Analysis of a Novel Double-Sided Yokeless Multitooth Linear Switched-Flux PM Motor

A novel double-sided yokeless multitooth linear switched-flux permanent magnet (DYMLSFPM) motor is proposed to improve the electromagnetic performance of conventional double-sided linear switched-flux PM (DLSFPM) motor in terms of force ripple and cogging force. Its feature of structure is the multi...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-02, Vol.65 (2), p.1837-1845
Main Authors: Shen, Yiming, Lu, Qinfen, Li, Huanwen, Cai, Jiongjiong, Huang, Xiaoyan, Fang, Youtong
Format: Article
Language:English
Subjects:
Cogging
Double sided
Electromagnetics
Finite element method
Flux
Force
Genetic algorithms
Global optimization
linear motor
Mathematical analysis
Motors
multitooth
Optimization
Permanent magnet motors
Permanent magnets
Poles
Reluctance motors
switched flux
Switches
Thrust
yokeless
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Summary:A novel double-sided yokeless multitooth linear switched-flux permanent magnet (DYMLSFPM) motor is proposed to improve the electromagnetic performance of conventional double-sided linear switched-flux PM (DLSFPM) motor in terms of force ripple and cogging force. Its feature of structure is the multitooth primary without yoke. First, an analytical method of permeance model is developed for determining the optimal combination of primary slots and secondary poles. For DYMLSFPM motor with six primary slots, there are four available different secondary poles 16/17/19/20, respectively. By comparing the results of four combinations, it shows that the DYMLSFPM motor with 19 secondary poles can have better thrust force performance, which is also verified by the finite-element analysis. After all these four structures are optimized first by single-variable optimization and then by global optimization with genetic algorithm for further analysis, 6-slots/19-poles (6s/19p) combination can have the second highest average thrust force and the lowest thrust ripple. Moreover, it requires significantly smaller volume of PMs and exhibits much lower cogging force than conventional 6s/7p DLSFPM motor. Finally, a prototype of 6s/19p DYMLSFPM motor is manufactured and tested to validate the predicted results.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2696492