scholarly journals COGGING TORQUE AND TORQUE RIPPLE IN A DIRECT-DRIVE INTERIOR PERMANENT MAGNET GENERATOR

2016 ◽  
Vol 70 ◽  
pp. 73-85
Author(s):  
Rukmi Dutta ◽  
Kazi Ahsanullah ◽  
Faz Rahman
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Direct Drive ◽  
Cogging Torque ◽  
Interior Permanent Magnet ◽  
Permanent Magnet Generator

scholarly journals A Study on a Linear Magnetic-Geared Interior Permanent Magnet Generator for Direct-Drive Wave Energy Conversion

Energies ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 487 ◽  
Author(s):  
Ningjun Feng ◽  
Haitao Yu ◽  
Minqiang Hu ◽  
Chunyuan Liu ◽  
Lei Huang ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Permanent Magnet ◽  
Wave Energy ◽  
Direct Drive ◽  
Wave Energy Conversion ◽  
Interior Permanent Magnet ◽  
Permanent Magnet Generator

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.

scholarly journals Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7816
Author(s):  
Fei Zhao ◽  
Mengzhu Cao ◽  
Encheng Tao ◽  
Liyi Li
Keyword(s):  
Permanent Magnet ◽  
Uniform Design ◽  
Three Dimensional ◽  
Torque Ripple ◽  
Uniform Structure ◽  
Direct Drive ◽  
Cogging Torque ◽  
Dimensional Finite Element ◽  
Aerial Vehicle ◽  
Three Dimensional Finite Element

To improve the torque performance of the permanent magnet vernier machine in the direct-drive system for Unmanned Aerial Vehicle (UAV), this paper proposes the topology of non-uniform tooth distribution. This distribution, considering the additional flux harmonics, aims to contribute to torque improvement, whereas the cogging torque also increases at the same time. A phasors method is proposed to solve the issue caused by the non-uniform structure, adjusting the mechanic angle of each tooth reasonably to restrict the cogging torque. In addition, the non-uniform design is illustrated in detail, which includes the method of grouping the teeth, considering the factors of series pole ratio and winding layout. By using the three-dimensional finite element method, torque is significantly increased without additional torque ripple, which satisfies the desired design target.

scholarly journals Torque Ripple Optimization of a Novel Cylindrical Arc Permanent Magnet Synchronous Motor Used in a Large Telescope

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 362
Author(s):  
Shuhua Fang ◽  
Songhan Xue ◽  
Zhenbao Pan ◽  
Hui Yang ◽  
Heyun Lin
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Direct Drive ◽  
Large Telescope ◽  
Tracking Accuracy ◽  
Cogging Torque ◽  
Low Torque ◽  
Large Telescopes

This paper proposes the use of a novel cylindrical arc permanent magnet synchronous motor (CAPMSM) in a large telescope, which requires high positioning accuracy and low torque ripple. A 2D finite element method was used to analyze the cogging torque of the CAPMSM. The CAPMSM can be an alternative for a rotating motor to realize direct drive. A new method is proposed to separate the cogging torque, Tcog, into the torque, Tslot, generated by the slotted effect and the end torque, Tend, generated by the end effect. The average torque and the torque ripple are optimized considering stator center angle, the angle between two adjacent stators and the unequal thickness of a Halbach permanent magnet. The torque ripple decreased from 31.73% to 1.17%, which can satisfy the requirement of tracking accuracy for large telescopes.

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