Dynamic balancing a rotor means to reduce its dynamic unbalance to zero or to an acceptable level.
This process will eliminate costly and sometimes irrepairable damage to the unit and is absolutely essential to the maintenance and quality of rotating parts.
The dynamic unbalance is by definition:
So it is necessary to operate on two different planes.
Since the dynamic unbalance equivalent ot the total unbalance Ut can be calculated with reference to two arbitrary planes, the consequence is that thte two balancing planes (where material can be added or removed) can be chosen.
The above is valid for rigid rotors where mass distribution (local unbalances) does not vary with the speed.
In order to balance with the minimum effort two rules are valid:
1) Choose balancing planes as far apart as possible
2) Choose a balancing radius as large as possible
Note: by the dynamic balancing on two different planes the total unbalance (set of local unbalances) is not reduced to zero; only the dynamic unbalance (on two planes ) equivalent to the total unbalance Ut is reduced to zero.
Discover more about dynamic balancing by visiting the Cemb Hofmann resource centre or call our expert balancing team on 0161 872 3123.