Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2013/137480
Kind Code:
A3
Abstract:
An electric tool for driving a tip tool, the electric tool includes: a removable battery; the brushless motor configured to generate a driving force for driving the tip tool; an inverter circuit configured to supply drive power from the removable battery to the brushless motor using a plurality of semiconductor switching elements; a controller configured to control the inverter circuit to control rotation of the brushless motor; a temperature detector configured to detect a temperature of the brushless motor or the semiconductor switching elements; and a voltage detector configured to detect a voltage of the battery. The brushless motor is driven such that a duty ratio of PWM drive signal for driving the semiconductor switching elements is determined based on relationship between the temperature detected by the temperature detector and the voltage detected by the voltage detector.
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Inventors:
TAKANO NOBUHIRO (JP)
HARADA TETSUHIRO (JP)
IIMURA YOSHIO (JP)
NISHIKAWA TOMOMASA (JP)
UCHIDA HIROKI (JP)
NAKANO YOSHIHIRO (JP)
HARADA TETSUHIRO (JP)
IIMURA YOSHIO (JP)
NISHIKAWA TOMOMASA (JP)
UCHIDA HIROKI (JP)
NAKANO YOSHIHIRO (JP)
Application Number:
PCT/JP2013/058176
Publication Date:
April 10, 2014
Filing Date:
March 13, 2013
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
H02P3/00; B25F5/00; H02P7/00; H02P27/08
Domestic Patent References:
| WO2004068693A2 | 2004-08-12 | |||
| WO2009102082A2 | 2009-08-20 | |||
| WO2010035547A1 | 2010-04-01 | |||
| WO2012042324A1 | 2012-04-05 |
Foreign References:
| JP2010069598A | 2010-04-02 | |||
| US20040124808A1 | 2004-07-01 | |||
| US20120074877A1 | 2012-03-29 | |||
| EP2433756A2 | 2012-03-28 | |||
| EP2445111A2 | 2012-04-25 |
Attorney, Agent or Firm:
SHIN-EI PATENT FIRM, P.C. (7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, JP)
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