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US 2020/0260643 A1Published application
Electric working machine and method for controlling motor of electric working machine
AssigneeMakita Corporation
InventorsTatsuya HATA, Hiroshi NOJIRI, Yoshitaka ICHIKAWA
Life of this patent
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Abstract
One aspect of the present disclosure provides an electric working machine. The electric working machine includes a driver, a motor, and a control circuit. Attached to the driver is a selected tool. The motor drives the selected tool attached to the driver. The control circuit sets a target rotational frequency based on the selected tool. The control circuit controls the motor to rotate at the target rotational frequency.
Claims18
A grass cutter comprising:
- a driver configured such that a metal blade and a nylon cord cutter are selectively attached thereto;
- a motor configured to drive the metal blade or the nylon cord cutter attached to the driver;
- and
- a control circuit configured to control the motor to rotate at a target rotational frequency, the control circuit being configured to identify which one of the metal blade and the nylon cord cutter is attached to the driver based on a value of an electric current flowing through the motor, the control circuit being configured to set the target rotational frequency to a first maximum rotational frequency in response to the metal blade being attached to the driver, the control circuit being configured to set the target rotational frequency to a second maximum rotational frequency in response to the nylon cord cutter being attached to the driver, and the first maximum rotational frequency being higher than the second maximum rotational frequency.
1 more element
An electric working machine comprising:
- a driver configured such that a selected tool is attached thereto;
- a motor configured to drive the selected tool attached to the driver;
- and
- a control circuit configured to set a target rotational frequency based on the selected tool, the control circuit being configured to control the motor to rotate at the target rotational frequency.
1 more element
A method for controlling a motor of an electric working machine, the method comprising:
- identifying a tool attached to a driver of the electric working machine based on a magnitude of an electric current flowing through the motor, the tool being driven by the motor;
- setting a target rotational frequency of the motor based on a result of identification of the tool;
- and
- driving the motor to rotate at the target rotational frequency.
1 more element
Dependencies are inferred from the claim text.