scholarly journals Analysis and reduction of cogging torque in direct‐drive external‐rotor permanent magnet synchronous motor for belt conveyor application cogging torque reduction of ERPMSM

2021 ◽  
Author(s):  
Yongda Song ◽  
Zhaoyu Zhang ◽  
Siyang Yu ◽  
Fengge Zhang ◽  
Yuan Zhang
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Direct Drive ◽  
Belt Conveyor ◽  
Cogging Torque ◽  
External Rotor

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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