Motors, Generators & Electrification Equipment worked example
Motor Efficiency at 99% target nameplate efficiency: a worked example
Push target nameplate efficiency up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when you need a clean motor efficiency percentage and gap to target from a dynamometer or power-analyzer test.
The inputs for this scenario
- Motor shaft (output) power: 90 kW (unchanged)
- Motor electrical (input) power: 95 kW (unchanged)
- Target nameplate efficiency: 99 % (raised for this scenario; the documented default is 95)
Working through the calculation
- Applying the documented formula (Motor efficiency = motor output power ÷ motor input power × 100) to the inputs above produces each figure below.
- At this operating point the engine returns 94.74 % for motor efficiency, the number this scenario is built around.
- At this operating point the engine returns 4.26 points for efficiency gap to target.
- At this operating point the engine returns 90 count for motor output power.
- At this operating point the engine returns 95 count for motor input power.
How this compares with the baseline
- Against the tool's baseline example, where target nameplate efficiency sits at 95% and the headline result is 94.74 %, this scenario lands almost exactly on the baseline at 94.74 %.
- It computes a motor's efficiency from measured output and input power and reports the gap to your target efficiency in percentage points. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.
Results at a glance
- Motor efficiency: 94.74 % (headline result)
- Efficiency gap to target: 4.26 points
- Motor output power: 90 count
- Motor input power: 95 count
Run it with your numbers
- Every input above is editable in the live Motor Efficiency calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.