Patent ID: 11958173
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A method for controlling an impact tool, the impact tool including:
a motor;
a control unit configured to perform vector control on the motor;
an output shaft configured to be coupled to a tip tool; and
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,
the method including:
impact detection processing including determining, based on at least one of an excitation current to be supplied to the motor or a torque current to be supplied to the motor, whether or not the impact operation is being performed,
a first control including placing a limit on an increase in a number of revolutions of the motor before the impact operation is detected in the impact detection processing; and
a second control including removing the limit on the increase in the number of revolutions of the motor when the impact operation is detected in the impact detection processing.