Doubly salient permanent-magnet machine with skewed rotor and six-state commutating mode

We propose new concepts for the design, optimization, and control of a doubly salient permanent-magnet machine (DSPM). We employ a uniform pole width so that the width of the rotor pole is the same as that of the stator salient pole. This design aims to minimize the cogging torque. Second, we used a skewed rotor with one-half the pole width to improve the commutation. Finally, based on the flux linkage of the skewed rotor, we used a six-state commutating mode to control the motor. We validated the feasibility of these new design concepts by simulations, field analysis, and experimental measurements of the prototype.