AC motor control

Details AC motor control AC motor control

1990-04-05

1991-06-04

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Reversing

318754, H02P 320

Patent

active

050217232

ABSTRACT:
An AC motor control system and process useful in such AC motor applications as elevators, storage retrieval machines, cranes and hoists, and other load-carrying and work performing machinery.
Two identical and electrically isolated windings are utilized in an AC motor with the current to each winding being controlled through an SCR bank. A first winding, when energized, sets up an electromagnetic field which drives the rotor in a clockwise. A second winding, when energized, drives the rotor in a counterclockwise direction.
The use of two separate motor windings eliminates line-to-line electrical short circuit problems so that expensive lock-out circuits, circuit breakers, current feedback detectors and air chokes are no longer required.

REFERENCES:
patent: 1313688 (1919-08-01), Henderson
patent: 2519356 (1950-08-01), Curry, Jr.
patent: 2847630 (1958-08-01), Holt et al.
patent: 4196375 (1980-04-01), Findelsen
patent: 4438382 (1984-03-01), Vucovich et al.
patent: 4695782 (1987-09-01), Jatnleks
patent: 4712054 (1987-12-01), Boldt

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