US 12,011,810 B2
Technique for controlling motor in electric power tool
Kunihisa Shima, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on Oct. 5, 2022, as Appl. No. 17/960,276.
Claims priority of application No. 2021-164979 (JP), filed on Oct. 6, 2021.
Prior Publication US 2023/0107745 A1, Apr. 6, 2023
Int. Cl. B25B 23/00 (2006.01); B25B 23/147 (2006.01); B25B 21/02 (2006.01)
CPC B25B 23/1475 (2013.01) [B25B 21/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electric power tool comprising:
a motor;
an output shaft configured (i) to be attached to a tip tool and (ii) to be driven with a rotational force of the motor;
a torque detector configured to detect a magnitude of a load torque, the load torque being applied to the motor;
a correction circuit configured to correct a drive command value based on the magnitude of the load torque detected, the drive command value indicating a magnitude of an electric power to be supplied to the motor, and
an output circuit configured to output a drive signal, the drive signal indicating the drive command value; and
a drive circuit configured (i) to receive the drive signal from the output circuit, and (ii) to supply, to the motor, the electric power in accordance with the drive signal to thereby drive the motor, the electric power having the magnitude corresponding to the drive command value indicated by the drive signal.