A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source...http://www.google.fr/patents/US6696814?utm_source=gb-gplus-shareBrevet US6696814 - Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
Microprocessor for controlling the speed and frequency of a motor shaft in a ...
