Permanent magnet (PM) brushless machines having magnets and windings in stator (the so-called stator-PM machines)have attracted more and more attention in the past decade due to its definite advantages of robust structure, high power density, high efficiency, etc. In this paper, an overview of the stator-PM machine is presented, with particular emphasis on concepts, operation principles, machine topologies, electromagnetic performance, and control strategies. Both brushless ac and dc operation modes are described. The key features of the machines, including themerits and drawbacks of the machines, are summarized.Moreover, the latest development of the machines is also discussed.

磁通切换永磁电机具有功率密度高、输出转矩大、反电动势正弦等优点，而较高的气隙磁密与定转子双凸极结构会产生较大的定位力矩。定位力矩会引起电机运行时的转矩脉动、振动和噪声问题，从而限制了磁通切换永磁电机的应用。从控制角度出发，提出一种新型的采用电流谐波注入法补偿定位力矩的控制策略，即通过注入谐波电流产生的转矩抵消定位力矩中的基波与二次谐波分量，从而达到补偿的目的。通过半实物仿真平台dSPACE实现了该控制算法，并在一台2kW磁通切换永磁电机的驱动系统上验证了所提出补偿控制方法的有效性。该控制方法也可拓展应用到其它反电动势为正弦且定位力矩较大的永磁电机驱动系统。

In this paper, magnetic field analysis of a new doubly salient permanent magnet (DSPM) motor is carried out based on finite element method (FEM). Hence, the corresponding static characteristics, including PM flux linkage, self-inductance, mutual inductance, and static torque are deduced (the interaction between the PM field and armature field are taken into account). New methods for measuring the motor inductance are also proposed. The theoretical analysis is verified by experimental results.