Solenoid Actuators: Theory and Computational Methods E-Book

Daniele Righetti

• Herausgeber: Youcanprint
• Kategorie: Wissenschaft und neue Technologien
• Sprache: Englisch
• Veröffentlichungsjahr: 2017

Beschreibung

The text collects calculation tools for sizing and analyzing the performance of direct current solenoid devices, such as linear actuators and valves. From the point of view of calculation, all aspects are addressed, from electromagnetic to thermal and mechanical.

Leseprobe

Contents

Introduction

Chapter 1

Sizing of the solenoid

1.1.Magnetic circuit theory

1.2.Sizing of a solenoid

1.3.Sensitivity analysis

1.4.Maxwell Stress Tensor

Chapter 2

Coils Windings

2.1.Magnet wire

2.2.Winding procedure

2.3.Winding efficiency

2.4.Computation of winding size

2.5.Number of coils Vs. Wire diameter

2.6.Reel deformation during winding

2.7.Observations on resistance-temperature dependency

Chapter 3

Materials and saturation

3.1.Magnetic saturation

3.2.Magnetization curves modelling

3.3.Magnetic materials

3.4.Physical aspects of magnetic materials

3.5.Amagnetic materials

Chapter 4

Complete Calculation

4.1.Saturation computation

4.2.Fringing effect

4.3.Inductance Calculation

4.4.Leakage flux computation

4.5.Dropout Voltage

4.6.Notes on tolerances and plating effects

Chapter 5

Finite Element Method

5.1.FEM introduction

5.2.Physical background

5.3.FEM Formulation

Chapter 6

Thermal analysis

6.1.Introduction

6.2.Stationary thermal model

6.3.Transitory model

6.4.Cooling of the coil

6.5.Thermal properties of materials

6.6.Computation of total equivalent specific heat

6.7.Heat exchange coefficient K

Chapter 7

Advanced Calculations

7.1.Electro-mechanical model

First equation: electrical description

Frequency Response

Second equation: mechanical description

Solenoid system and solving

Frequency response of the electro-mechanical model

7.2.Electromagnetic compatibility

Magnetic Fields induced into equipment

Electric Fields induced into equipment

Magnetic Fields induced into interconnecting cables

Electric Fields induced into interconnecting cables

Spike induced into interconnecting cables

7.3.Fly-back diode

Appendix A

Sensitivity analysis

Appendix B

DC-AC rectifier

Bibliography

Index

SOLENOID ACTUATORS

Title | Solenoid Actuators: Theory and Computational MethodsAuthor | Daniele Righetti

ISBN | 9788892672802

Cover image by the Author

© All rights reserved by the AuthorNo part of this book may be reproduced without the prior permission of the Author.

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About the author

Daniele Righetti was born in Perugia, Italy, in 24th July 1985. He graduated in 2010 in Aeronautical Engineering at University of Rome “Sapienza”. He works in aerospace industry as designer of electromechanical and hydraulic systems. He focused his work on solenoid valves and actuators. This book derives from this experience and collects all studied and ideas developed by the author.

To my mother and my father

Introduction

The aim of this book is to give the reader all the computational tools useful to size and design solenoid actuators. This book discusses only direct current solenoid actuators (Appendix B discusses rectifier principles), that means solenoid valves and many types of actuators used in many different industrial fields, such as automatization, automotive, aerospace, etc.

There are many technical publications that discuss about electromagnetic devices or solenoid actuators and valves, but none of them is able to give formulas and tools in order to analyse solenoid performances or to size the solenoid itself. All of these books give the reader a general view of which are the topics concerning solenoid actuators. Some of them discusses more in general electromagnetic linear motion devices, which means also motorized actuators.

Therefore, it was necessary a detailed discussion about this topic. All the content of this book has been studied and developed by the author in his experience as designer of solenoid actuators and valves in aerospace industry. The computational techniques herein discussed have been developed by the author himself. Those techniques has given the author the possibility to successfully design and size solenoid devices.

The book is organized in the following chapters:

1.Sizing of the solenoid

2.Coils Winding

3.Materials and saturation

4.Complete calculation

5.Finite element method

6.Thermal analysis of the solenoid

7.Advanced calculations

In the appendixes:

•Appendix A: sensitivity analysis

•Appendix B: rectifier principles

The author hopes you enjoy the reading of the book.

Perugia (Italy), 9th April 2017

Daniele Righetti

Chapter 1

Sizing of the solenoid