Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2015/182509
Kind Code:
A1
Abstract:
In order to perform optimization with respect to required target performance and to provide an electric tool of a size that allows excellent operability, this electric tool is provided with a rotary impact mechanism unit (19) which converts the rotational force of a brushless motor (2) to an impact force and applies the impact force to a tip tool. The required rated input of the motor (2) is 1000-1300 (W), the constant speed control motor speed is 16800±10% (min-1), and the variable Ku, which relates to the motor (2), is defined by the following expression (1)
Ku = {(stator core outer diameter)2×(stator core lamination thickness)×(total tooth width)×(rotor outer diameter)}÷{(rated input)×(constant speed control motor speed)} … (1)
(here, the stator core outer diameter is a numerical value shown in mm, the stator core lamination thickness is a numerical value shown in mm, the total tooth width is a numerical value shown in mm, the rotor outer diameter is a numerical value shown in mm, the rated input is a numerical value shown in W, the motor speed is a numerical value shown in min-1),
and the Ku value of the motor (2) is set to 14.6 ≦ Ku ≦ 21.8.
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Inventors:
TANIMOTO HIDEYUKI (JP)
Application Number:
PCT/JP2015/064754
Publication Date:
December 03, 2015
Filing Date:
May 22, 2015
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
H02K29/00; B25D16/00; B25F5/00
Foreign References:
| JP2013111734A | 2013-06-10 | |||
| JP2007259513A | 2007-10-04 | |||
| JP2003224938A | 2003-08-08 | |||
| JP2010269409A | 2010-12-02 |
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