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On-Load Voltage Distortion in Fractional-Slot Interior Permanent Magnet Machines

机译：小槽内部永磁电机的有载电压失真

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摘要

The mechanism and the influence of the on-load terminal phase voltage distortion by the armature reaction in interior permanent magnet (IPM) machines with fractional-slot concentrated windings (FSCWs) are investigated in this paper, by taking a 12-slot/8-pole machine as an example. The phenomenon is presented first, which shows that the peak voltage will be much higher than the fundamental value, especially under the flux-weakening operation. Then, the mechanism is investigated with the aid of the frozen permeability method. Due to the geometric feature of the FSCW IPM rotor, the armature reaction flux will asymmetrically enhance the local magnetic saturation in the tooth-tips and the rotor lamination region near the rotor ribs, which disrupt the smooth variation of phase flux linkage and lead to a voltage distortion. With the increasing of current advancing angle (), this effect will become more obvious and result in the higher distortion level. Furthermore, the influences of voltage distortion on the machine torque performance are investigated, which show that it will only contribute to the torque ripple in the constant torque region, but will largely reduce the flux-weakening operation region compared with the ideal one calculated by the fundamental voltages only. Finally, a prototype is manufactured and tested to validate the analyses.
机译：本文研究了带有小槽集中绕组（FSCW）的内部永磁体（IPM）电机中电枢反应对有载终端相电压畸变的机理及其影响，方法是采用12槽/ 8-以立杆机为例。首先介绍该现象，这表明峰值电压将大大高于基值，尤其是在弱磁通情况下。然后，借助冻结渗透率方法研究了机理。由于FSCW IPM转子的几何特征，电枢反应通量将不对称地增强齿尖和转子肋附近的转子叠片区域中的局部磁饱和，这会扰乱相磁链的平滑变化并导致电压失真。随着电流前进角（）的增加，这种影响将变得更加明显，并导致更高的失真度。此外，研究了电压畸变对电机转矩性能的影响，表明电压畸变只会对恒定转矩区域中的转矩脉动做出贡献，而与由转矩计算得出的理想值相比，磁化强度下降的工作区域将大大减少。仅基础电压。最后，制造并测试原型以验证分析结果。

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