■ Movement Principle of Electric Screwdriver Controller ( DO-1390A )
①Block chatr
②Electric current waveform
③Movement principle
Load current value of motor goes up as screw is fastened. Controller compares this value with the
preset one, and when the two values coincides, controller stops motors a determined time later.
④Reference
・ Load current is proportionate to fastening torque since DC motor is used.
・
Not to stop motor with starting current, the follwing condition is adopted.
t1 < t2
・ Current detection level for I １ is set to 75% of I 0.
Ｉ０：Motor starting current
Ｉ１：Detected current ( 0.75*10)
ｔ１：Current delay time in Ｉ１
( 50ms as follows)
ｔ２：Delay time（ｔ２＞ｔ１）
ｔ２＋ｔ３：Holding time（0.05～
Constant-voltage regulated
power supply circuit
( torque changeable)
Electric current Detector( Torque detection)
To Next Page
Loading...