Motor Design Limited

Motor-CAD Thermal

The thermal model in Motor-CAD is based upon analytical lumped-circuit analysis making it extremely fast to calculate. This allows the user to perform 'what-if' calculations in real time. Alternative numerical methods typically require days or even weeks to model and several hours to calculate a solution.

All the thermal resistances and capacitances in the Motor-CAD model are calculated automatically from geometric dimensions and material properties. The user does not need to be familiar with complex heat transfer phenomena such as dimensionless analysis correlations for convection. Motor-CAD automatically selects and solves the most appropriate formulation for a given surface and the cooling type selected. Motor-CAD features efficient, accurate and robust mathematical algorithms for forced and natural convection, liquid cooling, radiation and conduction. An extensive library of proven laminar and turbulent convection correlations are used to give accurate models for all internal and external surfaces. The airgap model includes laminar, vortex and turbulent convection.

The software is used to optimise the cooling of a wide variety of motor types and cooling methods. The fast calculation speeds are huge benefit when modelling complex duty cycles, such as traction motor drive cycles, and applications such as elevator load cycles.

Thermal Complex Duty Cycle

Motor-CAD modules are available for the following motor types:

  • Brushless permanent magnet motors (BPM)
  • Outer rotor BPM motors
  • Induction motors
  • Permanent magnet DC machines
  • Switched reluctance motors
  • Synchronous¬†reluctance motors
  • Synchronous machines
  • Claw pole machines
  • Universal motors

There are many different motor types, housing types and cooling types available in Motor-CAD.

Thermal Radial Cross Section

Motor-CAD models are available for the following cooling methods:

  • natural convection (TENV)
  • forced convection (TEFC)
  • through ventilation
  • water jackets (several configurations)
  • submersible
  • flooded
  • wet rotor and wet stator
  • spray cooling
  • radiation
  • conduction

Users are also able to include various mounting configurations in the model that can provide heating or extra cooling to the machine.

Thermal Cooling Circuit

Please click on the links below for further information:


Motor-CAD FE-Therm

Motor-CAD BPM EMag

Motor-CAD IM EMag

Click here to learn more about Motor-CAD Thermal.

For a full list of our thermal papers click here.

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