A Linear Doubly Salient Permanent-Magnet Motor With Modular and Complementary Structure
A Linear Doubly Salient Permanent-Magnet Motor With Modular and Complementary Structure
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DOI：
10.1109/tmag.2011.2160554
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发表时间：
2011-06
影响因子：
2.1
通讯作者：
R. Cao;M. Cheng;C. Mi;W. Hua;Wenxiang Zhao
中科院分区：
文献类型：
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作者：
R. Cao;M. Cheng;C. Mi;W. Hua;Wenxiang Zhao
线性双凸极永磁 (LDSPM) 电机特别适合长定子应用，因为其定子简单且成本低廉，仅由铁组成。本文提出了一种具有互补和模块化结构的新型 LDSPM 电机设计。这种结构的关键是原动机由两个模块组成，两个模块的位置相互间隔四分二分之一的定子极距，并且它们之间有磁通屏障。因此，两个模块的反电动势（EMF）波形和齿槽力有180电角度的差异。这种设计导致总齿槽力显着降低，并且由于偶次谐波被消除，所以每相的反电动势变得对称。为了公平比较，现有的线性 LDSPM 电机基于相同的电磁参数进行设计，并通过有限元分析 (FEA) 进行比较。结果表明，与现有电机相比，所提出的 LDSPM 电机可以提供对称的反电动势波形、更小的齿槽力、更低的力波动和更高的磁体利用率。
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 new LDSPM motor design with complementary and modular structure. The key of this structure is that the primary mover is 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 design results in the total cogging force being significantly reduced and the back-EMF of each phase becoming symmetrical because the even harmonics are canceled. 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 one.