■ Electric screwdriver torque measurement.
①Definition of dynamic / static torque
※Static torque (Theoretical torque ) : means torque generated through motor's electrical energy ( Stall torque of motor )
※Dynamic torque ( Fastening torque ) : means torque generated at screw fastening.
(Stall torque of motor plus torque generated by inertial energy of motor rotor)
Type
How to measure
Torque waverorm
static
Torque
( TS)
Torque
inverter
Electric screwdriver
Input
Connector
Ampli-
fier
Electro-
magnetic
oscillo
scope
Record
Tp
(Max
torque
Ts
(Static
torque)
Type
How to measure
Torque waverorm
(
TD
)
T
o
rq
u
e
To
rq
u
e
Ch
ec
ke
r
A
ctu
al s
cre
w
fa
ste
n
in
g
Electric
screwdrive
Torque
Input
Input
Peak indicator
Electric
screw
driver
Electro-
magnetic
oscillo
scope
Record
※
Tapping screw
※
Machine screw
plastic
lron board
D
yna
m
ic
t
o
rqu
e
D
yn
ami
c
to
rq
u
e
D
yn
ami
c
to
rq
u
e
－14－
