A Linear Doubly Salient Permanent Magnet Motor with Modular and Complementary Structure

Cao Ruiwu; Cheng Ming; Hua Wei; Zhao Wenxiang

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A Linear Doubly Salient Permanent Magnet Motor with Modular and Complementary Structure

Cao Ruiwu 1,Cheng Ming 1 * #,Hua Wei 1,Zhao Wenxiang 2

1.School of Electrical Engineering, Southeast University

2.School of Electrical and Information Engineering, Jiangsu University

*Correspondence author

#Submitted by

Subject:

Funding: the Specialized Research Fund for the Doctoral Program of Higher Education of China （No.20090092110034）, the Program for Postgraduates Research Innovation in University of Jiangsu Province 2010 （No.X10B_066Z)）, NSFC （No.50907031, 60974060）

Opened online:24 March 2011

Accepted by: none

Citation: Cao Ruiwu,Cheng Ming,Hua Wei.A Linear Doubly Salient Permanent Magnet Motor with Modular and Complementary Structure[OL]. [24 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4416873

A linear doubly salient permanent magnet (LDSPM) motor is particularly suitable for long stator applications due to its simple and low cost stator, which consists of only iron. This paper proposes a novel LDSPM motor with complementary and modular structure. The key of this structure is that the primary mover are composed of two modules whose positions are mutually four and one half of the stator pole pitch apart and there is a flux barrier between them. Hence, the back electromotive force (EMF) waveform and cogging force of the two modules have 180 electrical degree differences. This results in the total cogging force being cancelled and the back-EMF of each phase becoming symmetrical. For fair comparison, an existing linear LDSPM motor is designed based on the same electromagnetic parameters and compared by the means of finite element analysis (FEA). The results reveal that the proposed LDSPM motor can offer symmetrical back-EMF waveforms, smaller cogging force, lower force ripple and higher magnet utilization factor than the existing LDSPM.

Keywords:Double salient; otor; linear motor; permanent magnet; finite elementanalysis

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