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Author: Takashi Kenjo
Oxford University Press (10/1991)
ISBN: 0198562403 |
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| This is an introductory work explaining the principles,
construction, and use of electric motors and their associated drive
controls. It starts from basic physics and progresses to discuss state-of-the-art
topics such as piezoelectric motors and vector control. It is largely
non-mathematical in its approach and provides an uncluttered overview
of the subject, easily accessible to beginning students in electrical
and electronic engineering as well as engineers and scientists from
other disciplines. This authoritative text is fully illustrated with
precise, clear diagrams and photographs. |
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Author: Takashi Kenjo
Oxford University Press (09/1994)
ISBN: 0198565089 |
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| This volume explores the various aspects and applications
of microprocessor-controlled electronic drives, a growing new technology
which has recently impacted the area of power electronics. It emphasizes
the manipulation and use of low and medium power motors which are
useful in the motion control of robots, computer peripherals, and
other appliances. Power Electronics for the Microprocessor Age begins
with a general overview of the relationship between computers, power
circuitry, and motors. It then provides full chapter guidance on a.c.-to-d.c.
converters, servo-amplifers, stepping-motor drives, and inverters.
The author also sets forth a unique theory on the pulse-width modulation
technique for inverters, and describes a useful method for position
control using a d.c. motor. Complete in one volume, the text covers
theory, practical circuits and software, and is illustrated with over
290 machine cutaways views and circuit diagrams. |
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Authors: Toshiiku Sashida & Takashi
Kenjo
Oxford University Press (01/1994)
ISBN: 0198563957 |
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| The ultrasonic motor, invented in 1980, utilizes
the piezoelectric effect in the ultrasonic frequency range to provide
the motive force. (In conventional electric motors the motive force
is electromagnetic). The result is a motor with unusually good low-speed
high-torque and power-to-weight characteristics. It has already found
applications in camera autofocus mechanisms, medical equipment subject
to high magnetic fields, and motorized car accessories. Its applications
will increase as designers become more familiar with its unique characteristics. |
| This book is the result of a collaboration between the inventor and an expert in conventional electric motors: the result is an introduction to the general theory presented in a way that links it to conventional motor theory. It will be invaluable both to motor designers and to those who design with and use electric motors as an introduction to this important new invention. |
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Authors: Takashi Kenjo and Akira Sugawara
Oxford University Press (03/1995)
ISBN: 0198593856 |
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| Stepping motors are used wherever repeated stop-start
or intermittent motions are encountered. Found in a diverse range
of machines such as clocks, typewriters, automatic draughting machines,
numerically controlled machine tools, and computer peripherals, stepping
motors offer easy compatibility with digital equipment and ease of
control. This thoroughly updated second edition of Stepping Motors
offers a practical approach to the subject and relates the workings,
design, and construction of these motors to underlying electromagnetic
principles. The reader is taken through a brief history of stepping-motor
development and is provided with expert treatments of the theory,
terminology, control systems, and likely applications associated with
the devices. The text is copiously illustrated with clear and helpful
diagrams and contains much detailed information. It is the perfect
introduction for students and professionals in electrical and electronic
engineering. |
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Authors: Takashi Kenjo & Shigenobu
Nagamori
Sogo Electronics Press (2003) |
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| A brushless motor is a hybrid motor that combines
the advantages of both AC and DC motors, and provides useful solutions
for state-of-the-art motion control technology. The authors have harnessed
their wide experience and knowledge to produce an informative and
concise volume on brushless motors. This work is a completely revised
version of a previous book by the authors: Permanent-magnet and Brushless
DC Motors. |
| The first three chapters provide the reader with
the basics needed for brushless motor applications. In Chapter 5,
the authors present a new theory on contemporary motors, and develop
a ‘magneto-mechanic’
theory using the periodic Stieljes integral. The Stieljes model enhances
the computation of torque taking into account the combined effects
of cogging torque due to the toothed construction and effects of winding
currents. The use of this mathematical concept allows fast computation
of magnetic circuits. Combining this advanced mathematical concept
with a novel method for computing dynamic differential equations,
the authors have linked their ‘advanced’
theory with the classical motor theory. Chapter 7 discusses the control
techniques and computational methods for brushless motor control systems.
Various strategies for controlling motor speed and position are examined.
Chapter 8 outlines various applications for brushless motors, including
computer peripherals, household appliances, industrial servo and power
applications, medical equipment, and transportation technology. |
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Authors: John Lorriman and Takashi Kenjo
Oxford Univ Press (11/1996) |
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| This fascinating analysis aims to give the West
a more balanced and realistic understanding of the key reasons for
Japan’s success. |
| Japan’s Winning Margins shows how the Japanese
learned their industrial and technological skills from the West in
the 1870s. It challenges the popular misconception that Japan is culturally
so different from the West that there are limited lessons to learn
from Japan’s stunning industrial success. It asks, for example, how
it is that the United States, with some 70,000 new MBA graduates each
year is increasingly losing the commercial battle against Japan with
an annual output of just 100 from their MBA courses. |
| Written in plain and accessible language the lessons
for the West are spelled out clearly: education, management concerned
with developing people’s potential, and relevant workplace training
are the ‘secrets’ of Japanese success. This book will be of value
to those intending to do business with Japanese companies, to those
thinking of visiting Japan, to those wishing to compete or even just
survive, against the nation which is the world’s most successful economic
power. |
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