Motors, Generators & Electrification Equipment worked example

Insulation Varnish Cure Load at 7.2% load, heat-up and cool-down allowance: a worked example

This worked example runs the insulation varnish cure load numbers for a tougher week than the baseline: 7.2% load, heat-up and cool-down allowance instead of the typical 10%. Estimate the oven cure time for a batch of varnished or VPI-treated motor windings so process teams can plan oven loading, schedule cure cycles, and keep the line flowing.

The inputs for this scenario

  • Windings to varnish-cure: 120 windings (held at the documented default)
  • Oven cure throughput: 12 windings / min (held at the documented default)
  • Load, heat-up and cool-down allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base cure time = windings to cure รท oven cure throughput.
  • Required cure time works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base cure time works out to 10 hr at these inputs.
  • Load and cool-down allowance applied works out to 7.2 % at these inputs.
  • Oven cure throughput works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where load, heat-up and cool-down allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • Use it when sizing a varnish oven, scheduling cure batches, or checking whether a winding line can keep the oven fed without starving downstream test. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required cure time: 10.72 hr (headline result)
  • Base cure time: 10 hr
  • Load and cool-down allowance applied: 7.2 %
  • Oven cure throughput: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Insulation Varnish Cure Load calculator, set load, heat-up and cool-down allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.