Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2018/180085
Kind Code:
A1
Abstract:
Provided is an electric tool capable of sufficiently cooling a switching element. The electric tool has: a housing 2; a motor 3 which is housed inside the housing 2, and has a stator 33, a rotor 32 capable of rotating relative to the stator, and a rotating shaft capable of integrally rotating with the rotor; a fan 34 for generating a cooling wind inside the housing 2; a magnetic sensor unit 41 capable of detecting the position of rotation of the rotor 32; a switching unit 42 for controlling the rotation of the rotor 32; and a ring-shaped substrate 40 on which the magnetic sensor unit 41 and the switching unit 42 are mounted. The stator 33, the fan 34, the magnetic sensor unit 41, the switching element 42 and the ring-shaped substrate 40 are provided inside the housing 2 in the following order in the axial direction of the rotor 32: fan 34, magnetic sensor unit 41, ring-shaped substrate 40, switching unit 42, and stator 33.
Inventors:
MATSUSHITA AKIRA (JP)
NISHIKAWA TOMOMASA (JP)
NOGUCHI YUTA (JP)
HIRAI TAKAHIRO (JP)
NISHIKAWA TOMOMASA (JP)
NOGUCHI YUTA (JP)
HIRAI TAKAHIRO (JP)
Application Number:
PCT/JP2018/006763
Publication Date:
October 04, 2018
Filing Date:
February 23, 2018
Export Citation:
Assignee:
KOKI HOLDINGS CO LTD (JP)
International Classes:
B25F5/00
Domestic Patent References:
| WO2016067810A1 | 2016-05-06 |
Foreign References:
| JP2014200884A | 2014-10-27 | |||
| JP2009285789A | 2009-12-10 | |||
| JP2002112504A | 2002-04-12 | |||
| US20130313925A1 | 2013-11-28 |
Other References:
See also references of EP 3603896A4
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