ABB
18
ABB/ BU Machines / HV Induction motors IEC catalogue / Standard motors EN 12-2007
1
Pulley diameter
When the desired bearing life has been determined, the
minimum permissible pulley diameter can be calculated
using F
R
, as follows:
D =
1.9 · 10
7
· K · P
n · F
R
The tables give the maximum permissible radial for-
ce in Newtons, assuming zero axial force, based on
normal conditions at 50 Hz and calculated bearing lives
L
10h
for 40,000 hours.
Motors are foot-mounted IM 1001 (B3) version with
force directed sideways. In some cases the strength of
the shaft affects the permissible forces.
Permissible loads of simultaneous radial and axial forces
can be supplied on request.
where:
D =
diameter of pulley, mm
P =
power requirement, kW
n
=
motor speed, r/min
K =
belt tension factor, dependent on belt type
and type of duty. A common value for
V-belts is 2.5.
F
R
=
permissible radial force
Permissible loadings on shaft
If the radial force is applied between points X
0
and X
max
,
the permissible force F
R
can be calculated from the
following formula:
F
R
= F
X0
-
(F
X0
- F
Xmax
)
E = length of shaft extension in basic version
X
E
M000145