Fagor QC-PDS - 5.5 Selecting the main power supply; 5.5.1 Calculation of the required power drawn from the power supply by the FAGOR FKM axis feed synchronous servomotors.

 Selection criteria
5.
SELECTING CRITERIA
Selecting the main power supply
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198
Ref.2003
QC-PDS
HARDWARE
5.5 Selecting the main power supply
5.5.1 Calculation of the required power drawn from the power supply by the
FAGOR FKM axis feed synchronous servomotors.
Initially, considering the mechanical power provided by the servomotors:
T. H5/13 Required power drawn from the main power supply by the QC-PDS system depending on the
mechanical power Pa provided by the motor.
FKM SYNCHRONOUS MOTORS
n : Maximum axis speed in the application (rpm)
nN : Motor rated speed (rpm)
Pa = Pcal·1.17· [n/nN] : Axis power (kW)
Mechanical power
Axes
Pcal
nnNPa
kW
rpm rpm
kW
GROUP I
From 0
to 2 kW
Synchronous
1
2
3
Sum of GROUP I
*
ki

GROUP II
From 2.0
to 8.5 kW
Synchronous
1
2
+
3
Sum of GROUP II
*
kii

GROUP III
From 8.5 kW
to 27 kW
Synchronous
1
2
+
3
Sum of GROUP III
*
kiii

=
POWER SUM (kW)
1
Nr of synchronous
motors per group
FACTOR
kj
1
1.00
2
0.63
3
0.50
4
0.38
5
0.33
6
0.28
where:
Pcal : motor power (kW) according to the motor
characteristics table.
1.17: coefficient combining the performance of the motor
(0.90) and that of the drive (0.95).
The servo set is divided in groups depending on their power
by applying to each one a simultaneity factor Ki, Kii, Kiii.
where:
j = i, ii, iii.