Electrical Machines
machines powerBrushless Permanent-Magnet Motor Design
Author: Duane C. Hanselman
Version: 2nd edition
size: 70.3 MB
download link: http://sh.st/mkN73
Overview
Written for electrical, electronics, and mechanical engineers responsible for designing and specifying motors, the book provides details of brushless DC and synchronous motors, as well as both radial and axial motor topologies. Beginning with a discussion of the fundamentals of generic motor design, it logically progresses to a set of more advanced, yet easily understandable, concepts for designing brushless permanent-magnet motors. In addition, the author fully explains techniques for magnetic modeling and circuit analysis, shows how magnetic circuit analysis applies to motor design, describes all major aspects of motor operation and design in simple mathematical terms, develops rigourous design equations for radial flux and axial flux motors, and illustrates basic motor drive schemes. All common motor design terms are clearly defined and a wealth of charts, tables and equations are included.
Table of Contents
Chapter 1 Basic Concepts
1.1 Scope
1.2 Shape
1.3 Torque
1.4 Motor Action
1.5 Magnet Poles and Motor Phases
1.6 Poles, Slots, Teeth, and Yokes
1.7 Mechanical and Electrical Measures
1.8 Motor Size
1.9 Units
1.10 Summary
Chapter 2 Magnetic Modeling
2.1 Magnetic Circuit Concepts
Basic Relationships
Magnetic Field Sources
Air Gap Modeling
Slot Modeling
Example
2.2 Magnetic Materials
Permeability
Ferromagnetic Materials
Core Loss
Permanent Magnets
Permanent Magnet Magnetic Circuit Model
2.3 Example
2.4 Summary
Chapter 3 Electrical and Mechanical Relationships
3.1 Flux Linkage and Inductance
Self inductance
Mutual Inductance
Mutual Flux Due to a Permanent Magnet
3.2 Induced voltage
Faraday's Law
Example
3.3 Energy and Coenergy
Energy and Coenergy in Singly-Excited Systems
Energy and Coenergy in Doubly-Excited Systems
Coenergy in the Presence of a Permanent Magnet
3.4 Force, Torque and Power
Basic Relationships
Fundamental Implications
Torque From a Macroscopic Viewpoint
Force From a Microscopic Viewpoint
Reluctance and Mutual Torque
Example
3.5 Summary
Chapter 4 Brushless Motor Fundamentals
4.1 Assumptions
Rotational Motion
Surface-Mounted Magnets
4.2 Fundamental Concepts
Magnetic Circuit Model
Magnetic Circuit Solution
Flux Linkage
Back EMF and Torque
Multiple Coils
4.3 Multiple Phases
4.4 Design Variations
Fractional Pitch Coils
Fractional Pitch Magnets
Fractional Slot Motor
4.5 Coil Resistance
4.6 Coil Inductance
Air Gap Inductance
Slot Leakage Inductance
End Turn Inductance
4.7 Series and Parallel Connections
4.8 Armature Reaction
4.9 Slot Constraints
Slot Fill Factors
Slot Resistance
Wire Gage Relationships
Constancy of Ni
4.10 Torque Constant, Back EMF Constant, and Motor Constant
4.11 Torque per Unit Rotor Volume
4.12 Cogging Torque
4.13 Summary
Chapter 5 Motor Design Possibilities
5.1 Radial Flux Motors
Inner Rotor
Outer Rotor
5.2 Axial Flux Motors
5.3 Li near Mo tor s
5.4 Summary
Chapter 6 Windings
6.1 Assumptions
6.2 Coil Span
6.3 Valid Pole and Slot Combinations
6.4 Winding Layout
Example
Example
Winding Layout Procedure
6.5 Coil Connections
6.6 Winding Factor
6.7 Inductance Revisited
Single Tooth Coil Equivalence
Air Gap Inductance
Slot Leakage Inductance
6.8 Summary
Chapter 7 Magnetic Design
7.1 Air Gap Magnetic Field Distribution
Air Gap Region Solution
Magnet Region Solution
Symmetry
7.2 Influence of Stator Slots
7.3 Tooth Flux
7.4 Stator Yoke Flux
7.5 Influence of Skew
7.6 Influence of Ferromagnetic Material
7.7 Back EMF
7.8 Slotless Motor Construction
Concentrated Winding
Sinusoidally-Distributed Winding
7.9 Summary
Chapter 8 Electrical Control
8.1 Fundamentals of Torque Production
8.2 Brushless DC Motor Drive
Ideal Torque Production
Motor Constant
Torque Ripple
8.3 AC Synchronous Motor Drive
Ideal Torque Production
Motor Constant
Torque Ripple
8.4 General Drive
Ideal Torque Production
Torque Ripple
Motor Constant
8.5 Motor Drive Topologies
Half Bridge
Full H-Bridge
Y-Connection
zl-Connection
8.6 Summary
Chapter 9 Performance
9.1 Motor Constant
General Sizing
Motor Constant Maximization
9.2 Cogging Torque Relationships
9.3 Radial Force Relationships
9.4 Core Losses
Basic Concepts
Core Loss Modeling
Application to Motor Design
Conclusion
9.5 AC Winding Resistance
9.6 Summary
Chapter 10 Examples
Common Characteristics
Presented Results
Notes
Two Pole Motors
Four Pole Motors
Six Pole Motors
Eight Pole Motors
Ten Pole Motors
Twelve Pole Motors
Fourteen Pole Motors
Sixteen Pole Motors
Twenty Pole Motors
Twenty-Four Pole Motors
Thirty-Two Pole Motors
Appendix A Fourier Series
A.l Definition
A.2 Coefficients
A.3 Symmetry Properties
A.4 Mathematical Operations
Addition
Scalar Multiplication
Function Product
Phase Shift
Differentiation
Mean Square Value and RMS
A.5 Computing Coefficients
Procedure
A.6 Summary
Appendix B Magnetic Field Distributions in Polar Coordinates
B.l Problem Formulation
B.2 Polar Coordinate Application
B.3 Air Gap Region Solution
B.4 Magnet Region Solution
B.5 Summary
B.6 Magnetization Profiles
Radial Magnetization
Parallel Magnetization
Radial Sinusoidal Amplitude Magnetization
Sinusoidal Angle Magnetization
B.7 Examples
B.8 Summary
Appendix C Magnetic Field Distributions in Rectangular Coordinates
C.l Rectangular Coordinate Application
Single Magnet and Single Air Gap Case
Two Magnet, Single Air Gap Case
One Magnet, Two Air Gap Case
C.2 Magnetization Profile
C.3 Summary
Appendix D Symbols, Units, and Abbreviations
Appendix E Glossary
Bibliography
Books
Articles
Index
