Analysis and Control of Electric Drives
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Analysis and Control of Electric Drives

Simulations and Laboratory Implementation

Ned Mohan, Siddharth Raju

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eBook - ePub

Analysis and Control of Electric Drives

Simulations and Laboratory Implementation

Ned Mohan, Siddharth Raju

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About This Book

A guide to drives essential to electric vehicles, wind turbines, and other motor-driven systems

Analysis and Control of Electric Drives is a practical and comprehensive text that offers a clear understanding of electric drives and their industrial applications in the real-world including electric vehicles and wind turbines. The authors—noted experts on the topic—review the basic knowledge needed to understand electric drives and include the pertinent material that examines DC and AC machines in steady state using a unique physics-based approach. The book also analyzes electric machine operation under dynamic conditions, assisted by Space Vectors.

The book is filled with illustrative examples and includes information on electric machines with Interior Permanent Magnets. To enhance learning, the book contains end-of-chapter problems and all topics covered use computer simulations with MATLAB Simulink and Sciamble Workbench software that is available free online for educational purposes. This important book:

  • Explores additional topics such as electric machines with Interior Permanent Magnets
  • Includes multiple examples and end-of-chapter homework problems
  • Provides simulations made using MATLAB Simulink and Sciamble Workbench, free software for educational purposes
  • Contains helpful presentation slides and Solutions Manual for Instructors; simulation files are available on the associated website for easy implementation
  • A unique feature of this book is that the simulations in Sciamble Workbench software can seamlessly be used to control experiments in a hardware laboratory

Written for undergraduate and graduate students, Analysis and Control of Electric Drives is an essential guide to understanding electric vehicles, wind turbines, and increased efficiency of motor-driven systems.

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Part I
Fundamentals of Electric Drives

Electric Drives: Introduction and Motivation

Electric machines and electric drives are shown by their block diagrams in Fig. 1-1a and b. Electric machines were invented more than 150 years ago and have been in use ever since in increasing numbers in a variety of applications. As shown in Fig. 1-1a, electric machines convert energy from the electrical system to the mechanical system, and vice versa. In their motoring mode, where the machine is called a motor, the electric power Pelect from the electrical system at the certain voltage/current magnitude and frequency get converted to the mechanical power Pmech to the mechanical system at corresponding torque and speed. The opposite is true for a machine in its generator mode, where power from the mechanical system gets converted and is supplied to the electrical system. In machines, as shown in Fig. 1-1a, some of the quantities (voltage/current, torque/speed) are dictated by external sources, and no attempt is made to control the others.
Schematic illustrations of (a) electric machines and (b) electric drives.
Fig. 1-1 Block diagrams of (a) electric machines and (b) electric drives (motoring mode shown).
However, in certain applications, it is required that for given quantities on the electrical or the mechanical side, the other quantities be controlled, as in a wind turbine. This is made possible in electric drives shown by their block diagram in Fig. 1-1b. It should be noted that in the literature and in trade publications, electric drives sometimes refer only to the power electronic converter and its control, excluding the motor. In this textbook, however, electric drives refer to the entire block, which is shown dotted in Fig. 1-1b, that includes power electronic converter (power processing unit – PPU) and its control, as well as the electric machine, whether it is in its motoring or the generating mode. We should also note that we will be looking at only the ac machines, hence the title of the book is ac drives.


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