Fagor QC-PDS, Hardware Manual

Page: 184 / 420

  
Selection criteria
5.
S
E
LECT
ING CRI
T
ERIA
Asynchr
o
nous motor
selection
· 184 ·
198
Ref.2003
QC-PDS
HARDWARE
Te power required in this case Pd is calculated as below:
When controlling a gravitational load, the required power depends for the
most part on the presence on absence of counterweights (crane or
elevator).
See figure
F. H5/6
.
The power required in this case, P
GL
y P
GLC
is calculated in the following
way:
F. H5/5
Drilling. Required power.
M
Drilling load torque in N·cm
n
Spindle turning speed in rpm
D
Hole diameter in mm
f
Feedrate in mm/min

d
Mechanical efficiency (varies from 0.7 to 0.85)
S
d
Cutting efficiency. Cutting volume per kilowatt every minute
(cm³/kW)/min
F. H5/6
Gravitational load. Required power.
V
Linear speed in m/min

Mechanical efficiency
m
L
Table mass in kg
m
C
Counterweight mass in kg
f
D
D
f
P
d
M· 2

·n
60·100·1000·

d
=

·D²·f
4·1000·S
d
·

d
(kW)
=
D r u m
L o a d
M o t o r
S p e e d
P
GLC
(m
L
-m
c
)·V
6120·

= (kW)
P
GL
m
L
·V
6120·

= (kW)
D r u m
L o a d
B a l a n c e
w e i g h t
M o t o r
S p e e d