Title:
ELECTRIC POWER TOOL
Document Type and Number:
WIPO Patent Application WO/2016/098563
Kind Code:
A1
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).
Inventors:
MASHIKO HIRONORI (JP)
IWATA KAZUTAKA (JP)
NOGUCHI YUTA (JP)
IWATA KAZUTAKA (JP)
NOGUCHI YUTA (JP)
Application Number:
PCT/JP2015/083426
Publication Date:
June 23, 2016
Filing Date:
November 27, 2015
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
B25F5/00
Foreign References:
| JP2012000726A | 2012-01-05 | |||
| JPH03112386A | 1991-05-13 | |||
| JP2011136399A | 2011-07-14 | |||
| JPH02223396A | 1990-09-05 | |||
| JP2005176454A | 2005-06-30 |
Other References:
See also references of EP 3235600A4
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