Power tool
AssigneeHitachi Koki Co., Ltd.
InventorsToshiaki Koizumi, Kazutaka Iwata
Life of this patent
Estimating the term…
Abstract
It is an object of the invention to provide a power tool capable of preventing damage of a switching element while maintaining drive power of a motor even when being connected to a power supply of different voltage. An impact driver 1 includes a motor 3; a rectifying circuit 23; an inverter circuit 20; and an arithmetic part 24. The rectifying circuit 23 is configured to rectify an input voltage from a commercial power supply 30. The inverter circuit 20 is configured to supply a rectified voltage output from the rectifying circuit 23 to the motor 3 as drive power. The arithmetic part 24 is configured to suppress occurrence of overcurrent where current flowing through the motor exceeds a predetermined current value.
Claims24
A power tool comprising:
- a motor;
- a rectifying circuit configured to rectify an input voltage from a commercial power supply;
- and
- a supply unit configured to supply a rectified voltage output from the rectifying circuit to the motor as drive power,
- wherein duty control for the motor is changed according to a voltage of the commercial power supply.
(canceled)
-13. (canceled)
A power tool comprising:
- a motor;
- a supply unit configured to supply drive power from a commercial power supply to the motor, the supply unit being configured to supply a voltage of the commercial power supply to the motor without smoothing the voltage;
- and
- a suppression unit configured to suppress occurrence of overcurrent where current flowing through the motor exceeds a predetermined current value.
(canceled)
(canceled)
-27. (canceled)
Dependencies are inferred from the claim text.