Overview of Stator-Permanent Magnet Brushless Machines

Ming Cheng, Senior Member, IEEE, Wei Hua, Member, IEEE, Jianzhong Zhang, Member, IEEE, and Wenxiang Zhao, Member, IEEE

Abstract—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 ma- chine is presented, with particular emphasis on concepts, opera- tion principles, machine topologies, electromagnetic performance, and control strategies. Both brushless ac and dc operation modes are described. The key features of the machines, including the mer- its and drawbacks of the machines, are summarized. Moreover, the latest development of the machines is also discussed.