Permanent magnet synchronous machines (PMSMs) are widely used owing to high power density, high efficiency, etc. Core losses account for a significant component of the total loss in PMSMs beside winding losses. Therefore, it is necessary to consider core losses when designing PMSMs according to actual research applications. In this paper, taking four typical rotor structures (surface-mounted, embedded, “—” shape, “V” shape) as examples, an analysis method is proposed to predict the influence of different rotor structures on core loss of PMSMs. In the case of the same stator and winding structures, due to the influence of the rotor structure on the magnetic circuit, the corresponding variation law of the magnetic field in the stator core is studied. This method analyzes the radial and tangential components of magnetic flux density vector of the 4 representative points (stator tooth tip, middle tooth and yoke part), and then evaluates the entire core loss through finite element analysis results. In order to verify the method, a prototype was manufactured. The experimental results show good performance of the proposed method of this paper. It provides reference for selecting the appropriate rotor structure and designing the corresponding PMSM according to different specification.

中文翻译：

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一种预测转子结构对永磁同步电机铁损的影响的新方法

永磁同步电机（PMSM）由于功率密度高，效率高等优点而被广泛使用。除绕组损耗外，铁损是PMSM总损耗的重要组成部分。因此，在根据实际研究应用设计永磁同步电动机时，有必要考虑铁损。本文以四种典型的转子结构（表面安装，嵌入式，“-”形，“ V”形）为例，提出了一种分析方法来预测不同转子结构对永磁同步电机磁芯损耗的影响。在定子和绕组结构相同的情况下，由于转子结构对磁路的影响，研究了定子铁芯中磁场的相应变化规律。该方法分析了四个代表点（定子齿尖，中齿和轭部）的磁通密度矢量的径向和切向分量，然后通过有限元分析结果评估了整个铁心损耗。为了验证该方法，制造了原型。实验结果表明本文提出的方法具有良好的性能。它为选择合适的转子结构以及根据不同规格设计相应的PMSM提供参考。