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Derating due
to harmonics
3.3
Permissible axial and radial forces
The maximum permissible axial and radial forces must not be exceeded in order to ensure smooth running of the
motor.
3.3.1
Table
Indicated in the table:
- the highest permissible lateral force F
- the highest permissible axial force FAm for a lifetime of 20.000 hours.
Lateral force F
at speed n [rpm]
Motor
2000 3000 4000 6000 2000 3000 4000 6000
A1
A2
310
A3
A4
B1
B2
400
B3
C1
C2
470
C3
C4
460
D1
D2
720
D3
D4
E1
E2
1100 1000 850
E3
E4
F1
F2
2300 1900 1800
F3
F
permissible lateral force
Rm
F
max. permissible dynamic lateral force
Rmax
F
permissible axial force
Am
d
Shaft diameter
1
A derating can be necessary due to different clock frequencies of the power stages
of the inverters and the associated different losses by the current harmonics.
at x=L/2
Rm
[N]
Axial force F
Rm
at speed n [rpm]
260
240
210
250
340
300
270
310
400
350
320
380
370
330
260
350
640
550
490
590
-
900
-
1800 1500 1400
Operating Conditions
[N]
Am
d
L
9 k6
200
170
140
20
11 j6
260
220
180
23
310
260
220
14 k6
30
280
240
200
19 k6
500
420
350
40
24 k6
770
650
560
50
32 k6
-
58
L
Length of the shaft end
F
Inertial force of the rotor
G
P
Linear size P
C
Linear size C
F
P
1
G
[N]
[mm]
1
2
10
3
4
2
4
11
6
3
9
17
14
20
10
17
24
23
30
17
30
24
40
60
85
140
31
200
C
F
Rmax
[mm]
[N]
96
108
600
121
145
81
105
800
141
131
155
1000
189
223
138
168
2000
198
228
188
218
2300
248
293
280
360
6000
440
GB - 17
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