Vibration Analysis of a Nine-Phase Induction Machine Supplied by Voltage with Harmonics Injection

The paper deals with magnetic forces and vibration analysis of a nine-phase induction motor. It is described a method of voltage harmonics injection for reaching either the same amplitude or RMS value of supplying voltage as for the case of supplying the motor using the voltage fundamental only. Influence of the both types of voltage harmonics injection on the magnetic forces and motor vibration is evaluated using finite element analysis and compared to the motor supply by sinusoidal voltage.