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Electro Technics Design

OOFELIE::ElectroTechnics, integrates ElectroMagnetics, ElectroStatics & ElectroKinetics capabilities but its functionalities go far beyond pure EM through its strong coupling with all other multiphysics simulation fields such as thermo-mechanics and vibro-acoustics so you can analyze many systems such as uch as sensors, motors, EMC, cabling, microwave, induction heating but also Electromagnetic actuators, active loudspeakers, current breakers with mechanisms etc...

Electro Technics Design

Electromagnetic Designer examples: Maxwell Equation based solver(top-left), Pressure Sensor simulation based on Piezo-Resistive effects (top-right), Homopolar motor magnetic induction(bottom-left), Thermal treatment through Eddy current induction (bottom-right)

The Electromagnetic Designer’s core strengths encompass:

  • Engineering standard, intuitive, time-saving design flow, giving full control through scripting, circuit networks, parameterization and optimization. Driven by a world leading CAD/CAE environment.
  • Solver optimized for efficient handling of industrial size electrotechnic problems.
  • Full strong coupled simulations enable comprehensive simulation of real-life electro-thermo-mechanical problems

Key Features

Highlights
Design - Abilities
  • Magnetostatic
    • Linear
    • Non-linear
  • Magnetodynamic
    • Harmonic
    • Transient
      • Linear
      • Non-linear
  • Material non-linearities
  • Passive conductors (eddy currents)
  • Piezo resistive materials
Applications
Publications

Highlights

Industry Standard Design Flow

CIRCUITBREAKER_600
flow_600

Intuitive Left-to-Right Design Flow

modeler
Use the full CAD interface for parameterized modelling of your structures. Link into the mechanical design flow by importing and manipulating files from various vendors (STEP, IGES, CATIA ..)
anal
In a second step, use the hierarchical UI to assign the different multi physical material properties to each component. Make use of a pre-defined material data base to increase your efficiency.
mesh
The third step is to define the mesh of your structure. Take the most accurate and efficient approach by using the full spectrum of mesh shapes (tetrahedron, pentahedron, hexahedron,...), mesh orders (linear, quadratic) and mesh generation (Delaunay-Voronoi, Frontal, ...) methods.
solver
In the Electro Magnetics domain, you solve for the static, transient & harmonic response of your parameterized system. Further combine with thermomechanical analysis . Move from verification to design by linking to optimization scripts or to Boss quatro for parametric analyses, design of experiments, multidisciplinary optimization, sensitivity & statistic analysis.
results
After simulation, you will find the results in the solution tree of the hierarchical UI. The results can be 3D plots as well as animations and sound files! Finally results are easily exported to other tools for further postprocessing.

Magnetic Shielding EMC/EMI

Magnetic shielding EMC/EMI problems are widely encountered in real life, We find magnetic shielding devices in spacecrafts in order to protect the human occupants from any deadly solar emissions, in rooms or equipments (such as electron scanning microscopes) where the external fields (such as the earth’s magnetic field) must be avoided, but also simply in computer screens to prevent from interferences.

In this example we study a magnetic shield used in a medical investigation room. The radiative source consists of a magnetic core with high permeability surrounded by a winded coil. A magnetic screen (with high permeability) is surrounding the core and the coil to block the magnetic field.

On the left, we see the magnetic field decreases drastically when passing through the magnetic shield.The right part shows a plot of the evolution of the vertical component of the magnetic induction along the main axis.

The following example illustrates cable shielding. Indeed, some applications impose that the magnetic field generated by cables which are placed underground cannot exceed a certain strength at the ground level. One way to obtain a sufficient decrease is to place magnetic screens near the cables.

The picture illustrates the induction lines around the cables and the shielding device. We can deduce that the magnetic screen is efficient and that the magnetic induction is weak in the regions we plan to insulate (the zones between the cables and under the shielding device). It is also possible to observe the channeling effect of the magnetic screen.

Inductive Material Treatment

This application illustrates the strong coupling between magneto-dynamic and electro-thermo-mechanic simulation. The electromagnetic fields generate induced eddy currents. These currents in return generate heat through the Joule effect. This heat is than responsible for local phase transitions and thermo-mechanic effects increasing the metal hardness.

The advantage of inductive heating is that you can control very accurately the heating process with regards to size of the heathed surface, heating time and penetration depth.

On the left, we see the distribution of the magnetic induction in the region surrounding the device. The alternating inductor current generates an alternating magnetic field which results in the appearance of eddy currents in the conductor part. These currents, located at the periphery of the device, are illustrated on the center picture. On the right we observe the Joule dissipation caused by the Eddy currents.

EM Valves: Compute EM forces On Moving Parts.

A parameterized study to compute the EM forces acting on moving parts (red part) as a fonction of their position (in z axis and centering mistake)

In electromagnetic valve simulations, the total force on the mobile part is predicted using a non-linear magnetostatic solver since some parts are made of materials with non-linear HB law. Here, a parametric study was performed to retrieve automatically the «Force vs Displacement» curve. (EM valve, courtesy of TECHSPACE AERO)

Piezoresistive Sensors

The piezoresistive effect describes the changing electrical resistance of a material due to applied mechanical stress.

Piezoresistive pressure sensors are a basic part of MEMS technology. They are used in biomedical applications, automotive industry and household appliances.

The sensing material in a piezoresistive pressure sensor is a diaphragm formed on a silicon substrate. Pressure causes bending of this diaphragm and in return deforms its the crystal lattice. This deformation causes a change in the band structure of the piezoresistors that are placed on the diaphragm, leading to a change in the resistivity of the material. This change can be an increase or a decrease according to the orientation of the resistors.

In the simulation below we have placed a piezoresitive layer on a bending beam. By putting pressure on this beam, the piezoresitive layer is stretched and at the regions of highest deformation, we can see how this affects the electrical resistance.

Applications

Electromagnetic actuation (Magnetodynamics)

This last application is the simulation of the electromagnetic actuation of a very small conductor pipe with ellipsoidal cross-section. This kind of actuation allows for example to control a fluid flow passing through the pipe by sequencing the different coils placed along the wall.

Induction heating (Magnetodynamics)

When a conductor is placed in a variable magnetic induction, eddy currents appear at its surface (and in a depth depending on the frequency of the excitation current, on the electric conductivity and on the magnetic permeability of the material). These currents cause power dissipation by joule effect and an increase in the conductor’s temperature. The aim of this example is to heat one tooth of a milling cutter for maintenance purposes. An inductor submitted to a sinusoidal electromotive source is placed close to the tooth we want to heat. It generates eddy currents in the milling cutter and consequently a local heating.

Windscreen deicing (Electrokinetic)

This example illustrates a simulation of the electric deicing of a rear car windscreen. The simulation performed here consists in computing the evolution of the windscreen’s temperature during the heating process in given conditions (outer and inner temperature, convection coefficient…). The solver handles variation of the materials’ resistivity (and consequently of the dissipated power) according to temperature, which allows a more accurate simulation of the deicing process.