ANSYS Low-Frequency Electromagnetic Analysis Guide.pdf

ANSYS Low-Frequency

Electromagnetic

Analysis Guide

ANSYS Release 9.0

002114

November 2004

ANSYS, Inc. is a

UL registered

ISO 9001: 2000

Company.

ANSYS Low-Frequency

Electromagnetic Analysis Guide

ANSYS Release 9.0

ANSYS, Inc.

Southpointe

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Canonsburg, PA 15317

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http://www.ansys.com

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(F) 724-514-9494

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Table of Contents

1. Overview of Magnetic Field Analysis .................................................................................................. 1–1

1.1. What Magnetic Analyses Do .......................................................................................................... 1–1

1.2. How ANSYS Handles Magnetic Analysis ......................................................................................... 1–2

1.3. Types of Static, Harmonic, and Transient Magnetic Analysis ........................................................... 1–8

1.4. Comparing Magnetic Formulations ............................................................................................... 1–8

1.4.1. 2-D Versus 3-D Magnetic Analysis ......................................................................................... 1–8

1.4.2. What Is the Magnetic Scalar Potential Formulation? .............................................................. 1–9

1.4.3. What Is the Magnetic Vector Potential Formulation? ............................................................. 1–9

1.4.4. What Is the Edge Formulation? ............................................................................................. 1–9

1.4.5. Comparing Formulations .................................................................................................... 1–10

1.4.6. Static Analysis .................................................................................................................... 1–10

1.5. Summary of Electromagnetic Elements ....................................................................................... 1–11

1.6. About GUI Paths and Command Syntax ....................................................................................... 1–13

2. 2-D Static Magnetic Analysis ............................................................................................................... 2–1

2.1. What Is Static Magnetic Analysis? .................................................................................................. 2–1

2.2. Elements Used in 2-D Static Magnetic Analysis .............................................................................. 2–1

2.3. Steps in a Static Magnetic Analysis ................................................................................................ 2–2

2.3.1. Creating the Physics Environment ........................................................................................ 2–3

2.3.1.1. Setting GUI Preferences ............................................................................................... 2–3

2.3.1.2. Defining an Analysis Title ............................................................................................. 2–3

2.3.1.3. Specifying Element Types and Options ........................................................................ 2–3

2.3.1.4. Defining the Element Coordinate System ..................................................................... 2–7

2.3.1.5. Defining Element Real Constants and a System of Units ............................................... 2–7

2.3.1.5.1. Choosing a System of Units for Your Analysis ....................................................... 2–7

2.3.1.6. Specifying Material Properties ..................................................................................... 2–8

2.3.1.6.1. Accessing Material Library Files ........................................................................... 2–8

2.3.1.6.2. Additional Guidelines for Defining Regional Material Properties and Real Con-

stants ............................................................................................................................... 2–9

2.3.1.7. For source conductor regions: .................................................................................... 2–12

2.3.1.8. For moving conductor regions: .................................................................................. 2–12

2.3.1.9. Real Constants for Moving Body Analysis ................................................................... 2–13

2.3.1.10. For Permanent Magnet Regions: .............................................................................. 2–14

2.3.1.11. For voltage-fed stranded coil regions: ...................................................................... 2–16

2.3.2. Building and Meshing the Model and Assigning Region Attributes ...................................... 2–17

2.3.3. Applying Boundary Conditions and Loads .......................................................................... 2–18

2.3.3.1. Boundary Conditions ................................................................................................. 2–19

2.3.3.1.1. Magnetic vector potentials (AZ) ........................................................................ 2–19

2.3.4. Excitation Loads ................................................................................................................. 2–19

2.3.4.1. Source Current Density (JS) ........................................................................................ 2–19

2.3.4.2. Voltage Drop (VLTG) .................................................................................................. 2–20

2.3.5. Flags .................................................................................................................................. 2–20

2.3.5.1. Force Flags ................................................................................................................ 2–20

2.3.5.2. Infinite Surface Flags (INF) .......................................................................................... 2–20

2.3.6. Other Loads ....................................................................................................................... 2–20

2.3.6.1. Current Segments (CSGX) .......................................................................................... 2–20

2.3.6.2. Maxwell Surfaces (MXWF) .......................................................................................... 2–21

2.3.6.3. Magnetic Virtual Displacements (MVDI) ...................................................................... 2–21

2.3.7. Solving the Analysis ........................................................................................................... 2–21

2.3.8. Defining the Analysis Type ................................................................................................. 2–22

2.3.9. Defining Analysis Options .................................................................................................. 2–22

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