Motors, Generators & Electrification Equipment worked example

Motor Test Stand Capacity at 99% test stand uptime: a worked example

Push test stand uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when a motor test stand is being asked to take on more units and you need to know if there is room after uptime and yield losses.

The inputs for this scenario

  • Motors tested per test cycle: 4 motors / cycle (unchanged)
  • Available test cycles per shift: 480 cycles (unchanged)
  • Test stand uptime: 99 % (raised for this scenario; the documented default is 90)
  • First-pass test yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross test capacity = motors tested per cycle × available test cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good motors per shift, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross test capacity.
  • At this operating point the engine returns 19.2 units for test stand downtime loss.
  • At this operating point the engine returns 57.02 units for retest yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where test stand uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 10% above the baseline at 1,844 units.
  • It computes good (passing) motors per shift by multiplying motors per cycle by available cycles, then derating for test stand uptime and first-pass yield. 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

  • Good motors per shift: 1,844 units (headline result)
  • Gross test capacity: 1,920 units
  • Test stand downtime loss: 19.2 units
  • Retest yield loss: 57.02 units

Run it with your numbers

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

Last reviewed 2026-05-12.