Reduction in Torque Ripple by Applying an Asymmetric Rotor to PMSM

2021 ◽  
Vol 141 (6) ◽  
pp. 445-452
Author(s):  
Makoto Ito ◽  
Shinji Sugimoto ◽  
Akeshi Takahashi ◽  
Shuichi Tamiya ◽  
Takatoshi Kushida
Keyword(s):  
Torque Ripple ◽  
Asymmetric Rotor

Torque ripple optimization for synchronous reluctance motors based on a virtual permanent magnet harmonic machine model

2021 ◽  
Vol 67 (3) ◽  
pp. 327-338
Author(s):  
Yixiang Xu ◽  
Chong Di ◽  
Xiaohua Bao ◽  
Dongying Xu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Air Gap ◽  
Analysis Model ◽  
Machine Model ◽  
Asymmetric Rotor ◽  
Rotor Flux ◽  
Air Gap Magnetic Field ◽  
Intermediate Variables

The torque ripple is affected by both the stator and the rotor magnetic field harmonics. In synchronous reluctance motors (SynRM), there are only rotor permeance harmonics existing on the rotor side for the absence of the rotor windings. Since the asymmetric rotor flux barriers are widely applied in the SynRM rotor, it is difficult to calculate the rotor permeance accurately by the analytical method. In this article, the effects of the rotor permeance harmonics on the air-gap magnetic field are studied by a virtual permanent magnet harmonic machine (VPMHM), which is a finite-element (FE) based magnetostatic analysis model. The air-gap flux density harmonics produced by the SynRM rotor are extracted from the VPMHM model and used as the intermediate variables for the torque ripple optimization. The proposed method does not need to solve the transient process of motor motion. Hence, the time of the optimization process can be significantly shortened. Finally, a full electric cycle is simulated by dynamic FE simulation, and the torque ripple is proved to be effectively reduced.

scholarly journals Control method of high-speed switched reluctance motor with an asymmetric rotor magnetic circuit

2016 ◽  
Vol 65 (4) ◽  
pp. 685-701 ◽  
Author(s):  
Piotr Bogusz ◽  
Mariusz Korkosz ◽  
Jan Prokop
Keyword(s):  
High Speed ◽  
Magnetic Circuit ◽  
Control Method ◽  
Torque Ripple ◽  
Negative Slope ◽  
Electromagnetic Torque ◽  
Switched Reluctance Motors ◽  
Switched Reluctance ◽  
Asymmetric Rotor ◽  
Current Flows

Abstract In the paper, the modified (compared to the classical asymmetric half-bridge) converter for a switched reluctance machine with an asymmetric rotor magnetic circuit was analysed. An analysis for two various structures of switched reluctance motors was conducted. The rotor shaping was used to obtain required start-up torque or/and to obtain less electromagnetic torque ripple. The discussed converter gives a possibility to turn a phase off much later while reduced time of a current flows in a negative slope of inductance. The results of the research in the form of waveforms of currents, voltages and electromagnetic torque were presented. Conclusions were formulated concerning the comparison of the characteristics of SRM supplied by the classic converter and by the one supplied by the analysed converter.

Torque Ripple Reduction Using Torque Compensation Effect of an Asymmetric Rotor Design in IPM Motor

2017 ◽  
Vol 22 (2) ◽  
pp. 266-274
Author(s):  
Yong-Suk Hwang ◽  
Myung-Hwan Yoon ◽  
Jin-Cheol Park ◽  
Jung-Pyo Hong
Keyword(s):  
Compensation Effect ◽  
Torque Ripple ◽  
Rotor Design ◽  
Torque Ripple Reduction ◽  
Asymmetric Rotor ◽  
Ripple Reduction

Design and Finite Element Analysis of a Novel Permanent Magnet Assisted Reluctance Synchronous Motor

2020 ◽  
Vol 35 (9) ◽  
pp. 1012-1021
Author(s):  
Xianming Deng ◽  
Ran Li ◽  
Lei Hao ◽  
Ankang Zhang ◽  
Junhong Zhou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Permanent Magnet ◽  
Harmonic Component ◽  
Optimization Method ◽  
Torque Ripple ◽  
Element Analysis ◽  
Reluctance Machine ◽  
Steady State Operation ◽  
Asymmetric Rotor

In this paper, a permanent magnet assisted synchronous reluctance machine (PMASRM) with optimized permanent magnet width and asymmetric rotor structure is proposed. A typical PMASRM is selected as the reference motor (Pre-optimized PMASRM). In order to reduce the large torque ripple of conventional PMASRM, an optimization method to design the permanent magnet width is investigated and the Optimized Magnet-width PMASRM is proposed. On this basis, an asymmetric flux barriers structure is proposed to further reduce the torque ripple. Some electromagnetic characteristics including air-gap flux density, no-load back EMF and motor efficiency are examined by Finite Element Analysis (FEA). The simulation results show that the proposed PMASRM can not only decrease the harmonic component of no-load back EMF obviously, but also reduce the torque ripple in steady-state operation, which proves the rationality of the motor structure.

Torque Ripple Reduction of IPMSM Applying Asymmetric Rotor Shape Under Certain Load Condition

2018 ◽  
Vol 33 (1) ◽  
pp. 333-340 ◽  
Author(s):  
Young-Hoon Jung ◽  
Myung-Seop Lim ◽  
Myung-Hwan Yoon ◽  
Jae-Sik Jeong ◽  
Jung-Pyo Hong
Keyword(s):  
Load Condition ◽  
Torque Ripple ◽  
Torque Ripple Reduction ◽  
Asymmetric Rotor ◽  
Ripple Reduction ◽  
Rotor Shape
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