Motor Components
3.3 Gearboxes
1PH7/3-123
Siemens AG, 2004. All rights reserved
Induction Motors, 1PH7 (APH7S) – 05.04 Edition
Examples
AC motor without selector gearbox
For P = constant from n
N
= 1500 RPM to n
max
= 6300 RPM a constant power con-
trol range greater than 1:4 is possible.
AC motor with selector gearbox
For gearbox stage i
1
= 4 and i
2
= 1 a constant power control range of greater than
1:16 is possible (n
N
’ = 375 RPM to n
max
= 6300 RPM).
Gearbox mounted outside the spindle box
The following advantages are obtained by locating the gearbox outside the spindle
box:
Gearbox vibration is not transferred.
Separate lubricating systems for the main spindle (grease) and selector gear-
box (oil).
No noise and no temperature fluctuations caused by the gearbox pinion wheels
in the spindle box.
Instead of using belts, the drive power can also be transferred from the gearbox
out-drive using pinion (on request) or co-axially through an equalizing coupling.
Vibration severity level
Motor + gearbox: Tolerance R (acc. to DIN ISO 2373)
This is also valid if motor tolerance level S is ordered.
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