Analysis of ninephase induction motor under unbalanced supply
ZHENG Yu1, KANG Min1，2
(1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;
2.College of Automation and Electrical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023,China)
Abstract:  The motor is supplied by an inverter,which may  be excepted to be wellbalanced. However a voltage mismatch is measured between phases on the experimental system which would influence the performance of motor.Aiming at this problem, the multiphase concentrated fullcoil winding induction motor was analyzed under unbalanced supply. A finite element analysis was used to calculate and analyze a nine phase motor under unbalanced supply,and the performances was compared.The results indicate that the performance of multiphase induction motor under unbalanced supply will be different from balanced supply,especially in the phase current and the torque ripple.It will produce positive sequence voltage and negative sequence voltage which will influence the phase current and torque ripple.
Key words: unbalanced supply ; multiphase induction motor; concentrated fullcoil winding