How do you calculate motor test capacity?

Multiply motors tested per cycle by available cycles to get gross slots, then multiply by uptime and first-pass yield. With 4 motors per cycle over 180 cycles at 92% uptime and 97% yield, accepted capacity is about 643 motors.

What is the difference between gross slots and accepted capacity?

Gross slots is the theoretical maximum, here 720 motors. Accepted capacity, about 643, is what survives after 57.6 motors of downtime loss and 19.9 of yield loss.

What is a good first-pass test yield for e-bike motors?

Mature hub and mid-drive lines usually run 96-99% first-pass at end-of-line function test. The 97% in this example sits in that band; below 95% the rework queue starts eating capacity and labor.

How much capacity does downtime cost?

At 92% uptime the station loses 8% of its 720 gross slots, or 57.6 motors, before yield is even considered. Pushing uptime to 96% would recover roughly 29 motors of capacity.

Uptime vs yield, which hurts capacity more here?

In this case downtime loss is 57.6 motors versus 19.9 from yield, so station availability is the bigger lever. Always check both losses side by side before investing in either area.

Why are accepted motors not a whole number?

The calculation chains percentages, so it returns 642.5 motors as a planning figure. Round down to 642 for committed capacity since you cannot ship half a tested motor.

Bicycles, E-Bikes & Micromobility calculator

Motor Test Capacity Calculator

End-of-line motor testing is the gate before hub and mid-drive motors get married to a frame, and it is a common throughput bottleneck on e-bike lines. This calculator converts raw test-station slots into accepted motor capacity after subtracting station downtime and first-pass test failures. Production planners and test engineers use it to confirm the dyno or function-test bench can keep up with assembly, and to quantify how much capacity uptime and yield problems are quietly stealing. Knowing the accepted number, not the theoretical number, is what keeps the assembly line fed.

What this calculator does

Estimate accepted e-bike or scooter motor test output from motors tested per cycle, available cycles, station uptime, and first-pass test yield.
an e-bike or scooter assembly line needs to confirm motor test capacity before committing a daily or weekly production schedule
It computes how many motors actually pass test by derating gross test slots for station uptime and first-pass yield.

Formula used

Gross motor test slots = motors tested per cycle × available motor test cycles
Accepted motor test capacity = gross motor test slots × motor test station uptime × motor first-pass test yield

Inputs explained

Motors tested per cycle:
Available motor test cycles:
Motor test station uptime:
Motor first-pass test yield:

How to use the result

Use it when sizing a motor test bench, checking whether test capacity matches assembly demand, or quantifying losses from downtime and rework.
It models first-pass yield only; motors that pass on retest are not added back, so true accepted capacity may be slightly higher if you rework and retest failures.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate motor test capacity? Multiply motors tested per cycle by available cycles to get gross slots, then multiply by uptime and first-pass yield. With 4 motors per cycle over 180 cycles at 92% uptime and 97% yield, accepted capacity is about 643 motors.
What is the difference between gross slots and accepted capacity? Gross slots is the theoretical maximum, here 720 motors. Accepted capacity, about 643, is what survives after 57.6 motors of downtime loss and 19.9 of yield loss.
What is a good first-pass test yield for e-bike motors? Mature hub and mid-drive lines usually run 96-99% first-pass at end-of-line function test. The 97% in this example sits in that band; below 95% the rework queue starts eating capacity and labor.
How much capacity does downtime cost? At 92% uptime the station loses 8% of its 720 gross slots, or 57.6 motors, before yield is even considered. Pushing uptime to 96% would recover roughly 29 motors of capacity.
Uptime vs yield, which hurts capacity more here? In this case downtime loss is 57.6 motors versus 19.9 from yield, so station availability is the bigger lever. Always check both losses side by side before investing in either area.

Last reviewed 2026-05-12.