Document Type and Number:
Japanese Patent JPH0227919
Kind Code:
B2
Abstract:
PURPOSE:To obtain uniform generating force without irregularity by partly modulating the power which is supplied to a coil, thereby cancelling the variation in the place of a field magnetic flux. CONSTITUTION:A current converter 9 compares the instruction signal 17 with the voltage value of a voltage power source 18 and outputs a current which corresponds to the difference. A similar current generator 10 responses to the output current of a current converter 19 and outputs a current which is determined at the relative ratio. A modulator 22 outputs an output signal which is modulated from the similar current in response to the modulation signal which is produced by a modulation signal generator 21. The similar current and the modulated current are synthesized by a synthesizer 23, and the current which corresponds to the output signal of the synthesizer is supplied to the coils 14-16 through a power supply unit 24.
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Inventors:
GOTO MAKOTO
ARAI KAZUO
ARAI KAZUO
Application Number:
JP7502082A
Publication Date:
June 20, 1990
Filing Date:
May 04, 1982
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H02P6/10; H02P6/06; H02P6/08; H02P6/28; H02P7/288
Next Patent: JPH0227920