SEW-Eurodrive DR63 Series, Дополнение к инструкции по эксплуатации, Страница: 51 / 64

Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
51
9
Maximum permitted overhung loads
Technical Data
9 Technical Data
9.1 Maximum permitted overhung loads
The following table lists the permitted overhung loads (top value) and axial forces (bot-
tom value) of explosion-proof AC motors:
9.1.1 Overhung load conversion for off-center force application
The permitted overhung loads must be calculated using the following formulae in the
event that force is not applied at the center of the shaft end. The smaller of the two val-
ues F
xL
(according to bearing life) and F
xW
(according to shaft strength) is the permitted
value for the overhung load at point x. Note that the calculations apply to M
a max
.
FxL based on
bearing service life
FxW based on
shaft strength
Mounting position
[rpm]
Number
of poles
Permitted overhung load F
R
[N]
Permitted axial force F
A
[N]; F
A_tensile force
= F
A_pressure
Size
63
250
280
Foot-mounted
motor
1500
4 -
- 8000
2500
Flange-mounted
motor
1000
6 600
150 -
-
1500
4 500
110
9000
2600
F F
a
b x
N
xL R
= ×
+
[ ]
F
R
= Permitted overhung load (x = l/2) [N]
x = Distance from the shaft shoulder to the force application point [mm]
a, b, f = Motor constants for overhung load conversion [mm]
c = Motor constant for overhung load conversion [Nmm]
Figure 1: Overhung load F
X
for off-center force application
F
c
f x
N
xW
=
+
[ ]
l
l/2
x
F
R
F
x
F
A
d
l
l/2
x
F
Ra
F
x
F
A
d
R
P
i
f
kVA
Hz
n