抢先看 | CES TEMS 2021年第4期目次及摘要

中国电工技术学会活动专区

CES Conference

CES TEMS

《中国电工技术学会电机与系统学报（英文）》(CES TEMS)是中国电工技术学会和中国科学院电工研究所共同主办、IEEE PELS学会技术支持的英文学术期刊。期刊发表国内外有关高性能电机系统、电机驱动、电力电子、可再生能源系统、电气化交通等研发及应用领域中原创、前沿学术论文。中国工程院院士马伟明担任主编，IEEE的执委Don Tan博士为国际主编。

 Message from Editors

Deputy Editor-in-Chief:  Professor Ronghai Qu

Guest Editors: Shoudao Huang, Jianxin Shen, Fengge Zhang, Xiuhe Wang, Metin Aydin, Xiaoyong Zhu, Yongxiang Xu, Zhuoran Zhang, Gaolin Wang, Pinjia Zhang, Hong Li, Dawei Li

Square-Wave Drive for Synchronous Reluctance Machine and its Torque Ripple Analysis

Authors: Jian-Xin Shen, Shun Cai, Dong-Min Miao, Dan Shi, Jacek Gieras, Yun-Chong Wang

Abstract—Synchronous reluctance machine (SynRM) can be perceived as a special type of permanent magnet synchronous machine (PMSM), and shares similar control method, i.e. the sine-wave current drive with sinusoidal phase currents. In this paper, square-wave drive, which is employed for permanent magnet brushless (BLDC) motors, is employed for the SynRM, in order to economically reduce the cost of rotor position sensor. It is revealed that the torque density and efficiency are slightly sacrificed, whereas torque ripple is deteriorated, proving the SynRM with square-wave drive still promising for the cost-sensitive application if torque ripple is not considered as a critical issue. To further investigate the additional pulsating torque under square-wave drive, mathematical model based on a-b-c phase inductance and d-q axis inductance are established, together with the time-stepping FE calculated currents. It is concluded that the harmonics in the currents tend to cause non-sinusoidal variation of the magnetic reluctance, which can be represented as additional inductance harmonics. The harmonics of the current and inductance interact with each other, thus undesirable torque ripple components are produced.

Permanent Magnet Shape Optimization Method for PMSM Air Gap Flux Density Harmonics Reduction

Authors: Chengsi Liu, Yongxiang Xu, Jibin Zou, Guodong Yu, Liang Zhuo

Abstract—This paper proposed a permanent magnet optimization method to suppress the air gap flux density harmonic of permanent magnet synchronous motor (PMSM). The method corrected the effective air gap length of the motor, calculated the magnetization length of the permanent in the case of parallel magnetization, and took the influence of the permanent magnet relative permeability into consideration. Based on these works, for a given sinusoidal air gap flux density waveform, the corresponding structural parameters can be calculated, so as to achieve the optimization of the permanent magnet. By using this method to optimize the shape of the magnet, the fundamental wave of the air gap flux density can be retained to the greatest extent, so as to eliminate harmonics and maintain the output capacity at the same time. The feasibility and accuracy of the method have been verified by finite element analysis (FEA) and prototype machine experiment. This method is simple and time-saving, and has a satisfactory accuracy, which provides a reference method for permanent magnet optimization of PMSM.

Reduction of Cogging Torque and Electromagnetic Vibration Based on Different Combination of Pole Arc Coefficient for Interior Permanent Magnet Synchronous Machine

Authors: Feng Liu, Xiuhe Wang, Zezhi Xing, Aiguo Yu, Changbin Li

Abstract—Cogging torque and electromagnetic vibration are two important factors for evaluating permanent magnet synchronous machine (PMSM) and are key issues that must be considered and resolved in the design and manufacture of high-performance PMSM for electric vehicles. A fast and accurate magnetic field calculation model for interior permanent magnet synchronous machine (IPMSM) is proposed in this article. Based on the traditional magnetic potential permeance method, the stator cogging effect and complex boundary conditions of the IPMSM can be fully considered in this model, so as to realize the rapid calculation of equivalent magnetomotive force (MMF), air gap permeance, and other key electromagnetic properties. In this article, a 6-pole 36-slot IPMSM is taken as an example to establish its equivalent solution model, thereby the cogging torque is accurately calculated. And the validity of this model is verified by a variety of different magnetic pole structures, pole slot combinations machines, and prototype experiments. In addition, the improvement measure of the machine with different combination of pole arc coefficient is also studied based on this model. Cogging torque and electromagnetic vibration can be effectively weakened. Combined with the finite element model and multi-physics coupling model, the electromagnetic characteristics and vibration performance of this machine are comprehensively compared and analyzed. The analysis results have well verified its effectiveness. It can be extended to other structures or types of PMSM and has very important practical value and research significance.

Derivation of Optimal Rotor Topologies for Consequent-Pole PMSM by ON/OFF Method

Authors: Zhen Sun, Kota Watanebe, Xiaozhuo Xu

Abstract—Consequent-pole permanent magnet synchronous machines (CP-PMSMs) have attracted considerable interest as a means of reducing manufacturing costs through a marked reduction in the volume of permanent magnet required to meet a particular torque specification. In this paper, novel rotor topologies for a CP-PMSM are derived to unlock the full design space potential. The ON/OFF method is introduced to manage the laminated steel material distribution over the rotor region, high average torque and low torque ripple are the objects of rotor design, and the immune algorithm is used to search for the optimal material distribution for the formulated problem. More than 9000 different rotor topologies are created and evaluated within 12 hours by this methodology. The optimal topologies under different design strategy are presented, and performance of these topologies are analyzed. The analysis results show that the proposed methodology can deliver novel rotor topologies for the CP-PMSM with surprising torque quality since the torque ripple is suppressed to a low level with no average torque sacrifice. 

Performance Analysis and Comparison of Two Fault-Tolerant Model Predictive Control Methods for Five-Phase PMSM Drives

Authors: Wentao Huang, Wei Hua,  Qigao Fan

Abstract—Model predictive current control (MPCC) and model predictive torque control (MPTC) are two derivatives of model predictive control. These two control methods have demonstrated their strengths in the fault-tolerant control of multiphase motor drives. To explore the inherent link, the pros and cons of two strategies, the performance analysis and comparative investigation of MPCC and MPTC are conducted through a five-phase permanent magnet synchronous motor with open-phase fault. In MPCC, the currents of fundamental and harmonic subspaces are simultaneously employed and constrained for a combined regulation of the open-circuit fault drive. In MPTC, apart from the torque and the stator flux related to fundamental subspace, the x-y currents are also considered and predicted to achieve the control of harmonic subspace. The principles of two methods are demonstrated in detail and the link is explored in terms of the cost function. Besides, the performance by two methods is experimentally assessed in terms of steady-state, transition, and dynamic tests. Finally, the advantages and disadvantages of each method are concluded.

Design of an Asymmetric Rotor Pole for Wound Field Synchronous Machines

Authors: Wenping Chai, Byung-il Kwon

Abstract—This study proposes a novel asymmetric rotor pole design for wound field synchronous machines (WFSMs), which can achieve high saliency ratio and also low torque ripple. The key point is the optimal design of the asymmetric rotor pole with the inverse-cosine-shaped (ICS) plus reverse 3rd harmonic shaping. The asymmetric rotor pole can help to improve the average output torque by enhancing the saliency ratio. The reverse 3rd harmonic shaping on the rotor pole surface is mainly used to reduce the torque ripple. To certify the effectivity of the proposed design, three-phase 54-slot / 6-pole 4.7kW WFSMs with uniform air gap and with non-uniform air gap shaped by the ICS plus optimum reverse 3rd harmonic are utilized as the basic model and referenced model for comparison. For the referenced model, the optimum amplitude of reverse 3rd harmonic is preferred as 1/6. Finally, all electromagnetic characteristics of the investigated machines are predicted by the finite-element method (FEM). The highest saliency ratio and comparatively low torque ripple have been verified.

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