Method of detecting kickback condition in a motor driven tool

Details Method of detecting kickback condition in a motor driven tool Method of detecting kickback condition in a motor driven tool

H - Electricity

02

P

318/98

H02P 5/00 (2006.01) H02P 23/00 (2006.01) H02P 25/14 (2006.01)

Patent

CA 1257645

ABSTRACT A microprocessor based motor controller which provides open loop speed control at low conduction angles, closed loop speed control at high conduction angles, and a smooth transition between open loop and closed loop zones. In open loop, the motor speed is selected and is permitted to vary with applied load. In closed loop, the motor speed is held constant, substantially irrespective of load. In the transition zone, the motor is operated in a hybrid open loop, closed loop fashion. Anti-kickback protection is also provided based on a percentage change in the motor's rotational period.

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