Spin a Roma per il Feko USer Day: presentazione portafoglio elettromagnetico Altair con focus Alta Frequenza - Antenne, software FEKO, analisi multifisica.
2. SPIN Applicazioni Magnetiche www.spinmag.it
Low-frequency electromagnetic
and thermal analysis for
electromechanical devices: an
overview of Altair suite
3. SPIN Applicazioni Magnetiche www.spinmag.it
Flux
• Electric applications
• Magnetic applications
• Thermal applications
2D/3D FEM-based low frequency
electromagnetic and thermal
simulation software
High frequency Low frequency
Maxwell equations
decoupling
E, D, B, H
4. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: preprocessing
• Mesh import tool from Simlab/HyperMesh
• Easy handling of complex geometries
Medium voltage disconnector
5. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: dielectric design
• Electrostatic application: Electric field distribution
Electric field isovalue (cross-section plane)
Electric ‘hot-spot’ detection
Electric potential distribution
Stray capacitance analysis
6. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: dielectric design
• Electrostatic application: Breakdown voltage
Weakest breakdown path
Ionization inception condition provided by a
fully automated Streamer Criterion, based
on the background electric field previously
computed.
Gaseous medium model:
- Air
- SF6
- User-defined
7. SPIN Applicazioni Magnetiche www.spinmag.it
Flux-Inspire: mechanical design
• Blow-off effect analysis: test on arcing horns
Blow-off force, due to current
spot constriction, has been
evaluated with Flux and
simulated using Inspire.
Global Lorentz force (left horn)
Displacement (left horn)
6 kA
6 kA
8. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: dielectric design
• Electrostatic application: Capacitance matrix
Choke filter frequency response
Electrostatic Steady State AC Magnetic
Export
The capacitances computed in DC condition
(Electrostatic application) can be imported in a
Magnetic AC SS model, which implements a
finite element-circuit coupling.
9. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: dielectric design
• Electrostatic application: Capacitance matrix
Choke filter frequency response
Resonances, capacitive behaviour
Impedance vs frequency
Mainly resistive-inductive effect
10. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: dielectric design
• Electric transient application
Effects of lightning on large power
transformer, turn-to-turn overvoltages analysis
Electric field distribution on cable joint
Voltage distribution along a winding [pu]
Ideal profile (low
frequency bound)
GND
GND
11. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: Inductive power transfer
• Wireless charging: AC SS Magnetic application
𝑘 𝑐𝑜𝑖𝑙 = 𝑀 𝐿 𝑝 𝐿 𝑠
Coupling coefficient versus coil position
Saturation effects modeled
Iron losses computation (Bertotti model)
Finite element-circuit coupling
Ferrite
plates
Coils
12. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: Inductive power transfer
Flux density arrows
Flux density isovalue (longitudinal cross-section plane)
• Wireless charging: AC SS Magnetic application
13. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: Inductive power transfer
Complex circuit topology analysis
and tuning with Flux-Activate link
• Wireless charging: AC SS Magnetic application
Generator reactive/active power versus frequency
Voltage
generator
Resonant frequency
(20 kHz)
14. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: Eddy current brake
• Application: Transient Magnetic 3D
Mechanical equation - finite element domain coupling
Saturation effects modeled
Non-meshed magnetic sources to speed-up simulation
Aluminum
disk
Iron core
Non-meshed coil
(DC supply)
Extrusive
mesh on disk
18000 rpm
15. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: Eddy current brake
• Application: Transient Magnetic 3D
Current density
distribution (disk)
Flux density isovalue (core)
18000 rpm
16. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: Eddy current brake
Surface magnetic forces distribution (iron core, upper pole)
Static analysis
Air gap variation
Export
Surface magnetic forces export to HyperMesh
for accurate mechanical analysis
Magnetic
forces effect
17. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: induction heating
Cosimulation available (‘Magneto-thermal
coupling’), to actualize the value of power
losses with time-varying temperature
Moving aluminum foil heating
(Application: ink drying)
Target power = 100 W
Thickness = 20 μm
Frequency = 100 kHz
Steady State AC Magnetic Transient thermal
Hexahedral meshes on foil
0,5 m/s
18. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: induction heating
Eddy current distribution on foil
Surface impedance formulation on coils (time
saving, proximity effect is taken into account)
Flux density on CutPlane (shown above)
19. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: induction heating
Lorentz/Laplace forces export to HyperMesh for accurate
mechanical analysis (Flux 2018 new feature)
DC component of force
Harmonic force
Export
Laplace force arrows (foil)
.NAS file
20. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: induction heating
Power density distribution export to AcuSolve
for detailed thermal analysis
CFD solver
Convective heat transfer
coefficient analysis
Radiative exchanges
Temperature distribution
Joule losses isovalue
.NAS file
Export
21. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: thermal analysis
Modeling capabilities
Phase transition and lattice rearrangement can be
simulated by using non-linear thermal properties
Anisotropic material
Spatially-dependent parameters
Specific
heat
Iron-Carbon phase transition diagram Gaussian model (E=phase transition energy)
22. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: electric motor
• FluxMotor tool for pre-design
• Fast model building with dedicated overlays
Operating point computation
Magnetic forces export for
vibro-acoustic analysis
Efficiency mapping
23. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: electric motor
• Internal Permanent Magnet motor: vibroacoustic analysis
Surface magnetic
forces export
Magnetic Transient 2D application
Forces on tooth
16th harmonic
Fx
Fy
x
y
25. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: electric motor
• Special application
Levitating rotor motor
Axial flux technology
CONDIDENTIAL
IMAGE
26. SPIN Applicazioni Magnetiche www.spinmag.it
Flux-Hyperstudy: optimization
Objective function
Design of experiment (DOE)
Multi-objective optimization
Advanced data mining and postprocessing
(correlation matrices, interaction effect plots)
• Link to optimization tool
.F2G file
27. SPIN Applicazioni Magnetiche www.spinmag.it
Flux-Hyperstudy: optimization
• Electric motor bemf optimization
Other objective
function optimizable:
Torque ripple
Cogging torque
Efficiency
Back-electromotive force
optimization
Permanent magnet
length
Objective:
Optimized
variable:
Harmonic distortion
reduction (-16%)
28. SPIN Applicazioni Magnetiche www.spinmag.it
Activate
• Electric drive simulation: 3PH - Surface
Permanent Magnet motor control
PI controller
Electric
motor model
Power
converter
Reference speed
(imposed)
Signal-based model
29. SPIN Applicazioni Magnetiche www.spinmag.it
Activate
• Electric drive simulation: 3PH - Surface
Permanent Magnet motor control
PWM supply voltage
Angular speed
(actual)
(reference)
d-q currents
Signal-based model