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Simulation analyzing of torque-ripple minimization for switched reluctance motor

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Journal of Harbin Institute of Technology(New Series) 2001年第1期8卷 52-55页

作者：王旭东王喜莲刘玉成 Harbin Univ. of Sci. Harbin 150040 China

Discusses the inevitability of torque ripple of switched reluctance motor (SRM) for its double saliency construction and switch power supply, and the minimization of torque ripple, under traditional current chopping control mode, and presents a varying current amplitude chopping control method with a linear control model of varying current amplitude chopping shown, and the simulation of torque profiles under two kinds of current chopping control modes to demonstrate the validity of decreasing torque ripple.

关键词： switched reluctance motor torque ripple current chopping

A Stator Current Vector Orientation Based Multi-objective Integrative Suppressions of Flexible Load Vibration and torque ripple for PMSM Considering Electrical Loss

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CES Transactions on Electrical Machines and Systems 2020年第3期4卷 161-171页

作者： Yang Yu Leyao Cong Xia Tian Zengqiang Mi Yang Li Zhen Fan Hui Fan North China Electric Power University School of Electrical Engineering Northeast Electric Power University Lehigh University

To store energy from the grid into spiral torsion spring(STS)smoothly and efficiently via PMSM,a multi-objective control problem of flexible load’s vibration,PMSM’s torque ripple,and electrical loss is raised,where the current studies on vibration and torque ripple are mostly addressed separately,not to mention electrical loss.This research attempts to propose a multi-objective integrative control scenario that can simultaneously solve these problems satisfactorily in a unitary nonlinear control framework.Firstly,a dynamic mathematical model of PMSM is built under stator current vector orientation,and then the model of PMSM is combined with the vibration model of STS to establish the overall system model of STS driven by PMSM with considering motor’s electrical loss.Then,a backstepping control principle-based multi-objective integrative control approach is proposed to realize the suppression of flexible load’s vibration and the reduction of PMSM’s torque ripple and electrical loss concurrently.Meanwhile,this research also designs a wide range speed identification method based on the least square algorithm with a forgetting factor.Simulation and experimental results have verified that the proposed integrative control method enables the state variables to track their respective references quickly and accurately,both torque ripple and load vibration are effectively suppressed,and the operating efficiency of the whole system is improved.

关键词： PMSM Vibration torque ripple Electrical loss Backstepping control

Novel torque ripple minimization algorithm for direct torque control of induction motor drive

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Journal of Shanghai University(English Edition) 2009年第2期13卷 155-163页

作者：龙波郭桂芳郝晓红李晓宁 School of Mechatronics Engineering University of Electronics Science and Technology of ChinaChengdu 610054P.R.China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049P.R.China

To elucidate the principles of notable torque and flux ripple during the steady state of the conventional direct torque control （DTC） of induction machines, the factors of influence torque variation are examined. A new torque ripple minimization algorithm is proposed. The novel method eradicated the torque ripple by imposing the required stator voltage vector in each control cycle. The M and T axial components of the stator voltage are accomplished by measuring the stator flux error and the expected incremental value of the torque at every sampling time. The maximum angle rotation allowed is obtained. Experimental results showed that the proposed method combined with the space vector pulse width modulation （SVPWM） could be implemented in most existing digital drive controllers, offering high performance in both steady and transient states of the induction drives at full speed range. The result of the present work implies that torque fluctuation could be eliminated by imposing proper stator voltage, and the proposed scheme could not only maintain constant switching frequency for the inverter, but also solve the heating problem and current harmonics in traditional induction motor drives.

关键词： torque ripple direct torque control （DTC） induction motor （IM） current harmonics

Research on torque ripple Under Healthy and Open-Circuit Fault-Tolerant Conditions in a PM Multiphase Machine

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CES Transactions on Electrical Machines and Systems 2020年第4期4卷 349-359页

作者： Ali Akay Paul Lefley University of Leicester LeicesterUK

In this paper,research into torque ripple production has been undertaken for both the healthy and open-circuit faulttolerant conditions of a five-phase permanent magnet(PM)machine by using the instantaneous power(I-Power)approach.When only the fundamental component of the phase currents is applied to the phase windings,it has been shown that the 9th and 11th harmonics of the back-electromotive force(back-EMF)causes torque ripples in a five-phase PM machine and its frequency is ten times the frequency of the fundamental phase currents.When the combined fundamental and third harmonic components of the phase currents are applied to the phase windings,it has been shown that the 7th and 13th harmonic of the back-electromotive force(back-EMF)causes additional torque ripples in a five-phase PM machine.These torque ripples under fault-tolerant conditions have been analyzed analytically,as well.It has been proven that there are interactions between the fundamental component of current and the third harmonic component of the back-EMF and vice versa.These interactions cause torque ripples.A finite element analysis(FEA)model of the five-phase PM machine has been done to validate the analytical results.

关键词： Five-phase harmonic current injection multiphase machine permanent magnet machine torque ripple

A wide-angle wave control method of reducing torque ripple for brushless DC motor

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Journal of Shanghai University(English Edition) 2007年第3期11卷 300-303页

作者：吴春华陈国呈孙承波 Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 P. R. China

In order to deal with torque pulsation problem caused by traditional control method for brushless DC （BLDC） motor and to achieve high precision and good stability, a novel control strategy is proposed. Compared with the traditional control scheme, by using phase voltage as a control objective and making waveform of phase current approximately quasi-sinusoidal, torque ripple of BLDC motor is reduced from the original 14% to 3.4%, while toque is increased by 3.8%. Furthermore, by detecting zero-crossings of back electromotive force （BEMF） with non-conducting phases, sensorless control is realized. The new control strategy is simple. It can minimize torque ripple, increase torque, and realize sensorless control for BLDC motor. Simulation and experiments show good performance of BLDC motor by using the new control method.

关键词： wide-angle wave control BLDC motor torque ripple sensorless

An Analytic Method of Segmented PWM Duty Cycle for Switched Reluctance Motor

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CES Transactions on Electrical Machines and Systems 2023年第2期7卷 163-170页

作者： Chaozhi Huang Yuliang Wu Hongwei Yuan Wensheng Cao Yongmin Geng CES the School of Electrical and Automation Jiangxi University of Science and TechnologyGanzhou341000China

In view of the large current peak and torque ripple in the actual current chopping control of switched reluctance motor,a segmented PWM duty cycle analysis method of switched reluctance motor based on current chopping control is proposed in this paper.The method realizes the control of the winding current by adjusting the average voltage of the two ends of the winding in one cycle through the PWM duty cycle.At the same time,according to the inductance linear model,the conduction phase is divided into a small inductance region and an inductance rising region,and the analytical formulas of PWM duty cycle in the two regions are deduced respectively.Finally,through matlab/simulink simulation and motor platform experiment,the current chopping control is compared with the segmented PWM duty cycle analysis method in this paper.Simulation and experimental results show that the segmented PWM duty cycle analysis method can effectively reduce the current peak and torque ripple,and has high practical application value.

关键词： Switched Reluctance Motor Current Chopping Control PWM Duty Cycle Current Peak torque ripple

Design and Optimization of Interior Permanent Magnet(IPM)Motor for Electric Vehicle Applications

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CES Transactions on Electrical Machines and Systems 2023年第2期7卷 202-209页

作者： Lavanya Balasubramanian Nurul Azim Bhuiyan Asad Javied Ashraf A.Fahmy Fawzi Belblidia Johann Sienz the Advanced Sustainable Manufacturing Technologies(ASTUTE 2020)operation Swansea UniversityUK the Department of Electrical Power and Machines Helwan UniversityHelwan 11795Egypt

This paper explores some design parameters of an interior permanent magnet synchronous motor that contribute to enhancing motor performance.Various geometry parameters such as magnet dimension,machine diameter,stator teeth height,and number of poles are analyzed to compare overall torque,power,and torque ripples in order to select the best design parameters and their ranges.Pyleecan,an open-source software,is used to design and optimize the motor for electric vehicle applications.Following optimization with Non-dominated Sorting Genetic Algorithm(NSGA-Ⅱ),two designs A and B were obtained for two objective functions and the corresponding torque ripples values of the design A and B were later reduced by 32%and 77%.Additionally,the impact of different magnet grades on the output performances is analyzed.

关键词： Electric vehicles IPM motor Magnet grade Optimization Permanent magnet motor torque ripple

Permanent Magnet Assisted Synchronous Reluctance Motor with Asymmetric Rotor for High torque Performance

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CES Transactions on Electrical Machines and Systems 2023年第2期7卷 179-186页

作者： Chengwu Diao Wenliang Zhao Yan Liu Xiuhe Wang the School of Electrical Engineering Shandong UniversityJinan250061China IEEE the China Aviation Control System Research Institute Wuxi214000China

Permanent magnet assisted synchronous reluctance motor(PMA-SynRM)is a kind of high torque density energy conversion device widely used in modern industry.In this paper,based on the basic topology of PMA-SynRM,a novel PMA-SynRM of asymmetric rotor with position-biased magnet is proposed.The asymmetric rotor design with position-biased magnet realizes the concentration of magnetic field lines in the motor air gap to obtain higher electromagnetic torque,and makes both of magnetic and reluctance torque obtain the peak value at the same current phase angle.The asymmetric rotor configuration is theoretically illustrated by space vector diagram,and the feasibility of high torque performance of the motor is verified.Through the finite element simulation,the effect of the side barrier on output torque and the Mises stress under the rotor asymmetrical design are analyzed.Then the motor characteristics including airgap flux density,back EMF,magnetic torque,reluctance torque,torque ripple,losses,and efficiency are calculated for both the basic and proposed PMA-SynRMs.The results show that the proposed PMA-SynRM has higher torque and efficiency than the basic topology.Moreover,the torque ripple of the proposed PMA-SynRM is reduced by the method with harmonic current injection,and the torque characteristics in the whole current cycle are analyzed.Finally,the endurance to avoid PM demagnetization is confirmed based on the PM remanence calculation.

关键词： Permanent magnet assisted synchronous reluctance motor Asymmetric rotor Magnetic torque Reluctance torque torque ripple

Permanent Magnet Axial Section Shaping Optimization Surface-mounted Permanent Magnet Synchronous Motor

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CES Transactions on Electrical Machines and Systems 2023年第4期7卷 366-371页

作者： Shengnan Wu Qifeng Zhao Wenming Tong the School of Electrical Engineering Shenyang University of TechnologyShengyang 110870China IEEE

In this paper, a new type of harmonic injection permanent magnet shape optimization method is proposed to suppress the torque ripple of surface-mounted permanent magnet synchronous motor. The sinusoidal waveform shaping of the axial section of the permanent magnet is added with the third harmonic shaping, and the sine wave and the third harmonic are derived. The optimal ratio is 6:1. The permanent magnet no shaping, sinusoidal shaping and sinusoidal combined third harmonic shaping are compared. The results show that the sinusoidal combined third harmonic shaping design can effectively suppress the torque ripple of the surface mounted permanent magnet synchronous motor and obtain a relatively large output torque. At the same time, a method of using permanent magnet segmentation to approximately equivalently replace sine combined with third harmonic shaping design is proposed, which effectively saves the manufacturing cost of permanent magnets and provides design and research ideas for more economical and effective optimization of surface-mounted permanent magnet motors.

关键词： Permanent Magnet Synchronous Motor Harmonic Injection torque ripple Segmented Magnet