Engineering Guide CDA3000
2-27
2 Drive definition
DE
EN
1
2
3
4
5
6
7
A
Power factor
P/PN
Loading on the shaft
Figure 2.17
Power factor cos
ϕ
of a four-pole standard three-phase AC
motor
Limit speed
n
max
Limit speed
H
Axle height
1
Greased groove ball bearings in two-pole motors
2
Greased groove ball bearings in four-pole motors and higher
3
Strength of the short-circuiting rings of the rotor cage
4
Bend-critical speed
Figure 2.18
Typical limit speed of a standard three-phase AC motor
1.00
0.75
0.50
0.25
0
0
0.25
0.50
0.75
1,00
1.25
1500 rpm
n
max
rpm