Documentation/Modules/Motor Sizing

Motor Sizing

Indicative motor frame class, torque, and speed for power trains

Standards catalog

Validation: indicative · Method band: formula

Open calculator

Indicative method: Indicative closed-form or numerical model

Assumptions

  • Linear elastic material behavior unless noted otherwise.
  • User is responsible for load combinations and load factors per the selected design code.
  • Design standard (US/EU/ISO) sets unit defaults and screening check labels — not a full code worksheet.

Limitations

  • Professional screening / indicative workspace — does not replace a licensed PE or official code compliance review.
  • Where specialized evaluators are not implemented, checks map solver outputs to catalog templates for orientation only.

Engineering checks

CheckINDUSEUISO
Thermal duty vs frame classimplemented———
Rated torqueimplemented———

Motor Sizing (motor)

Purpose

Screen indicative motor frame class, rated torque, slip speed, and belt-drive service factor from required shaft power and pole count. Entry point for the connected power-train workflow (Motor → V-Belt → Shaft → Bearing → …).

Physics & theory

Induction motor synchronous speed: (rpm) with line frequency (Hz) and pole count . Rated speed includes slip (typically 2–5%). Shaft torque with .

Frame classes follow indicative NEMA/IEC power–speed bands (screening only, not vendor catalog selection).

Inputs

ParameterDescription
powerRequired mechanical shaft power
polesMotor pole count (2, 4, 6, 8)
lineFrequencyHz50 or 60 Hz supply
serviceClassContinuous, intermittent, or short-time duty
startingTorqueFactorStarting torque / rated torque
efficiency, powerFactorElectrical load estimates

Outputs

  • Synchronous and rated speed, slip, rated/starting torque, indicative frame class, suggested belt service factor.

Cross-module handoff

On Calculate, publishes power (kW), speed (rpm), and serviceFactor to the V-Belt Drive module.

Verification

  • CI: motor-indicative-01.json
Maintainer note: Unclassified module. Add explicit maturity metadata.