Permanent magnet synchronous motor (PMSM) for electric vehicles is developing higher frequency and speed but triggering a significant increase of eddy current loss. To resolve the eddy current loss issue, a novel flat wire transposed winding composed of double-row multiple parallel strands is proposed. Transposed winding techniques have been proved to be efficient in reducing eddy current loss by preventing the uneven leakage magnetic field induced by high frequency. The proposed transposition further improved this technique in reducing circulating current loss. Taking a 60-kW PMSM as an example, the novel flat wire transposed winding arrangement is carried out. The 3-D field-circuit coupled finite-element models of 360° complete transposed and incomplete transposed winding PMSM are established, and circulating current losses are compared. The analysis results show that incomplete transposed winding has a better performance in reducing the circulating current loss. The transposition method suitable for novel flat wire transposed winding is obtained, and the feasibility of PMSM with novel flat wire transposed winding to reduce winding losses is proven.

中文翻译：

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电动汽车永磁同步电机新型扁线换位绕组研究

用于电动汽车的永磁同步电机 (PMSM) 正在开发更高的频率和速度，但引发了涡流损耗的显着增加。为了解决涡流损耗问题，提出了一种由双排多股平行线组成的新型扁线换位绕组。转置绕组技术已被证明可通过防止高频引起的不均匀漏磁场来有效降低涡流损耗。所提出的换位进一步改进了该技术以减少循环电流损耗。以60kW永磁同步电机为例，进行了新颖的扁线换位绕组布置。建立了360°完全转置和不完全转置绕组永磁同步电机的三维场路耦合有限元模型，并比较了环流损耗。分析结果表明，不完全换位绕组在降低环流损耗方面具有较好的性能。得出了适用于新型扁线换位绕组的换位方法，证明了采用新型扁线换位绕组的永磁同步电机降低绕组损耗的可行性。