Design of Rotating Electrical Machines / Edition 1

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In one complete volume, this essential reference presents an in-depth overview of the theoretical principles and techniques of electrical machine design. This book enables you to design rotating electrical machines with its detailed step-by-step approach to machine design and thorough treatment of all existing and emerging technologies in this field.

Senior electrical engineering students and postgraduates, as well as machine designers, will find this book invaluable. In depth, it presents the following:

  • Machine type definitions; different synchronous, asynchronous, DC, and doubly salient reluctance machines.
  • An analysis of types of construction; external pole, internal pole, and radial flux machines.
  • The properties of rotating electrical machines, including the insulation and heat removal options.

Responding to the need for an up-to-date reference on electrical machine design, this book includes exercises with methods for tackling, and solutions to, real design problems. A supplementary website hosts two machine design examples created with MATHCAD: rotor surface magnet permanent magnet machine and squirrel cage induction machine calculations. Classroom tested material and numerous graphs are features that further make this book an excellent manual and reference to the topic.

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Product Details

  • ISBN-13: 9780470695166
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 2/17/2009
  • Edition description: New Edition
  • Edition number: 1
  • Pages: 538
  • Product dimensions: 6.70 (w) x 9.90 (h) x 1.40 (d)

Meet the Author

Juha Pyrhönen is a Professor in the Department of Electrical Engineering at Lappeenranta University of Technology, Finland. He is engaged in the research and development of electric motors and drives. He is especially active in the fields of permanent magnet synchronous machines and drives and solid-rotor high-speed induction machines and drives. He has worked on many research and industrial development projects and has produced numerous publications and patents in the field of electrical engineering.

Tapani Jokinen is a Professor Emeritus in the Department of Electrical Engineering at Helsinki University of Technology, Finland. His principal research interests are in AC machines, creative problem solving and product development processes. He has worked as an electrical machine design engineer with Oy Strömberg Ab Works. He has been a consultant for several companies, a member of the Board of High Speed Tech Ltd and Neorem Magnets Oy, and a member of the Supreme Administrative Court in cases on patents. His research projects include, among others, the development of superconducting and large permanent magnet motors for ship propulsion, the development of high-speed electric motors and active magnetic bearings, and the development of finite element analysis tools for solving electrical machine problems.

Valeria Hrabovcova is a Professor of Electrical Machines in the Department of Power Electrical Systems, Faculty of Electrical Engineering, at the University of ˇ Zilina, Slovak Republic. Her professional and research interests cover all kinds of electrical machines, electronically commutated electrical machines included. She has worked on many research and development projects and has written numerous scientific publications in the field of electrical engineering. Her work also includes various pedagogical activities, and she has participated in many international educational projects.

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Table of Contents

About the Authors.


Abbreviations and Symbols.

1 Principal Laws and Methods in Electrical Machine Design.

1.1 Electromagnetic Principles.

1.2 Numerical Solution.

1.3 The Most Common Principles Applied to Analytic Calculation.

1.4 Application of the Principle of Virtual Work in the Determination of Force and Torque.

1.5 Maxwell’s Stress Tensor; Radial and Tangential Stress.

1.6 Self-Inductance and Mutual Inductance.

1.7 Per Unit Values.

1.8 Phasor Diagrams.


2 Windings of Electrical Machines.

2.1 Basic Principles.

2.2 Phase Windings.

2.3 Three-Phase Integral Slot Stator Winding.

2.4 Voltage Phasor Diagram and Winding Factor.

2.5 Winding Analysis.

2.6 Short Pitching.

2.7 Current Linkage of a Slot Winding.

2.8 Poly-Phase Fractional Slot Windings.

2.9 Phase Systems and Zones of Windings.

2.10 Symmetry Conditions.

2.11 Base Windings.

2.12 Fractional Slot Windings.

2.13 Single- and Two-Phase Windings.

2.14 Windings Permitting a Varying Number of Poles.

2.15 Commutator Windings.

2.16 Compensating Windings and Commutating Poles.

2.17 Rotor Windings of Asynchronous Machines.

2.18 Damper Windings.


3 Design of Magnetic Circuits.

3.1 Air Gap and its Magnetic Voltage.

3.2 Equivalent Core Length.

3.3 Magnetic Voltage of a Tooth and a Salient Pole.

3.4 Magnetic Voltage of Stator and Rotor Yokes.

3.5 No-Load Curve, Equivalent Air Gap and Magnetizing Current of the Machine.

3.6 Magnetic Materials of a Rotating Machine.

3.7 Permanent Magnets in Rotating Machines.

3.8 Assembly of Iron Stacks.

3.9 Magnetizing Inductance.


4 Flux Leakage.

4.1 Division of Leakage Flux Components.

4.2 Calculation of Flux Leakage.


5 Resistances.

5.1 DC Resistance.

5.2 Influence of Skin Effect on Resistance.

6 Main Dimensions of a Rotating Machine.

6.1 Mechanical Loadability.

6.2 Electrical Loadability.

6.3 Magnetic Loadability.

6.4 Air Gap.


7 Design Process and Properties of Rotating Electrical Machines.

7.1 Asynchronous Motor.

7.2 Synchronous Machine.

7.3 DC Machines.

7.4 Doubly Salient Reluctance Machine.


8 Insulation of Electrical Machines.

8.1 Insulation of Rotating Electrical Machines.

8.2 Impregnation Varnishes and Resins.

8.3 Dimensioning of an Insulation.

8.4 Electrical Reactions Ageing Insulation.

8.5 Practical Insulation Constructions.

8.6 Condition Monitoring of Insulation.

8.7 Insulation in Frequency Converter Drives.


9 Heat Transfer.

9.1 Losses.

9.2 Heat Removal.

9.3 Thermal Equivalent Circuit.


Appendix A.

Appendix B.


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