Journal articles: 'Electrical machine calculation'

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Podgornovs, Andrejs, and Antons Sipovichs. "Electromechanical Battery EMB Mass Minimization taking into Account its Electrical Machines Rotor Energy." Electrical, Control and Communication Engineering 7, no. 1 (December 1, 2014): 5–10. http://dx.doi.org/10.1515/ecce-2014-0017.

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Abstract In this paper the electromechanical battery (EMB) with synchronous machine is described. Theoretically, if electrical machines rotor stored energy is known, it is possible to reduce the flywheel mass of electromechanical battery. For example, the efficiency of energy recovery (kilowatt-hours out versus kilowatthours in) in nowadays appliances exceeds 95 % which is considerably better than of any electrochemical battery, such as lead-acid battery. For the rotor stored energy amount calculation, it is necessary to find all geometrical dimensions of the electrical machine. To achieve this goal the iterative calculation method was used. Electromechanical battery mass was analyzed as a discharge process rotation speed function. Taking into account the rotor stored energy, we can increase the minimum rotation speed thus reducing the electrical machine mass and increasing the flywheel mass, which provides EMB cost reduction. Additionally, the possibilities of using numerical approximation calculations of magnetization curves are discussed. Each iteration of numerical application necessary for the method for rapid calculation is essential when calculating the field problems. Nowadays there are a lot of computer added design programs for electromagnetic field calculation in different types of applications, electrical machines and apparatus. For the electromagnetic field calculation process some more commonly used magnetization curve approximation methods are described, and the machine calculation time is tested for different numbers of calculations.

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Froidurot, B., L. L. Rouve, A. Foggia, G. Meunier, and J. P. Bongiraud. "Calculation of electrical machine magnetic stray fields." IEE Proceedings - Science, Measurement and Technology 149, no. 5 (September 1, 2002): 190–93. http://dx.doi.org/10.1049/ip-smt:20020623.

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Hatziathanassiou, V., J. Xypteras, and G. Archontoulakis. "Electrical-thermal coupled calculation of an asynchronous machine." Archiv für Elektrotechnik 77, no. 2 (January 1994): 117–22. http://dx.doi.org/10.1007/bf01578534.

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Jumayev, Sultan, Aleksandar Borisavljevic, Konstantin Boynov, Juha Pyrhönen, and Elena A. Lomonova. "Inductance calculation of high-speed slotless permanent magnet machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 2 (March 2, 2015): 413–27. http://dx.doi.org/10.1108/compel-08-2014-0207.

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Purpose – The purpose of this paper is to give a simple, fast and universal inductance calculation approach of slotless-winding machines and comparison of inductances of toroidal, concentrated and helical-winding machines, since these winding types are widely used among low-power PM machines. Design/methodology/approach – Harmonic modeling approach is applied to model the magnetic field of the windings in order to calculate the synchronous inductances. The method is based on distinction between electromagnetic properties of different regions in the machine where each region is represented by its own governing equation describing the magnetic field. The governing equations are obtained from Maxwell’s equations by introducing vector potential in order to simplify the calculations. Findings – Results of the inductances of toroidal, concentrated and helical-winding slotless PM machines, which have the same torque and dimensions, obtained by the proposed analytical method are in good agreement with 3D FEM, where the relative difference is smaller than 15 percent. However, the calculation time of the analytical method is significantly less than in 3D FEM: seconds vs hours. Additionally, from the results it is concluded that the toroidal-winding machine has the highest inductance and DC resistance values among considered machines. Helical-winding machine has lowest inductance and DC resistance values. Inductance of concentrated-winding machine is between inductance of helical and toroidal windings; however, DC resistance of the concentrated windings is comparable with resistance toroidal windings. Originality/value – In this paper the inductance calculation based on harmonic modeling approach is extended for toroidal and helical-winding machines which makes the method applicable for most of the slotless machine types.

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Ginzarly, Riham, Ghaleb Hoblos, and Nazih Moubayed. "From Modeling to Failure Prognosis of Permanent Magnet Synchronous Machine." Applied Sciences 10, no. 2 (January 19, 2020): 691. http://dx.doi.org/10.3390/app10020691.

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Due to the accelerating pace of environmental concerns and fear of the depletion of conventional sources of energy, researchers are working on finding renewable energy sources of power for different axes of life. The transportation sector has intervened in this field and introduced hybrid electric vehicles. Many complaints have been mentioned concerning fault detection and identification in the vehicle to ensure its safety, reliability and availability. Diagnosis has not been able to overcome all these concerns, and research has shifted toward prognosis, where the manufacturing sector is urged to integrate fault prognosis in the vehicle’s electrical powertrain. In this article, prognosis of the vehicle’s electrical machine is treated using a hidden Markov model after modeling the electrical machine using the finite element method. Permanent magnet machines are preferable in this application. The modeling of the machine is a combination of the electromagnetic, thermal and vibration finite element models. The considered faults are demagnetization, turn-to-turn short circuit and eccentricity. A strategy for the calculation of the remaining useful life (RUL) is suggested when a turn-to-turn short circuit fault occurs.

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Stepanov, Anatoly N., and Irina P. Stepanova. "CALCULATION OF THE EXTERNAL MAGNETIC FIELD OF AN ELECTRICAL MACHINE." Scholarly Notes of Komsomolsk-na-Amure State Technical University 1, no. 10 (June 30, 2012): 31–37. http://dx.doi.org/10.17084/2012.ii-1(10).5.

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KOVALEV, Konstantin. "Methodic of calculation of fully HTS silent-pole electrical machine." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 1 (January 5, 2019): 215–20. http://dx.doi.org/10.15199/48.2019.01.51.

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Patsios, Charalampos, Minos E. Beniakar, Antonios G. Kladas, and John Prousalidis. "A Simple and Efficient Parametric Design Approach for Marine Electrical Machines." Materials Science Forum 792 (August 2014): 367–72. http://dx.doi.org/10.4028/www.scientific.net/msf.792.367.

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In this paper a parametric design procedure of electrical machines used in naval propulsion systems is developed. The algorithm uses a series of design characteristics i.e. the type of the machine, the winding configuration and key geometrical properties, as parameters and is implemented on MATLAB® script allowing for a straightforward incorporation with other development tools. Using the proposed algorithm, two of the most common machine configurations involved in marine electrical propulsion systems i.e. the Induction Motor and the Synchronous Permanent Magnet Motor, are designed and 2D finite element modeling and analysis is performed. MATLAB® is used to interact with the FEMM software package through ActiveX framework, allowing for a detailed calculation of the electromagnetic properties of the machines examined.

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Loginov, Sergei, Yulia Domracheva, Vadim Smirnov, and Dmitriy Fedorov. "Research of Radial Forces and Torque of Bearingless Synchronous Machine." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2015): 128. http://dx.doi.org/10.17770/etr2015vol1.217.

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Bearingless synchronous machine (BSM) is an electrical machine which rotor is suspended by electromagnetic forces (not ball bearings). It allows achieving ultra-high rotation speed and significantly extending area of electric drive application. Nowadays there are different variants of the machines with the structural design and the searching of optimal solution is going on. The basic calculation parameters of bearingless machines are radial forces that can withstand the rotor from external load and torque produced on the shaft. This article describes the theoretical results based on a computer model that produces the finite element method and experimental study of the BSM prototype.

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Rens, Jan, Lode Vandenbossche, and Ophélie Dorez. "Iron Loss Modelling of Electrical Traction Motors for Improved Prediction of Higher Harmonic Losses." World Electric Vehicle Journal 11, no. 1 (March 11, 2020): 24. http://dx.doi.org/10.3390/wevj11010024.

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A Finite Element (FE) modelling approach is presented to account for the core losses in electrical machines that are generated by higher harmonic frequencies, for example those caused by Pulse Width Modulation (PWM) switching or by space harmonics due to the machine geometry. The model builds further on a post-processing calculation tool that was recently developed to take into account the magnetic skin effect in electrical steel laminations at high frequencies, and extends this by a more detailed loss analysis of the minor hysteresis loops that are caused by the higher harmonics. Further, these tools for high-frequency loss analysis are integrated into a complete electrical machine model with separate consideration of the major and minor loops. The modelling approach relies strongly on extensive magnetic measurement data of the electrical steel, in order to accurately predict the different loss components for minor hysteresis loops as a function of the DC bias field, frequency and amplitude of the minor loop. Results from the model are shown for an automotive traction motor, illustrating the losses caused by PWM harmonics and demonstrating the relevance of including the skin effect in these calculations.

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Kłosowski, Zbigniew, and Sławomir Cieślik. "Real-Time Simulation of Power Conversion in Doubly Fed Induction Machine." Energies 13, no. 3 (February 4, 2020): 673. http://dx.doi.org/10.3390/en13030673.

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Currently used methods of simulation of doubly fed induction machines (DFIM), especially in real-time simulators (where a relatively large calculation step is used and high adequacy is required), do not provide the required adequacy, especially in rotor electrical circuits. In order to increase the adequacy of reproducing of electrical processes occurring in the circuits of the wound DFIM rotor, this paper presents a proposal and a verification of a new method of real-time simulation. The new method of mathematical modeling of electrical circuits uses voltage averaging at the calculation step. This method was supplemented by prediction of the machine’s rotor angle, which significantly increases the degree of adequacy of reproducing physical quantities present in DFIM, especially in the machine’s rotor. This method allows real-time simulation of electrical systems with a relatively large calculation step (of the order of 200 µs), while maintaining an appropriate degree of adequacy.

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Nasiri, A. A., B. Abdi, S. M. M. Mirtalaei, and M. I. Ghiasi. "Optimum Speed Calculation for Electrical Machine Optimization in Variable Speed Applications." Research Journal of Applied Sciences, Engineering and Technology 7, no. 5 (February 5, 2014): 897–902. http://dx.doi.org/10.19026/rjaset.7.332.

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von Pfingsten, Georg, Martin Marco Nell, and Kay Hameyer. "Hybrid simulation approaches for induction machine calculation." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 5 (September 3, 2018): 1744–54. http://dx.doi.org/10.1108/compel-01-2018-0015.

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Purpose Induction machines for traction applications are operated at working points of high ferromagnetic saturation. Depending on the working point, a broad spectrum of harmonic frequencies appears in the magnetic flux density of induction machines. Detailed loss analysis therefore requires local and temporal highly resolved nonlinear field computation. This loss analysis can be performed in the post processing of nonlinear transient finite element simulations of the magnetic circuit. However, it takes a large number of transient simulation time steps to build up the rotor flux of the machine. Design/methodology/approach In this paper, hybrid simulation approaches that couple static FEA, transient FEA and analytic formulations to significantly decrease the number of simulation time steps to calculate the magnetic field in steady state are discussed, analyzed and compared. Findings The proposed hybrid simulation approaches drastically decrease the simulation time by shortening the transient build-up of the rotor flux. Depending on the maximum error of the rotor flux linkage amplitude compared to the steady state value, a reduction of simulation time steps in the range of 55.5 to 98 per cent is found. Originality/value The presented hybrid simulation approaches allow efficient performing of the transient FE magnetic field simulations of induction machines operated as traction drives.

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Dietz, Armin, Antonino Oscar Di Tommaso, Fabrizio Marignetti, Rosario Miceli, and Claudio Nevoloso. "Enhanced Flexible Algorithm for the Optimization of Slot Filling Factors in Electrical Machines." Energies 13, no. 5 (February 26, 2020): 1041. http://dx.doi.org/10.3390/en13051041.

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The continuous development in the field of industrial automation and electric mobility has led to the need for more efficient electrical machines with a high power density. The improvement of electrical machines’ slot filling factors is one of the measures to satisfy these requirements. In recent years, this topic has aroused greater interest in the industrial sector, since the evolution of the winding technological manufacturing processes allows an economically sustainable realization of ordered winding arrangements, rather than random ones. Moreover, the manufacture of electrical machines’ windings must be preceded by an accurate design phase in which it is possible to evaluate the maximum slot filling factor obtainable for a given wire shape and for its dimensions. For this purpose, this paper presents an algorithmic approach for the evaluation of maximum slot filling factors in electrical machines under an ideal geometric premise. In particular, this algorithm has a greater degree of flexibility with respect to the algorithm approaches found in the literature, since the study has been extended to round, rectangular and hexagonal wire sections. Furthermore, the slot filling factor calculation was carried out both for standard and non-standard slots. The algorithmic approach proposed can be considered as an additional useful tool for the fast design of electrical machine windings.

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Demeianto, Bobby, Riki Peri Ramadani, Iskandar Musa, and Yuniar Endri Priharanto. "ANALISA PEMBEBANAN PADA GENERATOR LISTRIK KAPAL PENANGKAP IKAN STUDI KASUS PADA KM. MARADONA." Aurelia Journal 2, no. 1 (November 27, 2020): 63. http://dx.doi.org/10.15578/aj.v2i1.9425.

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Efficiency value is a measure that can inform us that a machine that operates can be said to be efficient or not. This study aims to find the efficiency value of the electric generator on the fishing vessel KM. Maradona. In addition, this study also aims to find the average percentage value of electric current on each phase of the generator and also to find the average value of the percentage imbalance of load sharing in three-phase electrical installations in KM. Maradona. From the calculation, it is found that the percentage of imbalance of three-phase electrical installations KM. Maradona when the generator operates can reach 31.11%. From the calculation, it is also found that the average percentage load on the electric generator of KM. Maradona maximum value is 22.35% with an average current value of 25.50 Ampere. Directly proportional to the maximum average current value, the maximum electrical power value of KM. Maradona is only at 16.80 kVA with an efficiency value of 22.40%.

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Nell, Martin, Alexander Kubin, and Kay Hameyer. "Approach for the Model and Parameter Selection for the Calculation of Induction Machines." Energies 14, no. 18 (September 7, 2021): 5623. http://dx.doi.org/10.3390/en14185623.

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The solution of multiphysical problems in the field of electrical machines is a complex task that involves the modeling of a wide variety of coupled physical domains. Different types of models and solution methods can be used to model and solve the individual domains. In this paper a procedure for the methodical selection of the most suitable model for a given multiphysics task is presented. Furthermore, an approach for the selection of the most suitable variable machine parameters for a design optimization is presented. The model selection is presented on the basis of the electromagnetic calculation of an induction machine. For this purpose, models of different value ranges and levels of detail, such as analytical and numerical ones, are considered. The approach of the model selection is explained and applied on the basis of a coupled electromagnetic-thermal simulation of an exemplary induction machine. The results show that the model selection presented here can be used to methodically determine the most suitable model in terms of its value range, level of detail and computational effort for a given multiphysical problem.

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Nasir, Bilal Abdullah. "An Accurate Iron Core Loss Model in Equivalent Circuit of Induction Machines." Journal of Energy 2020 (February 15, 2020): 1–10. http://dx.doi.org/10.1155/2020/7613737.

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Iron core loss is the major loss in electrical machines. It performs up to 25% of total machine losses. The machine efficiency calculation requires an accurate prediction of losses. The accuracy of losses calculation depends largely on the equivalent circuit parameter determination and measurements. In this paper, an accurate procedure of iron core loss determination considering the variation effect of supply voltage, iron core temperature, rotor parameters due to skin effect, and magnetizing saturation. The iron core resistance is performed as main component in the equivalent circuit. This resistance is a function of supply voltage and used to calculate part of stray loss as well as iron core loss. The theoretical model is compared with practical results with high accuracy, which proves the validity of the proposed procedure.

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Volkov, S. V., O. V. Goryachev, A. G. Efromeev, and A. O. Stepochkin. "Calculation of the Parameters of a Mathematical Model of an Electric Hybrid Stepper Motor Based on the Analysis of the Magneto Static Field Pattern." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 8 (August 8, 2019): 482–89. http://dx.doi.org/10.17587/mau.20.482-489.

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The article presents a solution to the problem of calculating the parameters of a mathematical model of an electric hybrid stepper motor based on an analysis of the picture of its magnetostatic field. The main disadvantage of such an engine described. Is the mid-frequency resonance, which occurs due to the coincidence of the natural frequency of the rotor with the frequency of the supply voltage pulses. The necessity of taking this factor into account when designing a discrete electric drive system based on the executive motor of this type by calculating the values of resonant frequencies and using them in developing the drive control algorithm is shown. The task of developing a mathematical model of the engine is formulated, which allows to analyze the influence of its design parameters on the spectrum of resonant frequencies. The method of calculating the parameters of a given mathematical model is formed. The variants of the mathematical description of this electric machine are considered and the selection of its known mathematical model is made based on the equivalent electric circuit. The numerical calculation of the spatial pattern of the magnetostatic field of the electric motor is performed. Based on the analysis of the calculation results, a system of assumptions has been formed to develop an equivalent magnetic circuit of an electrical machine. An equivalent magnetic circuit and the corresponding system of equations has been developed. Formed a system of equations of a mathematical model based on the equivalent circuits of the electric and magnetic circuits.On the basis of the obtained system of equations, a simulation model of a discrete electric drive was developed in the Simulink software package. Using the obtained simulation model, the calculation of transients on the angle of rotation of the rotor and the electromagnetic moment is carried out and the influence of one of the design parameters on the natural frequency of the rotor is analyzed. Based on the simulation results, it is shown that with an increase in the air gap height of a hybrid stepper motor, the resulting electromagnetic moment decreases, and the natural oscillation frequency of the rotor decreases, and the frequency at which medium-frequency resonance occurs also decreases. This mathematical model can be used at the stage of the correct calculation of the selected engine, since allows you to analyze the effect of a specific design parameter of the machine — in particular the size of the air gap on the natural frequency of the rotor, and, consequently, on the spectrum of the resonant frequencies of a discrete electric drive.

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ALWASH, S. R., and J. RIKABI(deceased). "CALCULATION OF MACHINE-SLOT PARAMETERS BY COMPLEMENTARY VARIATIONAL TECHNIQUE." Electric Machines & Power Systems 25, no. 7 (August 1997): 783–95. http://dx.doi.org/10.1080/07313569708955775.

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Shan, Ti Kun. "Mechanical Behavior of the Rubber Blanket Used for Electrical Machine Hanging." Key Engineering Materials 501 (January 2012): 145–50. http://dx.doi.org/10.4028/www.scientific.net/kem.501.145.

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In order to get optimal properties of rubber blanket used for electrical machine hanging, FEM calculation is used to conduct stress distribution of rubber blanket to detect its rubber mechanical behavior, normal temperature static rigidity and compression strength, and detect the relationship of applied load and distortion. Ultimately, the simulative results are verified feasibly and their operating requirements are satisfied.

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Ding, Hong Chang, and Lin Jing Xiao. "The Strength Analysis of Rotor Sleeve and PM for High-Speed Electrical Machine." Advanced Materials Research 338 (September 2011): 477–80. http://dx.doi.org/10.4028/www.scientific.net/amr.338.477.

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For high-speed permanent magnet (PM) electrical machine, the PM material has very small tensile stress, and it can’t withstand the huge centrifugal force. So, a high-strength sleeve with interference fit is necessary to protect the PM. This paper mainly analyzes the strength of rotor sleeve and PM. It deduces the theoretical calculation method of the strength according to Lame equation, and it also analyzes the stress of sleeve and PM by ANSYS Workbench. The result show that the theoretical calculation value is closely to the ANSYS result, and it can meet the requirements of protecting the permanent magnet in high rotation speed.

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Guardado, J. L., and K. J. Cornick. "Calculation of machine winding electrical parameters at high frequencies for switching transient studies." IEEE Transactions on Energy Conversion 11, no. 1 (March 1996): 33–40. http://dx.doi.org/10.1109/60.486573.

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Xu, Song, Hai Feng Wang, and Guo Biao Gu. "An Analytical Model for Leakage Effect in the Electrical Generator of Rim-Driven Marine Current Power System." Advanced Materials Research 860-863 (December 2013): 2244–51. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.2244.

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This paper presents an equivalent magnetic circuit model to predict the leakage effect, especially the end leakage effect, of surface-mounted permanent magnet synchronous machine (SPMSM) in rim-driven marine current power (RMCP) system. The end leakage effect is usually neglected in most conventional permanent magnet (PM) machines. However, it is significant in the electrical generator of RPCM due to the short axial length. The idealized path and analytical expressions of end leakage permeance are given in this paper. Finite Element Method (FEM) 3D/2D and experimental values are presented to validate the proposed analytical model. With no need for the time-consuming FEM-3D calculation, a correction factor base on the analytical mode is proposed to adjust the results (e.g. back-EMF, torque) of conventional design when end leakage is ignored in the calculation. The calculation results and experimental values show that the proposed analytical model is accurate to analyze the leakage effects of SPMSM in RMCP system.

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Adil Kadyrov, Akbope Karsakov, Bakytzhan Donenbayev, and Kyrmyzy Balabekova. "Establishing the Strength Characteristics of the Lifting-Leveling Device Structures of the VPO-3-3000 Machines for the Track Straightening." Communications - Scientific letters of the University of Zilina 22, no. 4 (October 1, 2020): 70–79. http://dx.doi.org/10.26552/com.c.2020.4.70-79.

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This article deals with replacement of the magnetic grippers on the VPO-3-3000 machines with roller grippers. The novelty lies in establishment of dependences characterizing stress and strain in elements of the lifting and straightening devices and in rails during the operation. Reliability of the program for calculating the structural parameters of the lifting and straightening device for the VPO-3-3000 track renewal machine is shown. The developed design of the lifting and straightening device makes it possible to select the rational parameters of technology and the operating mode of the device. This design is recommended for use when developing working bodies for the straightening machines. The article presents calculation of the lifting and straightening device structural elements' strength during operation, in the Ansys WB software package.

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Zhang, Xin Rui, and Li Zhi. "Study on Power Flow Calculation Using PSASP." Applied Mechanics and Materials 672-674 (October 2014): 1081–84. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1081.

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The power flow calculation is a basic electrical calculation which is to study the steady state operation of power system. Its task is to decide the whole system running state according to the given operating conditions and the network structure. The power flow calculation is the basis of the stability calculation and fault analysis of power system. In this paper, through a four machine 11 node example, we shows that the influence of generator node type on power flow calculation.

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MELCESCU, Leonard-Marius. "DESFĂȘURAREA VIRTUALĂ A LUCRĂRILOR DE LABORATOR DE MAȘINI ELECTRICE ÎN MEDIUL DE CALCUL MATLAB -SIMULINK." "ACTUALITĂŢI ŞI PERSPECTIVE ÎN DOMENIUL MAŞINILOR ELECTRICE (ELECTRIC MACHINES, MATERIALS AND DRIVES - PRESENT AND TRENDS)" 2020, no. 1 (February 10, 2021): 1–11. http://dx.doi.org/10.36801/apme.2020.1.12.

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"The paper presents the author's experience in supporting laboratory applications in the Electrical Machines course during the pandemic caused by the SARS-CoV-2 virus, when teaching hours were conducted online, like activities specific to the distance learning. The experiments in the laboratory works are simulated in the MATLAB-Simulink computing environment by using and adapting the existing transformer and electrical machine models in the SimPowerSystem library. The design of numerical applications was made so that the implementation of electrical diagrams is performed by students, given that they have no experience in numerical modeling of electrical machines. Several methods for obtaining the results from numerical experiments are presented, which allow to ensure a balance between the number of data specific to each experiment and the calculation effort required, so that the experiments can be performed in the time allotted to a laboratory work. Paper purpose: Description of practical teaching aspects related to the simulation classical tests of the electrical machines in MATLAB- Simulink, in order to virtualize the laboratory works and to adapt them to on-line distance learning. Elements of originality: 1. Developing models for adjustable circuit elements and instrumentation required for simulation testing of electrical machines in steady-state regime. 2. Development of the more accurate DC electric machines model that considers the magnetic circuit hysteresis. 3. Analysis of the methods of using the simulation schemes for obtaining in a reasonable time the data that allow the representation of the operating characteristics."

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Zhang, Ming Kai, and Jun Fang Ni. "CNC Transformation of X502 Milling Machine." Advanced Materials Research 472-475 (February 2012): 2072–75. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2072.

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NC transformation of milling machine not only reduces the investment cost, but also improves the machining accuracy of machine components and productivity. This paper presents NC transformation of X502 milling machine, the main researches include the mechanical parts of the transformation plan, the calculation and selection of key mechanical components such as reduction gears, ball screws and stepper motors. According to requirements for the machine control system, electrical system is improved, the proper CNC system is also chosen. After transformation, X502 milling machine is promoted greatly and obtains excellent efficiencies and effectiveness in use.

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Dayanika, J., G. Archana, K. Siva Kumar, and N. Pavani. "Early Detection of Cyber Attacks Based on Feature Selection Algorithm." Journal of Computational and Theoretical Nanoscience 17, no. 9 (July 1, 2020): 4648–53. http://dx.doi.org/10.1166/jctn.2020.9293.

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The world is turning out to be progressively digitalized raising security concerns and the urgent requirement for strong and propelled security advancements and systems to battle the expanding complex nature of digital assaults. This paper talks about how machine learning is being utilized in digital security in resistance and offense exercises, remembering conversations for digital assaults focused at machine learning models. In this review, we are proposing a scientific categorization of IDS, which considers information protests to be essential measurements to group and condense IDS Literature based on machine learning and based on profound knowledge. The review explains initially the idea and scientific grade of IDSs. Machine learning calculations are presented at that point for the many time used in IDSs, measurements and presented benchmark datasets. Next, we take the proposed ordered framework as a benchmark in conjunction with the agent writing and explain how to understand key IDS issues with machine learning and profound systems. At long last, difficulties and future advancements are talked about by assessing ongoing agent examines. This paper proposes IDS dependent on highlight determination and bunching calculation utilizing channel and wrapper techniques. Channel and wrapper strategies are named include gathering dependent on direct connection coefficient (FGLCC) calculation and cuttlefish calculation (CFA), separately.

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Tvorić, Stjepan, Miroslav Petrinić, Ante Elez, and Mario Brčić. "STATIC ECCENTRICITY FAULT DETECTION METHOD FOR ELECTRICAL ROTATING MACHINES BASED ON THE MAGNETIC FIELD ANALYSIS IN THE AIR GAP BY MEASURING COILS." Journal of Energy - Energija 69, no. 4 (December 30, 2020): 3–7. http://dx.doi.org/10.37798/202069451.

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Electrical rotating machines have a great economic significance as they enable conversion of energy between mechanical and electrical state. Reliability and operation safety of these machines can be greatly improved by implementation of continuous condition monitoring and supervisory systems. Especially important feature of such systems is the ability of early fault detection. For this reason, several methods for detection and diagnosis of the machine faults have been developed and designed. As fault detection methods can largely differ in the types of detectable faults, machine adoptability and price of the system, a novel method was developed that can be used for cost-effective detection of various faults of electrical machine. Machine fault detection technique presented in this paper is based on the measurement of magnetic field in the air gap. Numerous studies have proven that crucial information about the machine condition can be determined based on measurement and analysis of the magnetic field in the air gap. It has also been confirmed that analysis of the air gap magnetic field can be used to detect, diagnose and recognize various electrical faults in their very early stage. Proposed method of positioning and installation of the measuring coils on ferromagnetic core parts within the air gap region of the machine enables differentiation of various faults. Furthermore, different faults can be detected if measuring coils are placed on the stator teeth then when placed on the rotor side. The paper presents method on how to analyse and process the measured voltages acquired from measuring coils placed within the machine, especially in the case of rotor static eccentricity detection. The methodology is explained by means of finite element method (FEM) calculations and verified by measurements that were performed on the induction machine. FEM calculation model was used to predict measurement coil output of the induction motor for healthy and various faulty states (at different amounts of static eccentricity). These results were then confirmed by measurements performed in the laboratory on the induction traction motor that was specially modified to enable measurements of faulty operation states of the machine. Measurements comprised of several machine fault conditions broken one rotor bar, broken multiple rotor bars, broken rotor end ring and various levels of rotor static eccentricity. Other methods used for faults detection are primarily based on the monitoring of quantities such as current and vibration and their harmonic analysis. This new system is based on the tracing the changes of induced voltage of the measuring coils installed on the stator teeth. Faults can be detected and differentiated based on RMS value of these voltages and the number of voltage spikes of voltage waveform i.e. without the need of harmonic analyses. If these coils are installed on the rotor it is possible to detect the stator winding faults in a similar manner.

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Kato, Katsumi, Shigeru Kato, and Shinya Matsutomo. "Basic Study for Electric Field Calculation by Application of Machine Learning." IEEJ Transactions on Power and Energy 138, no. 4 (2018): 297–302. http://dx.doi.org/10.1541/ieejpes.138.297.

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Breznik, Mitja, Viktor Goričan, Anton Hamler, Selma Čorović, and Damijan Miljavec. "Analysis and identification of influential phenomena on iron losses in embedded permanent magnet synchronous machine." Journal of Electrical Engineering 68, no. 1 (January 1, 2017): 23–30. http://dx.doi.org/10.1515/jee-2017-0003.

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Abstract This paper presents magnetic flux density behaviour in laminated electrical sheets which affects the results and precision of iron losses calculation in imbedded permanent magnet (IPM) machine. Objective of the research was to analyse all the influential phenomena that were identified through iron loss models analysis, finite element method simulations and iron loss measurements. The presence of phenomena such as harmonic content and rotational magnetic fields are confirmed with finite element method analysis of concentrated and distributed winding IPM machine. A significant magnetic flux density ripple in the rotor of concentrated winding IPM machine in comparison to distributed winding IPM machine is revealed and analysed. Behaviour that affects iron loss in the rotor of synchronous machines in the absence of first order harmonic is analysed. The DC level added to alternating magnetic flux density was used in experiment to mimic magnetic behaviour on the rotor of IPM machine and further to calculate iron losses.

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Staszak, Jan. "Determination of slot leakage inductance for three-phase induction motor winding using an analytical method." Archives of Electrical Engineering 62, no. 4 (December 1, 2013): 569–91. http://dx.doi.org/10.2478/aee-2013-0046.

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Abstract The article introduced some expressions for self- and mutual slot leakage inductance of phase windings for the mathematical model of an induction machine in the natural phase coordinate system and for dq0 model and in an arbitrary coordinate frame. Calculation of self- and mutual slot leakage inductance have been performed for threephase double-layer, delta and delta-modified winding connections. Introduced expressions may be useful in the design of windings and in the analysis of dynamic states of AC electrical machines.

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Groschup, Benedikt, Florian Pauli, and Kay Hameyer. "Influence of the Preformed Coil Design on the Thermal Behavior of Electric Traction Machines." Energies 14, no. 4 (February 11, 2021): 959. http://dx.doi.org/10.3390/en14040959.

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Preformed coils are used in electrical machines to improve the copper slot fill factor. A higher utilization of the machine can be realized. The improvement is a result of both, low copper losses due to the increased slot fill factor and an improved heat transition out of the slot. In this study, the influence of these two aspects on the operational improvement of the machine is studied. Detailed simulation models allow a separation of the two effects. A preform wound winding in comparison to a round wire winding is studied. Full machine prototypes as well as motorettes of the two designs are built up. Thermal finite element models of the stator slot are developed and parameterized with the help of motorette microsections. The resulting thermal lumped parameter model is enlarged to represent the entire electric machine. Electromagnetic finite element models for loss calculation and the thermal lumped parameter models are parameterized using test bench measurements. The developed models show very good agreement in comparison to the test bench evaluation. The study indicates that both, the improvements in the heat transition path and the advantages of the reduced losses in the slot contribute to the improved operational range in dependency of the studied operational point.

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Xypteras, J., K. Maras, and D. Spyrelis. "Calculation of the temperature distribution in an asynchronous machine." European Transactions on Electrical Power 5, no. 3 (September 6, 2007): 181–86. http://dx.doi.org/10.1002/etep.4450050306.

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Faiz, Jawad, Mohammadreza Hassanzadeh, and Arash Kiyoumarsi. "Analytical calculation of magnetic field in surface-mounted permanent-magnet machines with air-gap eccentricity." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 2 (March 4, 2019): 893–914. http://dx.doi.org/10.1108/compel-07-2018-0284.

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Purpose This paper aims to present an analytical method, which combines the complex permeance (CP) and the superposition concept, to predict the air-gap magnetic field distribution in surface-mounted permanent-magnet (SMPM) machines with eccentric air-gap. Design/methodology/approach The superposition concept is used twice; first, to predict the magnetic field distribution in slot-less machine with eccentric air-gap, the machine is divided into a number of sections. Then, for each section, an equivalent air-gap length is determined, and the magnetic field distribution is predicted as a concentric machine model. The air-gap field in the slot-less machine with eccentricity can be combined from these concentric models. Second, the superposition concept is used to find the CP under eccentricity fault. At this end, the original machine is divided into a number of sections which may be different from the one for slot-less magnetic field prediction, and for each section, the CP is obtained by equivalent air-gap length of that section. Finally, the air-gap magnetic field distribution is predicted by multiplying the slot-less magnetic field distribution and the obtained CP. Findings The radial and tangential components of the air-gap magnetic flux density are obtained using the proposed method analytically. The finite element analysis is used to validate the proposed method results, showing good agreements with the analytical results. Originality/value This paper addresses the eccentricity fault impact upon the air-gap magnetic field distribution of SMPM machines. This is done by a combined analysis of the complex permeance (CP) method and the superposition concept. This contrasts to previous studies which have instead focused on the subdomain method.

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Wu, Xu Sheng, and Wei Gao. "Research on Stator Winding Leakage Reactance Calculation of Double-Winding AC-DC Generator." Advanced Materials Research 383-390 (November 2011): 6861–67. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6861.

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Double-winding AC-DC Generator are being widely used in self-contained electrical power systems for their obvious virtues. On their stator, two separate windings are distributed, one three-phase winding delivers AC power and the other twelve-phase winding, termed DC windings, are connected to the bridge rectifier to supply DC power. Unlike ordinary three-phase machines, there are four layers winding in each stator slot of the Double-winding AC-DC Generator and the total gap magnetic potential produced by the twelve-phase winding is more complex than 3-phase machines. By analyzing the leakage magnetic flux and the magnetic potential, relevant formulas are derived to calculate the leakage reactance of the machines. All the stator leakage reactance of a realistic Double-winding AC-DC Generator was calculated through the methods presented and the simulation of a sudden shortcut test of the machine was carried out with the parameters calculated. The simulation and test results agree quite well, and show that the formulas presented are correct.

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Lotfi, Abdelhakim, Dániel Marcsa, and Zoltán Horváth. "Modeling the Thermal Behavior of Permanent Magnet Synchronous Motors." International Journal of Engineering and Management Sciences 4, no. 1 (March 3, 2019): 466–77. http://dx.doi.org/10.21791/ijems.2019.1.58.

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The aim of this study is to present a thermal analysis of a permanent magnet synchronous machine based on finite element method. The developed model can be used to predict temperature distribution inside the studied motor during the rated operation. Electromagnetic computation is carried out with the aid of two 2D finite-element (FE) simulations on the cross-section of the PM motor. To analyse the process of heat transfer in an electrical machine, empirical correlations are used to describe the convective heat transfer from the different surfaces of the PM motor. The heat transfer coefficient is determined using dimensionless numbers and Nusselt number. After the loss calculation, the temperatures of the machine are calculated by using 3D finite element method. The results obtained by the model are compared with experimental results from testing the prototype electric motor.

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Pandilov, Zoran, and Vladimir Dukovski. "Analytical Calculation of the Position Loop Gain for Linear Motor CNC Machine Tool." Applied Mechanics and Materials 186 (June 2012): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amm.186.182.

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One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is position loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally position loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the position loop gain Kv. A combined digital-analog model of the 4-th order of the position loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary position loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency  and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. :The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable

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Yang, Yubo, Guopeng Liu, Xiaotong Yang, and Xiuhe Wang. "Analytical Electromagnetic Performance Calculation of Vernier Hybrid Permanent Magnet Machine." IEEE Transactions on Magnetics 54, no. 6 (June 2018): 1–12. http://dx.doi.org/10.1109/tmag.2018.2818069.

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Neugebauer, Reimund, Christian Scheffler, Markus Wabner, and Carsten Zwingenberger. "Advanced calculation of static and dynamic stiffness in mechatronic machine tools." International Journal of Mechatronics and Manufacturing Systems 4, no. 3/4 (2011): 370. http://dx.doi.org/10.1504/ijmms.2011.041478.

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Hvalin, D. I., O. H. Kensytskyi, and K. O. Kobzar. "Simulation of Electromagnetic Field of a Powerful Electrical Machine." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 64, no. 2 (April 9, 2021): 130–42. http://dx.doi.org/10.21122/1029-7448-2021-64-2-130-142.

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With the aid of mathematical and physical simulation the electromagnetic field distributions in the end zone of a powerful turbogenerator has been obtained. On the basis of the comparison of the axial component of the magnetic induction on the surface of the extreme package of the stator core of the large-scale physical and mathematical models with the data of the field experiment, conclusions are drawn about the reliability of the results obtained. The data of the simulation and the field experiment correspond to the same turbogenerator, which makes it possible to evaluate the correctness of the construction of the mathematical model. It is shown that physical modeling makes it possible to evaluate the regularities of the distribution of the electromagnetic field (without obtaining accurate quantitative indicators) and can be used for qualitative comparison of the effectiveness of various design solutions of the end zone of the stator. However, such models have not become widely used, since numerous studies are required to form meaningful and sufficiently detailed conclusions about the parameters and characteristics of the object, the design of the end zone of high-power generators is complex, and the calculation of three-dimensional models is time-consuming and even with modern computer technology is associated with a number of simplifying factors. In mathematical modeling, a sequential logical transition is applied from a simple model of the central part of the machine to a more complex model of the end zone using preliminary results, which makes it possible to obtain data on the distribution of the electromagnetic field in complex areas. With the help of specialized software, a model has been created that is quite flexible in terms of modifying individual components, characterized by accessibility, visibility and unlimited possibilities for experimentation, including predicting situations that have not previously occurred or can give unpredictable results.

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Hoffmann, Jan, Wolf-Rüdiger Canders, and Markus Henke. "Impact of Current Density and Cooling on the Weight Balance of Electrical Propulsion Drives for Aviation." Energies 13, no. 22 (November 23, 2020): 6149. http://dx.doi.org/10.3390/en13226149.

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Through applying an exemplary design study, the dependencies between current density, temperatures, and weight in an electrical drive system for a small range aircraft with conventional electrical fan or propeller drives are evaluated. This study applies a combined numerical (Finite Element Method FEM) and analytical approach to the machine design, calculation of temperatures, and cooling system design (cooler, pumps, piping). A design scenario was defined using start and climb flight in a warm tropical surrounding as the worst load case. The design has to move between two fixed temperature limits: The maximum allowable temperature in the machine insulation and the ambient temperature. The implemented method facilitates a comparatively fast-medium depth design of the drive system. The derived results show, in fact, a minimum of weight at a certain current density, which is one of the key interests for the designers of the electrical machine. The main influences on this minimum are the temperature drops in the machine, the heat transfer to the cooling fluid, the heat transfer to the cooler wall, and the remaining heat rejection to the ambient. Method and results are transferable to other types of airplanes with different ratings.

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Yang, Yubo, Guopeng Liu, Xiaotong Yang, and Xiuhe Wang. "Analytical Performance Calculation of Vernier Hybrid Machine with Subdomain Method." Electric Power Components and Systems 46, no. 16-17 (October 21, 2018): 1883–95. http://dx.doi.org/10.1080/15325008.2018.1525444.

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Kovalev, K., N. Ivanov, S. Zhuravlev, D. Rusanov, G. Kuznetsov, and V. Podguzov. "Calculation, design and test results of 3 kW fully HTS electric machine." Physica C: Superconductivity and its Applications 587 (August 2021): 1353892. http://dx.doi.org/10.1016/j.physc.2021.1353892.

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Gołębiowski, Marek, Lesław Gołębiowski, Andrzej Smoleń, and Damian Mazur. "Direct Consideration of Eddy Current Losses in Laminated Magnetic Cores in Finite Element Method (FEM) Calculations Using the Laplace Transform." Energies 13, no. 5 (March 4, 2020): 1174. http://dx.doi.org/10.3390/en13051174.

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The following article presents a computation procedure that enables us to simulate the dynamic states of electric machines with a laminated magnetic core, with direct consideration of the eddy current losses. The presented approach enables a significant reduction of the simulation process computational complexity. The verification of the obtained data correctness is based on a detailed balance of energy and power in the investigated system. The correctness of the obtained results was also confirmed by comparing them with the results included in norms that describe the losses in laminated sheets. The presented approach is based on expressing the equivalent permeability of transformer metal sheets by using RC or RL circuits. The impedances of these circuits are treated as the transmittance of Infinite Impulse Response filters (IIR) of the Laplace s variable. In this form they are implemented in direct calculations of the dynamics of electric machines based on field-circuital models, using the Finite Element Method (FEM). In this way, we present the method of including eddy current losses in laminated metal circuits of chokes or transformers, during calculations using the finite element method, with the IIR filter in the domain of the variable s of the Laplace transform. Eddy current losses are directly included in the calculation process. Therefore, they have a direct impact on the transient state waveforms. However, the use of the Laplace variable s caused an excessive increase in the number of state variables, and the overall computational efficiency of the presented method is sufficiently low so as to be used in the simulation process of electrical machine dynamic states with a relatively large number of elements in the FE Model.

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Miwa, Masahiko, Koji Tani, Hiroshi Hashimoto, and Takashi Yamada. "High Accuracy Torque Calculation for a Rotating Machine Using Adaptive Meshing." IEEJ Transactions on Industry Applications 123, no. 7 (2003): 790–97. http://dx.doi.org/10.1541/ieejias.123.790.

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Toba, Akio, Toshiharu Watanabe, and Hiroshi Ohsawa. "Fast Calculation Method for Characteristics of Surface Permanent Magnet Vernier Machine." IEEJ Transactions on Industry Applications 123, no. 7 (2003): 798–808. http://dx.doi.org/10.1541/ieejias.123.798.

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Rudyk, Andrey, Volodymyr Chupryna, and Vladislav Rudyk. "Effect of shape formation on the accuracy of grinding ends while compensating for machine tool errors." Eastern-European Journal of Enterprise Technologies 2, no. 1 (110) (April 20, 2021): 90–96. http://dx.doi.org/10.15587/1729-4061.2021.226479.

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There are several general methods for correcting errors related to positioning the machine tool structural units. The task to achieve optimal manufacturing accuracy can be resolved by using a compatible solution to vector equations, a variation of the shape formation function, or applying a matrix of transfer coefficients. However, there is no mutual relationship between various calculation methods for the case of grinding flat surfaces. The methods should be simplified and tested for the elongated shape formation function while considering the links’ dimensions. This paper reports a study into the accuracy of grinding flat surfaces, determining and reducing the share of manufacturing errors. The content of variation matrices and transfer coefficients has been substantiated. The comparison of the orientation angles of the grinding machine headstock relative to the machine tool bed has demonstrated close results from all methods. These angles were taken as machine tool errors. The calculation error does not exceed 1.5 %. The experiments are consistent with the calculations. Different signs of the transfer coefficients in the orientation angles of grinding machine headstocks in the matrix make it possible to mutually compensate for the overall impact. The calculations have shown that the accuracy of the side-end machining is largely affected by a change in the orientation angle in the vertical plane. The effect exerted on the accuracy of individual mated parts by the machine tool structural units has been estimated. The calculations show that the error of positioning a part in the drum window acquires the highest absolute values and is random in nature, which requires a more accurate base positioning. The findings from both theoretical and experimental studies have been applied. The mathematical model makes it possible to determine the degree of scattering the end surface around the base plane via its variance. The measured trajectory provides diagnostic information about the sources of error in the machine tool assembly. A task to calculate the accuracy of the end-grinding machine tool can be solved for other models of machine tools in the same way

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Telford, D., M. W. Dunnigan *, and B. W. Williams. "Estimation of induction machine inverse rotor time constant using torque angle tangent calculation." International Journal of Electronics 91, no. 6 (June 2004): 319–43. http://dx.doi.org/10.1080/00207210412331286530.

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Miwa, M., D. Dibben, and T. Yamada. "High Accuracy Torque Calculation for a Rotating Machine Using Adaptive Meshing." IEEE Transactions on Magnetics 40, no. 2 (March 2004): 1001–4. http://dx.doi.org/10.1109/tmag.2004.824613.

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Journal articles on the topic 'Electrical machine calculation'

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