Title:
METHOD FOR CONTROLLING ELECTRIC POWER TOOL
Document Type and Number:
WIPO Patent Application WO/2017/052017
Kind Code:
A1
Abstract:
Provided is a method of controlling an electric power tool which has an electric motor disposed therein and tightens a nut by controlling electric current supplied to the electric motor, the method comprising: a step of seating the nut; a step of determining whether a rotational speed of the electric motor reaches a predetermined speed Vt at the time of seating; a 1-1st control step of gradually decelerating the speed Vt by supplying a brake current to the electric motor when the speed Vt is reached in the determining step; and a second control step of, when the speed Vt is not reached, intermittently supplying a square wave current whose magnitude gradually increases, after stopping the supply of the current to reduce the rotational speed to zero.
Inventors:
OH SUNG SUB (KR)
LEE JONG JIN (KR)
LEE JONG JIN (KR)
Application Number:
PCT/KR2016/003604
Publication Date:
March 30, 2017
Filing Date:
April 06, 2016
Export Citation:
Assignee:
KEYANG ELECTRIC MACHINERY CO LTD (KR)
International Classes:
B25B21/00; B25B23/147; H02P29/00
Foreign References:
| JP2013166212A | 2013-08-29 | |||
| JP2013202705A | 2013-10-07 | |||
| JP2004291143A | 2004-10-21 | |||
| JPH07124827A | 1995-05-16 | |||
| JPH0679641A | 1994-03-22 |
Attorney, Agent or Firm:
B&IP-JOOWON PATENT AND LAW FIRM (KR)
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