Motor CAD Software

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


FE-Therm Module

Motor-CAD uses powerful analytical methods to calculate the performance of electric machines and cooling systems.

The Motor-CAD FE-Therm add-on module provides increased detail on conduction heat transfer in various components. For example this allows visualisation of the hotspot in the winding.

It can be used to analyse conduction heat transfer for complex geometries such as multi-layer interior magnet motor rotors.

FE-Therm can be used to calibrate analytical lumped circuit models, thus improving accuracy.

It is fully automated and takes only a few seconds to calculate.

This image shows an automatic model generation with detailed conductor mesh:

The image below is a form wound machine showing the winding hotspot:

This shows slot water jacket cooling with two cooling ducts inside the slot:

This shows magnet losses impacting on temperatures:

The features in the FE-Therm module allow for a full 3D model of the machine to be generated with results as shown here:

Latest News

MDL Torque Issue 33: November 2017

Switched Reluctance Machine E-Mag
Welcome to new staff
Motor CAD User Meeting & Training in USA

Motor Design Headquarter relocation

Due to expansion Motor Design Ltd head office has relocated on 18th September 2017. Please note our new postal address is 5 Edison Court, Wrexham Technology Park, Wrexham , LL13 7YT, UK. Our telephone number and email addresses have not changed.

MDL Torque Issue 32: September 2017

Ariel Hipercar Unveiled
New Office for MDL
Upcoming Events

MDL Torque Issue 31: August 2017

Motor-CAD Lab Speed Increase
Summer Interns
Upcoming Events

MDL Torque Issue 30: June 2017

Success at Exhibitions
Welcome to new Intern
Upcoming Events

MDL Torque Issue 29: May 2017

Double Rotor Cage Induction Machine
Motor-CAD Training Course on Design of BPM Motors
Motor Design Ltd Welcomes Sara Roggia
Upcoming Events

MDL Torque Issue 28: April 2017

Cut edge analysis using Motor-CAD FEA
Launch of MDL Film
Motor-CAD training in China
Upcoming Events

MDL Torque Issue 27: March 2017

FEA Measurement Functionality
New IPM Magnet Geometries
Launch of web-site
Welcome to Erasmus Student

MDL Torque Issue 26: February 2017

Square Wave Drive Mode
Welcome to new staff
Presentation at Advanced E-Motor Technology 2017

MDL Torque Issue 25: November 2016

MDL Motor Design Training Course, 15th – 18th November 2016, Oswestry, UK
IET Seminar on Practical Control of Salient PM Motors
IEEE IAS Chapter Prominent Lecture on Practical Aspects in the Design & Analysis of Electric Machinery for Power Traction Application


Designing Electric Powertrains for Low Noise Workshop, California, December 06, 2017

Dr Mircea Popescu will attend the workshop. For more information and registration, please click here.

EDPC, Wuerzburg, 5th – 6th December 2017

Dr Unai San Andres Sanz is presenting: The impact of the manufacturing processes on the performance of electric machines For more information, please click here.

Electric & Hybrid Aerospace, Cologne, 16th – 17th November 2017

Dr David Staton will give a presentation. For more information, please click here.

Webinar – Optimal layout of electric machines using Motor-CAD and ANSYS optiSLang, 8th November 2017

Date: Wednesday 8th November 2017 at 8am or 4pm GMT. For more information and registration, please click here.

Design of Brushless Permanent Magnet Motors, 7th – 8th November 2017

This course will contain a mix of theory and design practice. Day 1: An Introduction to Brushless Permanent Magnet Motors & the design procedure. Day 2: An Interactive design & modelling workshop. Motor Design Ltd training course will be taking place 7th and 8th of...

EDPE, Duvrobnik, 4th – 6th October 2017

Dr David Staton will attend the conference. For more information, please click here.

ECCE, Cincinnati, 1st – 5th October 2017

Dr Mircea Popescu and Dr James Goss will be at the Expo For more information please click here.

Motor-CAD Users Meeting and Training – 27th to 29th September 2017

This course will contain a mix of theory and design practice. Day 1 will concentrate on Electromagnetic & thermal design of BPM motors, Day 2 will concentrate on Electromagnetic & thermal design of AC electric motors and Day 3 will concentrate on Electromagnetic &...

CoilTech, Pordenone, 27th – 28th September 2017

Dr David Staton will be given a presentation. For more information, please click here.

Romax European Users Forum, Paris, 26th – 27th September 2017

Dougie Hawkins will be presenting on the NVH performance of IPM machines for traction applications. For more information, please click here.


The Motor-CAD software is distributed worldwide. Our carefully selected partners are experts in the use of the software and can provide support and training.

To find a distributor near you, click on the link below.

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