Allowed wheel load
The allowed wheel load is based on the fatigue strength of the shaft (curved part)
and the load carrying capacity of the screw joints (flat part). The maximum allowed
wheel load depends on the load point. With applications combining high radial and
axial loads, please consult the motor manufacturer or its representative to determine
maximum permissible loading.
a (mm)
r (m)
F
a
(kN)
F
r
(kN)
BB series motors:
BB 4:
BB 5:
BB 6:
BB 7:
F
max
≥
α
x F
r
+ 5,3 x r x F
a
F
max
≥
α
x F
r
+ 4,6 x r x F
a
F
max
≥
α
x F
r
+ 4,0 x r x F
a
F
max
≥
α
x F
r
+ 3,4 x r x F
a
BBC series motors:
BBC 2:
BBC 3:
BBC 5:
F
max
≥
α
x F
r
+ 5,62 x r x F
a
F
max
≥
α
x F
r
+ 5,41 x r x F
a
F
max
≥
α
x F
r
+ 4,45 x r x F
a
Dynamic factor (
α
):
• constant loading at low speed,
α
= 1
• variable loading,
α
= 1 - 1,5
• shock loads or high speed (for > 70 km/h
or 45 mph),
α
= 1,4 - 2
BB series motors
MOTOR LOAD CURVE: BB 4
F
max
[kN]
Figure 48. Motor load carrying capacity Fmax.
Wheel off-
set, a [mm]
MOTOR LOAD CURVE: BB 5, BB 6 AND BB 7
F
max
[kN]
Figure 49. Motor load carrying capacity Fmax.
Wheel off-
set, a [mm]
5.1.2
Motor Sizing
Product Manual
47
