The Method Pole of Width Modulation Reducing Cogging Torque in Permanent Magnet Motor

2012 ◽  
Vol 433-440 ◽  
pp. 4201-4206
Author(s):  
Yue Jun An ◽  
Wen Qiang Zhao ◽  
Li Ping Xue ◽  
Hong Liang Wen ◽  
Guo Ming Liu
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Experimental Result ◽  
Testing System ◽  
Permanent Magnet Motors ◽  
Permanent Magnet Motor ◽  
Surface Type ◽  
Angle Sensor ◽  
Cogging Torque ◽  
Simulation Results

Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

The Method of Pole Width Modulation Reducing Cogging Torque in Permanent Magnet Motor

2011 ◽  
Vol 383-390 ◽  
pp. 1369-1375
Author(s):  
Yue Jun An ◽  
Wen Qiang Zhao ◽  
Li Ping Xue ◽  
Hong Liang Wen ◽  
Guo Ming Liu
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Experimental Result ◽  
Testing System ◽  
Permanent Magnet Motors ◽  
Permanent Magnet Motor ◽  
Surface Type ◽  
Angle Sensor ◽  
Cogging Torque ◽  
Simulation Results

Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

scholarly journals Analysis of Torque Ripple and Cogging Torque Reduction in Electric Vehicle Traction Platform Applying Rotor Notched Design

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3053 ◽  
Author(s):  
Myeong-Hwan Hwang ◽  
Hae-Sol Lee ◽  
Hyun-Rok Cha
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Field Analysis ◽  
Permanent Magnet Motors ◽  
Primary Methods ◽  
Cogging Torque ◽  
Electric Cars ◽  
Electric Control ◽  
Interior Permanent Magnet ◽  
Rotor Shape

Drive motors, which are used in the drive modules of electric cars, are interior permanent magnet motors. These motors tend to have high cogging torque and torque ripple, which leads to the generation of high vibration and noise. Several studies have attempted to determine methods of reducing the cogging torque and torque ripple in interior permanent magnet motors. The primary methods of reducing the cogging torque involve either electric control or mechanical means. Herein, the authors focused on a mechanical method to reduce the cogging torque and torque ripple. Although various methods of reducing vibration and noise mechanically exist, there is no widely-known comparative analyses on reducing the vibration and noise by designing a notched rotor shape. Therefore, this paper proposes a method of reducing vibration and noise mechanically by designing a notched rotor shape. In the comparative analysis performed herein, the motor stator and rotor were set to be the same size, and electromagnetic field analysis was performed to determine a notch shape that is suitable for the rotor and that generates reasonable vibration and noise.

Design and analysis of a high-performance surface inset permanent magnet motor with asymmetrical rotor

2020 ◽  
Vol 64 (1-4) ◽  
pp. 211-220
Author(s):  
Wenliang Zhao ◽  
Cong Liu ◽  
Yujing Li ◽  
Xue Fan ◽  
Xiuhe Wang
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
Torque Ripple ◽  
Performance Comparison ◽  
The Finite Element Method ◽  
Permanent Magnet Motor ◽  
Cogging Torque ◽  
Torque Pulsations ◽  
Performance Surface ◽  
Novel Design

This paper presents a novel design strategy for surface inset permanent magnet (SIPM) motors to suppress torque pulsations and maintain the high output torque by integrating the magnet skewing and asymmetrical rotor configurations. The magnet skewing is implemented within one magnet pole pitch to reduce cogging torque by avoiding excessive torque degradation, and the asymmetrical rotor is designed to improve the utilization of the torque components, thus to compensate the decreased torque due to the magnet skewing. To highlight the advantages of the proposed motor, a conventional SIPM motor is adopted for performance comparison with the aid of the finite element method. As a result, the proposed SIPM motor highly reduced the cogging torque (−79.7%) and torque ripple (−54.7%) while maintaining a high average torque when compared to the conventional SIPM motor.

Optimal design of a surface-mounted permanent magnet motor with multi-grade ferrite magnets to reduce torque pulsations

2020 ◽  
Vol 64 (1-4) ◽  
pp. 79-89
Author(s):  
Yan Liu ◽  
Wenliang Zhao ◽  
Xue Fan ◽  
Xiuhe Wang ◽  
Byung-il Kwon
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Kriging Method ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Cogging Torque ◽  
The Finite Element Analysis ◽  
Torque Pulsations ◽  
Flux Density Distribution

This paper proposes an optimal design for a surface-mounted permanent magnet motor (SPMM) to reduce torque pulsations, including cogging torque and torque ripple, by using multi-grade ferrite magnets. Based on a conventional SPMM with single-grade ferrite magnets, the proposed SPMM is designed with four-grade ferrite magnets and then optimized to minimize torque pulsations by maintaining the required torque, utilizing the Kriging method and a genetic algorithm. The results obtained by the finite element analysis show that the optimized SPMM with multi-grade ferrite magnets exhibits improved airgap flux density distribution with highly reduced cogging torque and torque ripple by maintaining the same average torque, as compared to the conventional SPMM. Furthermore, the analysis of the working points for the multi-grade ferrite magnets reveals that the optimized SPMM has good durability against the irreversible demagnetization.

scholarly journals Analysis and Prediction of Cogging Torque and ripples in output Torque of Permanent Magnet Synchronous Motor and Line Start Permanent Magnet Synchronous Motor

2021 ◽  
Vol 12 (3) ◽  
pp. 4586-4595
Author(s):  
Ravisankar B Et.al
Keyword(s):  
Permanent Magnet ◽  
Energy Efficient ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Permanent Magnet Motor ◽  
Efficient Operation ◽  
Cogging Torque ◽  
Torque Analysis ◽  
Torque Ripples

Permanent magnet (PM) motors are rapidly replacing the squirrel cage induction motors for its energy efficient operation, smooth control and high power density. Although PM Motors are energy efficient, they are inherently affected by cogging torque and torque ripple. Magnetic alignment between teeth of stator and permanent magnet of rotors produce cogging torque. Torque ripple is a dynamic oscillation during steady-steady operation which leads to various mechanical anomalies like vibration, noise and rotor stress. Torque ripple is produced in PM motors because of non-sinusoidal distribution of flux, saturation, improper selection of slots etc., these ill effects will deteriorate the starting and steady-state performance of motors. So it is very vital to make analysis and prediction of cogging torque and torque ripples to make the motor more effective. Now a day's minimizing the torque ripples and cogging torque are gaining importance in PM motor designs. In this proposed work, the cogging torque analysis and torque ripple analysis of permanent magnet motor and line start permanent magnet motor has been done and reported.

Study and design of dual stator permanent magnet machine with spoke-type configurations using phase-group concentrated-coil windings

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1381-1389
Author(s):  
Dezhi Chen ◽  
Chengwu Diao ◽  
Zhiyu Feng ◽  
Shichong Zhang ◽  
Wenliang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Low Cost ◽  
Dynamic Performance ◽  
Torque Ripple ◽  
Permanent Magnet Machine ◽  
Torque Density ◽  
Phase Group ◽  
High Torque ◽  
Simulation Results

In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

Optimization of Magnets Shape for Cogging Torque Reduction in Axial-Flux Permanent Magnet Motors

2021 ◽  
pp. 1-1
Author(s):  
Vicente Simon-Sempere ◽  
Auxiliadora Simon-Gomez ◽  
Manuel Burgos ◽  
Jose-Ramon Cerquides-Bueno
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Motors ◽  
Axial Flux ◽  
Cogging Torque
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