Abstract: As a topology of novel brushless permanent magnet（PM） machines,stator-PM brushless machines having magnets and armature windings in stator（the so-called stator-PM machines）,exhibit the merit of convenient heat dissipations.The compact and robust rotor structure also makes stator-PM machines potential candidates for high speed applications.Meantime,the air-gap flux regulations can be realized by hybrid excitations of PMs and field windings,which consequently expands the speed adjustment regions.Overall,the stator-PM machine features the definite advantages of robust structure,high power density and efficiency,high fault-tolerant capability and being applicable of various control strategies.In this paper,a comprehensive and systematical overview on the stator-PM brushless machine systems and their key technologies is conducted,with particular emphasis on machine topologies,operation principles,design and analysis features,and control strategies.Furthermore,the fluxregulation strategies and fault-tolerant control strategies are presented.Some potentials of feasible applications for the stator-PM brushless machines in electrical vehicles,flywheel energy storage system,and urban rail transit,are discussed.Finally,the future trends are prospected.