How do you calculate good stator winding capacity?

Multiply stators per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. Here 4 x 480 = 1,920 gross, x 90% x 97% gives about 1,676 good stators.

What is the difference between gross and good capacity?

Gross capacity assumes every cycle runs and every stator passes. Good capacity discounts for machine downtime and defects. In this example gross is 1,920 but good is 1,676 — a 244-stator gap you should not promise away.

Should I improve uptime or yield first?

Compare the loss lines. Here downtime costs 192 stators and yield loss costs about 52, so uptime is the larger leak — chase machine availability before winding quality in this case.

What is a good first-pass yield for stator winding?

Mature copper winding lines run 96-99% first-pass yield. The 97% used here is realistic; dropping to 94% would cut good capacity by roughly another 58 stators on this same base.

How does uptime affect winding capacity?

Uptime scales gross capacity directly. At 90% uptime you lose 192 of 1,920 stators to downtime; lifting uptime to 95% would recover about 96 of those stators before yield is even considered.

Why multiply uptime and yield instead of adding the losses?

Because yield acts only on the stators the machine actually produces during uptime, the two factors compound. Multiplying them avoids double-counting and gives the true shippable count.

Power Electronics, Motors & Drives calculator

Stator Winding Capacity Calculator

Stator winding is often the pacing operation in electric-motor manufacturing, and gross machine capacity rarely equals shippable output once downtime and winding defects are counted. This calculator takes stators per cycle and planned cycles to get gross capacity, then discounts for machine uptime and first-pass yield to give good-stator capacity, plus a clean breakout of downtime and yield losses. Winding-line supervisors, industrial engineers and S&OP planners use it to commit realistic build numbers and to see whether uptime or yield is the bigger leak. Committing to gross capacity instead of good capacity is how winding lines end up 10-15% short of plan.

What this calculator does

Estimate good stator winding output from stators per cycle, planned cycles, uptime, and first-pass yield.
Use it when checking whether a stator winding cell can support motor build demand, launch ramp, or a service rewind backlog.
It computes gross and good stator winding capacity and splits the shortfall into downtime loss and yield loss.

Formula used

Gross stator winding capacity = stators completed per cycle × planned winding cycles
Good stator winding capacity = gross capacity × expected winding uptime × expected winding first-pass yield

Inputs explained

Stators completed per winding cycle:
Planned winding cycles:
Expected winding machine uptime:
Expected winding first-pass yield:

How to use the result

Use it during production planning, line balancing, or when deciding whether to chase uptime or yield for more output.
It multiplies uptime and yield as independent factors and assumes a stable cycle time; it does not model changeover-driven cycle variation between stator variants.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
The U.S. has 11,261 computer and electronic products establishments employing about 815,443 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate good stator winding capacity? Multiply stators per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. Here 4 x 480 = 1,920 gross, x 90% x 97% gives about 1,676 good stators.
What is the difference between gross and good capacity? Gross capacity assumes every cycle runs and every stator passes. Good capacity discounts for machine downtime and defects. In this example gross is 1,920 but good is 1,676 — a 244-stator gap you should not promise away.
Should I improve uptime or yield first? Compare the loss lines. Here downtime costs 192 stators and yield loss costs about 52, so uptime is the larger leak — chase machine availability before winding quality in this case.
What is a good first-pass yield for stator winding? Mature copper winding lines run 96-99% first-pass yield. The 97% used here is realistic; dropping to 94% would cut good capacity by roughly another 58 stators on this same base.
How does uptime affect winding capacity? Uptime scales gross capacity directly. At 90% uptime you lose 192 of 1,920 stators to downtime; lifting uptime to 95% would recover about 96 of those stators before yield is even considered.

Last reviewed 2026-05-12.