Design of Rotating Electrical Machines (PDF)

About the Authors. Preface. 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. Bibliography. 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. Bibliography. 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. Bibliography. 4 Flux Leakage. 4.1 Division of Leakage Flux Components. 4.2 Calculation of Flux Leakage. Bibliography. 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. Bibliography. 7 Design Process and Properties of Rotating Electrical Machines. 7.1 Asynchronous Motor. 7.2

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 caron 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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