Title:
電動工具
Document Type and Number:
Japanese Patent JP6460354
Kind Code:
B2
Abstract:
In order to provide an electric tool with good operability that can extend the life of and suppress breakage of a switching element for controlling energization of a brushless motor, a control unit (50), after an operation switch (5) is turned off, does not immediately turn off an inverter circuit (43) (does not set the duty of a PWM signal to 0), and instead normally operates the inverter circuit (43) with a low-duty PWM signal and waits until a rotation speed of a brushless motor (6) reaches a predetermined rotation speed or less to turn off the inverter circuit (43) (to set the duty of the PWM signal to 0).
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Inventors:
Hiroshi Mashiko
Kazutaka Iwata
Yuta Noguchi
Kazutaka Iwata
Yuta Noguchi
Application Number:
JP2016564763A
Publication Date:
January 30, 2019
Filing Date:
November 27, 2015
Export Citation:
Assignee:
Koki Holdings Co., Ltd.
International Classes:
B25F5/00; H02P6/24
Domestic Patent References:
| JP2013165677A | ||||
| JP11128587A | ||||
| JP2010209918A | ||||
| JP2012000726A | ||||
| JP3112386A | ||||
| JP2011136399A | ||||
| JP2223396A | ||||
| JP2005176454A |
Attorney, Agent or Firm:
Takashi Murai
Hiromi Murai
Hiromi Murai