Motor Components
3.3 Gearboxes
1PH7/3-122
Siemens AG, 2004. All rights reserved
Induction Motors, 1PH7 (APH7S) – 05.04 Edition
3.3.1 Features
Gearbox features
Version as planetary gear
Gearbox efficiency: above 95 %
Gearboxes are available for motors, shaft heights 100 to 225
Selector gearboxes are available up to a drive output of 100 kW
Types of construction: IM B35 (IM V15) and IM B5 (IM V1) are possible
Note
1PH7 motors are only designed for stressing in accordance with the specifications
(refer to the cantilever force diagram and maximum torque).
For drive units where, for example, they are mounted to the gearbox flange or
gearbox enclosure, then for motors with type of construction IM B35, they must be
supported at the NDE without subjecting the motor frame to any stress.
P = constant
P
N
M = constant
M = constant
1
2
With gearbox
P = constant
n
max
P [kW]
n [RPM]
1
2
n
N
’ n
N
Without gear
box
Logarithmic scale
n
N
Rated speed
nN’ Rated speed with two-stage selector gearbox
n
max
Max. permissible speed
P
N
Rated power and also constant power of the three-phase motor
in the speed range from n
n
to n
max
or n
N
’ to n
max
M Torque
Fig. 3-3 Speed-power diagram when using a two-stage selector gearbox to extend the
constant power speed range of AC main spindle drive motors
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