Instruction manual

App - 4
A
PPENDI
X
(2) Selection of the primary side (coil) (Logical value)
The linear servo motor has the output area (maximum thrust) that can be used only for a short time such as
acceleration/deceleration aside from the continuous thrust and that can provide about triple thrust of the
rated.
Calculate the continuous effective load thrust and the necessary maximum thrust from all data of the
machine and the operation pattern, and select a linear servo motor applicable to those results. The
following indicates the selection example for the operation pattern of line acceleration/deceleration.
V
M1
M2
Ff
Fmd
Fma
t
1
t
2
t
3
t
0
V
：
Feed speed [m/s]
M1 : Load mass [kg]
M2 : Weight on linear servo motor primary side
Fma : Acceleration time thrust [N]
Ff : Load power [N]
(Including friction, imbalance, cable bear)
Fmd : Deceleration time thrust [N]
t1 : Acceleration time [s]
t2 : Constant speed time [s]
t3 : Deceleration time [s]
t0 : 1 cycle time [s]
a : Acceleration and deceleration time
acceleration speed [m/s
2
]
: Efficiency of mechanical system
: Coefficient of friction
1) Temporary selection
Select temporarily the linear servo motor which mass ratios of the linear servo motor primary side
(coil) and the load become less than the recommended load mass ratio (refer to the specification list
of each linear servo motor).
Recommended load mass ratio
M1/M2
2) Calculation of load power
M = M1 + M2 [kg]
Ff =
(M 9.8 + Magnetic suction) [N] (Counting only friction)
3) Calculation of acceleration time and deceleration time thrust
Fma = M
a + Ff [N]
Fmd = -M
a + Ff [N]
4) Calculation of continuous effective load thrust
Frms
(Fma
2
t
1
+ Ff
2
t
2
+ Fmd
2
t
3
) / t
0
[N]