Motor CAD Software

Motor-CAD Therm


The Motor-CAD Therm module is the industry-standard tool for thermal analysis of electric machines, with over 20 years of inbuilt experience.

Motor-CAD Therm allows designers to calculate the temperature of the motor components in steady-state and transient operating conditions, enabling accurate modelling of thermal behaviour within seconds of calculation. Understanding the main heat transfer paths gives motor designers opportunities to significantly improve motor efficiency and output, and make design decisions with confidence.

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.


Machine Types

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

  • IM: Induction motors
  • SRM: Switched Reluctance motors
  • SYNCREL: Synchronous Reluctance motors
  • SYNC: Synchronous machines
  • PMDC: Permanent Magnet DC motors
  • IM1PH: Single Phase Induction motors
  • CLAW: Claw pole machines.


Key Features

  • Calculates the temperature of the motor components in steady-state and transient operating conditions.
  • Thermal and flow network is generated automatically.
  • 3D network includes radial and axial heat transfer.
  • Detailed visualisation and calculation of the slot cross section.
  • CFD, FEA and empirical correlations are behind all calculations.
  • Experience built into the software assists users in selecting appropriate manufacturing factors.
  • Enables accurate modelling of thermal behaviour within seconds of calculation.


Cooling Methods

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


Thermal Cooling Circuit


Learn about Motor-CAD Lab

Interested in finding out more? Our motor design specialists can help you understand whether Motor-CAD will meet your needs and arrange for you to evaluate Motor-CAD software for free. Fill out our contact form, or email us at and a member of the team will be in touch.

Latest News

Read our latest white paper on ‘Performance Analysis of Electric Motor Technologies for an Electric Vehicle Powertrain’

In our latest white paper, we discuss how different design choices, such as motor topology, winding type and cooling system, can be compared and evaluated with the overall system impact in mind.

Celebrating 20 years of Motor Design Ltd and Motor-CAD

Motor Design Ltd is proud to celebrate 20 years of Motor-CAD software! Read our interview with MDL founder and company president, Dr David Staton.

Latest software release – Motor-CAD v12

Motor Design Ltd is delighted to announce the release of Motor-CAD v12 — the latest version of our unique software package dedicated to the electromechanical performance of motors and generators and the optimisation of their cooling.

Motor-CAD European User Conference 2019

We are delighted to announce that Motor Design Ltd’s inaugural European Motor-CAD User Conference will take place on the 20th-21st February 2019, in Birmingham, UK. The two-day event will bring together engineers and researchers working on eMachine design to learn about technological developments, share best practice and discuss their challenges and approaches.

Workshop on ‘Design Trends and Performance Analysis of BEV & HEV Electric Machines’ at Motor & Drive Systems 2019

Dr. David Staton will be running a workshop on ‘Design Trends and Performance Analysis of BEV & HEV Electric Machines’ at the 2019 Motor & Drive Systems Conference in Orlando, Florida.

Electric Drive Tail Rotor Team wins Team Bronze Medal at 2018 RAeS awards

We are delighted to announce that the Electric Drive Tail Rotor Team, which included representatives from MDL, was awarded a Team Bronze Medal at the 2018 Royal Aeronautical Society awards ceremony in November.

Watch our webinar on ‘Accounting for AC Winding Losses in the Electric Machine Design Process using Motor-CAD’

Watch a recording of our recent webinar on ‘Accounting for AC Winding Losses in the Electric Machine Design Process using Motor-CAD’.

UK Training Course on the Design of BPM and Induction Motors – 16th-18th October 2018

Registration open for our training course on the design of brushless permanent magnet (BPM) and induction motors using Motor-CAD.

U.S. Motor-CAD Users Meeting and Training – 17th-21st September 2018

Register now to attend our U.S. Motor-CAD users meeting and training course, taking place from 17th-21st September 2018 in Mason, Ohio

MDL welcomes Michael Rubbo – dedicated customer support for Motor-CAD users based in the U.S.

Motor Design Ltd are delighted to introduce Michael Rubbo, who will be supporting Motor-CAD users based in the U.S. as a Lead Applications Engineer.


ECCE 2019 – Baltimore, MD, U.S.A, 29th September – 3rd October 2019

Motor Design Ltd will be presenting at ECCE 2019 in Baltimore, MD.

Electric and Hybrid Vehicle Technology Expo – Novi, Michigan, U.S.A, 10th – 12th September 2019

Motor Design Ltd will be exhibiting at the Electric and Hybrid Vehicle Technology Expo 2019.

ACEMP-METU – Istanbul, Turkey, 27th – 29th August 2019

Motor Design Ltd will be delivering a tutorial on ‘Practical design aspects for electrical machines in power traction applications for Electrical Vehicles’ at the 2019 ACEMP-METU conference in Istanbul, Turkey.

Motor-CAD Workshop: Pordenone, Italy

MDL will be running a free, introductory Motor-CAD workshop on the 24th September in Pordenone (Italy), ahead of the Coiltech Tradeshow.

Motor-CAD North America User Conference 2019

The 2019 Motor-CAD North America User Conference will take place in October in Detroit.


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.