Analysis and experimental verification of dual star permanent magnet synchronous motor with rotor back iron made of soft magnetic composite

摘要

The research conducted at Poznan University of Technology with cooperation the Tele- and Radio Research Institute deals with finite element analysis of six-phase, dual star permanent magnet synchronous motor. To reduce eddy current losses in the rotor of the machine the rotor back iron segments have been made of soft magnetic composite (SMC). SMC are composites of iron powder particles separated with an electrically insulated layer. This technology has many advantages in relation to classical laminated core solutions; among other lower manufacturing costs due to simpler technology and reduced eddy current losses out of order times lower conductivity. The mathematical model of machine utilizes field circuit approach assuming planar symmetry of the machine. The magnetic properties of the applied SMC material have been introduced into the model basing on BH curves and unit losses vs. frequency characteristics measured at Tele- and Radio Research Institute. Accuracy of developed numerical model has been verified by measurements of the machine performance under normal and drive fault conditions tested on the elaborated research stand.