Multi-speed motor control

Details Multi-speed motor control Multi-speed motor control

H - Electricity

02

P

H02P 7/632 (2000.01) H02P 5/412 (2000.01)

Patent

CA 2340309

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 circuit.

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