IEEE Power & Energy Magazine - May/June 2014 - 118

book review

electric machinery
analysis and details of the subject

T

There is one book reviewed
in this issue. The third edition of this
text on electric machinery has reference-frame theory at its core, the
reviewer states, and is recommended
for "those with a need for electric
machinery modeling and simulation."

Analysis of Electric
Machinery and Drive
Systems, Third Edition
by Paul Krause, Oleg Wasynczuk, Scott
Sudhoff, and Steven Pekarek
Analysis is a word that means a scrutiny, enquiry, explanation, or dissection.
Analysis is the perfect word to describe
this book. This work gets to the details
of modeling electric machines, motors
and generators, and drives systems.
As stated in the preface, "...referenceframe theory is at the core of this book."
The changes and additions in this third
edition are important.
Chapter 1 begins with a basic but
thorough discussion of the theory behind electromechanical energy conversion and magnetically coupled circuits
starting out, of course, with the transformer and moving on to the rotating
machine. one of the interesting issues
is that some of the inductances are a
function of the rotor position. Chapter
2 introduces distributed winding and
rotating air-gap magnetomotive force.
This chapter also addresses flux linkages, e.g., the magnetizing flux that
crosses the air gap and couples the
rotor and stator, and the leakage flux
Digital Object Identifier 10.1109/MPE.2014.2304685
Date of publication: 17 April 2014

118

ieee power & energy magazine

that does not cross the air gap. Then
we come to Chapter 3, a study of reference-frame theory.
The chapter
starts out with a
brief but interesting
background on reference frames. it all
began in the late
1920s by r.h. Park.
Four basic reference
frames are discussed: 1) reference fixed to the
rotor, 2) reference
fixed to the stator,
3) a synchronously
rotating reference
frame, and 4) the
arbitrary reference
frame. This chapter is relatively short
but one to be studied well to understand how these reference frames can
be used and why one may be preferred
over another. keep in mind that some
of these go by a different name, e.g., the
rotor fixed frame may be called the "dq
frame" and the stator fixed frame may
be simply the "fixed frame."
After explaining the material in the
first three chapters, the authors put the
material to work on permanent-magnet
(PM), synchronous, and induction machines in the next three chapters. Chapter 4 addresses the PM motor, which
lends itself ideally to controlled voltage
or current source inverter applications.
The authors point out that, with the
proper control strategy, the PM motor
and drive can be used to 1) improve
the performance of the PM motor, 2)

operate at maximum torque per amp,
3) provide field weakening to increase
the speed range for
constant power, and
4) shift the voltage
phase to obtain the
maximum torque at
any speed.
The synchronous
machine is covered
in Chapter 5. First the
synchronous motor
(current into the stator) is discussed, and
then the synchronous
generator (current out
of the stator), both
steam and hydro, are
evaluated. The discussion of torque-angle and critical clearing time are especially interesting. The authors seem to
imply that large synchronous generators are equipped with damper windings on the rotor. it is my experience
that dedicated copper damper windings
are not provided on two- and four-pole
generator rotors. Manufacturers use a
variety of rotor wedge materials to act
as a damper winding to allow the rotor
to withstand the negative sequence currents identified in ieee C50.13 without
injurious overheating. in Chapter 6 we
get to the industry's work horse, the induction motor. The chapter starts with
the classical equations using machine
variables and moves in the referenceframe evaluations. of particular interest are Figures 6.11-1-6.11-5, showing
the free acceleration characteristics of
an induction motor using the machine
may/june 2014



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