By Topic

Power Magnetic Devices:A Multi-Objective Design Approach

Cover Image Copyright Year: 2014
Author(s): Scott D. Sudhoff
Publisher: Wiley-IEEE Press
Content Type : Books & eBooks
Topics: Components, Circuits, Devices & Systems ;  Power, Energy, & Industry Applications
  • Print

Abstract

Presents a multi-objective design approach to the many power magnetic devices in use todayPower Magnetic Devices: A Multi-Objective Design Approach addresses the design of power magnetic devices—including inductors, transformers, electromagnets, and rotating electric machinery—using a structured design approach based on formal single- and multi-objective optimization.The book opens with a discussion of evolutionary-computing-based optimization. Magnetic analysis techniques useful to the design of all the devices considered in the book are then set forth. This material is then used for inductor design so readers can start the design process. Core loss is next considered; this material is used to support transformer design. A chapter on force and torque production feeds into a chapter on electromagnet design. This is followed by chapters on rotating machinery and the design of a permanent magnet AC machine. Finally, enhancements to the design process including thermal analysis and AC conductor losses due to skin and proximity effects are set forth.Power Magnetic Devices:
Focuses on the design process as it relates to power magnetic devices such as inductors, transformers, electromagnets, and rotating machinery
Offers a structured design approach based on single- and multi-objective optimization
Helps experienced designers take advantage of new techniques which can yield superior designs with less engineering time
Provides numerous case studies throughout the book to facilitate readers’ comprehension of the analysis and design process
includes Powerpoint-slide-based student and instructor lecture notes and MATLAB-based examples, toolboxes, and design codesDesigned to support the educational needs of students, Power Magnetic Devices: A Mu lti-Objective Design Approach also serves as a valuable reference tool for practicing engineers and designers.

  •   Click to expandTable of Contents

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Front Matter

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      The prelims comprise:
      Half-Title Page
      Title Page
      Copyright Page
      Deditation Page
      Contents
      Preface View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Optimization-Based Design

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter focuses on the power magnetic device design. It begins with a general consideration of the design process. The manual design process involves an engineer in the iteration process. The chapter illustrates an alternate design process, and discusses some properties of objective functions that are relevant to algorithm optimization. The chapter explains single-objective optimization, with particular emphasis on optimization using genetic algorithms. This is followed by a discussion on multiobjective optimization. Practical aspects of formulating design problems as optimization problems are then discussed. The chapter concentrates on posing the design problem as a formal optimization problem; once the problem is so posed, any optimization algorithm can be used. A discussion on genetic algorithms is included in order to provide at least one method that can be used for the optimization process. The chapter also talks about the canonical genetic algorithm. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Magnetics and Magnetic Equivalent Circuits

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter sets forth the background needed to analyze electromagnetic and electromechanical systems. It includes a review of magnetics, particularly magnetostatics. The notion of magnetic equivalent circuits is explored as a fairly accurate technique for the analysis of magnetic systems. The chapter talks about (a) Ampere's law, and the relationship between magnetomotive force (MMF) sources and MMF drops in the form of Kirchhoff's MMF law, (b) the relationship between fluxes going into a common volume or node that is governed by Kirchhoff's flux law, and (c) Ohm's law for magnetic equivalent circuits. A section describes the relationship between the magnetic equivalent circuit and the corresponding electric equivalent circuit, and highlights the concepts of flux linkage and inductance. It explains leakage permeance so as to create a more accurate magnetic model, and the flux path. The final section of the chapter discusses finite element analysis (FEA), another technique for magnetic analysis. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Introduction To Inductor Design

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter provides a first example of electromagnetic component design using a multi-objective approach. First, it briefly overviews common inductor architectures; some of the architecture types illustrated in the chapter are UI-core, EI-core, solenoid, and bobbin core. Next, the calculation of DC coil resistance is explained. Here, a general approach to finding the DC resistance of a generic coil of wire is discussed. This approach is then applied to some specific configurations. The formulation of a DC inductor design problem as an optimization problem is then set forth. The problem of designing an inductor for an application in which we desire to have a required incremental inductance at a given DC bias current is discussed; the objective is to minimize mass and loss. Finally, a case study of a UI-core inductor design is presented. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Force and Torque

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      In this chapter, an energy-based approach to the calculation of force and torque is set forth. Two variations of the approach are considered. In the first variation a macroscopic view of the device is taken. The second variation of the approach views the device microscopically. The chapter focuses on the evaluation of an expression for the energy in the coupling field. Once an expression for field energy has been derived an expression for force is readily obtained. The chapter considers the more common case where flux linkage is expressed as a function of current and position. It also shows that the co-energy provides a useful vehicle in the calculation of force. The chapter also considers a microscopic device view in which the flux linkage equations need not be explicitly formulated. This approach facilitates the calculation of force or torque when using magnetic equivalent circuit analysis. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Introduction to Electromagnet Design

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter discusses the design of perhaps the simplest electromechanical device¿¿-¿¿an electromagnet. First, common electromagnet configurations are briefly reviewed. Next, the chapter describes the design of an EI-core electromagnet. The analysis is broken into three parts: (i) electric analysis that can be used to predict the current; (ii) magnetic analysis that can be used to determine the system fluxes and MMF drops; and (iii) force analysis that can be used to predict the force between the E-core and the I-core. The EI-core arrangement is selected because it can be readily built and the magnetic model can be used to study the EI core inductor in addition to the electromagnet. This is followed by the formulation of the EI-core electromagnet design problem as an optimization problem. Finally, a case study in electromagnet design is set forth. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Magnetic Core Loss

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter focuses on calculating the losses within a magnetic material. These losses arise from several causes. Eddy currents induced by the time rate of change of flux in the material are one source of loss. A second source of loss is magnetic hysteresis, which is associated with the non-uniquely valued relationship between flux density and field intensity. The chapter considers a variety of empirical or behavioral approaches to modeling core loss. These are based on representing observed behavior in a mathematical form using curve fitting. The chapter also considers some other approaches to the modeling of hysteresis behavior. These include Jiles-Atherton model and the Preisach model. These are time domain models that predict the specific B-H trajectory. They offer significantly more information than the empirical models. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Transformer Design

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter discusses the design of single-phase power transformers by establishing a procedure for designing a transformer. Next, it reviews the classic transformer T-equivalent circuit and explains its use in steady-state phasor analysis. Then, the chapter talks about transformer performance considerations such as the calculation of transformer parameters, regulation, magnetizing current, operating point analysis, and inrush current, all in general terms. Next, it focuses on one specific class of transformer, the core-type transformer, develops an MEC, discusses core loss, and ultimately formulates a design approach. A section talks about a case study in the design of a single-phase core-type transformer. The chapter concludes with comments on additional factors relevant to the design process. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Distributed Windings and Rotating Electric Machinery

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter focuses on a complicated winding arrangement known as a distributed winding, which is often used in rotating electric machinery. In these machines, the goal is to establish a continuously rotating set of north and south poles on the stator, which interact with an equal number of north and south poles on the rotor, to produce uniform torque. The winding function has three important uses. First, it is useful in determining the MMF caused by distributed windings. Second, it is used to determine how much flux links a winding. Third, the winding function is instrumental in calculating winding inductances. The chapter talks about the air-gap magnetomotive force (MMF). It explains the calculation of inductances of distributed windings. The problem of the computation of leakage inductance of a stator winding and the problem of finding the resistance of a distributed winding are considered. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Introduction to Permanent Magnet AC Machine Design

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter talks about the design of a permanent magnet AC (PMAC) machine. The machine design problem is posed as a formal mathematical optimization problem. An important of operating characteristic of PMAC machines is the inverter, which is discussed at a level sufficient for design purposes. The PMAC machine geometry is explained and includes a cross-section diagram of the machine. A section talks about stator winding, followed by another one on material parameters including material selection. The chapter illustrates the calculation of stator currents. Taking the rotor position to be fixed, the chapter demonstrates how to perform a radial field analysis of the machine. A procedure is illustrated to calculate the parameters of the lumped parameter model of the machine. Ferromagnetic field analysis involves the determination of the flux density waveforms in the ferromagnetic portions of the machine. Finally, a case study on machine design is presented. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Introduction to Thermal Equivalent Circuits

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      Like magnetic analysis, there are many approaches to performing thermal analysis, including Thermal Equivalent Circuits (TECs) which are very similar to MECs. This chapter focuses on TECs. The authors use the heat equation to derive a TEC of a region with one-dimensional heat flow. This circuit is exact in the steady state and is capable of predicting transient behavior, albeit only approximately. The chapter develops a TEC for a cuboidal region. It explains the TEC of a cylindrical region. Heat flow in the axial direction is considered, followed by a discussion on heat flow in the radial direction. The chapter further considers the interconnection of TECs of individual regions of a device in order to form and solve a TEC for an entire device. The chapter concludes with a case study on a thermal model of an electromagnet. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      AC Conductor Losses

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      This chapter talks about AC conductor losses. Two principal loss mechanisms are considered. The first is skin effect, which is discussed in the context of strip conductors and round conductors. Next, the chapter focuses on proximity effect. A rather unpleasant possibility is that the two loss mechanisms may interact. A section demonstrates why the two loss mechanisms act independently. A general formulation to calculate proximity effect is given. In order to calculate the proximity effect loss, it is necessary to calculate the mean-squared field and the dynamic resistance matrix; a section shows how to find the mean-squared field and dynamic resistance matrix for a number of common geometries. The chapter concludes by considering the AC conductor losses in rotating electric machinery and in a UI-core inductor. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Conductor Data and Wire Gauges

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Selected Ferrimagnetic Core Data

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Selected Magnetic Steel Data

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Selected Permanent Magnet Data

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Phasor Analysis

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Trigonometric Identities

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      Index

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»

    • Full text access may be available. Click article title to sign in or learn about subscription options.

      IEEE Press Series on Power Engineering

      Scott D. Sudhoff
      Copyright Year: 2014

      Wiley-IEEE Press eBook Chapters

      No abstract. View full abstract»