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Field Balancing of a Rotor
- Method of balancing a rotor is based on an extension of balancing of a thin disc during rotation
- Following the text book "Principles of Vibration Control", one can show that for balancing of thin disc one needs to measure
- amplitude (
 ) and phase ( ) of vibration
- the effect of adding additional mass (
 ) to the disc for the amplitude ( ) and phase ( ).
- Accordingly, denoting
 one can find the balancing mass ( ) and it's location  in polar coordinates as
where,  is the radial distance of the trial mass and is the angular location.
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