ThermNet

ThermNet couples with MagNet or ElecNet for
accurate temperature predictions.


ThermNet simulates the steady-state and transient temperature distribution of specified heat sources. Coupling with MagNet and ElecNet provides accurate electro-thermal analysis for devices such as electric machines (motors and generators), transformers, induction heating, surge arrestors and dielectric heating.
Overview
Features
Applications
Overview

ThermNet accurately simulates the temperature distribution as a result of heat rise or cooling in your electromechanical device. ThermNet seamlessly couples to MagNet's electromagnetic and ElecNet's electric field simulations for further analysis: use power loss data from MagNet and ElecNet as a heat source and determine the impact of temperature changes on the overall design and performance.

  • Simulates the temperature distributions caused by specified heat sources in the presence of thermally conducting materials
  • Coupling with MagNet for heating effects due to eddy current and hysteresis losses in the magnetic system
  • Coupling with ElecNet for heating effects due to electric losses

Each solver module is tailored to different design problems and is available separately for both 2D & 3D designs.

Static or steady-state thermal simulation
  • Determines the non-linear steady-state temperature distributions caused by specified heat sources
  • Accounts for heat transfer due to conduction, convection and radiation
  • Both adiabatic and non-adiabatic thermal processes can be simulated.
  • Couples with all MagNet electromagnetic field solvers
  • Couples with transient, current flow and time-harmonic electric field solvers in ElecNet

Transient or time-varying thermal simulations
  • Determines the non-linear steady state temperature distribution caused by specified heat sources
  • Accounts for heat transfer due to conduction, convection and radiation
  • Both adiabatic and non-adiabatic thermal processes can be simulated.
  • Adaptive, fixed interval and user defined time stepping
  • Second-order time stepping
  • Resume Feature: pause at a particular time step for inspection
  • Couples with all MagNet electromagnetic field solvers
  • Couples with transient, current flow and time-harmonic electric field solvers in ElecNet


Features

Geometric Modeller
  • Easy to use Extrusion-Based and Solid Modelling tools make even the most complicated designs quick and painless to draw.
  • 3D ACIS Modeler from Spatial, with DXF/SAT imported natively.
  • Additional filters allow CAD files to be imported efficiently, including the coils. Formats include STEP, CATIA, Pro/E, IGES
  • Coil Creator Tool - add common coil types from template or easily create custom coil types
  • Full Boolean operations and multi-sweep functions for complex geometries
  • Disable components of the device for thermal simulation (relative to electromagnetic field simulation)
Material Library
  • Pre-defined library of materials
  • User-defined materials easily added with Material Editor & curve fitting utilities
  • Simple Drag-and-Drop applies a material to any part of the model, which is then stored with the model.

Meshing & Adaption
  • Adaptive strategy determines where refinements are needed after each step by:
    • Subdividing elements (2D/3D)
    • Increasing the polynomial order (3D)
    • Both techniques combined (3D)
  • Mesh layers for skin depth analysis and highly anisotropic volume elements
  • Separate mesh for coupled thermal problems (with ThermNet)
  • Extensive manual meshing controls

Parametric Studies & What-if Analysis
  • Perform multiple experiments for "What if?" analysis
  • Any quantity can be parameterised (e.g. geometric features, materials, mesh settings) and can be varied through a user-specified range of values
  • Multi-parameter solutions, with automatic display of solution vs. Parameter values (including animations).

Customisation & Interoperability
  • Powerful scripting allows MagNet to work with any programming environment that implements ActiveX scripting and OLE Automation (such as Visual Basic Script, Java Script, Perl, etc.).
  • ThermNet can then be coupled to any Active-X compliant application such as Microsoft Office, Matlab, MathCad, AutoCAD etc.

Scripting
  • Automate repetitive tasks
  • Link to third party software such as Excel® or MatLab®
  • Customize ThermNet for your needs

Results - Quantities, Fields & Charts
  • Magnetic Heat Sources
  • Electric Heat Sources
  • Thermal Heat Sources
  • Heat Flow
  • Temperature
  • See MagNet for details on electromagnetic fields and quantities of coupled solves, which include:
    • Eddy current and hysteresis losses
    • Demagnetization

Post-Processing
All of the data is available in a variety of formats and easily accessible with the Post-Processing and Project toolbars:
  • Detailed field visualizations
  • Charts
  • Field probing
  • Export to Excel

Applications

A few of the Applications pages specifically cover the use of ThermNet, namely:

Application Name Model Available
MagNet ElecNet ThermNet OptiNet Other

Calculating the steady-state ohmic and core losses in a BLDC motor with temperature effects

Yes Yes   Yes    

Induction heating of a workpiece past the Curie point

Yes Yes   Yes    

Coil size optimization - induction heating

Yes Yes   Yes Yes  

Thermal characteristics of a 330 KV surge arrester

Yes   Yes Yes    

Gas Insulated Switch

  Yes Yes Yes