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3.10
Balancing
Requirements on the process of balancing mounted components - especially belt pulleys
In addition to the balance quality of the motor, the vibration quality of the motor with
mounted belt pulleys and coupling is essentially determined by the balance quality of the
mounted components.
If the motor and the mounted components are separately balanced before they are
assembled, the process for balancing the belt pulleys or coupling must be adapted to the
motor balancing type.
The 1PH3 motors support the following balancing types:
• Shaft with key: half-key balancing (an "H" is stamped on the shaft face)
• Plain shaft: without keyway
The balancing type is coded in the article number.
Note
Machining the feather key
In the case of a half-key balanced shaft end or a short output component, remove if
necessary the part of the feather key which protrudes out of the output component and
beyond the shaft contour. This is urgently recommended in the case of speeds above 1000
r/min and high requirements on the balance quality. To meet the highest requirements on
the system dynamic balance quality, you are recommended to use motors with a plain shaft
(without keyway).
See the table below for requirements on the balancing process as a function of the motor
balancing type:
Balancing equipment/process step
Auxiliary shaft to balance the mounted
components
Attaching the mounted components to
the auxiliary shaft for balancing
1PH3 main motors
Equipment Manual, 01/2021, A5E43087278-004
Motor with half-key balancing
•
Auxiliary shaft with keyway
•
Keyway with the dimensions same as at
the motor shaft end
•
Auxiliary shaft half-key balanced
•
Balance quality of the auxiliary shaft ≤ 10 % of the required balance quality of
the components to be mounted on the motor
•
Mounted components attached via a key
•
Design, dimensions, and materials of the
key same as at the motor shaft end
Mechanical properties
3.10 Balancing
Motor with a plain shaft
•
Auxiliary shaft without key-
way
•
If required, using a tapered
auxiliary shaft
•
Attaching the mounted com-
ponents as far as possible
without any clearance, for ex-
ample, using a light press fit
on the tapered auxiliary shaft
47
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