Investigation of PM Eddy Current Losses in Surface-Mounted PM Motors Caused by PWM
Investigation of PM Eddy Current Losses in Surface-Mounted PM Motors Caused by PWM
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DOI：
10.1109/tpel.2019.2895679
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发表时间：
2019-01
影响因子：
6.7
通讯作者：
J. Ou;Yingzhen Liu;D. Liang;M. Doppelbauer
中科院分区：
文献类型：
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作者：
J. Ou;Yingzhen Liu;D. Liang;M. Doppelbauer
众所周知，空间磁场谐波会引起表面安装永磁体的涡流损耗，特别是对于分数槽永磁电机。然而，时间电流谐波的影响，特别是高次谐波的逆变器的脉宽调制电压所造成的，缺乏关注。研究了高次谐波电流对永磁电机涡流损耗的影响。为了简化计算，节省计算时间，采用解析方法预测PWM逆变器引起的电流谐波，以及电流谐波产生的电枢反应磁场、涡流密度和永磁体损耗。有限元分析，耦合仿真，实验研究来验证分析结果。研究结果表明，尽管高次电流谐波幅值很小，但高次电流谐波引起的涡流损耗远大于开槽电流和基波电流引起的涡流损耗。
It is well known that spatial field harmonics will cause high eddy current losses in surface-mounted permanent magnets (PMs) especially for the fractional-slot PM motors. However, the influence of temporal current harmonics, especially of the high-order temporal harmonics caused by pulsewidth modulation voltages from an inverter, lacks attentions. This paper studies the eddy current losses of the PMs caused by high-order current harmonics. In order to simplify the calculation and save computation time, analytical methods are used to predict the current harmonics caused by the PWM inverter, and the armature reaction field, the eddy current density, and losses in the PMs generated by the current harmonics. Finite element analysis, coupling simulation, and experimental studies are used to verify the analytical results. The study results show that the high-order current harmonics cause much higher eddy current losses than those caused by slotting and fundamental current even though the amplitudes of the high-order current harmonics are much lower.