非对称极点成形法抑制顺极永磁电机转矩脉动

J. Qi, Z.Q. Zhu, L. Yan, G. Jewell, C. Gan, Y. Ren, S. Brockway, C. Hilton
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引用次数: 6

摘要

顺向极(CP)永磁(PM)电机作为一种通过显著减少满足特定转矩规格所需的永磁体体积来降低机器成本的手段,引起了相当大的兴趣。然而,CPPM结构产生的大扭矩脉动可能会阻碍它们在某些应用中的应用,特别是对于占主导地位的三阶扭矩脉动。虽然已经提出了一些特定的设计修改来改善转矩脉动,但可以论证的是,支持这种行为的广义原理尚未完全建立。在本文中,将说明电感,反电动势和齿槽转矩波动的聚集有助于增加转矩脉动。同时,以占主导地位的三阶转矩脉动为例,提出了一种非对称极点整形方法来减小转矩脉动。12槽/8极样机的仿真结果表明,与对称极形模型和平面极形模型相比,所提出的非对称极形方法能有效地减小转矩脉动。
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Suppression of Torque Ripple for Consequent Pole PM Machine by Asymmetric Pole Shaping Method
Consequent pole (CP) permanent magnet (PM) machines have attracted considerable interest as a means of reducing machine cost through a marked reduction in the volume of permanent magnet required to meet a particular torque specification. However, the presence of a large torque ripple that can result from the CPPM structure can hinder their adoption in some applications, especially for the dominant third order torque ripple. Although several design-specific modifications have been proposed to ameliorate torque ripple, arguably the generalized principles underpinning this behavior have not been fully established. In this paper, it will be illustrated that an aggregation of the fluctuations in inductance, back EMF and cogging torque contributes to increased torque ripple. Meanwhile, an asymmetric pole shaping method is proposed to reduce the torque ripple, taking the dominant third order torque ripple as example. Simulated results of the 12-slot/8-pole prototypes show that compared to symmetrical pole shaping model and the plain pole model, the proposed asymmetric shaping method is effective in reducing torque ripple.
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