PREDICTIVE TORQUE CONTROL FOR A POWER TOOL

Abstract: a fastener driver includes a motor, a trigger, and a lifting assembly operable to be moved by the motor. the fastener driver includes a speed sensor, a voltage sensor, and a current sensor. a controller is configured to provide, in response to actuation of the trigger, power to the motor, receive speed signals from the speed sensor indicative of the speed of the motor, receive voltage signals from the voltage sensor indicative of the voltage of a battery pack, and receive current signals from the current sensor indicative of the current of the motor. the controller determines a torque of the motor based on the signals, determines whether the torque of the motor is less than or equal to a torque threshold, and activate an electronic clutch, in response to the torque of the motor being less than or equal to the torque threshold, to electronically brake the motor.

Inventor(s): Kirat S. Mokha, Mitchell A. Ellena

CPC Classification: B25C1/06 (HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS (for shoemaking ))

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