Selection criteria
SELECTING CRITERIA
Asynchronous motor selection
5.
· 185 ·
Ref.2003
QC-PDS
HARDWARE
When controlling a frictional load, for example horizontal movements such
as a conveyor belt or a movable table, the required power depends on the
friction coefficient µ. See figure F. H5/7.
The power required in this case P
F
, is calculated as follows.
Power needed to accelerate/decelerate an asynchronous
spindle motor.
There are three methods to control the acceleration and deceleration
process of the machine spindle:
Acceleration limited by time.
Different acceleration ramps based on the speed reached.
F. H5/7
Frictional load. Required power.
µ
Friction coefficiente
Mechanical efficiency
m
L
Table mass in kg
V
Linear speed in m / min
F. H5/8
Acceleration limited by time.
T. H5/5
Acceleration limited by time.
Method Acceleration limited by time
Control
Speed increases linearly in time until the command
speed is reached.
Comment The acceleration torque is constant
F. H5/9
Different accelerations depending on speed.
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