Speed control apparatus for polyphase induction motors

Details Speed control apparatus for polyphase induction motors Speed control apparatus for polyphase induction motors

1983-11-14

1984-11-20

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318806, 318801, H02P 540

Patent

active

044841299

ABSTRACT:
In a speed control system of a three phase induction motor, a resolver is connected to the rotor of the motor for producing a phase modulated signal Esin (.omega.t+.theta.) containing the rotational angle .theta.. This signal is converted into a speed signal K.sub.2 E(d.theta./dt) which is compared with a speed instruction signal to produce an error signal. The error signal is multiplied with the phase modulated signal and the product is rectified with three synchronous rectifier units respectively controlled by three reference signals having phase differences of 0, 2.pi./3 and 4.pi./3 for producing three phase voltages applied to the stator winding of the induction motor. The control system enables to control the speed while maintaining the slip frequency at a constant value.

REFERENCES:
patent: 4357569 (1982-11-01), Iwakane et al.
patent: 4358726 (1982-11-01), Iwakane et al.

Affiliated with

Also associated with

Rating

Speed control apparatus for polyphase induction 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 Speed control apparatus for polyphase induction motors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speed control apparatus for polyphase induction motors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2191131