Optimal Design and Performance Analysis of Dual-Stator Permanent Magnet Fault-Tolerant Machine

This article presents the optimal design of a dual-stator permanent magnet fault-tolerant machine (DSPMFTM). In order to enhance the torque density, the radial-flux dual-stator structure is expanded to redundant situation. The parallel rotor is proposed to add self-inductance for realizing limited short-circuit current, and thus, the deep and narrow notches (DNNs) are replaced with large-opening slots. The optimal design of DSPMFTM is raised in this article because of the more complexity of flux coming from the short distance between the reluctance part (RP) and the permanent magnet part (PMP). The influences of slot opening, separating distance between PMP and RP along with permanent-magnet shape, are considered. Also, the varieties of torque density, ratio of mutual inductance to self-inductance, and short-circuit current to rated value are examined. A prototype is designed and manufactured according to the optimization results. The experimental results are coincident with the simulations, indicating that the DSPMFTM has a better performance in torque density and fault tolerance.