Electric power tool and motor control method thereof

摘要

An electric power tool (10) is provided with: a motor (14); a hydraulic pressure generator (18) driven by the motor (14) and configured to generate a plurality of impacts in one revolution thereof; an impact angle detector configured to detect an impact angle in one impact of the hydraulic pressure generator (18); an electric current detector (34) configured to detect an electric current applied to the motor (14); a determination unit configured to determine an impact failure based on the impact angle and the electric current detected by the impact angle detector and the electric current detector (34); and a rotation controller (46) configured to decrease a rotation speed of the motor (14) when the determination unit determines the impact failure.