An Improved Configuration for Cogging Torque Reduction in Flux-Reversal Permanent Magnet Machines
An Improved Configuration for Cogging Torque Reduction in Flux-Reversal Permanent Magnet Machines
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DOI：
10.1109/cefc.2016.7816063
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发表时间：
2016-11
影响因子：
2.1
通讯作者：
Xiaofeng Zhu;W. Hua
中科院分区：
文献类型：
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作者：
Xiaofeng Zhu;W. Hua
磁通反向永磁电机由于其特殊的双凸极结构和气隙磁通密度，通常会产生较大的齿槽转矩，从而导致转矩和速度脉动，以及噪声和振动，特别是在低速时。因此，本文提出了一种通过在属于同一定子齿的两个相邻磁体之间引入小的空间间隙来改进RPM机的结构。推导了考虑该间隙时齿槽转矩的解析表达式，并进一步解析地得到了齿槽转矩最小化时间隙的最佳尺寸。此外，基于空间间隙的配置对关键的电磁性能，包括齿槽转矩，反电动势，和电磁转矩的影响，通过两个二维有限元分析和实验结果进行了研究。结果是，通过采用这种配置，不仅可以抑制齿槽转矩，从而抑制转矩波动，而且可以提高电磁转矩。
A flux-reversal permanent magnet (FRPM) machine typically suffers from unfavorably large cogging torque due to its special doubly salient structure and high air-gap flux density, resulting in undesired torque and speed ripples, as well as acoustic noise and vibration, especially at low speeds. Therefore, an improved configuration of FRPM machines by introducing a small space-gap between the two adjacent magnets belonging to the same stator tooth is proposed in this paper. The analytical expression of cogging torque taking this small space gap into consideration is derived, and furthermore, the optimal dimensions of the space gap are obtained analytically for cogging torque minimization. In addition, the influences of the space-gap-based configuration on key electromagnetic performances, including cogging torque, back electromotive force, and electromagnetic torque, are investigated by both 2-D finite-element analysis and experimental results. It turns out to be that by employing this configuration, not only the cogging torque, and hence, torque ripples can be suppressed, but also the electromagnetic torque can be improved.