Title:
IMPACT TOOL
Document Type and Number:
WIPO Patent Application WO/2021/002120
Kind Code:
A1
Abstract:
The purpose of the present disclosure is to provide an impact tool that allows an improvement in workability. An impact tool (1) comprises an electric motor (15), an impact mechanism, a strike detection unit (49), and a control unit (4). The electric motor (15) has a permanent magnet (131) and a coil (141). The impact mechanism obtains power from the electric motor (15) and performs a striking operation to generate a striking force. The strike detection unit (49) detects the presence or absence of a striking operation. The control unit (4) controls the operation of the electric motor (15). The control of the control unit (4) includes magnetic flux-weakening control which causes a magnetic flux-weakening current to flow through the coil (141). The magnetic flux-weakening current generates, in the coil (141), a magnetic flux for weakening the magnetic flux of the permanent magnet (131). In the magnetic flux-weakening control, the control unit (4) reduces the magnetic flux-weakening current after the strike detection unit (49) detects a striking operation.
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Inventors:
NAKAHARA MASAYUKI
KUSAGAWA TAKASHI
UEDA TAKAHIRO
KUSAGAWA TAKASHI
UEDA TAKAHIRO
Application Number:
PCT/JP2020/020604
Publication Date:
January 07, 2021
Filing Date:
May 25, 2020
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
B25B21/02
Domestic Patent References:
| WO2018230141A1 | 2018-12-20 | |||
| WO2018159274A1 | 2018-09-07 | |||
| WO2016207936A1 | 2016-12-29 |
Foreign References:
| JPH10328952A | 1998-12-15 | |||
| JP2016078230A | 2016-05-16 | |||
| JP2014213422A | 2014-11-17 | |||
| JP2018196172A | 2018-12-06 |
Attorney, Agent or Firm:
HOKUTO PATENT ATTORNEYS OFFICE (JP)
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