Patent ID: 7151354
Filing Date: 2006-12-19
Classification: H02J,H02K,H02M,H02P,Y02E

Abstract:
1. A magnetic noise reduction method for an AC rotary electric machine, wherein a radial vibration reducing harmonic current, whose frequency is n times (n is a natural number) the frequency of the fundamental frequency component of a polyphase AC current fed to an armature of a polyphase AC rotary electric machine, is input into said armature by superimposing the radial reducing harmonic current on said polyphase AC current, thereby attenuating an (n−1)th harmonic component, having a frequency (n−1) times the frequency of said fundamental frequency component, that is contained in a radial vibration occurring radially about an axial center of a rotating shaft of said AC rotary electric machine due to an excitation force generated by said AC rotary electric machine or externally applied to said AC rotary electric machine.