ANSYS软件用于铁氧体磁芯平面变压器设计案例

ansys软件的应用

Coupled Electromagnetic and Thermal Analysis of Ferrite Core Electronic Planar Transformer

Mark Christini ANSYS, Inc1© 2011 ANSYS, Inc. November 16, 2011

ansys软件的应用

Outline Introduction Maxwell 3D Eddy Current and Electrostatic Simulation ANSYS Mechanical Thermal Simulation 2-way Thermal Coupling back to Maxwell Simplorer System Simulation using Maxwell State Space Dynamic model Summary© 2011 ANSYS, Inc. November 16, 2011

ansys软件的应用

Introduction Coupled electromagnetic-thermal analysis of a ferrite core electronic planar transformer Magnetic simulation done at fundamental frequency= 100kHz with harmonics up to 5MHz All sources of losses considered including: eddy current, skin, and proximity losses in the windings as well as eddy current and hysteresis losses in the ferrite core Losses are directly coupled into an ANSYS Mechanical Thermal simulation in order to determine temperature rise using element by element coupling Temperatures fed back to Maxwell for material changes System simulation done inside of Simplorer using dynamic state space frequency dependent model© 2011 ANSYS, Inc. November 16, 2011

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ansys软件的应用

Coupled Electromechanical Design FlowParasitics

Q3D

System DesignIAA

Simplorer

Motor DesignPMSYNC IBA ICA:

RMxprt

TorqueAD2D

J

ICA

PP:= 6

GAIN

ANSYS CFD FluidFlow Magnetics

PExprt

Thermal/Stress

ANSYS Mechanical

Electromagnetic ComponentsModel order Reduction Co-simulation Field Solution Model Generation

Maxwell 2D/3D

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

FEA Adaptive Meshing2D Transformer Model 3D Transformer Model

2D Transformer Mesh

3D Transformer MeshIn 3D, finite elements are tetrahedra

In 2D, finite elements are triangles

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

Transformer Design Challenges Magnetic effects:––––––– nonlinear materials frequency dependent materials temp dependent materials eddy currents proximity effects time diffusion of magnetic fields transient excitations

Electric Field effects:– varying dielectric permitivities– varying dimensions and shape– 3D field effects

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

ANSYS Comprehensive SolutionSystem

ANSYS Mixed-Signal Multi-Domain System SimulatorCircuit

Model Order Reduction& CosimulationComponent Electrical7© 2011 ANSYS, Inc. November 16, 2011

ANSYS WorkbenchMagnetic Fluid Mechanical Thermal Acoustic

ansys软件的应用

Workbench Coupling Technology

Electromagnetic

→

Thermal

→

Stress

→ System

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

Electronic Planar Transformer Ferrite PQ Core Primary turns= 4 Secondary turns= 2 Insulation layers between conductors Fundamental Frequency= 100kHz

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

Maxwell 3D Source Setup Load case with Ipri= 50A and Isec= 80A Unbalanced A-turns for core excitation

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

Ferrite Core PropertiesFrequency dependent

permeability and imaginary permeability Use Simplorer Sheetscan utility to grab permeability data points

Datasheet11© 2011 ANSYS, Inc. November 16, 2011

Sheetscan

ansys软件的应用

Required inputs for Maxwell are real permeability and loss tangent Loss tangent based on series equivalent model Temp= 0° Cfrequency 100000 200000 300000 400000 500000 600000 700000 800000 900000 1000000 1500000 2000000 3000000 4000000 5000000 6000000 7000000 8000000 9000000 1000000012© 2011 ANSYS, Inc.

Frequency Dependent Core Properties in Maxwell

"µs Rδs= '= sµsωLs

perm 1939 1977 2015 2052 2090 2165 2281 2322 2446 2533 2581 2029 828 227 97 61 47 39 34 31

perm_imag loss tangent 6 0.0032 13 0.0068 22 0.0110 35 0.0173 51 0.0244 79 0.0363 119 0.0522 174 0.0750 264 0.1078 336 0.1326 998 0.3869 2101 1.0351 2178 2.6306 1626 7.1618 1093 11.2199 663 10.8398 424 8.9644 327 8.3658 271 7.9437 228 7.4132November 16, 2011

ansys软件的应用

Core Material Properties - InputsDatasets used to define properties vs. frequency: Relative Permeability= pwl($perm,Freq) Magnetic Loss tangent= pwl($losstan,Freq)

Relative permitivity= 12 Conductivity= 0.5 (S/m)

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© 2011 ANSYS, Inc.

November 16, 2011

ansys软件的应用

Core Material Properties - OutputsUse“named expression” in calculator to verify the real and imaginary permeability Use report to plotµ’ and loss tangent vs. frequencyReal permeability -µ’

Num> Vector> 1,0,0 Material> perm> multiply complex> real> mag constant> mu0> divideReal permeability -µ”3000.00Curve Info mu_real_eval Setup1: LastAdaptive Phase='0deg'

Permeability and Loss Tangent

Maxwell3Ddesign2

ANSOFT

12.00

2500.00

loss_tangent Setup1: LastAdaptive Phase='0deg'

10.00

2000.00

8.00

mu_real_eval

Num> Vector> 1,0,0 Material> perm> multiply complex> imag> mag constant> mu0> divideLoss tangent

1500.00

6.00

1000.00

4.00

500.00

2.00

0.00 0.00 1.00 2.00 Freq[MHz] 3.00 4.00 5.00

0.00

δ=µ”/µ’14© 2011 ANSYS, Inc. November 16, 2011

loss_tangent

ansys软件的应用

Temperature Settings in Maxwell Initial temperature= 22°C Core and windings have temp dependent mat …… 此处隐藏：4100字，全部文档内容请下载后查看。喜欢就下载吧 ……