Tension sensorless torque control details
TENSION SENSORLESS TORQUE CONTROL
131
5
Formula for calculating the torque for inertia compensation
Symbol
Description
Remarks
J
M
Motor inertia value
J (kg·m
2
)
J
L
Material inertia value
J (kg·m
2
)
—
J
B
Empty reel inertia value
J (kg·m
2
)
Z
Gear ratio
Pr.1243
/
Pr.1244
Pr.393
Line speed command acceleration/deceleration
reference
Pr.393
The parameter setting unit is as set in
Pr.358
.
t
Acceleration time for inertia compensation or
deceleration time for inertia compensation (s)
Pr.1414
,
Pr.1415
,
Pr.271
,
Pr.272
D
2
Minimum winding diameter (m)
Pr.1236
,
Pr.1238
,
Pr.1240
,
Pr.1242
The parameter setting unit is mm.
ρ
Material specific gravity (Kg/m
3
)
Pr.1413
The parameter setting unit is g/cm
3
.
L
Roll width (m)
Pr.1412
The parameter setting unit is mm.
D
1
Present winding diameter (m)
—
Ta
100 (%)
Rated motor torque T
M
Inertia compensation
torque T (%)
Roll width (L)
Minimum winding
diameter (D
2
)
Present winding diameter (D
1
)
Motor inertia (J
M
)
Material inertia (J
L
)
Reduction gear
(gear ratio: Z)
Empty reel inertia (JB)
Ta = [{J
M
+ (J
L
+ J
B
) × Z
2
} × {
Pr.393
/ (
π
× D
1
) / Z}] / (9.55 × t)
32
1
J
L
=
π
ρ
L (D
1
4
- D
2
4
)
=
Summary of Contents for A800 Plus Series
Page 240: ...239 MEMO ...
