Electricity: motive power systems – Induction motor systems – Braking
Patent
1989-02-15
1991-03-26
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Braking
318759, H02P 318
Patent
active
050032410
ABSTRACT:
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 current 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. Thereafter, the polarity pattern of back emf voltage induced across each of the motor stator coils is sensed. The occurrence of a back emf voltage polarity pattern that remains unchanged for a given number of cycles is detected. Thereafter, a change in this pattern is sensed and the braking current application either ceases or continues for an additional predetermined interval.
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Merrison John C.
Rowan Timothy M.
Allen-Bradley Company Inc.
Smith Jr. David
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