公开(公告)号：US12053864B2

公开(公告)日：2024-08-06

申请号：US17778308

申请日：2020-09-18

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Itaru Murui ,  Shota Fujii ,  Keita Okamoto ,  Naoki Tsujimoto ,  Kota Kitamura ,  Kotaro Momoeda

IPC: B25B23/147 ,  B25B21/02 ,  H02P23/00

CPC classification number: B25B23/1475 ,  B25B21/02 ,  H02P23/0004

Abstract: An electric tool system includes a motor, a control unit, and an output shaft. The motor includes a stator and a rotor. The control unit performs vector control on the motor. The control unit includes a first acquisition unit, a second acquisition unit, and a command value generation unit. The command value generation unit calculates, based on a torque current acquisition value (current measured value) as a value related to a torque current as acquired by the first acquisition unit and an acceleration acquisition value as a value related to acceleration of the rotor as acquired by the second acquisition unit, at least one of a command value of the torque current to be supplied to the motor or a command value of an excitation current to be supplied to the motor.

公开(公告)号：US12186865B2

公开(公告)日：2025-01-07

申请号：US17919098

申请日：2021-02-10

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Itaru Murui ,  Shota Fujii ,  Kotaro Momoeda

IPC: B25B23/147 ,  B25F5/00

Abstract: An electric tool system includes: a motor; an output shaft to be coupled to a tip tool; a transmission mechanism that transmits motive power of the motor to the output shaft; an acquirer that acquires, based on a current flowing through the motor, a torque value related to output torque provided by the tip tool; and a controller that has a torque management mode in which the controller controls the motor in accordance with an operating command entered by a user through a trigger switch and prevents the torque value from exceeding an upper limit value. The controller controls, when finding a predetermined condition satisfied in the torque management mode, a velocity of the motor into a predetermined restriction value irrespective of a manipulative variable of the trigger switch. The predetermined condition includes a condition that the torque value reach a threshold value smaller than the upper limit value.