Patent ID: 9692157
Date: 2017-06-27
CPC Classifications: B25F,G01R,H01H,H01M,H01R,H02J,H02P,H05B,Y02E,Y02P

Claim:
1. A method for operating a power tool having a motor powered by a battery pack, the method being executed via a controller residing in the power tool, the method comprising: setting the duty cycle of a pulse width modulated (PWM) control signal for driving the motor to a first PWM value in accordance with a desired rotational speed of the motor; delivering power from the battery pack to the motor in accordance with the control signal; monitoring a parameter associated with at least one of battery operation or tool operation while power is delivered from the battery pack to the motor; detecting a condition of the parameter indicative of a shutdown condition; and fading the power delivered from the battery to the motor, in response to the detected condition, wherein the fading step comprises: