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Добірка наукової літератури з теми "STATIC ROTOR RESISTANCE CONTROL"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "STATIC ROTOR RESISTANCE CONTROL"

1

Kolychev, S., and А. Sianov. "EXPERIMENTAL STUDY OF STATIC CHARACTERISTICS ASYNCHRONOUS MACHINE IN DYNAMIC BRAKING MODE WITH INDUCTION RESISTANCE IN THE ROTOR WINDING." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (September 8, 2021): 68–74. http://dx.doi.org/10.31319/2519-2884.38.2021.8.

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Анотація:
The article discusses the results of a study of the static electromechanical characteristics of an asynchronous machine (AM) when prototypes of induction resistances (IR) with improved parameters are included in its rotor circuits. The dynamic braking (DB) of asynchronous machines, which is widespread in practice, provides for the dissipation of the kinetic energy of the rotating parts in the resistance boxes included in the rotor winding. In the process of stopping, to maintain a constant average braking torque AM, a bulky relay-contactor circuit for shunting rotor resistances is used. However, it is not possible to eliminate significant fluctuations in the electromagnetic torque in this way. To optimize the DB AM process, it is proposed to include a three-phase IR in the rotor winding instead of resistance boxes, the value of which automatically decreases along with the rotor current frequency. This approach allows you to abandon contact equipment and ensure smooth braking of the machine with fluctuations in the electromagnetic moment in narrower limits. The known IR designs are designed for starting modes of induction motors with a wound rotor, but they cannot ensure the constancy of the torque on the AM shaft in the DB mode. Therefore, the purpose of the study is to develop and experimentally confirm the effectiveness of simple control circuits of an induction machine in the specified mode with improved contactless induction rheostats in the rotor. The paper presents a diagram of a pilot plant and a figure explaining the design features of the IR. The studies were carried out for an asynchronous machine of the MTB-412-8 type, equipped with a thyristor exciter and a tachogenerator. The three phases of the AM rotor included ICs connected by a "star". The experiments were carried out in the direction of obtaining the necessary braking characteristics of the AM by varying the switching circuit of the stator phases and the value of the current supplying them. The figures show the mechanical characteristics of AM, obtained in the process of studying the influence on them of three typical circuits for switching on the phases of the stator winding and two values ​​of the fixed supply current. The research results show that the desired form of the mentioned AM characteristics is achieved only when using the stator phase switching in a function of the rotor speed and a constant supply current value.
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2

Ameen, Hilmi F. "Computer simulation and mathematical modelling of static rotor resistance chopper control of WRIM by reference frame theory." Procedia Computer Science 3 (2011): 1009–17. http://dx.doi.org/10.1016/j.procs.2010.12.166.

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3

Nazarov, A. N. "Motor driving force of bridge-type crane lifting mechanism under real operating use." Russian Automobile and Highway Industry Journal 20, no. 1 (March 15, 2023): 34–50. http://dx.doi.org/10.26518/2071-7296-2023-20-1-34-50.

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Анотація:
Introduction. The requirement for modelling the dynamic processes of a hoisting mechanism in real operating situations has been revealed. The necessity of increasing the accuracy of moving effort description for the most common types of crane hoist drive control has been determined.Materials and Methods. The operation of a single-speed electric motor with squirrel-cage rotor without speed control, with a phase rotor and additional resistors in the rotor winding and with a squirrel-cage rotor and control by a frequency converter has been considered. The static characteristic of the electric motor is taken as the initial function. The Clauss formula with the corresponding values of the parameters synchronous speed, critical force and critical slip was used to take into account the driving force of the motor for frequency control and for relay-contactor control and a motor with a phase-rotor and additional resistances in the rotor circuit.Results. The dependences for the motor driving force with the most common methods of speed control of the crane hoisting mechanism drive are presented. In the case of the frequency control system, the form of the motor driving force is given in the case of steady-state motion and in the case of transient starting/braking processes when the corresponding algorithms are implemented by a frequency converter. Experimental and theoretical graphs of the load lifting processes for the cases of lifting with pickup in the relay-contactor control system and with elastic pickup in the frequency control system are given.Conclusion. The conclusion about applicability of static mechanical characteristic for description of electric motor operation in crane drives is given. The presented dependences provide an opportunity to model the full working cycle of the hoisting mechanism. The dependences are valid both during steady motion of the mechanism and during transients. It is concluded about the use of the dynamic model taking into account the presented form of the motor driving force for practical purposes for the analysis of the crane operation with regard to the effect of the lifting capacity limiter.
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4

Nicola, Marcel, Claudiu-Ionel Nicola, Dan Selișteanu, and Cosmin Ionete. "Control of PMSM Based on Switched Systems and Field-Oriented Control Strategy." Automation 3, no. 4 (December 10, 2022): 646–73. http://dx.doi.org/10.3390/automation3040033.

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Анотація:
Starting from the problem of studying the parametric robustness in the case of the control of a permanent magnet-synchronous motor (PMSM), although robust control systems correspond entirely to this problem, due to the complexity of the algorithms of the robust type, in this article the use of switched systems theory is proposed as a study option, given the fact that these types of systems are suitable both for the study of systems with variable structure and for systems with significant parametric variation under conditions of lower complexity of the control algorithms. The study begins by linearizing a PMSM model at a static operating point and continues with a systematic presentation of the basic elements and concepts concerning the stability of switched systems by applying these concepts to the control system of a PMSM based on the field-oriented control (FOC) strategy, which usually changes the value of its parameters during operation (stator resistance Rs, stator inductances Ld and Lq, but also combined inertia of PMSM rotor and load J). The numerical simulations performed in Simulink validate the fact that, for parametric variations of the PMSM structure, the PMSM control switched systems preserve qualitative performance in terms of its control. A series of Matlab programs are presented based on the YALMIP toolbox to obtain Pi matrices, by solving Lyapunov–Metzler type inequalities, and using dwell time to demonstrate stability, as well as the qualitative study of the performance of PMSM control switched systems by presenting in phase plane and state space analysis of the evolution of state vectors: ω PMSM rotor speed, iq current, and id current.
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5

Gazizova, Olga. "Group Regulation of Excitation Systems of Factory Synchronous Generators When Entering Separate Work with the Power System in Order to Increase Stability." Известия высших учебных заведений. Электромеханика 65, no. 1 (2022): 82–89. http://dx.doi.org/10.17213/0136-3360-2022-1-82-89.

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Анотація:
One of the most severe resistance theory for factory power plants is the exit to separate work. The stability of generators during the separation from the power system can be increased by group regulation of excitation sys-tems. An algorithm has been developed providing for a faster mutual reynchronization of generators by adjusting forced EMFs on the difference between the rotor speed and the speed of the rotating field of the stator. After synchronization, an automatic excitation control is adjusted to equalize the eigen angles of generators rotors to ensure static stability. Next, conditions are created to resynchronize the electro-station with the power system. The algorithm is designed for factory synchronous generators when leaving for separate work. It is based on a mathematical model of a power plant in Matlab medium, which is calculated for the simplest power plant. The developed algorithm will increase the efficiency of managing emergency regimes of factory power plants during the separation from the power system.
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6

Abdullah Nasir, Bilal. "An accurate dynamical model of induction generator utilized in wind energy systems." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 3 (September 1, 2022): 1185. http://dx.doi.org/10.11591/ijeecs.v27.i3.pp1185-1198.

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Анотація:
Due to the advantages of a self-excited induction generator (SEIG), it plays a main role in sources of renewable energy, such as wind turbines (WT). The regulation of terminal voltage and frequency is poor under variable rotor speed and load conditions at stand-alone operation mode. The generator terminal voltage depends on the excitation capacitance which can be controlled by a capacitor bank and static voltage compensator. The dynamical model of the machine is described by differential equations in D-Q axes transformations of the synchronously rotating frame. Many models of analysis are proposed in the literature. In those models, several approximations are used to simplify the process of calculations, such as neglecting the iron core resistance, stray load resistance, stator and rotor leakage reactance, and magnetic saturation. In this work, a comprehensive dynamic model of the SEIG-WT is performed to analyze the system performance under transient and steady-state conditions. This dynamic model considers the effect of all machine parameters variation. New analytical formulas are used for to accurate calculation of minimum and maximum values of excitation capacitance and generator rotor cut-off and maximum speed. The dynamic model results are partially compared with experimental results, and accurate agreement is shown.
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7

Goh, K. B., M. W. Dunnigan, and B. W. Williams. "Application of Robust Chattering-Reduction Sliding Mode Control Techniques for Position Control of a Vector-Controlled Induction Machine with Non-Linear Friction Dynamics." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 219, no. 8 (December 1, 2005): 577–90. http://dx.doi.org/10.1243/095965105x33635.

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Анотація:
Sliding mode control (SMC) methods possess several advantageous properties such as robustness against parameter variation, disturbance rejection, straightforward design, and are simple to implement. In this paper, a sliding mode control algorithm (which considers the non-linear friction dynamics) based on an equivalent control technique is designed and implemented on a non-linear induction machine system with non-linear friction dynamics such as Coulomb, windage, Stribeck, and static friction. The chattering phenomenon, which is inherent in the standard sliding mode algorithm, is discussed, as well as the techniques to reduce the chattering effect. A sixth-order non-linear induction machine model is employed for simulation analysis. The developed control algorithms are then tested for position control of a practical vector-controlled induction machine, in three different operating conditions (nominal load, high inertial load, and rotor resistance mismatch). The controller performance results are compared practically with several different sliding mode control algorithms as well as with a fixed-gain controller test.
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8

Gao, Hanying, Guoqiang Zhang, Wenxue Wang, and Xuechen Liu. "Research on an Improved Sliding Mode Sensorless Six-Phase PMSM Control Strategy Based on ESO." Electronics 10, no. 11 (May 28, 2021): 1292. http://dx.doi.org/10.3390/electronics10111292.

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Анотація:
The six-phase motor control system has low torque ripple, low harmonic content, and high reliability; therefore, it is suitable for electric vehicles, aerospace, and other applications requiring high power output and reliability. This study presents a superior sensorless control system for a six-phase permanent magnet synchronous motor (PMSM). The mathematical model of a PMSM in a stationary coordinate system is presented. The information of motor speed and position is obtained by using a sliding mode observer (SMO). As torque ripple and harmonic components affect the back electromotive force (BEMF) estimated value through the traditional SMO, the function of the frequency-variable tracker of the stator current (FVTSC) is used instead of the traditional switching function. By improving the SMO method, the BEMF is estimated independently, and its precision is maintained under startup or variable-speed states. In order to improve the estimation accuracy and resistance ability of the observer, the rotor position error was taken as the disturbance term, and the third-order extended state observer (ESO) was constructed to estimate the rotational speed and rotor position through the motor mechanical motion equation. Finally, the effectiveness of the method is verified by simulation and experiment results. The proposed control strategy can effectively improve the dynamic and static performance of PMSM.
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9

Klyuyev, O., O. Sadovoi, and Y. Sokhina. "RESEARCH SENSITIVITY OF THE ROTOR FLUX LINKAGE OBSERVER TO CHANGE PARAMETERS OF THE ASYNCHRONOUS MACHINE." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (September 8, 2021): 57–67. http://dx.doi.org/10.31319/2519-2884.38.2021.7.

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Анотація:
When changing the parameters of the control object to ensure the required quality of control, the tuning parameters of the control system must be changed. Investigation of the sensitivity of mathematical models helps to choose the right technical parameters of the regulators. Therefore, there is an urgent scientific task, which consists in the development of mathematical models for calculating the steady-state values ​​of the sensitivity functions of the coordinates of non-linear systems to changes in their parameters. When synthesizing observers of the rotor flux linkage, it is indicated that the signal for evaluating the rotor flux linkage is most sensitive to a change in the active resistance of the rotor of an induction machine. However, the numerical values ​​of the transmission coefficients between the coordinates of the observer and the increments of the parameters of the asynchronous machine during its operation are not given, which does not allow a comparative analysis of the degree of influence of changes in certain parameters of the asynchronous machine on the signals of the observer of the flux linkage. The task is to find and compare the numerical values ​​of the functions of the sensitivity of the coordinates of the observer of the rotor flux linkage to the change in the parameters of the asynchronous machine by joint analytical solution of the static equations of the observer's sensitivity model and the state model of the asynchronous machine. In this work, analytical expressions are obtained for the steady-state values ​​of the sensitivity functions of the coordinates of such a nonlinear object as an observer of the rotor flux linkage to a change in the parameters of an asynchronous machine. A comparative analysis of the values ​​of the transmission coefficients between the parameters and coordinates in the system asynchronous machine — observer of the rotor flux linkage for its various rotation speeds is carried out. The proposed technique makes it possible to find the numerical values ​​of the transmission coefficients and to compare the degree of influence of various parameters of the asynchronous machine on the coordinates of the flux linkage observer. Transient processes obtained in the course of solving the equations of the dynamics of an asynchronous electric drive with an observer of flux linkage complement the results of analytical calculations. The performed calculations are aimed at increasing the depth of analysis of the properties of the flux link observer, which helps to reasonably choose the structure of feedbacks when synthesizing a closed observer.
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10

Wang, De Shun, Bo Yang, and Lian Tao Ji. "Research and Develop on Static Frequency Converter of Pumped Storage Power Plant." Advanced Materials Research 608-609 (December 2012): 1120–26. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.1120.

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Анотація:
A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.
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Дисертації з теми "STATIC ROTOR RESISTANCE CONTROL"

1

Smiai, Mohamed Salah. "Speed control of wound-rotor induction motor using thyristors to control rotor external resistance." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253409.

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2

Burnham, David James. "Control of wind turbine output power via a variable rotor resistance." Thesis, [Austin, Tex. : University of Texas, 2009. http://hdl.handle.net/2152/ETD-UT-2009-05-105.

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3

BELMONTE, DARIO. "MODEL BASED CORRELATION METHODS FOR FAULTS DETECTION AND IDENTIFICATION ALGORITHMS ON ELECTROMECHANICAL ACTUATORS USED IN PRIMARY FLIGHT CONTROL SYSTEMSMODEL BASED CORRELATION METHODS FOR FAULTS DETECTION AND IDENTIFICATION ALGORITHMS ON ELECTROMECHANICAL ACTUATORS USED IN PRIMARY FLIGHT CONTROL SYSTEMS." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2746072.

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4

Li, Tianya. "Electromechanical wave propagation phenomenon and its control implications in power systems." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/95962/1/Tianya_Li_Thesis.pdf.

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Анотація:
This thesis investigates advanced control methods and strategies to enhance the transient stability of a power system which is affected by the electromechanical wave propagation phenomenon. The characteristics of the travelling wave phenomenon and its impact on system separation during first swing are investigated in detail. This thesis identifies four innovative control implications for power system stability and proposes an improved method to enhance power system transient stability. By designing better control of existing equipment, this research achieves increased maximum power transfer under contingencies in a cost efficient and readily implemented way.
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5

YADAV, ASHUTOSH. "STATIC ROTOR RESISTANCE CONTROL OF INDUCTION MOTOR." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15301.

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Анотація:
this thesis the hardware prototype for static rotor resistance control is developed. Speed of the three phase wound rotor induction motor is controlled by varying the rotor resistance. The variation of rotor resistance is done by controlling the MOSFET using pulse width modulation (PWM). The switching action of MOSFET is controlled by the arduino microcontroller. The switching gate pulse is generated by the arduino microcontroller, which controls the duty ratio of MOSFET switch. The duty ratio of switch varies the rotor resistance and controls the wound rotor induction motor speed. PSIM9.1.1 is used for the simulation purpose and validates the results in open loop as well as closed loop control of three phase induction motor.
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6

ZHENG, HONG-LIANG, and 鄭宏良. "Starting control of a wound-rotor induction motor by chopper controlled resistance in the rotor circuit." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/01124884219304233095.

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7

Chang, Ren-Jye, and 張仁杰. "Nonlinear adaptive sensorless speed control for induction motors considering rotor resistance variation." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/96270017087503668651.

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Анотація:
碩士
國立臺灣大學
電機工程學系
85
In this thesis, a nonlinear adaptive sensorless speed controller for inductionmotors is proposed. In the controller, only the stator currents are assumed tobe measurable. Flux observers and rotor speed estimator are designed to relaxthe need of flux and speed measurement. Besides, an estimator is also designedto overcome drifting problem of the rotor resistance. Rigorous stability analysisbased on Lyapunov theory is also performed to guarantee that the controllerdesigned here is stable. Computer simulations and experiments are done to demonstrate the performance of our design.
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8

Chen, Jenn-Yih, and 陳進益. "Passivity-Based Position Control and Rotor Resistance Estimation for an Induction Motor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/72324371792739352569.

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Анотація:
博士
國立臺灣科技大學
電機工程系
90
This dissertation presents passivity-based adaptive control and sliding mode control schemes for the position control of an induction motor. First, the mathematical model of the induction motor in the synchronously rotating reference frame is derived from the three-phase circuit via the coordinate transformation. There is no need to design a rotor flux observer when the electrical parameters of the induction motor are known. The dynamics of the induction motor and the position controllers are analyzed to be passive by the passivity theorem. Furthermore, one can also design a rotor resistance observer and a sliding mode controller to estimate the rotor resistance and control the position of the induction motor. First, the input-output linearization theory is employed to decouple the rotor position and the flux amplitude in the rotor reference frame. Then, a flux observer is adopted to estimate the rotor flux. The passive properties of the rotor resistance observer with the flux observer and the sliding mode position controller are analyzed by the passivity theorem. The stability analysis of the overall position control system is carried out by using the passivity theorem instead of Lyapunov-type arguments. Finally, the C language is used to implement the proposed control algorithm on a PC-based controller, and applied to a three-phase induction motor for the position control purpose. Experimental results are provided to show good position response and fast convergent speed of the estimated parameters for the composite adaptive controller. The proposed sliding mode position controller with an adaptive law is valid for eliminating the chattering effects associated with a conventional sliding mode position controller. When the rotor resistance is varied with the temperature, the proposed rotor resistance observer with a sliding mode controller are effective in estimating the rotor resistance, load torque disturbances and tracking the rotor position.
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9

Wang, Yen-Kai, and 王衍凱. "EKF-based rotor and stator resistance estimation in speed sensorless control of IMs." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/25853837561782475094.

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Анотація:
碩士
國立臺灣科技大學
機械工程系
98
The system parameters of induction motor(IM) vary with different operating conditions. The temperature-dependent variation of the stator and rotor resistance, which induces a large estimation error on speed and flux, has been a critical issue for speed-sensorless control. On speed-sensorless control, the observer is as important as the controller. The noise immunity and real time estimation ability of Extended Kalman filter(EKF)-based observer lead to a popular application in the field of speed-sensorless control. However, the simultaneous estimation of stator and rotor resistance based on EKF in speed-sensorless control of IMs has not been done to the best of author's knowledge. A novel EKF-based estimation method is proposed for simultaneous estimation of stator and rotor resistance. The simultaneous estimation is achieved by an augmented state for the stator temperature dynamics. The broken-bar phenomenon of rotor can also be detected in the case we studied. Simulation results display promising robustness to variation of system parameters.
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10

Lee, An-Ming, and 李安明. "Nonlinear Adaptive Speed and Torque Servo Control of Induction Motors with Unknown Rotor Resistance." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/93541907705286384032.

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Анотація:
碩士
國立臺灣大學
電機工程研究所
84
In this thesis, we propose a nonlinear adaptive speed and torque controller of induction motors with unknown rotor resistance and build a voltage-driven induction motor driver. All the system parameters except rotor resistance are assumed to be known and only the stator currents and rotor speed are assumed to be available. The desired speed and torque should be any continuously differentiable bounded function. A complete proof of the global stability without singularity is given and the output error will converge to zero asymptotically. Finally, the simulation and experimental results will be given to demonstrate the effectiveness.
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Частини книг з теми "STATIC ROTOR RESISTANCE CONTROL"

1

Kenné, Godpromesse, Tarek Ahmed-Ali, Françoise Lamnabhi-Lagarrigue, and Amir Arzandé. "Real-time Implementation of Rotor Flux and Speed Control of Induction Motors using Online Rotor Resistance and Load Torque Adaptation." In Taming Heterogeneity and Complexity of Embedded Control, 341–61. Newport Beach, CA USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9780470612217.ch20.

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2

Zahraoui, Yassine, Mohamed Akherraz, Chaymae Fahassa, and Sara Elbadaoui. "Robust Control of Induction Motor Drive Facing a Large Scale Rotor Resistance Variation." In Innovations in Smart Cities Applications Edition 3, 736–49. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37629-1_53.

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3

Misra, Priya, and Bhavnesh Kumar. "Rotor Resistance Estimation for Improved Performance of MRAS-Based Sensorless Speed Estimation of Induction Motor Drives." In Intelligent Algorithms for Analysis and Control of Dynamical Systems, 177–87. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8045-1_18.

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4

Loi, Doan Huy, S. H. S. Jayakody, and Kyoji Sassa. "Teaching Tool “Undrained Dynamic Loading Ring Shear Testing with Video”." In Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022, 325–59. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18471-0_25.

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Анотація:
AbstractUndrained dynamic-loading ring-shear apparatus (UDRA) is most appropriate to study landslide dynamics by simulating the entire process from the initial stage of stress before landslide occurrence and stress changes due to static, dynamic loading or pore pressure changes or other types of stress loading to the formation of a sliding surface and the steady-state shear resistance. This paper describes the mechanical structure of the apparatus of UDRA and provides a manual for readers to begin using the UDRA. Specific steps for testing procedures with video tutorials and data analysis are also provided in this paper. The paper concludes with a manual from start to finish for common ring shear tests: undrained monotonic shear stress control test, undrained cyclic loading test, undrained seismic loading test, and pore pressure control test.
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5

Tofail, Syed A. M. "A Dynamically Degradable Surface: Can We ‘Fool’ Bacteria to Delay Biofouling in Urinary Stents?" In Urinary Stents, 187–95. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04484-7_16.

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Анотація:
AbstractHuman body has evolved multiple strategies such as the development of a complex immune system and procurement of commensal microorganisms to deal with detrimental invasion by microbes. Despite this, biofilms pose an extremely difficult mechanism for humans to cope with infections caused by both pathogenic and opportunistically pathogenic microorganisms. Biofilms on urinary stents can lead to patient-discomfort, urinary tract infection and bacteriuria, antimicrobial resistance, stent fouling (encrustation) and obstruction. Currently, biofilm prevention and treatment in ureteral stents are carried out using a ‘static’ coating of the stent with heparin or a pH control-buffer. They increase patency but still becomes colonised by bacteria leading to biofilms. In this chapter we outline a patent-pending first-principle design strategy for a stent-coating stents that has the potential of increasing the patency by manifold and, at will. This strategy involves delaying biofouling with a ‘dynamically degradable surface’ and will be described in this chapter.
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6

Agrebi Zorgani, Youssef, Soufien Hajji, Yessine Koubaa, and Mohamed Boussak. "Model Reference Adaptive System Scheme for Sensorless Induction Motor Drive." In Induction Motors - Recent Advances, New Perspectives and Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1001160.

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Анотація:
Indirect flux-oriented control (FOC) techniques are now widely used for the control of induction motor drives in highperformance applications. For the stator-flux-oriented control (SFOC) induction motor drive, the rotor position – using an incremental optical or magnetic encoder sensor placed on the shaft – and information of the current’s components are continuously required. However, the rotor position sensor leads to reduced reliability and requires additional cabling and space on the shaft. It also increases cost, weight and susceptibility to noise. To overcome these problems, the use of sensorless control without a mechanical sensor is an attractive solution. In previous works , the MRAS scheme has been used to estimate the speed and the rotor resistance. This control method is presented for the sensorless indirect stator-flux-oriented control (ISFOC) induction motor (IM) drive.
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Тези доповідей конференцій з теми "STATIC ROTOR RESISTANCE CONTROL"

1

K, Saran Prasad, Balachander K, and Amudha A. "Matlab/Simulink Study and Implementation of Static Rotor Resistance Control of Wound Rotor Induction Motor." In 2023 7th International Conference on Computing Methodologies and Communication (ICCMC). IEEE, 2023. http://dx.doi.org/10.1109/iccmc56507.2023.10084299.

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2

San Andrés, Luis, Michael Rohmer, and Scott Wilkinson. "Static Load Performance of a Water Lubricated Hydrostatic Thrust Bearing." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63385.

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In rotating equipment, thrust bearings aid to balance axial loads and control shaft position. In turbomachinery, axial loads depend on shaft speed and pressure rise/drop on the impellers. This paper details a water lubricated test rig for measurement of the performance of hydrostatic thrust bearings (HTBs). The rig contains two water lubricated HTBs (105 mm outer diameter), one is the test bearing and the other a slave bearing. Both bearings face the outer side of thrust collars of a rotor. The paper shows measurements of HTB axial clearance, flow rate, and recess pressure for operation with increasing static load (max. 1.4 bar) and supply pressure (max. 4.14 bar) at a rotor speed of 3 krpm (12 m/s OD speed). Severe angular misalignment, static and dynamic, of the bearing surface against its collar persisted and affected all measurements. The HTB axial clearance increases as the supply pressure increases and decreases quickly as the applied load increases. The reduction in clearance increases the flow resistance across the film lands thus reducing the through flow rate with an increase in recess pressure. In addition, an estimated bearing axial stiffness increases as the operating clearance decreases and as the supply pressure increases. Predictions from a bulk flow model qualitatively agree with the measurements. Alas they are not accurate enough. The differences likely stem from the inordinate tilts (static and dynamic) as well as the flow condition. The test HTB operates in a flow regime that spans from laminar to incipient turbulent. Quantification of misalignment at all operating conditions is presently a routine practice during operation of the test rig.
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3

Clemen, Layne, and Alex Beckerman. "Modeling Thermal Effects in DC-Motors Using Pseudo-Bond Graphs." In ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3258.

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Abstract Motor selection is important in all mechatronic systems. This requires understanding how motor performance degrades as a function of system temperature. In this paper, bond graphs are used to develop two simple motor models that captures this performance degradation, specifically by modeling the changes in system resistance and the motor constant as a function of system temperature. In the first system, the entire motor is assumed to be one thermal mass while in the second, the rotor and stator are modeled as two thermal masses separated by an air gap. The calculation of system temperatures allow for relevant system parameters to be represented more accurately over long periods of operation. Either model is readily integrated into models of larger mechatronic systems, a task made more simple through the use of bond graphs. The results presented in this paper will help future engineers to appropriately size motors for mechatronic systems based on such considerations as steady state temperature response, low versus high load conditions, and ambient operating conditions.
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4

Kim, Tae Ho, Jangwon Lee, Chang Ho Kim, and Yong-Bok Lee. "Rotordynamic Performance of an Oil-Free Turbocharger Supported on Gas Foil Bearings: Effects of an Assembly Radial Clearance." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23243.

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Oil-free turbochargers (TCs) will increase power and efficiency of internal combustion (IC) engines, sparking ignition (SI) and compression ignition (CI), without engine oil lubricant feeding and scheduled maintenance. Implementing gas foil bearings (GFBs) into passenger vehicle TCs enables compact, light weight, oil-free systems along with accurate shaft motions, while engine oil lubricated TCs with floating ring bearings (FRBs) are prone to show severe sub synchronous motions over a wide range of shaft speeds due to instability. The paper presents static load-deflection tests of TC GFB structure, and rotordynamic performance measurements of an oil-free TC unit supported on test GFBs. Three metal shims inserted under the bump-strip layers and in contact with the bearing housing create a mechanical preload, which induces a hydrodynamic wedge in the assembly radial clearance to generate more film pressure for the shimmed GFB. Static load-deflection tests estimate the assembly radial clearances of the shimmed GFB smaller than that of the original GFB. Model predictions agree well with test data. The discrepancy between the model predictions and test data is attributed to fabrication inaccuracy of the top foil and bump strip layers. The rotordynamic TC test rig is driven by pressurized air. The test TC rotor, of 335 gram weight and 117 mm length, is coated using commercially available wear-resistant solid lubricant, Amorphous M, to prevent severe wears during start up and shutdown in the absence of an air film. Pressure sensors measure the driving turbine inlet air pressure and a control valve changes the air mass flow manually. A pairs of optical proximity probes positioned orthogonally at the compressor end record the lateral rotor motions. Rotordynamic test results show that the shimmed GFB attenuates significantly the large amplitude of subsynchronous whirl motions arising for the original GFBs. Mechanical preloads, which determine the assembly radial clearance of the shimmed GFB, causes the increase in the rotor-bearing system natural frequency.
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5

Herran, Mathieu, Marc Dijoud, and Christophe Colette. "Technological Choices for Vibratory Robustness of Turbine Bladed Disk." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-04281.

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Abstract Robustness of gas turbine, turbojet or turboprop components with respect to vibratory stress is a guarantee of the success of developments made on time and in service reliability objectives achievement. Currently, it is proposed to achieve the required robustness by components geometry optimization to reduce their mechanical stress levels. It may also be possible to improve the endurance limits of the materials. These optimizations and choices, consumers in time and complexity of manufacture, may be necessary when the required robustness is not found to be achieved during the engine verification. By taking the effects of potential uncertainties and dispersions into account earlier in the development process, technological choices may be more likely to achieve the desired robustness requirement. This paper investigates several simple technological choices to control and reduce the vibratory levels present on the rotors of helicopter turboshaft engines. These technological choices are major choices in the engine architecture with or without additional parts to increase mechanical resistance margins. Gas turbine architecture has a direct impact on the level of excitations and vibratory appropriations, particularly the choice of rotor-stator blade numbers or technologies and shapes of links between rotors. Additional parts allow to increase the vibratory margins on the scale of the component. In this category, the benefit of dampers and intentional mistuning will be recalled. Particular attention will be paid to the relative weight between these technological choices in comparison with the mistuning effect on dynamic levels. Technological choices will be quantified and illustrated by mechanical and statistical analysis and experimental industrial examples.
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6

Ploskikh, Viktor, and Konstantin Bulychenkov. "Building a Bulletproof System for Automatic MWD Survey Processing." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210385-ms.

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Abstract This paper introduces an approach for automatic measurement while drilling (MWD) survey processing that can work fully autonomously and covers the entire workflow: geomagnetic reference calculation, survey data prefiltration, corrections for drillstring interference (DSI), bottom hole assembly (BHA) sag, Stockhausen effect (Stockhausen and Lesso 2003), system health monitoring, survey quality control (QC), and toolcode proposal. The main focus of this study is to formulate principles to realize high reliability of the system, and the reliability of all subalgorithms must be close to 100% to reach the system autonomy requirement. This article highlights four major cornerstones for building such a system: Initialization data validation Static and continuous survey filtration Robustness of the key algorithms QC of output data and system operation. The cornerstones are implemented as follows: Formalization of data schemes and algorithms for internal validation and cross-validation Development of highly robust survey filtration algorithms that are resistant to noise: prefiltration multistation analysis (MSA) algorithm, dogleg severity (DLS) capacity filter, and continuous inclination DLS filter Improvement of accuracy and robustness for MSA, BHA sag, and Stockhausen effect corrections: the calculation of the geomagnetic reference along the trajectory, novel MSA with a priori and steering control information utilization, input smoothing for BHA sag correction, and continuous static survey fusion steady against continuous inclination errors New dynamic acceptance criteria for the total G, total B, and dip angle based on an MWD error model; novel steering acceptance criteria for inclination and azimuth; internal control system for MSA correction, BHA sag correction, and high-definition trajectory calculation; general external control for output trajectory vs. plan; and toolcode assignment based on full covariance analysis Consequently, the automatic system demonstrates complete stability to the noisy data streams of static surveys, continuous inclinations, rotor/slide intervals, capability to work without the no-go zone restriction, correct work within high direction and inclination (D&I) and DSI error ranges, the effective detection of geomagnetic reference issues and system malfunctions, and realistic toolcode assignment. The system significantly reduces human engagement in real-time survey QC and correction. An expert is only involved in case of an issue (D&I module failure, strong external magnetic interference, etc.).
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7

Burnham, D. J., S. Santoso, and E. Muljadi. "Variable rotor-resistance control of wind turbine generators." In Energy Society General Meeting (PES). IEEE, 2009. http://dx.doi.org/10.1109/pes.2009.5275637.

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8

Hou, Yongqiang, Wei Huang, Hao Zhou, Feng Gu, Yanchun Chang, and Yuqing He. "Analysis on Wind Resistance Index of Multi-rotor UAV." In 2019 Chinese Control And Decision Conference (CCDC). IEEE, 2019. http://dx.doi.org/10.1109/ccdc.2019.8832752.

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9

Zhao, Jianhui, and Zhong Wu. "Rotor resistance estimator design for indirect field-oriented induction motors." In Sixth International Symposium on Instrumentation and Control Technology: Sensors, Automatic Measurement, Control, and Computer Simulation, edited by Jiancheng Fang and Zhongyu Wang. SPIE, 2006. http://dx.doi.org/10.1117/12.718226.

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10

Bozhko, S., S. Kovbasa, Y. Nikonenko, and S. Peresada. "Direct vector control of induction motors based on rotor resistance-invariant rotor flux observer." In 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC). IEEE, 2018. http://dx.doi.org/10.1109/esars-itec.2018.8607640.

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