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Title:
Power tool
Document Type and Number:
Japanese Patent JP6090576
Kind Code:
B2
Abstract:
An electric power tool comprising a brushless motor; a control unit configured to control power supply to the brushless motor; a rotary tool configured to be rotated by the brushless motor; a rotation speed detecting unit configured to detect a rotation speed of the brushless motor; a main switch configured to transmit, to the control unit, an ON/OFF signal for switching between driving and stopping of the brushless motor; and a mode switching unit configured to transmit, to the control unit, a mode switching signal for switching between multiple modes of rotation control of the brushless motor, wherein the control unit is configured to perform the rotation control of the brushless motor in any one of the multiple modes including at least a first mode and a second mode, wherein the control unit is configured to change the rotation control from first control to second control according to a load on the brushless motor, in the first mode, and wherein the control unit is configured not to change the rotation control from the first control to the second control according to the load on the brushless motor, in the second mode.

Inventors:
Kenichiro Yoshida
Akira Onose
Shinji Kuragano
Application Number:
JP2013169596A
Publication Date:
March 08, 2017
Filing Date:
August 19, 2013
Export Citation:
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Assignee:
Hitachi Koki Co., Ltd.
International Classes:
B25F5/00; B23D47/12
Domestic Patent References:
JP2012000726A
JP2008132545A
JP6014576A
JP2011240441A
JP2011016210A
Foreign References:
WO2012108415A1
Attorney, Agent or Firm:
Takashi Murai
Hiromi Murai



 
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