Gearless and small motors operating at speeds above 10 000 rpm are finding many applications nowadays. Axial flux permanent magnet (AFPM) motors are compact and lightweight compared to radial flux motors and hence, are considered for various high-speed applications. Eliminating the stator core minimizes the associated high-frequency losses, and hence, coreless AFPM motor can be an option for high-speed applications. Furthermore, the coreless AFPM motor design minimizes the cogging torque and the axial attraction force between the stator core and the rotor magnets. However, the reduction of flux linkage in the stator windings is a challenge in coreless AFPM motor. In this article, the advantages and disadvantages of the printed circuit board (PCB)-based AFPM motor for high-speed, low-power applications are investigated. A detailed performance comparison of the PCB-based coreless AFPM motor and the AFPM motor with the laminated stator core is made. Finite-element analysis is carried out for the electromagnetic, mechanical, and thermal comparison of the two motors and the simulation results are presented. Finally, motor prototypes are fabricated and are tested to ascertain the simulation results.

中文翻译：

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用于高速低功耗应用的轴向磁通永磁电机 PCB 定子和基于叠片铁芯定子设计的性能比较


如今，运行速度超过 10 000 rpm 的无齿轮小型电机得到了许多应用。与径向磁通电机相比，轴向磁通永磁 (AFPM) 电机结构紧凑、重量轻，因此被考虑用于各种高速应用。消除定子铁芯可最大限度地减少相关的高频损耗，因此，无铁芯 AFPM 电机可以成为高速应用的选择。此外，无铁芯 AFPM 电机设计最大限度地减少了定子铁芯和转子磁体之间的齿槽扭矩和轴向吸引力。然而，减少定子绕组中的磁链是无芯 AFPM 电机的一个挑战。在本文中，研究了基于印刷电路板 (PCB) 的 AFPM 电机在高速、低功耗应用中的优点和缺点。对基于 PCB 的空心杯 AFPM 电机和叠片定子铁芯 AFPM 电机进行了详细的性能比较。对两种电机的电磁、机械和热比较进行了有限元分析，并给出了仿真结果。最后，制造电机原型并进行测试以确定仿真结果。