Selection criteria
SELECTING CRITERIA
Asynchronous spindle motor and servo drive selection
5.
213
DDS
HARDWARE
Ref.1310
In the case of a drill, the bit is mounted on the spindle itself and turns with
this to drill the material. See figure
F. H5/5.
The power required in this case Pd may be calculated with the following
formula:
In the event of governing a
gravitational load, the power required de-
pends very much on the presence on absence of balance weights (crane
or elevator).
See figure F. H5/6.
The power required in this case, P
GL
and P
GLC
may be calculated as fol-
lows:
Governing a
frictional load, this is the case of horizontal movements
such as a conveyor belt or a movable table, the required power depends
on the friction coefficient µ
. See figure F. H 5/ 7 .
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
P
d
M· 2
·n
60·100·1000·
d
=
·D²
·f
4·1000·S
d
·
d
(kW)
=
Drum
Load
Balance
weight
Motor
Speed
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