Ultra Premium Efficiency (IE5 Energy-Efficiency Class) Synchronous Reluctance Motor with Fractional Slot Winding

The paper considers a design optimization of the 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 in the pump application, the torque ripple, the apparent power of the frequency converter and the total harmonic distortion of the supply voltage. The comparison of the calculated characteristics of the optimized design with the characteristics of a serially produced energy-efficient synchronous reluctance motor is given.