Torque Ripple Reduction of a Novel Modular Arc-Linear Flux-Switching Permanent-Magnet Motor with Rotor Step Skewing
Torque Ripple Reduction of a Novel Modular Arc-Linear Flux-Switching Permanent-Magnet Motor with Rotor Step Skewing
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DOI：
10.3390/en9060404
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发表时间：
2016-05
期刊：
影响因子：
3.2
通讯作者：
Xiangdong Liu;Z. Gu;J. Zhao
中科院分区：
文献类型：
--
作者：
Xiangdong Liu;Z. Gu;J. Zhao
本文提出并通过有限元法（FEM）研究了一种新型模块化弧线磁通切换永磁电机（MAL-FSPM），用于代替减速齿轮箱和运动机构用于扫描系统。 MAL-FSPM结合了磁通开关永磁电机和直线电机的特点，可以实现直接驱动和有限角运动。分析了MAL-FSPM的结构和工作原理。建立了MAL-FSPM的齿槽转矩模型。研究了齿槽转矩和转矩脉动的特性： (1)转子左端与定子左端之间的距离(d end )大于两个转子齿距(τ p )； (2)d端小于两个转子齿距。齿槽转矩是转矩脉动的重要组成部分，优化前的MAL-FSPM的齿槽转矩与反电动势(EMF)的周期比等于1。为了尽可能减小转矩脉动并尽可能减少对反电势的影响，研究了齿槽转矩与反电势的周期比对转子阶跃歪斜的影响。优化转子齿宽和定子槽开口宽度，提高齿槽转矩与反电动势的周期比。优化后，当d end > τ p 时，转矩脉动降低了79.8%；当d end < τ p 时，转矩脉动降低了49.7%。最后，建立3D FEM模型来验证2D结果。
A novel modular arc-linear flux-switching permanent-magnet motor (MAL-FSPM) used for scanning system instead of reduction gearboxes and kinematic mechanisms is proposed and researched in this paper by the finite element method (FEM). The MAL-FSPM combines characteristics of flux-switching permanent-magnet motor and linear motor and can realize the direct driving and limited angular movement. Structure and operation principle of the MAL-FSPM are analyzed. Cogging torque model of the MAL-FSPM is established. The characteristics of cogging torque and torque ripple are investigated for: (1) distance ( d end ) between left end of rotor and left end of stator is more than two rotor tooth pitch (τ p ); and (2) d end is less than two rotor tooth pitch. Cogging torque is an important component of torque ripple and the period ratio of the cogging torque to the back electromotive force (EMF) equals one for the MAL-FSPM before optimization. In order to reduce the torque ripple as much as possible and affect the back EMF as little as possible, influence of period ratio of cogging torque to back EMF on rotor step skewing is investigated. Rotor tooth width and stator slot open width are optimized to increase the period ratio of cogging torque to back EMF. After the optimization, torque ripple is decreased by 79.8% for d end > τ p and torque ripple is decreased by 49.7% for d end < τ p . Finally, 3D FEM model is established to verify the 2D results.