Fagor QC-PDS, Hardware Manual

Page: 185 / 420

  
Selection criteria
S
E
LECT
ING CRI
T
ERIA
Asynchr
o
nous 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.
C a r g a
M o t o r
V e l o c i d a d
speed
load
motor
P
F

·m
L
·V
6120·

=
(kW)
adjust
time
0
Ta
speed
adjust
time
0
Ta
speed