Spin a Roma per il Feko USer Day: presentazione portafoglio elettromagnetico Altair con focus Alta Frequenza - Antenne, software FEKO, analisi multifisica.

1. SPIN Applicazioni Magnetiche Srl ©SPIN Applicazioni Magnetiche www.spinmag.it

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

24. SPIN Applicazioni Magnetiche www.spinmag.it
Flux: electric motor
• Internal Permanent Magnet motor: vibroacoustic analysis
Mode 1
(425 Hz)
Mode 12
(2633 Hz)
Mode 23
(4103 Hz)
Mode 5
(1091 Hz)
Modal analysis results on stator

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

30. SPIN Applicazioni Magnetiche www.spinmag.it
Activate
• Electric drive simulation: 3PH - Internal
Permanent Magnet generator starting transient
PID controller
Flux-Activate
link block
Mechanical
equation
Reference
voltage (step)
Flux – Activate cosimulation
Internal combustion
engine (prime mover)

31. SPIN Applicazioni Magnetiche www.spinmag.it
Activate
Flux – Activate cosimulation
• Electric drive simulation: 3PH - Internal
Permanent Magnet generator starting transient
Phase voltages
Angular speed
ICE torque

32. SPIN Applicazioni Magnetiche www.spinmag.it