Rare Earth Magnet & Motor Materials worked example

Powder Yield at 99% target powder yield rate: a worked example

Push target powder yield rate up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when powder yield in rare earth magnet and motor materials needs a clean rate and gap-to-target you can put on a tier board.

The inputs for this scenario

  • Conforming NdFeB powder lots (pass size and oxygen spec): 8 count (unchanged)
  • Total powder lots milled and screened: 250 count (unchanged)
  • Target powder yield rate: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Powder yield rate = powder yield count ÷ total powder yield population × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for powder yield rate, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for powder yield gap to target.
  • At this operating point the engine returns 8 count for powder yield count.
  • At this operating point the engine returns 250 count for total powder yield population.

How this compares with the baseline

  • Against the tool's baseline example, where target powder yield rate sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • It computes the percentage of powder lots that meet spec out of all lots processed, and how many points that sits below your target. 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

  • Powder yield rate: 3.2 % (headline result)
  • Powder yield gap to target: 95.8 points
  • Powder yield count: 8 count
  • Total powder yield population: 250 count

Run it with your numbers

  • Every input above is editable in the live Powder Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.