Brushless motor lock detection apparatus

Details Brushless motor lock detection apparatus Brushless motor lock detection apparatus

1994-09-30

1996-11-12

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 31, 318798, H02H 504

Patent

active

055746080

ABSTRACT:
A brushless motor lock detection apparatus for detecting a locked condition of a rotor of a brushless motor includes a pulse generator for generating pulses synchronized to the rotation of the rotor, a capacitor for charging a current during motor being locked, a control circuit for monitoring the charge in the capacitor, and a flip-flop circuit. The control circuit produces a lock detection signal when the charge in the capacitor reaches a predetermined level, and cuts off power to the motor. After a while, the control circuit starts to supply power to the motor. The flip-flop circuit produces a locked state signal which starts in response to the lock detection signal and ends in response to the pulse.

REFERENCES:
patent: 3839661 (1974-10-01), Wada
patent: 4030005 (1977-06-01), Doemen

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