US 12,233,517 B2
Electric work machine
Itsuku Kato, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on Nov. 8, 2022, as Appl. No. 17/982,649.
Claims priority of application No. 2021-184131 (JP), filed on Nov. 11, 2021.
Prior Publication US 2023/0144684 A1, May 11, 2023
Int. Cl. B25B 23/147 (2006.01)
CPC B25B 23/147 (2013.01) 14 Claims
OG exemplary drawing
 
1. An electric work machine, comprising:
an output shaft (i) configured to be attached to a tool or (ii) connected to the tool;
a motor configured to drive the output shaft;
a trigger switch configured to be pulled by a user of the electric work machine to drive the motor;
a current measuring circuit configured to measure a current value, the current value corresponding to a magnitude of a drive current flowing through the motor; and
a controller configured to:
set a maximum value of a correction value, the correction value being for correcting a target parameter used for driving the motor;
calculate the correction value less than or equal to the maximum value so that the drive current decreases, in response to the current value measured by the current measuring circuit having reached a threshold, the threshold being maintained at a preset fixed value while the trigger switch is being pulled;
subtract the correction value calculated from the target parameter, thereby correcting the target parameter; and
drive the motor based on the target parameter corrected.