Motor stoppage detection using back emf voltage

Details Motor stoppage detection using back emf voltage Motor stoppage detection using back emf voltage

H - Electricity

02

P

318/85

H02P 3/18 (2006.01)

Patent

CA 1295660

Abstract of the Invention An AC electric motor can be braked by applying current pulses to the motor when the polarity of the supply voltage is opposed to the polarity of the back electromotive force (emf) voltage across a stator coil of the motor. This cur- rent application continues until the motor has stopped. The stoppage is detected by sensing when the current is being applied during every cycle of the supply voltage. There- after, the polarity pattern of back emf voltage induced across each of the motor stator coils is sensed. The occur- rence of a back emf voltage polarity, pattern that remains unchanged for a given number of cycles is detected. There- after, a change in this pattern is sensed and the braking current application either ceases or continues for an ad- ditional predetermined interval.

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