METHOD FOR CONTROLLING ELECTRIC POWER TOOL

摘要

Provided is a method of controlling an electric power tool which has an electric motor disposed therein and tightens a nut by controlling electric current supplied to the electric motor, the method comprising: a step of seating the nut; a step of determining whether a rotational speed of the electric motor reaches a predetermined speed Vt at the time of seating; a 1-1st control step of gradually decelerating the speed Vt by supplying a brake current to the electric motor when the speed Vt is reached in the determining step; and a second control step of, when the speed Vt is not reached, intermittently supplying a square wave current whose magnitude gradually increases, after stopping the supply of the current to reduce the rotational speed to zero.