Energy conserving electric induction motor field control method

Details Energy conserving electric induction motor field control method Energy conserving electric induction motor field control method

1990-11-07

1992-10-27

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318790, 318812, H02P 144

Patent

active

051592550

ABSTRACT:
An alternating current induction motor having a tapped RUN winding for developing different levels of stator field excitation which induces rotational torque into a rotor having an output member that drives various levels of mechanical load. Instant motor loading is sensed as a change in power factor or subsynchronous slip speed and the level of RUN winding excitation, together with the resulting magnetic field strength, is immediately changed to compensate for the sensed load changes. The change in RUN winding excitation is brought about by having a RUN winding the full extent of which may be coupled with a.c. power to produce magnetic field strength and resulting output member torque at least sufficient to operate the motor under minimum load conditions, and at least one tapped portion of the RUN winding which may be alternatively coupled with the a.c. power to produce an increased level of magnetic field strength necessary for operating the motor under maximal, or at least an increased level of motor loading.

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Book: "Modern Refrigeration and Air Conditioning" by Althouse, et al; published by The Goodheart-Wilcox Company, Inc.; South Holland, IL; pp. 218-219 and 261-262 as cited in text of specification.

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