track’s internal force, some appropriate suggestions for design and construction are put forward.

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17

Drabek, Tomasz, Piotr Kapustka, Tomasz Lerch, and Jerzy Skwarczyński. "A Novel Approach to Transverse Flux Machine Construction." Energies 14, no. 22 (November 17, 2021): 7690. http://dx.doi.org/10.3390/en14227690.

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The article presents a concept for a new design of the well-known Transverse Flux Machine (TFM) made with the use of a flat core used in classical electrical machines. The proposed design was first analytically verified and was subsequently verified using the finite element method, which fully corroborated the results. The simulations show that a set of three single-phase TFM machines with slotted flat rotor yokes generates a torque over three times greater than that of an induction motor and twice as large as Fractional Slot Concentrated Winding—Permanent Magnet Synchronous Machines (FSCW-PMSM). The performed comparative calculations confirmed that the torque generated by machines operating on principles similar to TFM can generate a torque much greater than those currently in common use.

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18

Ganesh Sampath, V., Kadaverla Abhishek, and N. C. Lenin. "Design, Development and Electromagnetic Analysis of a Linear Induction Motor." Applied Mechanics and Materials 852 (September 2016): 794–98. http://dx.doi.org/10.4028/www.scientific.net/amm.852.794.

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Linear induction motors (LIMs) are a very effective drive mechanism for actuation and transportation systems. LIMs are capable of generating a non adhesive thrust force, providing both propulsion and levitation forces and is hence considered as a promising propulsion system [1]. LIMs are used in rapid transportation, baggage handling conveyors (belt conveyors), crane drives, theme park rides, induction pumps, impact extrusion machines, flexible manufacturing systems etc. This is attributed to various advantages LIMs have such as, high starting thrust, simple mechanical design and construction, alleviation of gears between motor and the motion device, no backlash, small friction and sustainability for low speed and high speed applications making LIM a strong candidate in applications with linear motion. Force can be uniformly applied to the conveyor belt over a wide area without any mechanical contact by using LIMs to drive conveyor belts, making the drive independent of frictional losses between the rollers and belt. This paper presents a design guide for a longitudinal flux single sided linear induction motor for conveyor application. The design parameters have been verified using two dimensional finite element analysis (2D-FEA). Test results imply the features of LIM that make it a strong candidate for simple conveyor applications.

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Ishiyama, A., and K. Hayashi. "Design and construction of a superconducting cylindrical linear induction motor with AC superconducting primary windings." IEEE Transactions on Appiled Superconductivity 9, no. 2 (June 1999): 1217–20. http://dx.doi.org/10.1109/77.783519.

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20

HERVÉ, A. "CONSTRUCTING A 4-TESLA LARGE THIN SOLENOID AT THE LIMIT OF WHAT CAN BE SAFELY OPERATED." Modern Physics Letters A 25, no. 20 (June 28, 2010): 1647–66. http://dx.doi.org/10.1142/s0217732310033694.

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The 4-tesla, 6 m free bore CMS solenoid has been successfully tested, operated and mapped at CERN during the autumn of 2006 in a surface hall and fully recommissioned in the underground experimental area in the autumn of 2008. The conceptual design started in 1990, the R&D studies in 1993, and the construction was approved in 1997. At the time the main parameters of this project were considered beyond what was thought possible as, in particular, the total stored magnetic energy reaches 2.6 GJ for a specific magnetic energy density exceeding 11 kJ/kg of cold mass. During this period, the international design and construction team had to make several important technical choices, particularly mechanical ones, to maximize the chances of reaching the nominal induction of 4 T. These design choices are explained and critically reviewed in the light of what is presently known to determine if better solutions would be possible today for constructing a new large high-field thin solenoid for a future detector magnet.

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21

Zimoglyad, A., A. Guda, N. Kalinina, V. Balakin, and H. Larionov. "Design and analysis of circuit technique of inverter converter for induction heating." Modern Problems of Metalurgy, no. 25 (April 8, 2022): 17–34. http://dx.doi.org/10.34185/1991-7848.2022.01.02.

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For a research laboratory, the versatility and flexibility of equipment is usually one of the most important criteria. For these reasons, the task was to develop and manufacture a prototype of a laboratory inverter, capable to drive powerfull laboratory devices, like an induction heather, magnetic stress device, and so on. Among the required power leved, the wide frequency operationg range and durability are the inavoidable requirements. The article describes the schematics and design of a laboratory inverter designed for induction heating and melting. The inverter can be easily integrated into the equipment of laboratory installations (for example, intended to melt of metal in a vacuum post). It can also be used autonomously to harden and melt small samples of metals and alloys, including the color metals. The inverter power inverter is adjustable from 0 to 2 kWt, the operating frequency range from 50 kHz to 200 kHz, power supply from 220 V. A half-bridge topology was chosen as the core of the inverter construction. Was developed an undervoltage protection unit, overheat protection, a control circuit on a separate board, a voltage generator were assembled, and water cooling to the copper tubes of the oscillatory circuit was assembled. To test the efficiency of the inverter and the possibility of its operation on the load in the form of a circuit of the induction heater through the pump transformer, a series of experiments on metal heating was performed. To achieve this resuls, metal sample was placed inside the inductor coil, and the frequency was lowered from 200 kHz to 140 kHz. The power consumption from the network reached 1.5 kW. During these tests, no essentail overheating of the electornic componets was detected. The inverter has proved its efficiency during numerios tests. Due to the protection against overcurrent, overheating, low supply voltage in the control circuit, it is well suited for laboratory research on melting and heating of metal. The usage of modern element base, together with circuit solutions, allowed us to achieve the necessary parameters in terms of efficiency, operating frequency range and power.

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22

Xie, Yun Cheng, and Qin Zhang. "The Perspective of Ecological Building Large Sports Venues Green Regulation System." Advanced Materials Research 726-731 (August 2013): 3608–12. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.3608.

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In sports ecological perspective, adopting the literature material method, expert interview and logical induction, for large sports venues green construction and current situation of the development and utilization of system analysis and research, on this basis building a large sports venues and green sustainable development mode. The results of the study conclude that the large size stadium design, construction, operation as an ecological system was studied. In every link of fusion, through green, save and sustainable development thought. Using this model will be good for large sports venues construction and sustainable utilization.

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23

Ganah, Abdulkadir A., and Godfaurd A. John. "BIM and project planning integration for on-site safety induction." Journal of Engineering, Design and Technology 15, no. 03 (June 5, 2017): 341–54. http://dx.doi.org/10.1108/jedt-02-2016-0012.

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Purpose The section of the research presented in this paper aims to review and explore health and safety (H&S) issues on construction sites. It has the sole intention of using better computer visualisation to meet the needs of site practitioners in understanding such H&S problems. Design/methodology/approach The methodology follows a traditional literature review approach to understand the development of building information modelling (BIM) technology up to its current status. A questionnaire survey was conducted to gather information on the embedding of H&S planning by site practitioners within the BIM environment. Findings BIM has the potential to be used in H&S planning procedures, particularly in those related to tasks on construction sites. A framework for an integrated visual tool is developed for better H&S practice on site. It may be used actively by all practitioners, starting with site induction and addresses, inter alia, personal hazard perception. Research limitations/implications This paper provides a foundation for developing a tool that helps construction personnel explore potential H&S risks on site before construction begins. By introducing a framework for integrating BIM and project planning, a prototype can be developed to demonstrate the application of the proposed framework. Originality/value The research presented in this paper introduces BIM usage during the construction stage as a tool that supports a H&S toolbox. The paper proposes the useful framework for better H&S practice on site that can be used actively by all practitioners. The intention is to find a way forward in addressing “real” H&S site issues that may not be easily understood by practitioners without the full aid of visualisation scenarios.

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Cheng, Ning Zi, Yao Hua Li, Qiong Xuan Ge, Rui Hua Zhang, and Ke Wang. "Research and Design of Network System for LIM Rail Transit Vehicle." Applied Mechanics and Materials 253-255 (December 2012): 2086–90. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.2086.

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The new linear induction motor (LIM) driven urban rail transit system is favored for more rapidly and reliability, cost-effective and environmental friendly. As the core of the LIM vehicle, network system is proposed in this paper. The scheme of network system is given by using Beckhoff programmable logical controller and its sub-modules, and CANopen protocol is applied in network communication. The performance of the network system is demonstrated by the experiment results. The research and design can be a useful guidance to engineering application for future LIM urban rail transit construction in China.

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Matsui, Tetsuya, and Yukio-Pegio Gunji. "Experimental Disproof of a Manga Character Construction Model." Symmetry 13, no. 5 (May 10, 2021): 838. http://dx.doi.org/10.3390/sym13050838.

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In prior works, the impression of elements of virtual agents/manga character and the overall impression of virtual agents/manga character were considered completely symmetric. In this work, we conducted a preliminary experiment to develop a system that creates designs of virtual agents depending on a text. In this experiment, the participants read the text and chose the image of an agent and social group that resembled their mental image. We introduced the lattice derived by the rough set induction method to suggest the model to analyze the mental image. In this model, we constructed the lattice from two interpretations to evaluate the complexity of the mental image generation process. As a result, the lattices derived by social groups and appearance were non-Boolean; however, those derived by two kinds of design features were not non-Boolean. This result shows that the mental appearance and social images cannot be combined voluntarily. This result showed that it is not symmetric between each element of virtual agents/manga character and overall virtual agents/manga character.

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Huang, Wen, Zhendong Yang, Mark D. Kraman, Qingyi Wang, Zihao Ou, Miguel Muñoz Rojo, Ananth Saran Yalamarthy, et al. "Monolithic mtesla-level magnetic induction by self-rolled-up membrane technology." Science Advances 6, no. 3 (January 2020): eaay4508. http://dx.doi.org/10.1126/sciadv.aay4508.

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Monolithic strong magnetic induction at the mtesla to tesla level provides essential functionalities to physical, chemical, and medical systems. Current design options are constrained by existing capabilities in three-dimensional (3D) structure construction, current handling, and magnetic material integration. We report here geometric transformation of large-area and relatively thick (~100 to 250 nm) 2D nanomembranes into multiturn 3D air-core microtubes by a vapor-phase self-rolled-up membrane (S-RuM) nanotechnology, combined with postrolling integration of ferrofluid magnetic materials by capillary force. Hundreds of S-RuM power inductors on sapphire are designed and tested, with maximum operating frequency exceeding 500 MHz. An inductance of 1.24 μH at 10 kHz has been achieved for a single microtube inductor, with corresponding areal and volumetric inductance densities of 3 μH/mm2 and 23 μH/mm3, respectively. The simulated intensity of the magnetic induction reaches tens of mtesla in fabricated devices at 10 MHz.

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27

Mills, Donald L. "Guideway design and construction for Vancouver Advanced Light Rapid Transit." Canadian Journal of Civil Engineering 14, no. 3 (June 1, 1987): 347–62. http://dx.doi.org/10.1139/l87-055.

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The Vancouver Advanced Light Rapid Transit (ALRT) System consists of 21.4 km (13.3 miles) of grade-separated guideway between the cities of Vancouver and New Westminster. Of the total length, 16.6 km (10.3 miles) are elevated, 1.3 km (0.8 miles) are in tunnel, and 3.5 km (2.2 miles) are at grade. There are 15 stations and a maintenance and vehicle storage facility. The system uses linear induction motor driven, light-weight driverless cars which are automatically controlled from the operations center located in the maintenance facility.The guideway beam concept was developed in concrete with the requirement that direct track fixation be used without a second pour. The beams are post-tensioned, following erection into two- and three-span continuous structures, encastre at the internal supports, with single pot bearings at the expansion ends.During construction the management for the project was provided by a joint project organization (JPO) consisting of the system contractor, Metro Canada Ltd., and the owner, B.C. Transit. The JPO was formed part way through the project to reduce duplication of effort and improve communication and coordination.Quality assurance for all materials and construction was critical to the successful completion and operation of the system. To ensure quality, the JPO instituted a detailed quality assurance (QA) and quality control (QC) program, implemented through the construction management team.Production of the precast guideway beams for the project was undertaken by two separate contractors. The initial contractor produced the beams for the 1 km prebuilt or demonstration phase, requiring 74 beams. The second contractor produced the remaining and major portion of the elevated guideway beams, for phase 2, amounting to an additional 1040 beams. Information obtained from phase 1, the prebuilt section, was used to modify the structural design, equipment requirements, and production and construction methods for phase 2.The cost of the transit system including 114 vehicles and all operation and control equipment was budgeted for a maximum expenditure of $854 million of which approximately $240 million was for civil works for the guideway, stations, and maintenance yard.Construction of the guideway began in August 1983 and was completed in December 1985. The guideway began operation January 1, 1986 on time and on budget. Key words: transit, automated, design, construction, guideway precast, concrete, quality assurance.

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Sawetsakulanond, B., and V. Kinnares. "Design, analysis, and construction of a small scale self-excited induction generator for a wind energy application." Energy 35, no. 12 (December 2010): 4975–85. http://dx.doi.org/10.1016/j.energy.2010.08.027.

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Shiho, M., S. Kawasaki, K. Sakamoto, H. Maeda, H. Ishizuka, Y. Watanabe, A. Tokuchi, Y. Yamashita, and S. Nakajima. "Design and construction of an induction linac for a mm wave free electron laser for fusion research." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 341, no. 1-3 (March 1994): 412–16. http://dx.doi.org/10.1016/0168-9002(94)90394-8.

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Koudela, Lukáš, Václav Kotlan, and Ivo Doležel. "Construction improvement of the thermoelastic clutch based on shape optimization." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 2 (March 6, 2017): 489–96. http://dx.doi.org/10.1108/compel-05-2016-0228.

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Purpose The paper aims to deal with shape optimization of a novel thermoelastic clutch working on the principle of induction heating. The clutch consists of a driving part, with a ferromagnetic ring, and a driven part. The driving part rotates in a static field produced by appropriately arranged static permanent magnet. Currents induced in the rotating ferromagnetic ring cause its temperature to rise and increase its internal and external radii. As soon as its external diameter reaches the diameter of head of the driven part, it starts also rotating because of mechanical friction between both parts. Design/methodology/approach Presented is the complete mathematical model of the device, taking into account all relevant nonlinearities (saturation curve of the processed steel material and temperature dependences of its physical parameters). The forward solution is realized by the finite element method, and the shape optimization is solved using heuristic algorithms. Findings The clutch was found to be fully functional and may be used in applications with limited access into the device. Research limitations/implications The coefficient of expansion of material of the driven part must be substantially lower than the same coefficient of the driving part to keep the necessary friction torque. The clutch can be only used in applications where higher temperatures (such as 300°C) are not dangerous to the environment. Practical implications The presented model and methodology of its solution may represent a basis for design of devices for transfer of generally mechanical forces and torques. Originality/value This paper presents an idea of induction-produced thermoelastic connection of two parts capable of transferring mechanical forces and torques.

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Maizana, Dina, Y. Yanawati, and A. Nazifah. "Performance Comparison on 0.35 mm and 0.50 mm Thicknesses of Non-Oriented Steel Sheets Using FEM." Applied Mechanics and Materials 679 (October 2014): 112–17. http://dx.doi.org/10.4028/www.scientific.net/amm.679.112.

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– Decrease the iron loss, total loss and thicknesses of steel sheets will produce high efficiency of the induction motor This paper studies, a rotor construction with different thickness was investigated thoroughly and analyzed in the case of efficiency, torque, all losses and distribution field. All result simulation was done by MotorSolve (IM) which allows the user to produce more design of induction motor with a decision within a short time. According to simulation result, the 0.35 mm showed that a best performance and efficient compared to 0.50 mm thickness of rotor frame.

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Sengamalai, Usha, Geetha Anbazhagan, T. M. Thamizh Thentral, Pradeep Vishnuram, Tahir Khurshaid, and Salah Kamel. "Three Phase Induction Motor Drive: A Systematic Review on Dynamic Modeling, Parameter Estimation, and Control Schemes." Energies 15, no. 21 (November 4, 2022): 8260. http://dx.doi.org/10.3390/en15218260.

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An induction motor is generally used in industrial applications because it is reliable, robust, and low cost. Reliability is one of the essential parameters based on which the motor is selected, and the induction motor primarily comes into force. The well-founded induction motor gives good results under various operating states. To achieve this, the values of the motor are kept in mind. Dynamic simulation plays a significant part in evaluating the model’s design process to eliminate design errors in typical construction types and when testing the motor drive system. The induction motor is modeled in a synchronously revolving rotor flux-oriented frame, which is used as a reference. For sensorless vector control and induction motor control methods, accurate knowledge of a few induction motor parameters is necessary. The presentation of the drive will degrade if the original data in the motor do not match the values utilized in the controller. Various mechanisms have been developed to calculate the online and offline parameters of the induction machine for its application in high-performance drives. The foremost grail of this review paper is to present dynamic modeling and other considerable approaches used for estimating the induction motor parameter. This paper also constitutes some simulation examples related to dynamic modeling and parameter estimation techniques, which may be useful for specialists in the field of electric drive control systems.

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Kalenova, M. Yu, A. V. Dmitrieva, I. V. Kuznetsov, А. М. Koscheev, O. E. Budin, and A. S. Schepin. "PURIFICATION OF CONSTRUCTION MATERIALS OF SPENT FUEL ASSEMBLIES BY COLD CRUCIBLE INDUCTION MELTING." Fine Chemical Technologies 11, no. 6 (December 28, 2016): 83–90. http://dx.doi.org/10.32362/2410-6593-2016-11-6-83-90.

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«New atomic energy technologies» federal program is being realized in Russia. This program includes experimental energy complex development and building, which contains: - a natural safety lead coolant fast reactor «BREST-300»; - a spent fuel recycle facility including fuel fabrication and re-fabrication, radioactive waste immobilization and discarding in accordance with radioactively-equivalent state. The current recycle facility preliminary design involves dry operation of spent fuel elements disassembly using steel shell dissolution by liquid zinc. Fuel element shells are made of special radiation-proof steel «EP-823» containing the following amounts of elements (%): C - 0.2; Мn - 0.8; Si - 1; S - 0.01; Р - 0.015; Сr - 12; Ni - 0.5; Мо - 0.9; V - 0.2; N - 0.05; Fe - 84.325. After dissolution zinc liquid containing steel elements is distilled. Still zinc is sent back to shells dissolution. The bottom product is destructurized particulate with the composition corresponding to original steel. Actinides steel shell and bottom product contamination was predicted using computer modeling. In accordance with the project technical specification actinide content in the disposable materials must be under 0.0001%. Thus, the bottoms product should be purified. Oxidative slag cold crucible induction melting purification was chosen and tested in laboratory scale. The following slag types were investigated: Al2O3-SiO2, B2O3-SiO2, Al2O3 - CaO. It was found that the most appropriate slag is B2O3-SiO2, and the optimal process temperature is about 1600°C.

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Segbenya, Moses, and Esi Yeboah. "Effect of Occupational Health and Safety on Employee Performance in the Ghanaian Construction Sector." Environmental Health Insights 16 (January 2022): 117863022211372. http://dx.doi.org/10.1177/11786302221137222.

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The contribution of the construction sector to the socio-economic development of Ghana cannot be underestimated. However, these benefits are not without challenges such as frequent industrial accidents and diseases leading to the loss of lives of workers and or influencing employee and organisational performance. Construction firms are therefore required to ensure workers’ health and safety at the construction sites. This study therefore explores the influence of occupational health and safety (OHS) on construction workers’ performance in Ghana. This study employed the descriptive research design from the quantitative approach, and a sample of 120 employees was drawn out of 200 workers from the sector. Means, standard deviations and multiple standard regression were used to analyse the data. The study found that OHS policies in the construction sector had a statistically significant effect on employee performance and related well with best international practices. However, the construction sector lacks regular health and safety induction, orientation and refresher courses for construction workers. Hence there were still occupational accidents and diseases affecting workers in the sector. For fear of being sacked, workers hardly report pains and injuries suffered at the construction sites. Also, construction workers felt that the high cost of training could explain why employers were not providing regular refresher training and induction training on OHS in the workplace. The study, therefore, concluded that more efforts were required from the management of construction firms than workers, as opposed to the position of Heinrich Domino’s theory, to ensure occupational safety and health in the sector. It was recommended that the management of construction companies in the sector should prioritise the health and safety of workers over the economic concern with regard to the cost of training.

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Feng, Yue, Mei Qi Liu, Mei Xia Qiao, and Jie Wang. "Based on the Repetitive Controller for Induction Heating Power Supply." Applied Mechanics and Materials 310 (February 2013): 470–76. http://dx.doi.org/10.4028/www.scientific.net/amm.310.470.

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According to the electromagnetic induction heating power supply control system, puts forward a kind of proportion, integral, differential regulator with repetitive controller combined control strategy, in order to improve the heating process of the power supply output quality. Based on this control strategy, gives the repetitive controller each part parameters of the detailed design scheme and proportion, integral and differential controller coefficient; Construction of compensator Q(z) and S(z) , the introduction of zero phase shift Notch function, effectively inhibit PWM-type induction heating power supply output voltage harmonic interference. To carry out the simulation experiment, the results show that the proposed controller can guarantee that the system has better dynamic and static properties, error convergence rate is greatly improved.

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Srivastava, Richa, Anantha-Barathi Muthukrishnan, and Guhan Jayaraman. "Design and Construction of a Synthetic Riboregulator-Based Platform for Metabolic Shunting of Pathways in Lactococcus lactis." Proceedings of the Singapore National Academy of Science 13, no. 01 (December 2019): 17–26. http://dx.doi.org/10.1142/s2591722619400027.

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Microbial cell factories are subjected to rewiring of basic metabolism to enhance the carbon flux towards the desired product pathway. Conventionally, this metabolic engineering approach often involves over-expression of pathway genes and knocking out genes in the competing pathways. However, these approaches result in severe metabolic burden and eventual poor performance of the cells. Particularly, where biomass formation and product synthesis depend on common precursors, permanent changes like knocking out genes will only result in poor titer. Hence, temporary decoupling of biomass formation and product synthesis is considered to be a potential alternative. In this study, we designed synthetic riboregulators, which are RNA-based genetic switches, to shunt metabolic pathways in Lactococcus lactis bacteria, a GRAS organism employed as a cell factory for many biocompounds. The riboregulators are then subjected to evaluation by tagging the cis-repressive sequence (crRNA) to mCherry, a fluorescent reporter and regulated by the constitutive promoter, [Formula: see text]. The trans-activating RNA (taRNA) that interacts with the crRNA is placed under the control of another inducible promoter, [Formula: see text]. First, we observed that when there is no induction of taRNA, there is negligible fluorescence of mCherry indicating the successful repression of translation by the cis-sequence as expected. This has been further verified by comparing this expression level with the expression level of [Formula: see text]-mCherry without the cis-sequence, using fluorometer. Results from this analysis suggest that there is [Formula: see text]% repression by the designed crRNA sequence. Next, we induced the cells with 2[Formula: see text]ng/mL of nisin in the mid-log phase. Upon induction, there is a maximum of three fold increase in the fluorescence levels when compared to the uninduced cells, suggesting that the trans-activation takes place inside the live cells. However, further studies are necessary to optimize the cis-trans ratio to achieve better dynamic range for expression modulation and time window for operating metabolic shunting of competing pathways successfully in L. lactis.

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37

Chen, Jie. "Research on the Design of Graphic Public Welfare Posters based on Semiology." BCP Social Sciences & Humanities 16 (March 26, 2022): 397–403. http://dx.doi.org/10.54691/bcpssh.v16i.494.

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The theory of semiology as basis, first, the denotative meaning of the signifier and the signified generation in the vision of the graphic public welfare posters of natural resource protection were demonstrated and analyzed, as well as the connotative meaning of the ideological level in the dual characteristics, then the symbolic analysis, induction, deconstruction and construction were carried out in accordance with the division of binary composition, dual characteristics and different representation modes of symbolic graphics, and applied them to the actual creative process. In the design process, the extraction and transformation of different types of symbolic elements, such as color, graphics, and materials, isomorphism, symbolism and other creative expression were combined to carry out graphic poster design around the theme of "water resources conservation".

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38

Lopukh, D. B., A. V. Vavilov, A. A. Khoroshev, I. N. Skrigan, and A. P. Martynov. "Experimental and Theoretical Studies of Induction Furnaces with Cold Crucibles and Bottom Heating for Radioactive Waste Vitrification." Radioactive Waste 21, no. 4 (2022): 13–23. http://dx.doi.org/10.25283/2587-9707-2022-4-13-23.

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The paper describes the development of a concept for bottom-heated induction melting in cold crucible (CCIM-BH) applied for radioactive waste vitrification purposes. It presents experimental and theoretical research data that can be used in the design development of industrial high-performance radioactive waste vitrification facilities. The paper provides experimental data involving electrical and energy characteristics of the melters. Based on 2D simulation of electromagnetic and hydrodynamic processes, the study evaluates the distributed parameters of induction systems demonstrating CCIM-BH features and advantages.

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Arlenny and David Setiawan. "Optimization of electrical energy in the fan using fuzzy logic controllers." IOP Conference Series: Earth and Environmental Science 1041, no. 1 (June 1, 2022): 012025. http://dx.doi.org/10.1088/1755-1315/1041/1/012025.

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Abstract Single-phase induction motors are a type of electric machine that are widely used in people’s lives due to it has advantages such as lower prices, simple maintenance and construction. However, the single-phase induction motor also has a weakness, which is difficulty in setting up the rotation. The rotation setting of a single-phase induction motor can be affected by changes in the input frequency and changes in the input voltage. In this study is to design the control of a single-phase induction motor in a commonly used fan. The speed of the single-phase induction motor is regulated based on the number of visitors, using artificial intelligence namely fuzzy logic. The fuzzy logic controller can be group visitors to the room to determine the speed of the fan. The visitors are divided into three groups, namely “many” to indicate the maximum speed, “medium” for medium speed and “few” for low speed. Therefore, this research may contribute as an energy-saving solution using artificial intelligence.

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Yu, Hongxia. "Exploration and Practice of Teaching Mode of Motor Design Course Based on Online and Offline Mixed Mode." International Journal of Education and Humanities 4, no. 2 (August 26, 2022): 1–2. http://dx.doi.org/10.54097/ijeh.v4i2.1442.

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The course of motor design is highly theoretical, and its basic principle is based on the relatively abstract theory of electromagnetic induction, which is a comprehensive subject. Because electromagnetic theory is very abstract and the analysis is complex, students generally think that this subject is difficult to learn and lacks enthusiasm for learning. Through the construction of online and offline resources of this course, the learning effect of students can be greatly promoted, the self-learning ability of students can be enhanced, the learning interest of students can be improved, and the professional ability can be increased.

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Bu, Wenshao, Ziyuan Li, Chunxiao Lu, Xiaohong Wang, and Juanya Xiao. "Research on the least squares support vector machine displacement observer of a bearingless induction motor." Transactions of the Institute of Measurement and Control 39, no. 5 (December 7, 2015): 688–97. http://dx.doi.org/10.1177/0142331215617524.

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To achieve the radial displacement self-sensing detection of a bearingless induction motor, an observation method based on the LS-SVM (least squares support vector machine) is proposed. The state-space model of a magnetic suspension system is derived firstly. Then the LS-SVM is introduced to the radial displacement observer of the bearingless induction motor, the design principle and Lyapunov stability of the LS-SVM displacement observer are analysed in detail, and the construction method of the LS-SVM displacement observer is presented also. Simulation and verification results show that both in the starting suspension stage and in the process of stable suspension operation, the LS-SVM displacement observer can quickly track the radial displacement with high accuracy. Then, a new method is found for the radial displacement self-sensing detection of the bearingless induction motor.

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Re'em, Tali. "Preparation of TGF-beta1/affinity-bound alginate macroporous scaffolds." Chemical Industry 72, no. 2 (2018): 81–90. http://dx.doi.org/10.2298/hemind171204022t.

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Spatio-temporal presentation of growth factors is one of the key attributes of the cell's microenvironment. The design of macroporous alginate scaffolds, wherein TGF-b1 or BMP-4 is electrostatically bound to affinity binding sites of alginate sulfate, mimicking their presentation by the extracellular matrix (ECM), was previously shown to enable sustained presentation and release of each factor, thus increasing their biological activity. Specifically, TGF-b1/affinity-bound scaffolds induced the chondrogenic differentiation of human mesenchymal stem cells (hMSCs) seeded within these scaffolds. The prolonged activity of the affinity-bound TGF-b1 enabled efficient induction of signaling pathways leading to chondrogenesis, up to the appearance of committed chondrocytes. Similarly, BMP-4 affinity-bound to the macroporous alginate scaffold enabled efficient induction of osteogenic differentiation in hMSC constructs. Subsequent construction of a multicompartment inductive system, spatially-presenting TGF-b1 and BMP-4 in two distinct layers, enabled complete differentiation of hMSC to chondrocytes and osteoblasts, depending on the type of factor in use in the respective layer. This paper describes in detail the preparation method of the TGF-b1 or BMP4/affinity-bound alginate scaffolds, and the set of analyses performed to characterize the resultant scaffolds, including release profile study, released factor bioactivity, and functionality of the scaffolds as hMSC-inductive scaffolds.

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43

Skalomenos, Konstantinos A., Masahiro Kurata, Hironari Shimada, and Minehiro Nishiyama. "Use of induction-heating in steel structures: Material properties and novel brace design." Journal of Constructional Steel Research 148 (September 2018): 112–23. http://dx.doi.org/10.1016/j.jcsr.2018.05.016.

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44

Makowski, Krzysztof, and Marcin J. Wilk. "Optimization of a single-phase capacitor induction motor by applying a surrogate field-circuit model." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 6 (October 28, 2014): 1891–903. http://dx.doi.org/10.1108/compel-11-2013-0359.

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Purpose – The purpose of this paper is to present optimization of a single-phase capacitor induction motor with respect to efficiency and starting torque by using surrogate field-circuit model for steady-state. As variables, dimensions of the rotor slots and capacitor capacitance were assumed, whereas outputs were the motor performance characteristics. Searching for a motor design of maximum starting torque or maximum efficiency were objectives of the optimization. To verify design solutions, rated load and locked rotor tests of the optimized motors were performed by computer simulation which confirmed better performance parameters of the optimized motors. Design/methodology/approach – The paper presents optimization procedure of a single-phase capacitor induction motor by applying response surface methodology for surrogate 2D field-circuit model of the motor. For solving the problem a single-objective and bi-objective approach were applied. Findings – The carried out calculations showed that obtained new structures of the capacitor induction motor have better starting properties – the higher ratio of starting to rated torque. It was also obtained the motor construction with higher efficiency and lower stator current at the same time. Originality/value – The main advantage of the formulated optimization procedure was application of the SSO (sequential surrogate optimization) algorithm which exploits a polynomial surrogate model and genetic algorithm to find minimum of the objective functions and also to speed up computations.

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Mazón-Valadez, Cuauhtémoc, Luis Héctor Quintero-Hernández, Ernesto Edgar Mazón-Valadez, Alfonso Hernández-Sámano, José Ávila-Paz, and Mario Eduardo Cano-González. "Developing a self-regulating soldering iron based on induction heating." DYNA 83, no. 196 (April 20, 2016): 159–67. http://dx.doi.org/10.15446/dyna.v83n196.51208.

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<p>This work focused on the design, development and construction of a new low cost soldering iron that works by means of induction heating. The amount of electronic components has been minimized in order to reduce production costs. Additional tests were undertaken to determine the ideal tips for soldering, and the adaptations necessary to guarantee self-regulation using a nickel foil shield (due to its low curie temperature) are suggested. The new device contains a resonant inverter able to generate alternating magnetic fields of 100 kHz at the center of an 18-turn coil; the inverter is controlled only using an astable oscillator circuit. The paper examines criteria to select suitable soldering-tips by experimentally determining their equivalent resistance heating it within the resonant inverter or well, another one by using a rapid magnetic test. The system represents a good tool, suitable for the manufacture of development boards or electronic tasks.</p>

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46

García, Nicolás Toro, Yeison Alberto Garcés Gomez, and Vladimir Henao Cespedes. "Robust control technique in power converter with linear induction motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 1 (March 1, 2022): 340. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp340-347.

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Induction motors are widely used in industrial applications as actuators, thanks to their simplicity of construction, which is subsequently reflected in low-cost maintenance. This paper shows the behavior of a three-phase power converter with a linear induction motor (LIM) as load, using a quasi-sliding control technique for output voltage regulation and a new control technique to control chaos. Digital pulse width modulation (DPWM) techniques are widely used to control electronic power converters. The controller proposed in this paper was designed using zero average dynamic (ZAD) and fixed point inducting control (FPIC) techniques. The ZAD-FPIC control strategy was designed and applied to a three-phase converter with linear induction motor load. Since it is not possible to measure the secondary currents, a secondary current observer was included in the system. Finally, bifurcation diagrams are shown as a technique for tuning controller parameters in ZAD-FPIC controllers. For the illustration of numerical results a simulation of the linear induction motor drive controlled was made by MATLAB/Simulink. The designs were tested in a rapid control prototyping (RCP) system based on digital signal processing (DSP) for dSPACE platform, using the 1103 controller card and control desk interface.

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47

Kruchek, Viktor, and Pavel Dvorkin. "Perspectives of using the titanium alloys for heat stressed parts." Bulletin of scientific research results, no. 1 (March 20, 2016): 66–71. http://dx.doi.org/10.20295/2223-9987-2016-1-66-71.

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Objective: To examine the perspectives of using the titanium alloys for diesel motors design and for development of new construction materials for improvement of reliability and life time of forced diesels. Methods: Metallography and X-ray microanalysis were used for titanium allows examination. Results: It was found, that using of titanium allows for train diesel motor piston design would increase the elasticity of the piston for 8%, and decreases the elongation under high temperatures (up to 700 °С). Practical importance: Using of titanium alloys improves the reliability of piston operation and allows to increase the grade of forced induction, that provides the diesel power increasing.

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48

Wang, You, Ziwei Wang, Tingting Ma, Guowei Li, and Huixia Tie. "Research on the Realization Path of Railway Intelligent Construction Based on System Engineering." Sustainability 14, no. 11 (June 6, 2022): 6945. http://dx.doi.org/10.3390/su14116945.

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The implementation of railway intelligent construction is the need of national strategic development and the demand of society. Based on the idea of system engineering, this paper proposes a three-dimensional railway intelligent construction system architecture composed of a full life cycle, management level and technical support. Based on this architecture, a “three-step” implementation path is proposed. Then, it analyzes the technology support framework required in the architecture based on Building Information Modeling (BIM), incorporating Global Positioning System (GPS) and Geographic Information System (GIS), algorithmic prediction and machine learning technology, Internet of Things (IoT) and artificial intelligence technology, big data and cloud computing technology, and the application of railway intelligent construction system architecture is analyzed by taking a railway tunnel project in Zhejiang Province of China as an example. Finally, it discusses the problems that may be encountered in the implementation of railway intelligent construction and puts forward relevant suggestions. The results show that railway intelligent construction is an essential way. At present, China’s railway intelligent construction is still in the primary stage. The design organization should do a good job in the top-level design and accumulate sufficient data for the later stage. All parties in the middle stage of construction should do a good job in the induction and integration of information and accumulate sufficient experience. In this way, we can integrate into the advanced stage and give full play to the advantages of software and hardware integrated applications such as BIM, IoT, big data, cloud computing and intelligent devices so as to truly realize the intellectualization and modernization of railway construction.

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Bitsi, Konstantina, Sjoerd G. Bosga, and Oskar Wallmark. "Design Aspects and Performance Evaluation of Pole-Phase Changing Induction Machines." Energies 15, no. 19 (September 24, 2022): 7012. http://dx.doi.org/10.3390/en15197012.

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Pole-phase changing induction machines (IMs) offer the capability to extend the torque-speed envelope compared to their fixed pole-phase counterparts. Dynamic pole-changing can achieve higher torque levels at lower speeds, utilizing higher pole numbers, and extended flux-weakening range with lower pole-number operations. This paper investigates the design impact on the optimum pole-phase changing behavior and respective split of the operating region to different pole-phase operations. Additionally, the improvement in terms of the overall torque per ampere capability and efficiency is illustrated. For the purposes of the analysis, two different IMs with wound independently-controlled stator coils (WICSC) and different original pole numbers are evaluated in an effort to quantify the extent of the benefits of pole-phase changing. These geometries correspond to machines that were originally designed with 2- and 6 magnetic poles, respectively. It is shown that, in the case of the original 2-pole WICSC machine, shifting to a higher pole number is notably beneficial in terms of efficiency in a significant part of the operating region, whereas in the original 6-pole, both higher and lower pole numbers significantly enhance the overall torque capability and efficiency. The results highlight the notable benefits of pole-phase changing IMs and offer deep insight towards the derivation of standard design guidelines for these machines.

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Wilson, John W., Liam A. Marsh, Wouter Van Verre, Michael C. Rose, Geoffrey Evatt, Andrew R. D. Smedley, and Anthony J. Peyton. "Design and construction of a bespoke system for the detection of buried, iron-rich meteorites in Antarctica." Antarctic Science 32, no. 1 (January 22, 2020): 58–69. http://dx.doi.org/10.1017/s0954102019000531.

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AbstractIron-rich meteorites are significantly underrepresented in collection statistics from Antarctica. This has led to a hypothesis that there is a sparse layer of iron-rich meteorites hidden below the surface of the ice, thereby explaining the apparent shortfall. As standard Antarctic meteorite collecting techniques rely upon a visual surface search approach, the need has thus arisen to develop a system that can detect iron objects under a few tens of centimetres of ice, where the expected number density is of the order one per square kilometre. To help answer this hypothesis, a large-scale pulse induction metal detector array has been constructed for deployment in Antarctica. The metal detector array is 6 m wide, able to travel at 15 km h-1 and can scan 1 km2 in ~11 hours. This paper details the construction of the metal detector system with respect to design criteria, notably the ruggedization of the system for Antarctic deployment. Some preliminary results from UK and Antarctic testing are presented. We show that the system performs as specified and should reach the pre-agreed target of the detection of a 100 g iron meteorite at 300 mm when deployed in Antarctica.

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