Control apparatus for AC motors

Details Control apparatus for AC motors Control apparatus for AC motors

1983-09-07

1985-05-07

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, H02P 540

Patent

active

045160651

ABSTRACT:
When driving an AC motor with a PWM inverter, the width of a speed command signal is modulated by a carrier to produce width modulated pulses for controlling main switching elements. The width modulated pulses are liable to be attended with impulses which cause magnetic vibrations in the AC motor, resulting in noises. The generation of these impulses can be suppressed by changing the amplification factor of an amplifier for the speed command signal or the amplitude of the carrier on the basis of the rate of change of the speed command signal. Noises which would be attendant 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 revolution of the AC motor during low speed running.

REFERENCES:
patent: 3859585 (1975-01-01), Meier
patent: 4306182 (1981-12-01), Curtiss
patent: 4348627 (1982-09-01), Fulton
patent: 4354223 (1982-10-01), Turnbull
patent: 4377779 (1983-03-01), Plunkett

Affiliated with

Also associated with

Rating

Control apparatus for AC motors does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control apparatus for AC motors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control apparatus for AC motors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1802313