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PREFACE
More than half of the total electrical energy produced in developed coun
tries is converted into mechanical energy in electric motors, freeing the
society from the tedious burden of physical labor. Among many types of the
motors, three-phase induction machines still enjoy the same unparalleled
popularity as they did a century ago. At least 90% of industrial drive
systems employ induction motors.
Most of the motors are uncontrolled, but the share of adjustable speed
induction motor drives fed from power electronic converters is steadily
increasing, phasing out dc drives. It is estimated that more than 50 billion
dollars could be saved annually by replacing all "dumb" motors with
controlled ones. However, control of induction machines is a much more
challenging task than control of dc motors. Two major difficulties are
the necessity of providing adjustable-frequency voltage (dc motors are
controlled by adjusting the magnitude of supply voltage) and the nonlinear-
ity and complexity of analytical model of the motor, aggrandized by
parameter uncertainty.
As indicated by the title, this book is devoted to various aspects of
control of induction motors. In contrast to the several existing monographs
X I
XI I
CONTROL OF INDUCTION MOTORS
on adjustable speed drives, a great effort was made to make the covered
topics easy to understand by nonspecialists. Although primarily addressed
to practicing engineers, the book may well be used as a graduate textbook
or an auxiliary reference source in undergraduate courses on electrical
machinery, power electronics, or electric drives.
Beginning with a general background, the book describes construction
and steady-state operation of induction motors and outlines basic issues
in uncontrolled drives. Power electronic converters, especially pulse width
modulated inverters, constitute an important part of adjustable speed
drives. Therefore, a whole chapter has been devoted to th