US 12,220,790 B2
Impact tool, method for controlling the impact tool, and program
Masayuki Nakahara, Osaka (JP); Takashi Kusagawa, Osaka (JP); and Takahiro Ueda, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/774,014
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Oct. 14, 2020, PCT No. PCT/JP2020/038841
§ 371(c)(1), (2) Date May 3, 2022,
PCT Pub. No. WO2021/100368, PCT Pub. Date May 27, 2021.
Claims priority of application No. 2019-211832 (JP), filed on Nov. 22, 2019.
Prior Publication US 2022/0379445 A1, Dec. 1, 2022
Int. Cl. B25B 21/02 (2006.01)
CPC B25B 21/02 (2013.01) 14 Claims
OG exemplary drawing
 
1. An impact tool comprising:
a motor;
a control unit configured to perform vector control on the motor, wherein the vector control comprises breaking down a current supplied to the motor into two current components of an excitation current that generates a magnetic flux and a torque current that generates a torque, and controlling the two current components independently of each other to control the motor;
an output shaft configured to be coupled to a tip tool;
a transmission mechanism including an impact mechanism and configured to transmit motive power of the motor to the output shaft, the impact mechanism being configured to perform an impact operation of applying impacting force to the output shaft according to magnitude of torque applied to the output shaft; and
an impact detection unit configured to determine, based on at least one of the excitation current or the torque current, whether or not the impact operation is being performed,
the control unit having an impact response function, the control unit fulfilling the impact response function by performing restriction processing in response to detection of the impact operation by the impact detection unit as a trigger,
the restriction processing including at least one of lowering a number of revolutions of the motor or stopping rotating the motor.