This article presents a new pole-changing (PC) doubly salient permanent magnet (DSPM) motor. According to the general air-gap field modulation theory (GAFMT), the permanent magnet excitation field can be modulated by the stator and rotor teeth to a series of harmonics with different pole-pair numbers and different slot pitch angles. Thus, when the armature winding is connected and reconnected according to the different excitation field harmonics, the PC operation can be realized to obtain a high torque density at the low-speed region and a widened speed regulation range with a simple motor structure. According to the GAFMT, the operating principle of the proposed motor is introduced, and the winding connection is discussed. Then, to verify the validity, the electromagnetic performance of the proposed motor is analyzed by the finite element analysis. Finally, a prototype is built and tested.

中文翻译：

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变极双凸极永磁电机


本文介绍了一种新型变极 (PC) 双凸极永磁 (DSPM) 电机。根据一般气隙磁场调制理论（GAFMT），永磁体励磁磁场可以通过定子和转子齿调制为一系列具有不同极对数和不同槽距角的谐波。这样，当电枢绕组根据不同的励磁场谐波接通和重接时，可以实现PC运行，以简单的电机结构获得低速区的高转矩密度和更宽的调速范围。根据GAFMT，介绍了所提出电机的工作原理，并讨论了绕组连接。然后，为了验证有效性，通过有限元分析对所提出的电机的电磁性能进行了分析。最后，构建并测试原型。