FEMAG
Electromagnetic FE simulation of electric machines
Software OverviewWHAT IS FEMAG?
FEMAG is a multi-physics modeling software tool built to streamline motor design and analysis. It uses a 2-dimensional finite element approach to accurately capture motor behavior and can couple the electromagnetic, thermal, mechanical and transient behaviors together to quickly bring a multi-physics approach to motor analysis.
Mature, Accurate ElectromagneticsAN ELECTROMAGNETIC SOLUTION 40 YEARS IN THE MAKING
Development of FEMAG started in 1982 by Professor Reichert at the Institute for Electrical Machines of ETH Zurich and has been continuously developed by pioneering research institutes since then. Research and development will continue to be led by the FEMAG Consortium, which includes GT’s Center of Excellence for Electric Drives, University of Aalen, and University of Hannover.
MultiphysicsELECTROMAGNETIC, THERMAL & MECHANICAL EFFECTS
FEMAG not only models the electromagnetic behavior of a motor, but also the thermal behavior, mechanical behavior, and its transient behavior in an electric circuit. With its foundation rooted in multi-physics, FEMAG can be used to solve critical motor design challenges that pure electromagnetic modeling software can’t, such as mechanical deformation studies that consider electromagnetic forces, centrifugal forces, and thermal expansion or magnet de-magnetization studies that consider magnet press fit and thermal expansion forces.
Automated WorkflowsINTEGRATION STREAMLINES MOTOR MODELING PROCESSES
Integration of FEMAG into GT-SUITE with GT-FEMAG has enabled seamless and automated workflows to be setup to have FEMAG results feed GT-SUITE system-level models with accurate motor inputs, such as the automatic generation of efficiency maps, automatic generation of equivalent circuit models (i.e Ld, Lq models), and automatic generation of local heat rejection maps for transient thermal analysis.
ADVANCED FEATURES
- Generate initial rotor and stator sizing and geometry given torque and speed requirements
- Generate maps of the global efficiency and local losses for system-level simulation
- Define any motor geometry with parameterized geometry, custom geometry with CAD import, or create custom parameterized geometry templates
- Calculate natural frequencies and mode shapes with modal analysis
- Calculate stator deformation with electromagnetic forces, centrifugal forces, and thermal expansion all considered
- Study de-magnetization of magnets due to both thermal expansion and press fit forces
- Calculate harmonics of motor forces and torques while considering behavior of inverter from GT-PowerForge
- Understand transient effects of motor on the electrical circuit
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With seamless workflows available between FEMAG and GT-SUITE, maps of the global efficiency and local losses can be used in GT’s transient system-level and thermal modeling environments to study warmup and cool down events in electric drivetrains. To learn more, see the conference presentation here.
Using GT-PowerForge, FEMAG, and GT-SUITE for detailed inverter modeling, electromagnetics modeling, and harmonic analysis, respectively, users can understand the effects of the inverter design, motor design, and mechanical design on noise, vibration, and harshness of the entire electric powertrain.
With transient-capable electromagnetic and thermal solvers, users can analyze the demagnetization of permanent magnets during crucial safety events, such as short circuits.
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