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Book Description

Electrical Machine Design caters to the requirements of undergraduate and postgraduate students of electrical engineering and industry novices. The authors have adopted a flow chart based approach to explain the subject. This enables an in-depth understanding of the design of different types of electrical machines with an appropriate introduction to basic design considerations and the magnetic circuits involved. The book aids students to prepare for various competitive exams through objective questions, worked-out examples and review questions in increasing order of difficulty. MATLAB and C programs and Finite Element simulations using Motor Solve, featured in the text offers a profound new perspective in understanding of automated design of electrical machines.

Table of Contents

  1. Cover
  2. About Pearson
  3. Title Page
  4. Contents
  5. Foreword
  6. Preface
  7. About the Authors
  8. 1. Basic Design Considerations of Electrical Machines
    1. 1.1 Principles of Design
    2. 1.2 Factors for Consideration
    3. 1.3 Classification of Design Problem
      1. 1.3.1 Need for Computer-aided Design
    4. 1.4 Specifications and Standards
    5. 1.5 Constraints of Design
    6. 1.6 Dimensions and Rating of Machines
    7. 1.7 Output Equation
      1. 1.7.1 DC Machine
      2. 1.7.2 AC Machine
    8. 1.8 Materials for Electrical Machines
      1. 1.8.1 Conducting Materials
      2. 1.8.2 Resistive Materials
      3. 1.8.3 Magnetic Materials
      4. 1.8.4 Insulation Materials
    9. 1.9 Heat Dissipation Modes
    10. 1.10 Types of Cooling (Ventilation)
      1. 1.10.1 Cooling of Turbo Alternators
    11. 1.11 Types of Enclosure
    12. 1.12 Quantity of Coolant
    13. 1.13 Types of Duties and Ratings
    14. 1.14 Determination of Temperature Rise and Fall
    15. Review Questions
    16. Multiple-choice Questions
    17. Short Type Questions
    18. Long Type Questions
    19. Problems
  9. 2. Design of Magnetic Circuits
    1. 2.1 Introduction
      1. 2.1.1 Analysis of Series Composite Magnetic Circuit
      2. 2.1.2 Analysis of Parallel Composite Magnetic Circuits
      3. 2.1.3 Comparison Between Magnetic Circuit and Electric Circuit
    2. 2.2 Determination of Reluctance and MMF of Air Gap
      1. 2.2.1 Contraction of Air Gap Area Per Pole (Effective Air Gap Area)
      2. 2.2.2 Effect of Pole Saliency
    3. 2.3 Determination of MMF of Teeth
    4. 2.4 Real Flux Density and Apparent Flux Density
    5. 2.5 Iron Loss Calculation
      1. 2.5.1 Hysteresis Loss
      2. 2.5.2 Eddy Current Loss
      3. 2.5.3 Total Iron or Core Loss
      4. 2.5.4 Pulsation Loss
    6. 2.6 Magnetic Leakage
    7. 2.7 Estimation of Specific Permeance and Leakage Reactance
      1. 2.7.1 Parallel-sided Slot
      2. 2.7.2 Parallel-sided Slot with Double Layer Windings
      3. 2.7.3 Tapered Slot
      4. 2.7.4 Circular Slot
      5. 2.7.5 T Bar Slot (Induction Motor)
    8. 2.8 Magnetic Pull
      1. 2.8.1 Radial Magnetic Forces
      2. 2.8.2 Radial Magnetic Forces and Unbalanced Magnetic Pull
      3. 2.8.3 Determination of Unbalanced Magnetic Pull
      4. 2.8.4 Significance and Minimization of Unbalanced Magnetic Pull
    9. Review Questions
    10. Multiple-choice Questions
    11. Short Type Questions
    12. Long Type Questions
    13. Problems
  10. 3. Design of Transformer
    1. 3.1 Introduction
      1. 3.1.1 Based on Voltage Ratio
      2. 3.1.2 Based on Construction
      3. 3.1.3 Based on Application
      4. 3.1.4 Based on Number of Phases
    2. 3.2 Specifications of a Transformer
    3. 3.3 Design of Transformer
      1. 3.3.1 Output Equation of Single-phase Transformer
      2. 3.3.2 Output Equation of Single-phase Transformer (Core-type)
      3. 3.3.3 Output Equation of Single-phase Transformer (Shell-type)
      4. 3.3.4 Output Equation of Three-phase Transformer
      5. 3.3.5 Output Equation of Three-phase Transformer (Core-type)
      6. 3.3.6 Output Equation of Three-phase Transformer (Shell-type)
    4. 3.4 Volt Per Turn of Winding
    5. 3.5 Choice of Flux Density
    6. 3.6 Choice of Current Density
    7. 3.7 Design of Core
      1. 3.7.1 Square Core
      2. 3.7.2 Stepped Core
    8. 3.8 Design of Yoke
    9. 3.9 Window and Core Proportions
    10. 3.10 Overall Dimensions
      1. 3.10.1 Single-phase Core-type Transformer
      2. 3.10.2 Three-phase Core-type Transformer
      3. 3.10.3 Single-phase Shell-type Transformer
      4. 3.10.4 Three-phase Shell-type Transformer
    11. 3.11 Design of Windings
      1. 3.11.1 Type and Choice of Windings
    12. 3.12 Resistance Calculation
    13. 3.13 Reactance Calculation
      1. 3.13.1 Leakage Reactance of a Core-type Transformer with Concentric LV and HV Coils of Equal Height or Length
    14. 3.14 Flowchart for Overall Design of Transformer
    15. 3.15 No Load Current of a Transformer
      1. 3.15.1 Single-phase Transformer
      2. 3.15.2 Three-phase Transformer
      3. 3.15.3 Magnetizing Volt – Ampere and Alternate Expression for ­Magnetizing Current
    16. 3.16 Transformer Losses
    17. 3.17 Effects of Change in Frequency in Parameters of the Transformer
    18. 3.18 Optimum Design
    19. 3.19 Cooling of Transformer
    20. 3.20 Temperature Rise and Design of Cooling System
    21. 3.21 Temperature Rise in Plain-walled Tank
    22. 3.22 Temperature Rise in Tank with Tubes
    23. 3.23 Design of Tank with Tubes
      1. 3.23.1 Flow Chart for Design of Cooling System
    24. 3.24 Mechanical Forces
    25. 3.25 Computer-aided Design of Transformer
    26. Review Questions
    27. Multiple-choice Questions
    28. Short Type Questions
    29. Long Type Questions
    30. Problems
  11. 4. Design of Three-phase Induction Motor
    1. 4.1 Introduction
    2. 4.2 Construction
    3. 4.3 Specifications
    4. 4.4 Output Equation of 3ϕ Induction Motor
    5. 4.5 Choice of Specific Loadings
      1. 4.5.1 Choice of Specific Magnetic Loading,‘Bav’
      2. 4.5.2 Choice of Specific Electric Loading, ‘ac’
    6. 4.6 Calculation of Main Dimensions (Separation of D and L)
    7. 4.7 Design of Stator of Three-phase Induction Motor
    8. 4.8 Calculation of Length of Air Gap
    9. 4.9 Design of Rotor of 3ϕ Induction Motor
      1. 4.9.1 Design of Squirrel Cage Rotor
      2. 4.9.2 Design of Wound or Slip-ring Rotor
    10. 4.10 Estimation of Operating Characteristics
      1. 4.10.1 Core Loss Component
      2. 4.10.2 Magnetizing Component
    11. 4.11 Harmonic Torques
      1. 4.11.1 Loss Component
    12. 4.12 Short Circuit Current
      1. 4.12.1 Stator Resistance
      2. 4.12.2 Rotor Resistance
    13. 4.13 Circle Diagram
    14. 4.14 Dispersion Coefficient
    15. 4.15 Computer-aided Design of Three-phase Induction Motor
    16. Review Questions
    17. Multiple-choice Questions
    18. Short Type Questions
    19. Long Type Questions
    20. Problems
  12. 5. Design of Single-phase Induction Motor
    1. 5.1 Introduction
    2. 5.2 Construction
      1. 5.2.1 Split Phase Motors
      2. 5.2.2 Shaded Pole Motors
      3. 5.2.3 Repulsion Motors
    3. 5.3 Design Considerations
    4. 5.4 Specifications
    5. 5.5 Constructional Features
    6. 5.6 Design of Single-phase Induction Motor
      1. 5.6.1 Output Equation
      2. 5.6.2 Choice of Specific Loadings
      3. 5.6.3 Separation of D and L
      4. 5.6.4 Design of Stator
      5. 5.6.5 Design of Rotor
      6. 5.6.6 Magnetic Circuit Calculations
      7. 5.6.7 Calculation of Resistance and Leakage Reactance
    7. 5.7 Performance Calculation
      1. 5.7.1 Equivalent Circuit Method
      2. 5.7.2 Analytical Method (Veinott’s Method)
    8. Review Questions
    9. Short Type Questions
    10. Long Type Questions
  13. 6. Design of Synchronous Machine
    1. 6.1 Introduction
    2. 6.2 Types of Synchronous Machine
      1. 6.2.1 Types of Synchronous Generators
      2. 6.3 Constructional Aspects of Synchronous Machines
    3. 6.4 Construction of Hydro Generators
    4. 6.5 Construction of Turbo Generator
    5. 6.6 Synchronous Motor
    6. 6.7 Specifications
    7. 6.8 Output Equation
    8. 6.9 Choice of Specific Loadings
      1. 6.9.1 Choice of Bav (Specific Magnetic Loading)
      2. 6.9.2 Choice of ac (Specific Electric Loading)
    9. 6.10 Design of Salient Pole Machine
      1. 6.10.1 Main Dimensions
      2. 6.10.2 Types of Poles
    10. 6.11 Design of Turbo Generator
    11. 6.12 Computer-aided Design of Three-phase Synchronous Machine
    12. Review Questions
    13. Multiple-choice Questions
    14. Short Type Questions
    15. Long Type Questions
    16. Problems
  14. 7. DC Machine
    1. 7.1 Introduction
    2. 7.2 Construction
      1. 7.2.1 Field or Excitation System
      2. 7.2.2 Rotor
      3. 7.2.3 Specifications of DC Machine
    3. 7.3 Output Equation
      1. 7.3.1 Estimation of Power, Pa
    4. 7.4 Choice of Specific Loadings of DC Machine
      1. 7.4.1 Choice of Specific Magnetic Loading (Bav)
      2. 7.4.2 Choice of Specific Electric Loading (ac)
    5. 7.5 Choice of Number of Poles
      1. 7.5.1 Guidelines for the Selection of Poles
    6. 7.6 Limitations of D and L
      1. 7.6.1 Limiting Values of Core Length (L)
      2. 7.6.2 Limiting Value of Armature Diameter (D)
    7. 7.7 Separation of D and L
    8. 7.8 Estimation of Length of Air Gap
      1. 7.8.1 Factors Affecting Air Gap Length
      2. 7.8.2 Estimation of lg
    9. 7.9 Design of Armature
    10. 7.10 Design of Commutator and Brushes
      1. 7.10.1 Brush Dimensions
      2. 7.10.2 Commutator Losses and Temperature Rise
    11. 7.11 Design of Field System of DC Machine
      1. 7.11.1 Design of Pole
      2. 7.11.2 Design of Shunt Field Winding
      3. 7.11.3 Design of Series Field Winding
    12. 7.12 Design of Interpoles
    13. 7.13 Computer-aided Design of DC Machine
    14. Review Questions
    15. Multiple-choice Questions
    16. Short Type Questions
    17. Long Type Questions
    18. Problems
  15. 8. Computer-aided Design and Analysis of Electric Motors
    1. 8.1 Introduction
    2. 8.2 Salient Pole Synchronous Motor
    3. 8.3 Induction Motor
    4. 8.4 Separately Excited DC Motor
  16. Index
  17. Copyright
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