Control apparatus for ac motors

Details Control apparatus for ac motors Control apparatus for ac motors

H - Electricity

02

P

318/103, 318/89

H02P 7/62 (1985.01)

Patent

CA 1204150

ABSTRACT OF THE DISCLOSURE When driving an AC motor with a PWM inverter, the width of a speed command signal is modulated by a carrrier to produce width modulated pulses for controlling main switching elements. The with modu- lated pulses are liable to be attended with impulses which cause magntic vibrations in the AC motor, resulting in noises. The generation of these impulses can be supressed by changing the amplification factor of an amplifier for the speed command signal or the ampli- tude of the carrier on the basis of the rate of change of the speed command signal. Noises which would atten- dant on low speed running of the AC motor can be reduced by changing the amplification factor of the amplifier and the amplitude of the carrier on the basis of detected frequency of the speed command signal or revo- lution of the AC motor during low speed running.

436184

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