Power tool - Hitachi Koki Co., Ltd.

Title:

Power tool

Document Type and Number:

Japanese Patent JP6044707

Kind Code:

B2

Abstract:

The purpose of the present invention is to use a motor with as high an output as possible to complete tightening operations at a high speed while limiting continuous drive output. In a power tool having a plurality of impact operation modes, the motor thereof is controlled at a 100% duty cycle so as to rotate at a high speed in the period between pulling of a trigger and starting of an impact operation (71a-71b), and the duty cycle is changed to a low duty cycle matching the appropriate operation mode after an impact by an impact mechanism is started and a predetermined stroke is performed so that the motor is driven at the low duty cycle until the trigger is returned (arrow 71c-71d). The switching of the duty cycle is performed when the current flowing to the motor exceeds a threshold (I 1 ).

Inventors:

Nobuhiro Takano
Kazutaka Iwata

Application Number:

JP2015509987A

Publication Date:

December 14, 2016

Filing Date:

March 18, 2014

Export Citation:

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