Electricity: motive power systems – Positional servo systems – With stabilizing features
Reexamination Certificate
2006-12-19
2006-12-19
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Positional servo systems
With stabilizing features
C318S375000, C318S376000, C318S599000, C318S611000, C318S629000, C318S632000, C318S801000, C318S805000, C318S806000, C318S807000, C318S811000
Reexamination Certificate
active
07151354
ABSTRACT:
The invention provides techniques for reducing or altering the magnetic noise of an AC rotary electric machine. A magnetic noise reducing harmonic current of order n, whose frequency is n times the frequency of the fundamental frequency component of a polyphase AC current fed to an armature of a polyphase AC rotary electric machine, is superimposed on the polyphase AC current, thereby reducing or altering a harmonic component having a frequency (n−1) times the frequency of the fundamental frequency component and occurring due to a radial magnetic excitation force acting radially on an iron core of the AC rotary electric machine. Magnetic noise is caused by a vibration whose energy is the sum of the circumferential and radial vibrations of the iron core occurring due to the magnetomotive force of the rotor, and altering the radial vibration is particularly effective in altering the magnetic noise; as the harmonic component of the radially acting magnetic excitation force, occurring due to harmonic components having frequencies 3, 5, 7, and 13 times the fundamental frequency, has a frequency 6 or 12 times the fundamental frequency, the magnetomotive force of the rotor can be effectively reduced or altered when a current having a frequency 7 or 13 times the fundamental frequency is superimposed on the stator current.
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Morioka Tatsuru
Okamura Makoto
Takai Takatoshi
Tsuji Hiroya
Wakabayashi Ken-ichi
Denso Corporation
Donovan Lincoln
Glass Erick
Oliff & Berridg,e PLC
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