Comparison of different synchronous machines with stator‐side permanent magnets for industrial drive application

Abstract

This paper compares three different permanent magnet synchronous machines (Doubly-Salient-Permanent-Magnet- (DSPM), Flux-Reversal-Permanent-Magnet- (FRPM), Flux- Switching-Permanent-Magnet-Machine (FSPM)) with the permanent magnets in the stator of the machine for use as an industrial drive for 400 V Y, 45 kW and 1000 ... 3000 min-1. The machines are compared based on the magnetic co-energy and Finite-Element-Method-Simulations regarding the torque density. The results show that the FSPM provides the highest torque density of the three machines. Therefore, a FSPM prototype was built, tested on a test bench, and finally compared with an already built conventional permanent magnet synchronous machine (PMSM) of the same size (stator outer diameter dso = 314 mm, axial length lFe = 180 mm) and rating with surface-mounted rotor magnets. These measurements show that the conventional PMSM and the FSPM machine are roughly equivalent in their electrical behaviour.