Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-03-14
1996-01-09
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
361 24, H02P 100
Patent
active
054831393
ABSTRACT:
A single phase induction motor includes a start winding, a run winding coupled in parallel with the start winding, a start switch, and a run switch. A control circuit is provided for selectively supplying voltage to the start and run windings. A current sensor is coupled to the control circuit and the start and run windings for estimating the temperature rise of the motor and turning the motor off if overheated. An alternating voltage having a plurality of 360.degree. cycles can be continuously applied to the run winding through the run switch. The alternating voltage is repetitively applied through the start switch to the start winding in the range of 45.degree. to 135.degree. into each respective one of the plurality of cycles and ending at approximately 180.degree. into each respective cycle and beginning in the range of 225.degree. to 315.degree. into each respective cycle and ending at approximately 360.degree. into each respective cycle until the motor is running at a speed close to synchronous speed.
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Agosti Ann M.
General Electric Company
Snyder Marvin
Wysocki Jonathan
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