Title:
METHOD FOR CONTROLLING ELECTRICALLY DRIVEN TOOL
Document Type and Number:
WIPO Patent Application WO/2017/122867
Kind Code:
A1
Abstract:
Provided is a method for controlling an electrically driven tool having an electric motor disposed therein and fastening nuts by controlling the current supplied to the electric motor, the electrically driven tool controlling method comprising: step 1 for determining, at the time of seating a nut, whether or not the rotation speed of the electric motor reaches a preset speed Vt; step 2-1 for, if the speed Vt is not reached, suspending the supply of current, fastening the nut solely by the rotational inertia force of the electric motor and, at the same time, detecting measured torques according to time, and thereby calculating a first torque rate; step 3-1 for consecutively providing an impact torque after the rotation speed of the electric motor becomes zero; and step 4 for compensating/controlling the next supplied pulse current if the maximum value of the measured torques with respect to the impact torques is greater than or equal to a value obtained by multiplying a target torque by a preset predetermined percentage.
Inventors:
OH SUNG SUB (KR)
LEE JONG JIN (KR)
KIM JUN YOUNG (KR)
LEE JONG JIN (KR)
KIM JUN YOUNG (KR)
Application Number:
PCT/KR2016/002066
Publication Date:
July 20, 2017
Filing Date:
March 02, 2016
Export Citation:
Assignee:
KEYANG ELECTRIC MACHINERY CO LTD (KR)
International Classes:
B25B21/00; B23P19/06; B25B23/147; B25F5/00; H02P29/00
Foreign References:
| KR20150071895A | 2015-06-29 | |||
| KR20150051886A | 2015-05-13 | |||
| JP5775484B2 | 2015-09-09 | |||
| KR101453891B1 | 2014-11-03 | |||
| JP2011156629A | 2011-08-18 |
Attorney, Agent or Firm:
B&IP-JOOWON PATENT AND LAW FIRM (KR)
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