Power Electronics, Motors & Drives worked example

Motor Efficiency Test Workload at 99% target efficiency test coverage: a worked example

What does the result look like when target efficiency test coverage reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when planning dynamometer, torque-speed, efficiency map, heat run, or compliance test workload for motor production.

The inputs for this scenario

  • Motors scheduled for efficiency test: 8 motors (unchanged)
  • Total motors built or released: 250 motors (unchanged)
  • Target efficiency test coverage: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Motor efficiency test workload rate = motors scheduled for efficiency test ÷ total motors built or released × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for motor efficiency test coverage, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for efficiency test coverage gap.
  • At this operating point the engine returns 8 count for motors scheduled for efficiency test.
  • At this operating point the engine returns 250 count for total motors built or released.

How this compares with the baseline

  • Against the tool's baseline example, where target efficiency test coverage sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • A figure at this level is achievable when target efficiency test coverage is genuinely sustained, not just peaked for a shift. It treats every motor as equivalent; it doesn't risk-weight by frame size or customer criticality, so a low overall rate can still be acceptable if the right high-risk units are tested.

Results at a glance

  • Motor efficiency test coverage: 3.2 % (headline result)
  • Efficiency test coverage gap: 95.8 points
  • Motors scheduled for efficiency test: 8 count
  • Total motors built or released: 250 count

Run it with your numbers

  • Every input above is editable in the live Motor Efficiency Test Workload calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.