Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Manabu Yoshimura0
Toshiyuki Kaitani0
Date of Patent
October 14, 2008
0Patent Application Number
105738580
Date Filed
September 30, 2003
0Patent Primary Examiner
Patent abstract
A CPU calculates, based on a frequency command value for driving a motor and on a state quantity of the motor, an output-voltage command value in which only the phase advances while amplitude is constant in each calculation period, without reducing the calculation period. An ASIC reflects the output-voltage command value in a triangular wave signal in a time-series order to compare with each other, and outputs a PWM signal to a switching circuit. Thus, a waveform of an output voltage is made close to a sine wave irrespective of an output frequency being high or low, and a processing load of the CPU is reduced.
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