A novel wound eld ux switching machine with salient pole rotor and nonoverlapping windings

Abstract

A ux switching machine (FSM) with a segmented rotor and nonoverlapping windings is an attractive alternative for driving high torque density applications. However, a rotor with segments makes the motor less robust as well as difficult to be assembled, while a FSM with salient rotor and overlapping windings inherits high copper losses and less efficiency due to high coil volume. In this paper, a novel structure of FSM with nonoverlapping windings and salient rotor is proposed, making it different from the 10Slot-8Pole segmental and salient rotor FSM. Several design parameters de ned in the rotor, armature coil, and eld excitation coil are treated by the deterministic optimization approach until the target values are achieved and the performances are analyzed by two-dimensional nite element analysis. The optimized design has achieved average torque of 27.06 Nm and power of 6.83 kW at armature current density, J a , of 30 A rms /mm 2 and maximum eld current density, J e , of 30 A/mm 2 , which is greater than the 10Slot-8Pole segmental rotor and salient rotor FSM. Wound eld FSMs with salient rotor and nonoverlapping windings should be considered as promising candidates for hybrid electric vehicles and all-electric boats due to their high torque density, robust rotor, and fewer losses.