AC motor driving apparatus and control method

Details AC motor driving apparatus and control method AC motor driving apparatus and control method

2007-03-26

2011-12-13

Santana, Eduardo Colon (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C318S700000

Reexamination Certificate

active

08076890

ABSTRACT:
Provided is an AC motor driving apparatus and an AC motor control method capable of utilizing the conventional PWM system as-is even in an ultra-compact AC motor having an extremely few turns of exciting coil and preventing occurring of vibration and noise. The AC motor driving apparatus has an inverter converting a DC voltage to an AC voltage and supplying the AC voltage to an AC motor; a PWM device controlling a magnitude and a frequency of an output voltage of the inverter and means for changing a time constant of the AC motor in accordance with a carrier frequency of the PWM device. Between the PWM device and the AC motor, there is provided a condenser and/or a coil for adjusting the time constant, and the capacity thereof is adjusted in accordance with the carrier frequency of the PWM device.

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Notification of Transmittal of Translation of the International Preliminary Report on Patentability (Form PCT/IB/338) of International Application No. PCT/JP2007/056261 mailed Oct. 30, 2008 with Forms PCT/IB/373 and PCT/ISA/237.
International Search Report of PCT/JP2007/056261, date of mailing Jun. 19, 2007.

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