the ultimate goal of rotor balancing is to reduce distance between center of gravity and center of rotation to acceptable tolerance

generally, there are 2 types of balancing, i.e.
1) static
2) dynamic

based on location, there are 2 types of balancing
1) shop balancing (low speed in atmosphere, high speed in vacuum)
2) field / insitu balancing (actual speed)

based on phase, it can be classified as below:
1) non-phasor balancing
              a) 2 point @ 3 run balancing
              b) 3 point @ 4 run balancing
2) phasor balancing
              a) graphical method
              b) computer method

based on correction weight, there are 2 types of balancing
1) weight-add-on balancing
2) weight-removal balancing

based on trial weight, there are 2 types of balancing
1) permanently removed trial weight balancing
2) permanently attached trial weight balancing

based on width, there are single and multiplanes balancing

there is another type called "one shot balancing", it can be done only with prior data

if you're interested in learning rotor balancing, these are the clues for you to begin with:
1) please find out why ISO 1940 is very important for shop balancing?
2) please find out where to put trial weight and why?
3) please find out what are High Spot, Heavy Spot, Low Spot and Light Spot?

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