US 12,304,038 B2
Electric tool and control method thereof
Po-Kai Dai, Pingtung County (TW); and Wei-Hsiu Li, Taichung (TW)
Assigned to MOBILETRON ELECTRONICS CO., LTD., Taichung (TW)
Filed by MOBILETRON ELECTRONICS CO., LTD., Taichung (TW)
Filed on Dec. 18, 2023, as Appl. No. 18/542,784.
Claims priority of application No. 112100424 (TW), filed on Jan. 5, 2023.
Prior Publication US 2024/0227137 A1, Jul. 11, 2024
Int. Cl. B25B 21/02 (2006.01); B25B 23/147 (2006.01); H02P 1/02 (2006.01); H02P 6/08 (2016.01); H02P 6/15 (2016.01); H02P 6/30 (2016.01); B25F 5/00 (2006.01); H02P 6/17 (2016.01); H02P 6/28 (2016.01)
CPC B25B 23/147 (2013.01) [B25B 21/02 (2013.01); H02P 1/02 (2013.01); H02P 6/08 (2013.01); H02P 6/15 (2016.02); H02P 6/30 (2016.02); B25F 5/008 (2013.01); H02P 6/17 (2016.02); H02P 6/28 (2016.02)] 24 Claims
OG exemplary drawing
 
13. A control method of an electric tool, wherein the electric tool comprises a motor, a drive shaft, a torque sensing module, and a control device; the motor has a rotating shaft; the drive shaft is coupled to the rotating shaft; the torque sensing module is adapted to sense a torque on the drive shaft; the control device is electrically connected to the motor and the torque sensing module; the control method comprises steps of:
A. driving the motor to rotate the rotating shaft in a direction of rotation through the control device;
B. driving the motor in a plurality of first start-stop cycles through the control device when the control device determines that an increase in the torque sensed by the torque sensing module occurs, wherein each of the plurality of first start-stop cycles has a first cycle time; the first cycle time includes a first enabling time and a first ending time; the control device drives the motor to rotate the rotating shaft during the first enabling time and stops the rotating shaft of the motor from rotating during the first ending time; the plurality of first cycle time of the plurality of first start-stop cycles gradually increase, and the plurality of first enabling time of the plurality of first start-stop cycles gradually increase;
C. driving the motor in a plurality of second start-stop cycles through the control device when the control device determines that the torque sensed by the torque sensing module has increased to a first predetermined torque and is less than a second predetermined torque, wherein each of the plurality of second start-stop cycles has a second cycle time; the second cycle time includes a second enabling time and a second ending time; the control device drives the rotating shaft of the motor to rotate during the second enabling time and stops the rotating shaft of the motor from rotating during the second ending time; the plurality of second cycle time of the plurality of second start-stop cycles remain fixed, while the plurality of second enabling time of the plurality of second start-stop cycles gradually increase and the plurality of second ending time of the plurality of second start-stop cycles gradually decrease.