ac motor control and electric vehicle applications pdf
The importance of motor control technology has resurfaced recently, since motor
efficiency is closely linked to the reduction of greenhouse gases. Thus, the trend is to
use high-efficiency motors such as permanent magnet synchronous motors (PMSMs)
in home appliances such as refrigerators, air conditioners, and washing machines.
Furthermore, we are now experiencing a paradigm shift in vehicle power-trains.
The gasoline engine is gradually being replaced by the electric motor, as society
requires clean environments, and many countries are trying to reduce their petroleum
dependency. Hybrid electric vehicles (HEVs), regarded as an intermediate solution
on the road to electric vehicles (EVs), are steadily increasing in proportion in the
market, as the sales volume increases and the technological advances enable them
to meet target costs.
Along with progress in CPU and power semiconductor performances, motor control techniques keep improving. Specifically, the remarkable integration of motor control modules (PWM, pulse counter, ADC) with a high-performance CPU core makes it easy to implement advanced, but complicated, control algorithms at a low cost. Motor-driving units are evolving toward high-efficiency, low cost, high-power density, and flexible interface with other components.
This book is written as a textbook for a graduate level course on AC motor
control and electric vehicle propulsion. Not only motor control, but also some motor
design perspectives are covered, such as back EMF harmonics, loss, flux saturation,
reluctance torque, etc. Theoretical integrity in the AC motor modeling and control
is pursued throughout the book.
In Chapter 1, basics of DC machines and control theories related to motor control
are reviewed. Chapter 2 shows how the rotating magneto-motive force (MMF) is synthesized with the three-phase winding, and how the coordinate transformation maps
between the abc-frame and the rotating dq-frame are defined. In Chapter 3, classical
theories regarding induction motors are reviewed.
From Chapter 4 to Chapter 6,
dynamic modeling, field-oriented control, and some advanced control techniques for
induction motors are illustrated. In Chapter 5, the benefits and simplicity of the
rotor field-oriented control are stressed. Similar illustration procedures are repeated
for PMSMs from Chapter 7 to Chapter 9. Chapter 9 deals with various sensorless
control techniques for PMSMs including both back EMF and signal injection–based
methods. In Chapter 10, the basics of PWM, inverter, and sensors are illustrated.
From Chapter 11 to 14, electric vehicle (EV) fundamentals are included. In
Chapter 11, fundamentals of vehicle dynamics are covered. In Chapter 12, the
concept and the benefits of electrical continuous variable transmission (eCVT) are
discussed. In Chapter 13, battery EV and plug-in HEV (PHEV), including the
properties and limits of batteries, are considered. In Chapter 14, some EV motor
issues are discussed.