IE5 Energy-Efficiency Class Synchronous Reluctance Motor With Fractional Slot Winding

Abstract

This paper considers an optimization of the IE5 four-pole synchronous reluctance motor of a new design. The motor has an original rotor design and a stator with a fractional-slot winding (2.5 slots per pole and phase). The target parameters of optimization are the resulting efficiency of the motor at the fan load profile, the torque ripple, the required power of the frequency converter, and the total harmonic distortion of the supply voltage. The motor efficiency is much higher than the IE5 class requirement and remains high in wide range of powers at the fan load profile. Also, the motor has low torque ripple despite that its rotor and stator have no skewing.