Mechanical properties of the motors
3.7 Balancing process
1PH7 induction motors (Machine tools)
82 Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
Table 3- 16 Requirements placed on the balancing process as a function of the motor balancing type
Balancing equipment/
Process step
Motor
Half key balanced
Motor balanced with full key Motor with plain
shaft end
Auxiliary shaft to balance
the mounted component
• Auxiliary shaft with
keyway
• Keyway with the same
dimensions as in the
motor shaft end
• Auxiliary shaft half key
balanced
• Auxiliary shaft with
keyway
• Slot design with the
exception of the slot
width (as the motor) can
be freely selected
• Auxiliary shaft full key
balanced
• Auxiliary shaft without
keyway
• If required, use a tapered
auxiliary shaft
• Balance quality of the auxiliary shaft ≤ 10 % of the required balance quality of the
component to be mounted to the motor
Attaching the mounted
component
to the auxiliary shaft for
balancing
• Attached using a key
• Key design, dimensions
and materials the same
as at the motor shaft end
• Attached using a key
• Key design, dimensions
and material the same as
used for the full key
balancing of the auxiliary
shaft
• Attach the component as
far as possible without
any play,
e.g. using a light press fit
on the tapered shaft
Position the mounted
component on the auxiliary
shaft
• Select a position between
the mounted component
and the key of the
auxiliary shaft so that it is
the same when mounted
on the actual motor
• No special requirements
Balance the mounted
component
• Two-plane balancing is recommended - i.e. balancing in two planes at both sides of the
mounted components at right angles to the axis of rotation
Special requirements
If special requirements are placed on the smooth running operation of the machine, we
recommend that the motor together with the output components is completely balanced.
In this case, balancing should be carried-out in two planes of the output component.
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