Method and device for speed control of an induction motor

Details Method and device for speed control of an induction motor Method and device for speed control of an induction motor

1997-01-16

1998-06-09

Ip, Paul

Electricity: motive power systems

Induction motor systems

318768, 318772, 318786, 318805, H02P 126

Patent

active

057640211

ABSTRACT:
A method and device are disclosed for speed control of an AC induction motor by means of a control circuit which generate a motor drive voltage consisting of a combination of AC and time-spaced DC pulses. During the occurrence of the time-spaced DC pulses in the motor's AC drive voltage a back EMF suppression network is activated to absorb the motor's generated back EMF energy. A further feature of the invention is a slow down mode where the motor is decelerated from continuous full cycle AC to a requested slow speed setting by means of a higher contend of DC pulses in the AC drive voltage.

REFERENCES:
patent: 4489263 (1984-12-01), Potter et al.
patent: 4791341 (1988-12-01), Brown et al.
patent: 4996470 (1991-02-01), Rowan et al.
patent: 5187419 (1993-02-01), DeLange
patent: 5510687 (1996-04-01), Ursworth et al.
patent: 5670858 (1997-09-01), Heath

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