ABSTRACT
Permanent-magnet synchronous machines are the high-performance electromechanical motion devices which possess superior performance and capabilities surpassing any other electric machines such as permanent-magnet DC electric machines, induction motors, and so on. In addition, conventional synchronous machines are utilized. In synchronous motors, the electromagnetic torque results as a result of the interaction of time-varying magnetic field established by the stator windings and stationary magnetic field produced by the windings or magnets on the rotor. In addition, there exist synchronous reluctance machines that exhibit, in general, low performance. In synchronous reluctance motors, the electromagnetic torque is produced to align the minimum-reluctance path of the rotor with the time-varying rotating airgap mmf.
