Power Electronics, Motors & Drives worked example

Rotor Balancing Cost at 58% share of rotors requiring balancing: a worked example

Suppose share of rotors requiring balancing falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate rotor balancing cost from rotor quantity, balancing cost per rotor, the share of rotors requiring the work, and fixed setup cost.

The inputs for this scenario

  • Rotors in scope: 100 rotors (held at the documented default)
  • Balancing cost per rotor: 45 $ / rotor (held at the documented default)
  • Share of rotors requiring balancing: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed balancing setup cost: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable rotor balancing cost = rotors in scope × balancing cost per rotor × rotors requiring balancing.
  • Total rotor balancing cost works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Rotor balancing cost per rotor works out to 28.6 $ / piece at these inputs.
  • Variable rotor balancing cost works out to 2,610 $ at these inputs.
  • Fixed balancing setup cost works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where share of rotors requiring balancing sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • It computes total rotor balancing cost from variable per-rotor cost weighted by the share needing balancing plus a fixed setup, and derives a blended per-rotor figure. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total rotor balancing cost: 2,860 $ (headline result)
  • Rotor balancing cost per rotor: 28.6 $ / piece
  • Variable rotor balancing cost: 2,610 $
  • Fixed balancing setup cost: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Rotor Balancing Cost calculator, set share of rotors requiring balancing to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.