摘  要：井下环境对发电机有一些特殊要求。永磁发电机体积小，能量密度大，适宜于井下运行。该文针对径向磁路和轴向磁路两种结构的永磁发电机进行了研究，通过磁场计算和样机测试，进行了结构和性能方面的对比。该文的工作对井下小型发电机的选用具有一定的指导意义。
关键词：永磁发电机；径向磁路；轴向磁路；整流

Abstract: Some special requirements are needed to the generators when used in wells.Permanent Magnet generators have smaller volumes, greater energy density, and are very suitable to be used in this area.Two structures of radial and axial magnetic circuit PM generators were studied in this paper, magnetic field calculation, prototype tests and characteristics comparison were brought.This paper has a engineering reference to the usage of small generators.
Key words: PM generator; radial magnetic circuit; axial magnetic circuit; regulation