• The Challenge EM Simulation

    The Challenge EM Simulation

    Are you faced with such tasks: Are innovations permanently required? Measurements and experiments are not satisfactory? Is the Physics Complex? Time is short? Then we are here for you! On these pages we demonstrate MAGNETICS, an outstanding electromagnetic FE solver product that we develop for you. MAGNETICS, integrated in NX / Simcenter or as standalone, well known as NX Magnetics, is a comprehensive FEM software package to simulate and optimize electromagnetic devices. It is used by industry and science and either… Read More
  • Circuit Breakers

    Circuit Breakers

    Outstanding Features for the coupling of electromagnetic, elasticity, motion and thermal allow realistic simulations of circuit breakers and switchgears. The animation demonstrates the FEM simulation of a low-voltage circuit breaker. A voltage is applied to a coil (below), whereupon the plunger is pulled into the coil. The four contact bridges (above) are connected to the plunger and then press on their contact partners, whereupon the AC current flows through the lines. The Lorenz forces lead to small mechanical vibrations with… Read More
  • High-Frequency

    High-Frequency

    Thanks to the capability of a full wave solver, the analysis of antennas, waveguides or microwave ovens is another application area for electromagnetic simulation with Magnetics for NX/Simcenter. The picture shows as an general example the model of a microstrip patch antenna and its electric field result. Such antennas are becoming increasingly useful because they can be printed directly onto a circuit board. They are becoming very widespread within the mobile phone market. Patch antennas are low cost, have a… Read More
  • Individual Motor Designs

    Individual Motor Designs

    The application to simulate is a linear motor to be used in a future magnetic levitation railway. We publish this with kindly permission by HARDT GLOBAL MOBILITY. Download as PDF Read More
  • Transformers

    Transformers

    This example deals with a three phase medium power transformer. Goal is to find the main characteristics e.g. power and efficiency under normal operating conditions. Download as PDF Read More
  • Lightning Strikes

    Lightning Strikes

    Lightning strikes that occur in wind turbine towers can be analyzed to help for dimensioning of arrestors and to estimate the electric and magnetic field strengths that appear.This example shows how this kind of analysis can be done in Magnetics for NX/Simcenter. The tower is made of steel bars that conduct the lightning current down into the ground. Inside is a cable with an resistor in which we want to analyze the specific energy. Download as PDF Download NX Files… Read More
  • EMC, Electromagnetic Compatiblity

    EMC, Electromagnetic Compatiblity

    This example shows a FEM analysis of a Circuit Breaker that is placed in a carbon fiber box. Induced eddy currents and the shielding effect are investigated. Download as PDF     Download NX Files Video Read More
  • Customer Presentations

    Customer Presentations

    Following we demonstrate some presentations or papers published by industrial users and ourselves. Temperature Field and Power Loss Calculation With Coupled Simulations for a Medium-Voltage Simplified Switchgear. Electrica, 23(1), 107-120, 2023, A. Efe Şeker, B. Çelik, D. Yıldırım, E. Aslan Sakacı and A. Deniz. Optimierung eines PMSM Motors bezüglich Drehmoment und Ripple mit NX Magnetics und HEEDS. Presentation of Peter Binde at 2022 PLM Connection. Electrostatic discharge simulation using a GPU-accelerated DGTD solver targeting modern graphics hardware. COMPUMAG 2021. Jan.… Read More
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AC Cable near Car Sheet Body

This example shows an L-shaped cable bearing alternating current. The cable runs near to a body sheet of a car. The goal is to analyze the current distribution on a sheet metal in frequency domain.

Download as PDF

Initial Situation

AC-Cable near Body Sheet

This example shows an L-shaped cable bearing alternating current. The cable runs near to a body sheet of a car. At both ends it is connected to the body sheet so the current runs as well through the cable as well through the sheet. The question is how the alternating current will affect the sheet. Different frequencies have to be analyzed and also different material conductivity-values.

The goal is to analyze the current distribution on a sheetmetal in frequency domain. 

Requested frequencies: 
1 Hz, 25 Hz, 50 Hz, 200 Hz, 1000 Hz

Picture: L-Model for EMC TestsPicture: L-Model for EMC Tests

 

Appropriate Method

3D Magnetodynamic Frequencydomain Analysis

The cable and body sheet are CAD-modeled in NX. Also the air volume between them is modeled. In NX Advanced Simulation a Magnetics solution of type 3D Magnetodynamic Frequency is chosed. The forcing frequency is set to the demanded values. Meshing and material assignments complete FEM model. The solve process is repeated for the different frequencies.

The picture shows the mesh with the focus on the connection between the cable and the sheet.

Picture: Mesh with ConnectionPicture: Mesh with Connection

The next picture shows the mesh displayed from the buttom of the sheet. You can see the refinement in the area of the cable.

Picture: Bottom Side Mesh with RefinementPicture: Bottom Side Mesh with Refinement

 

Result

Eddy Currents in Body Sheet 

The results show the current distribution (Eddy Currents) of the induced current in the body sheet. It is clear to see that the higher the frequency becomes the more the eddy currents move to the L-shaped cable. With these results the customer can decide about the appropriate position of sensitive hardware devices.

The first picture shows the current distribution at 1 Hz. The current in the sheet is nearly not affected by the AC cable. It runs in the shortest way through the sheet.

Picture: Eddy Currents at 1 HzPicture: Eddy Currents at 1 Hz

The second picture shows the results of frequency 25 Hz. A small deviation compared to the 1 Hz result can be seen. Still there is nearly no effect of eddy currents.

Picture: Eddy Currents at 25 HzPicture: Eddy Currents at 25 Hz

The next picture shows the currents at 50 Hz. Notice the currents now beeing affected by the L-shaped cable. They more and more move to the position of the cable.

Picture: Eddy Currents at 50 HzPicture: Eddy Currents at 50 Hz

With 200 Hz as shown in the last picture the eddy currents have fully moved to the position of the L-shaped cable.

Picture: Eddy Currents at 200 HzPicture: Eddy Currents at 200 Hz

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