Digital control system for electric motors in power tools...

H - Electricity – 02 – P

Patent

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318/50, 341/93,

H02P 23/00 (2006.01) H02H 6/00 (2006.01) H02H 7/085 (2006.01) H02P 25/14 (2006.01)

Patent

CA 1155950

ABSTRACT A digital control system for electric motors in power tools of the portable or stationary type includes a microcomputer controlled speed regulator connected to the electric motor for maintaining a preselected speed of the motor substantially constant between no load and full load operation of the motor. The preselected speed is inputted to the microcomputer by means of a rotary switch or similar input switching arrangement. When the tool is just starting or the operator changes the speed switch, the microcomputer controls the speed of the motor to slowly approach the desired speed. The microcomputer is programmed to detect an overload condition and activate an alarm, and an impending kickback condition and stop the electric motor.

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