77
AX Series
Selection guide (2)
For "MC2 curve " selection guide
MC2 curve
Selection method
4 (t
1
)
0.5 (ta) 0.5 (ta)
(t
0
)
Constant velocity
section (75%)
MC2
With the MC2 curve, the model is selected using the following formula:
Movement angle : (˚)
Cycle time : t
0
(s)
Moving time : t
1
(s)
Acceleration or deceleration time : ta (s)
Max. rotation speed : Nmax (rpm)
Load moment of inertia : J (kg·m
2
)
Output shaft moment of inertia : J
M
(kg·m
2
)
Friction torque : Tf (N·m)
Working torque : T
W
(N·m)
Output shaft friction torque : T
MF
(N·m)
Nmax =
6 (t
1
-0.863ta)
Tm =
Trms =
5.53 (J + J
M
) ·
· fc + T
MF
+ Tf + T
W
720 · ta
2
··
1-
t
1
-0.863ta
t
1
-2ta
Load torque (max.): T
m
(N·m)
Load torque (effective): Trms (N·m)
3.91 (J + J
M
) · + [ (Tf + Tw) · fc + T
MF
]
2
· fc
720 · ta
2
1-
t
1
-0.863ta
t
0
2ta
t
1
-2ta
2
The MC2 curve has a constant velocity in movement the same as
the MC (modified constant velocity) curve, but by setting an
acceleration/deceleration time, the constant velocity is set freely.
With the MC (general name: MCV50) curve, the constant velocity
section is 50%.
In the example, acceleration/deceleration time (ta) is set to 0.5 sec.
for movement time (t
1
): 4 sec., a speed pattern that sets the
constant velocity to 75% is created.
Note: Acceleration/deceleration time is set to one-half or less of
movement time. If acceleration/deceleration time setting
exceeds one-half of movement time, the cam curve is
automatically changed to an MS (modified sine wave) curve.
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