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US 12,576,469 B2Granted
Technique for controlling motor in handheld electric work machine
AssigneeMakita Corporation
InventorHitoshi Suzuki
Life of this patent
Estimating the term…
Abstract
One aspect of the present disclosure provides an electric work machine including a motor, a motor driver, an output shaft, a housing, two or more measurement devices, and a control circuit. The housing includes a handle fixed thereto or is configured such that the handle is detachably attached thereto. The two or more measurement devices (i) receive two or more loads from the handle fixed or attached to the housing, and also (ii) measure the two or more loads received. The control circuit adjusts a magnitude of the electric power, based on the two or more loads measured.
Claims22
A handheld electric work machine, comprising:
- a motor configured to generate a rotational force;
- a motor driver configured to supply an electric power to the motor, thereby to drive the motor;
- an output shaft configured to transmit the rotational force of the motor to a tool, thereby to drive the tool;
- a housing (i) including a handle fixed thereto or (ii) being configured such that the handle is detachably attached thereto, and the handle being configured to be gripped by a user of the handheld electric work machine;
- two or more measurement devices configured to:
- receive two or more loads from the handle fixed or attached to the housing;
- and
- measure the two or more loads received;
- and
- a control circuit configured to adjust a magnitude of the electric power, based on the two or more loads measured,
- wherein the control circuit is configured to:
- adjust the magnitude of the electric power to a first magnitude;
- and
- adjust the magnitude of the electric power to a second magnitude based on the two or more loads measured satisfying a preset requirement, and
- wherein the second magnitude is smaller than the first magnitude.
12 more elements
A handheld electric work machine, comprising:
- a motor configured to generate a rotational force;
- a motor driver configured to supply an electric power to the motor, thereby to drive the motor;
- an output shaft configured to transmit the rotational force of the motor to a tool, thereby to drive the tool;
- a housing (i) including a handle fixed thereto or (ii) being configured such that the handle is detachably attached thereto, and the handle being configured to be gripped by a user of the handheld electric work machine;
- two or more measurement devices configured to:
- receive two or more loads from the handle fixed or attached to the housing;
- and
- measure the two or more loads received;
- and
- a control circuit configured to adjust a magnitude of the electric power, based on the two or more loads measured,
- wherein the handle includes:
- a shaft (i) fixed into the housing or (ii) configured to be detachably inserted into the housing;
- a holding portion configured (i) to be gripped by the user, and (ii) to accommodate a portion of the shaft;
- and
- a second elastic body between the shaft and the holding portion, and
- wherein the housing includes a first hole (i) having the shaft inserted therein or (ii) configured to detachably receive the shaft.
13 more elements
A handheld electric work machine, comprising:
- a motor configured to generate a rotational force;
- a motor driver configured to supply an electric power to the motor, thereby to drive the motor;
- an output shaft configured to transmit the rotational force of the motor to a tool, thereby to drive the tool;
- a housing (i) including a handle fixed thereto or (ii) being configured such that the handle is detachably attached thereto, and the handle being configured to be gripped by a user of the handheld electric work machine;
- two or more measurement devices configured to:
- receive two or more loads from the handle fixed or attached to the housing;
- and
- measure the two or more loads received;
- and
- a control circuit configured to adjust a magnitude of the electric power, based on the two or more loads measured,
- wherein the control circuit is configured to:
- adjust the magnitude of the electric power to a first magnitude;
- and
- adjust the magnitude of the electric power to a second magnitude based on none of the two or more loads measured reaching a first threshold, and
- wherein the second magnitude is smaller than the first magnitude.
12 more elements
A handheld electric work machine, further comprising:
- a motor configured to generate a rotational force;
- a motor driver configured to supply an electric power to the motor, thereby to drive the motor;
- an output shaft configured to transmit the rotational force of the motor to a tool, thereby to drive the tool;
- a housing (i) including a handle fixed thereto or (ii) being configured such that the handle is detachably attached thereto, and the handle being configured to be gripped by a user of the handheld electric work machine;
- two or more measurement devices configured to:
- receive two or more loads from the handle fixed or attached to the housing;
- and
- measure the two or more loads received;
- a control circuit configured to adjust a magnitude of the electric power, based on the two or more loads measured;
- a first electric system configured to conduct an AC power, and
- a second electric system electrically isolated from the first electric system.
8 more elements
A handheld electric work machine, comprising:
- a motor configured to generate a rotational force;
- a motor driver configured to supply an electric power to the motor, thereby to drive the motor;
- an output shaft configured to transmit the rotational force of the motor to a tool, thereby to drive the tool;
- a housing (i) including a handle fixed thereto or (ii) being configured such that the handle is detachably attached thereto, and the handle being configured to be gripped by a user of the handheld electric work machine;
- two or more measurement devices configured to:
- receive two or more loads from the handle fixed or attached to the housing;
- and
- measure the two or more loads received;
- and
- a control circuit configured to adjust a magnitude of the electric power, based on the two or more loads measured,
- wherein the two or more measurement devices includes first through third measurement devices.
8 more elements
Dependencies are inferred from the claim text.