2 - Fagor Automation

SELECTING CRITERIA
5
5.1 Selection of the synchronous motor and its associated drive
First motor pre-selection
F. H5/1
General diagram of a MOTOR - LEADSCREW - TABLE system.
The motor selection will depend on the mechanical and dynamic response
characteristics that it must satisfy. Hence, the motor must meet
the specifications on torque (Nm), speed, duty cycles or other kind of requirements
of the motor to be moved.
Calculation of the necessary motor torque (M)
The required total motor torque MT has two components:
• The static torque MS to maintain the table at a constant speed or fixed
in a position.
• The acceleration torque MA to change its speed.
The reduction in the motor ballscrew transmission [i] is a factor to be considered
in many of the following calculations:
M
T
= M
S
+ M
A
MTOTAL = MCONTINUOUS + MACCELERATION DP1
i =
-----------
DP2
DDS
HARDWARE
Ref.1209
205