Rotor balancing F:7
Unbalance
A rotor is unbalanced when the centre of its
mass does not co-incide with the shaft centre.
This condition can be described as the rotor
having a ‘heavy spot’ somewhere along its
circumference.
If we know the position and weight of this
heavy spot, we can reduce it by taking away
mass or, more often, put a counterweight on
the oppisite side of the rotor.
For one plane balancing, it is assumed that the
heavy spot is on the centre line of a narrow
rotor or near enough, so that it does not matter
on which side of the centre line the counter
weight is place.
Position?
Counter
weight?
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