Variable speed motor control circuit
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United States of America Patent
Stats
-
Jul 24, 2007
Grant Date -
May 11, 2006
app pub date -
Oct 24, 2005
filing date -
Oct 22, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system and method for controlling the speed of a PSC motor having an auxiliary winding configured to provide torque for initial motor startup and a run winding configured to provide continuous motor operation. The motor is coupled to a capacitor configured to direct a portion of a current through the run winding when the PSC motor reaches its intended speed. The control system includes a speed control unit coupled between a voltage line and the PSC motor and a bypass circuit coupled between the voltage line and the capacitor via a first path. The speed control unit is configured to variably control the speed of the PSC motor. The bypass circuit is configured to receive a control signal from the speed control unit via a second path and to regulate a chopped voltage wave form generated by the speed control unit such that at least a portion of the chopped voltage wave form is not applied to the capacitor.
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