Electric motor starting circuit
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United States of America Patent
Stats
-
Oct 19, 1999
Grant Date -
N/A
app pub date -
Nov 25, 1998
filing date -
Feb 19, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric induction motor can be given a kick start without excessive current drain on the supply by first connecting a unidirectional supply to a winding of the motor to build up a stationary rotor flux and then applying a starting current to another winding of the motor to produce a stator flux at an appropriate angle (between 0.degree. and 180.degree.) with the stationary rotor flux. Once the motor has begun accelerating the normal running supply can be connected. This starting current may be derived from a capacitance which is charged up during the period of establishing the stationary rotor flux.
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