Hitachi Koki Co., Ltd.

Nobihiro Takano

Eiji Nakayama

Yoshikazu Kawano

Kenro Ishimaru

Kazumi Tanaka

Masahiro Isono

According to an aspect of the present invention, there is provided a power tool including: a motor; a switching device that switches over, in response to a conduction angle thereof, an AC voltage to be applied to the motor; a rotation speed setting unit that sets a target rotation speed of the motor; a rotation speed detection unit that detects an actual rotation speed of the motor; and a controller that determines the conduction angle by comparing the actual rotation speed with the target rotation speed and that controls the switching device by use of the conduction angle based on a maximum conduction angle, the maximum conduction angle being set in accordance with the target rotation speed.

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Ibaraki, Japan

Nobihiro Takano