13 ephysics n
TRANSCRIPT
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ePhysics
Thermal
Stress
EM
Qing-Ming Chen
Senior EM Engineer
Ansoft Japan2004.3.16
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What is ePhysics?
ePhysics extends the capability of AnsoftsMaxwell & HFSS, with new coupled-analysis
capabilities.
3D Thermal Transient Analysis
3D Thermal Steady-State Analysis
3D Linear Stress Analysis
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Thermal Analysis Features
w Heat Transfer Mechanismsw Conductionw Convectionw Radiation
w
Volumetric and SurfaceSource/Boundary Conditionsw Automatic Power Loss Mapping
from EM Analysisw Executive Parameters
w Average Temperature
w Temperature of Hot/Cold spotsw Coordinates of Hot/Cold spots
COUPLES WITH MAXWELL, HFSS, STRESS
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Stress Analysis Features
w Automatic field mapping
w EM Thermal Stress
w Calculates Deformation &
Von Mises Stress Distributionsw Executive Parameters
w Maximum Principal Stress
w Orientation of Principal Planes
w Maximum Von Mises Stress
w Maximum Stress Coordinates
COUPLES WITH MAXWELL, THERMAL
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Maxwell - ePhysics Coupling
MagnetostaticEddy CurrentTransient w/Motion
Electrostatic
Stress
Thermal
Update Maxwell Parameters
Materials, Sources, Geometry
Optimetrics
Maxwell ePhysics
ForceDistribution
EM Field
Power LossEM Field
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Maxwell - ePhysics
w Coupled-Analysisw Magnetostatic Thermal
w Magnetostatic Stress
w Magnetostatic Thermal Stress
w Eddy Current Thermal
w Eddy Current Stress
w Eddy Current - Thermal Stress
w Electrostatic Stress
w Transient - Stress
w Thermal - Stress
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Electromechanical Applications
w MEMS
w Motor & Generator
w Electrical apparatus
w PCB Packages & IGBT
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Example 1:MEMSHeatuatorElectro-Thermal Actuator
Conduction SolverThermal
SolverStress Solver
Controlled Micro Machine
DC current
Displacement
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Example : DC Current SolverScalarPotential
DCC
urrent
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Example :Magnetostatic Solver
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Example :Thermal Solver
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Example :Stress Solver
Temperatureon the animated surface
Displacement
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Example :Strain Energy & Von Mises Stress
StrainE
nergyDensity
VonMisesEquivalentStress
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Example : Motor & Generator3D Induction Motor: EddyThermal
EddyMesh
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Example :Motor & Generator3D Induction Motor: EddyThermal
Rotor
Stator
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Example : Motor & GeneratorClaw Pole Alternator: Transient
Static Thermal
Claw Pole Alternator
Stress DistributionIn a tooth
Displacement in a toothMagnified x1000
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Example :Optimetrics + ePhysicsLoop AnalysisEddyThermalConductivity Calibration
Loop Analysis
Eddy
For Loss
ThermalFor Average T
Conductivity
Maxwell Optimetrics is needed
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Example :Optimetrics + ePhysicsLoop Analysis
EddyThermalConductivity Calibration
Model
Mesh in Thermal analysis
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Example :Optimetrics + ePhysicsLoop AnalysisEddyThermalConductivity Calibration
Distribution of Temperature
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Example : Optimetrics + ePhysicLoop Analysis
EddyThermalConductivity Calibration
Loop
Control Function
Set up Variable
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Example : Optimetrics + ePhysicsLoop Analysis
EddyThermalConductivity Calibration
Loop ResultConvergence!!
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Example 4: Packages
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Example 4: PCB
mKW
mKW
THROUGH
PLANEIN
/26.0/4.17
=
=
Layer 1 (FR4)
Layer 2 (FR4)
Layer i (FR4)
Layer N (FR4)
-4 layers of FR4
0.25 W/m K
-2 inner layerscopper 390 W/m K-35 m copper film (1oz/ft2)
Copper
26.000
04.170
004.17
=
Tensor of Thermal Conductivity
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Example 4: CPGA
Q vector
Temperature
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Example 4:SBGA90%Vector distribution2W
1.14 W
0.66 W
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Example 4:PCB Analysis
Temperature distribution on cut-planes
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Example 4:IGBT Application
Hot spots indevice
Temperature distributionAverage temperature of wire
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HFSS - ePhysics Coupling
HFSSThermal
Stress
ePhysics
Power LossGeometryTemperature
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High Frequency Applications
w HFSS-Thermal
w RF Heating
w Packaging
w High Power Components
w Filters
w Biomedical
w HFSS-Thermal-Structural
w
MEMS, Filters
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BGA PackageHFSS-Thermal
Temperature Distribution
due to losses in:
ChipBond WiresLeadsDielectrics
courtesy of TNO-FEL, the Netherlands
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15 MHz Pass Band FilterHFSS-Thermal-Stress
Transmission (S21)
Reflection (S11)
Final temperaturedistribution
Deformation
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HF CableHFSS-Thermal
HFSSCoax cable (50 Ohm impedance);1 GHz; 100 Watts;
Copper modeled with a surfaceimpedance boundary condition;
Convection- radiationthermal boundary condition
ePhysicsLosses in copper are
applied as thermal sourcesat the surface of the
conductors.
Losses in dielectrics areapplied as volumetrically
distributed thermal sources.
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HF CableHFSS-Thermal
Temperature distribution
Heat flow
Average temperature
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Summary
w Powerful EM-Coupled Analysis
w Limits Need to Export Models
w Saves Time