moog
MSD Servo Drive DC-AC Operation Manual
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Appendix
Project planning
63
Id.-No.: CA97554-001 Date: 06/2012
A.7 Dimensioning
This section summarizes how you can configure the MSD Servo Drive multi-axis system
appropriately for your application. The configuration of a multi-axis system depends
on a large number of parameters. The guidance provided in this section enables you to
compile all the relevant data for the dimensioning of your specific application.
NOTE:
Based on this data, the system engineering for the MSD Servo Drive
family will be able to provide you with detailed dimensional calculations for
your system requirements. You can reach the system engineering via
[email protected].
A.7.1 Calculating the required drive power per axis
Calculation of the drive power requires the following data for each rotary axis:
•
Maximum torque
•
Effective torque
•
Maximum speed
•
Gear ratio
− Effective torque formula
(with torque curves constant in each segment):
− Maximum torque formula:
√
∑M
i
²
.
t
i
T
M
eff
=
1
i
n
t
1
n
gear
M
max
load
M
accel
= 2 ·
M
accel
+
1
i
2
J
load
)
(J
motor
+
∆
∆
π
=
M
Calculation of the drive power for linear motors requires the following data for each
rotary axis:
•
Maximum thrust
•
Effective thrust
•
Maximum feed rate
A.7.2 Selection of suitable gearing and motors
The gearing is selected depending on the application either to attain the maximum
dynamism or for the most efficient possible continuous operation.
− Gear ratio formula (for optimum dynamism):
− Gear ratio formula (for effective utilization in continuous operation):
Motors are selected according to the following criteria:
•
M
max
•
n
max
•
M
nenn
> M
eff
Specify the encoder system according to the requirements of your application in terms of
absolute accuracy, repeatable accuracy, robustness and calculation of the machine zero:
•
Resolver
•
Sin/Cos encoder, single-turn
•
Sin/Cos encoder, multi-turn
A.7.3 Selection of suitable DC-AC servo drives
When the motors have been selected, the matching DC-AC servo drives are selected ac-
cording to the following criteria:
J
load
J
Motor
i =
√
n
N
n
load
i =
