This article proposes a design method of the high-speed multilayer interior permanent magnet synchronous motor (HSML IPMSM) employing the ferrite permanent magnet (PM). Since the maximum speed of the traction motor in this article is 15 kr/min, the mechanical stability must be considered. Additionally, in the case of the HSML IPMSM, as the number of the PM layers increases, the thickness of the PMs must be reduced to be mechanically stable. On the other hand, because the ferrite PM has a relatively low coercive force compared with the Nd PM, an irreversible demagnetization of the ferrite PM of the HSML IPMSM is likely to occur. Therefore, the mechanical stability and irreversible demagnetization must be considered at all design steps. As the irreversible demagnetization and mechanical stability can be confirmed only by the finite-element analysis (FEA), the proposed method in this article is a design method that considers the irreversible demagnetization and mechanical characteristics at all design steps using the FEA. After the design of the traction motor is completed using this design method, the designed motor is manufactured. To verify the validity of the design method, experiments are conducted on the manufactured motor, and the test results are compared with FEA results.

中文翻译：

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考虑机械和电气特性的电动汽车牵引用铁氧体永磁高速多层IPMSM设计

本文提出了一种采用铁氧体永磁（PM）的高速多层内置永磁同步电机（HSML IPMSM）的设计方法。由于本文中牵引电机的最高转速为15 kr/min，因此必须考虑机械稳定性。此外，在 HSML IPMSM 的情况下，随着 PM 层数的增加，必须减小 PM 的厚度以保持机械稳定。另一方面，由于铁氧体PM与Nd PM相比具有相对较低的矫顽力，因此HSML IPMSM的铁氧体PM可能发生不可逆退磁。因此，在所有设计步骤中都必须考虑机械稳定性和不可逆退磁。由于不可逆退磁和机械稳定性只能通过有限元分析（FEA）来确定，本文提出的方法是一种使用有限元分析在所有设计步骤中考虑不可逆退磁和机械特性的设计方法。使用这种设计方法完成牵引电机的设计后，就制造出设计好的电机。为了验证设计方法的有效性，对制造的电机进行了实验，并将测试结果与有限元分析结果进行了比较。