Motor control apparatus

Details Motor control apparatus Motor control apparatus

2011-01-18

2011-01-18

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C388S804000, C388S812000

Reexamination Certificate

active

07872435

ABSTRACT:
A motor control apparatus provided with an inverter for successively commutating the current to a motor using a PWM signal; a PWM signal generating device for generating the PWM signal using a carrier signal; a rotational state quantity sensor for detecting a rotational state quantity; a phase difference detecting device for detecting the phase difference between the carrier signal and the rotational period based on the rotational state quantity; a frequency setting device for setting a frequency of the carrier signal to a value in accordance with a multiplier for one period in terms of electrical angle of the rotational period of the motor, when the rotational frequency is equal to or greater than a specified frequency and the phase difference is equal to or less than a specified value; and a synchronizing device for synchronizing a control period of the carrier signal to the rotational period.

REFERENCES:
patent: 5532569 (1996-07-01), Tanamachi et al.
patent: 7166975 (2007-01-01), Mori et al.
patent: 2005/0201129 (2005-09-01), Nakatsugawa et al.
patent: 2006/0184213 (2006-08-01), Griffith
patent: 05-161364 (1993-06-01), None
patent: 07-163189 (1995-06-01), None

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