Reluctance Electric Machines

Design and Control

Ion Boldea, Lucian Tutelea

• Publisher: CRC Press
• Year: 2018
• Print ISBN: 9781498782333
• eBook ISBN: 9780429857355
• Edition: 1
• Topic: Technology & Engineering
• Subtopic: Electrical Engineering & Telecommunications
• Index: Technology & Engineering

Electric energy is arguably a key agent for our material prosperity. With the notable exception of photovoltaic generators, electric generators are exclusively used to produce electric energy from mechanical energy. More than 60% of all electric energy is used in electric motors for useful mechanical work in various industries. This book presents the modeling, performance, design, and control of reluctance synchronous and flux-modulation machines developed for higher efficiency and lower cost. It covers one- and three-phase reluctance synchronous motors in line-start applications and various reluctance flux-modulation motors in pulse width modulation converter-fed variable speed drives.

FEATURES

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• Presents basic and up-to-date knowledge about the topologies, modeling, performance, design, and control of reluctance synchronous machines.

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• Includes information on recently introduced reluctance flux-modulation electric machines (switched- flux, flux-reversal, Vernier, transverse flux, claw pole, magnetic-geared dual-rotor, brushless doubly fed, etc.).

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• Features numerous examples and case studies throughout.

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• Provides a comprehensive overview of all reluctance electric machines.

1

Reluctance Electric Machines

An Introduction

1.1Electric Machines: Why and Where?

Electric machines provide the conversion of electric energy (power) into mechanical energy (power) in motor operation, and vice versa in generating operation. This dual energy conversion presupposes energy storage in the form of magnetic energy located mainly in the airgap between the stator (fixed) and rotor (rotating) parts and in the permanent magnets (if any).

Energy is the capacity of a conservative system to produce mechanical (useful) work. As all we do in industry is, in fact, temperature and motion control, we may reduce it to energy control for better productivity and energy savings for a given variable useful output.

The main forms of energy are mechanical (kinetic and potential), thermal, electromagnetic (and electrostatic), and electrochemical.

According to the law of energy conservation, energy may not be created or disappear but only converted from one form to another. In addition, each form of energy has its own fundamental laws that govern its conversion and control, all discovered experimentally over the last three centuries.

Energy conversion starts with a primary source:

•Fossil fuels (coal, gas, petroleum, nuclear, waste)

•Solar thermal irradiation (1 kW/m2, average)

•Solar photovoltaic source

•Wind (solar, ultimately) source

•Geothermal source

•Hydro (potential or kinetic) sources: potential (from water dams) and kinetic (from rivers, marine currents, and waves)

In the process of energy conversion, electric machines are used to produce electric power, which is very flexible in transport and rather clean, and allows for fast digital control. Only in solar photovoltaic energy conversion (less than 1% of total) are electric machines not involved.

Electric machines are ubiquitous: there is one in every digital watch; three (the loudspeaker, microphone, and ring actuator) in a cellular phone; tens in any house (for various appliances) and in automobiles; and hundreds on trains, streetcars, subway systems, ships, aircraft, and space missions, not to mention most industrial processes that imply motion control to manufacture all the objects that make for our material prosperity.

So far, the more electricity (installed power) used per capita (Norway leads the way), the higher the material living standard. Environmental concerns are shifting this trend toward an optimal (limited) installed electric power (kW/person) in power plants per citizen, which, through distributed systems that make use ...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Contents
• Preface
• Chapter 1: Reluctance Electric Machines: An Introduction
• Chapter 2: Line-Start Three-Phase Reluctance Synchronous Machines: Modeling, Performance, and Design
• Chapter 3: Phase-Source Line-Start Cage Rotor Permanent Magnet–Reluctance Synchronous Machines: Modeling, Performance and Design
• Chapter 4: Three-Phase Variable-Speed Reluctance Synchronous Motors: Modeling, Performance, and Design
• Chapter 5: Control of Three-Phase Reluctance Synchronous Machine and Permanent Magnet–Reluctance Synchronous Machine Drives
• Chapter 6: Claw Pole and Homopolar Synchronous Motors: Modeling, Design, and Control
• Chapter 7: Brushless Direct Current–Multiple Phase Reluctance Motor Modeling, Control, and Design
• Chapter 8: Brushless Doubly-Fed Reluctance Machine Drives
• Chapter 9: Switched Flux–Permanent Magnet Synchronous Motor Analysis, Design, and Control
• Chapter 10: Flux-Reversal Permanent Magnet Synchronous Machines
• Chapter 11: Vernier PM Machines
• Chapter 12: Transverse Flux Permanent Magnet Synchronous Motor Analysis, Optimal Design, and Control
• Chapter 13: Magnetic-Geared Dual-Rotor Reluctance Electric Machines: Topologies, Analysis, Performance
• Chapter 14: Direct Current + Alternating Current Stator Doubly Salient Electric Machines: Analysis, Design, and Performance
• Index