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Product Description
2.5
Project design
2.5.1
Selection of the servo motor
Calculate the following values before you select the servo motor:
•
Determine inertia (J
•
Calculate required peak torque (ML
accepted here with 1/5 inertia (JApp) of the application.
•
Determine the effective torque (M
Now the motor can be selected on the basis of the calculated values and the technical data of the following pages.
The following selection features must be observed:
Maximum speed of the application (n
For examination or optimization it can be calculated again with the real motor data.
2.5.2
Selection the servo controller
The selection of the servo controller occurs via the max. short time current limit and the output rated current. Alter-
natively KEB provides the „motor configurator" for registered users in Internet and Service&Downloads.
Max. short time current =
2.5.3
Output component
The smallest possible effective circular diameter of the output component can be calculated as follows:
k • 2 • Mb
---------------
D
=
W
2.5.4
Pretension factor
Empirical values for the pretension factor k:
For dynamic processes like braking and accelerating, the permissible lateral force FR is not to be exceeded in
order to avoid a mechanical destruction of the motor.
GB - 10
) of the application without motor
App
eff
Calculated data of the application
required peak torque (M
Effective torque (M
Inertia of the application (J
Output rated current =
D
effective circular diameter of the output components
W
K
pretension factor
F
permissible lateral force
Rm
F
Rm
M
acceleration torque of the drive
b
) of the application at the drive. The inertia of the motor (JMot) can be
max
) via the time.
Motor data
) ≤ Rated motor speed (n
max
) ≤ Maximum torque (M
Lmax
) ≤ Rated torque (M
eff
) / 10 ≤ Motor torque (J
App
MLmax • Stall current (I
------------------------------------------------
Stall torque (Md0)
Effective torque (M
eff
----------------------------------------------------------------------------
Stall torque (Md0)
Pinion
1.5
Toothed belt
1.2...2.0
k ≈
V-belt
1.5...2.5
Flat belt
2.2...3.0
)
N
)
max
)
dN
)
mot
)
d0
) • Stall current (I
)
d0
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