205
5
DDS
HARDWARE
Ref.1310
SELECTING CRITERIA
5.1 Selection of the synchronous motor and its associated drive
First motor pre-selection
The motor selection will depend on the mechanical and dynamic re-
sponse characteristics that it must satisfy. Hence, the motor must meet
the specifications on torque (Nm), speed, duty cycles or other kind of re-
quirements of the motor to be moved.
Calculation of the necessary motor torque (M)
The required total motor torque M
T
has two components:
• The static torque M
S
to maintain the table at a constant speed or fixed
in a position.
• The acceleration torque M
A
to change its speed.
The reduction in the motor ballscrew transmission [
i] is a factor to be con-
sidered in many of the following calculations:
F. H5/1
General diagram of a MOTOR - LEADSCREW - TABLE system.
M
T
M
S
M
A
+=
M
TOTAL
M
CONTINUOUS
M
ACCELERATION
+=
i
DP1
DP2
------------=
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