Inverter apparatus

Details Inverter apparatus Inverter apparatus

2003-09-30

2008-10-14

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C318S432000, C318S727000

Reexamination Certificate

active

07436144

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.

REFERENCES:
patent: 5481166 (1996-01-01), Moreira
patent: 6097171 (2000-08-01), Branecky
patent: 6462492 (2002-10-01), Sakamoto et al.
patent: 2001/0008371 (2001-07-01), Norrkniivila et al.
patent: 1-303063 (1989-12-01), None
patent: 4-172972 (1992-06-01), None
patent: 6-22556 (1994-01-01), None
patent: 2001-197725 (2001-07-01), None

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