Multi-speed motor control
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United States of America Patent
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N/A
Issued Date -
Aug 9, 2001
app pub date -
Mar 9, 2001
filing date -
Mar 9, 2000
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A motor speed control circuit generates a half cycle waveform and applies the half-cycle waveform to the motor at a controlled frequency to achieve speed reduction in the motor without motor modification. The circuit includes a rectifier bridge electrically connected to a power source and the motor terminals, a polarity sensing circuit electrically connected to the power source, a frequency reducing circuit coupled to the polarity sensing circuit and a bridge enabling circuit coupled to the frequency reducing circuit and to the rectifier bridge. For example, a one speed induction motor can effectively operate at two speeds using the c
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