US 11,926,031 B2
Electric work machine
Akihiro Nakamoto, Anjo (JP); and Hitoshi Suzuki, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Appl. No. 17/418,595
Filed by MAKITA CORPORATION, Anjo (JP)
PCT Filed Dec. 20, 2019, PCT No. PCT/JP2019/050169
§ 371(c)(1), (2) Date Jun. 25, 2021,
PCT Pub. No. WO2020/137907, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-242995 (JP), filed on Dec. 26, 2018.
Prior Publication US 2022/0072694 A1, Mar. 10, 2022
Int. Cl. H02P 23/20 (2016.01); B25F 5/00 (2006.01); H02P 6/24 (2006.01)
CPC B25F 5/00 (2013.01) [H02P 6/24 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electric work machine comprising:
a battery;
a motor;
a motor drive circuit configured to (i) convert electric power of the battery into three-phase power and (ii) supply the three-phase power to the motor, in response to receiving a drive command;
a rotary blade configured to be rotated by the motor;
a handle configured to be gripped by a user of the electric work machine;
a trigger comprising a first trigger switch and a second trigger switch, and configured to be on-operated or off-operated by the user,
the first trigger switch being configured to be turned off in response to the trigger being on-operated and to be turned on in response to the trigger being off-operated, the first trigger switch being configured to output a first switch information indicating whether the first trigger switch is turned on or off,
the second trigger switch being configured to be turned on in response to the trigger being on-operated and to be turned off in response to the trigger being off-operated, the second trigger switch being configured to output a second switch information indicating whether the second trigger switch is turned on or off; and
a control circuit configured to execute a motor control process in accordance with a computer program, the control circuit being configured to receive the first switch information and the second switch information, and the motor control process including:
outputting the drive command in response to (i) the first switch information indicating that the first trigger switch is turned off and (ii) the second switch information indicating that the second trigger switch is turned on; and
stopping the output of the drive command in response to (i) the first switch information indicating that the first trigger switch is turned on and (ii) the second switch information indicating that the second trigger switch is turned off.