CONTROLLING METHOD OF ELECTRIC TOOL AND ELECTRIC TOOL CARRYING OUT THE CONTROLLING METHOD

摘要

An electric tool includes a motor for driving a working head to rotate at a rotation rate; a power source for supplying the motor current; a sensor for measuring the current; a controlling component for sensing the variance ratio of the current relative to the time, accordingly generating a controlling signal to reduce the rotation rate of the motor. A electronic controlling component added in the electric tool senses the working component which is driving by the working head whether has reached at the predetermination location automatically, and carries out corresponding action after the working component has been sensed reached at the predetermination location, ensures it will not cross the predetermination location further.