Wide range, self-starting single phase motor speed control
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United States of America Patent
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-
Sep 18, 1990
Grant Date -
N/A
app pub date -
Aug 28, 1989
filing date -
Aug 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A speed control circuit (50) for a single phase AC induction motor (12) includes a phase control circuit (10) for connecting a main winding (16) to an AC source (18) at a variable time delay phase angle during the half cycle of the AC source, and a boost circuit (52) including a motor speed sensor (54, 56) sensing motor speed and altering the delay interval phase angle in response thereto. The boost circuit shortens the delay interval in response to decreasing motor speed, and lengthens the delay interval in response to increasing motor speed, such that almost full voltage is applied during starting of the motor, which voltage is reduced as the motor begins running.
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