The Hysteresis Machines

All hysteresis machines, are characterised by the use of a ‘hard’ or permanent-magnet material in the rotor of the machine in different forms whilst the stator may be similar to that of a 3-phase induction motor or comprise salient poles. The driving torque in the hysteresis machine is typically related to loss of power resulting from hysteresis in the active part of the rotor. A hysteresis motor which forms the mainstay of a variety of hysteresis machines is a synchronous motor, being self-starting with the developed torque remaining constant throughout. The present book, one of its kind covering the said subject matter, describes in detail the construction and working principle of a variety of commercially available hysteresis machines. The last part of the book is devoted to a comprehensive study of an experimental hysteresis machine. The contents of this part derive entirely from the experimental and analytical work carried out by the author during his doctoral research at the University of Aston in the UK. The exhaustive range of tests and measurements, obtained by the use of uniquely devised transducers and techniques, many of these having been evolved for the first time, showcase numerous aspects of a hysteresis machine, never before brought out anywhere. These relate mainly to the measured waveforms of radial and peripheral flux density in the airgap and active part of the rotor as influenced by the hysteretic properties of the rotor material.
Contents:
PART A - Introduction 1. Introduction
PART B - Hysteresis Machines - General 1. The Hysteresis Motor 2. The Hysteresis Coupling 3. The Hysteresis Brake 4. The Hysteresis Clutch 5. The Hysteresis-Reluctance Motor
PART C - Experimental Hysteresis Machine and Analysis 1. General Aspects 2. Tests on the Experimental Machine 3. Computed Magnetic Flux Density Variation 4. Qualitative Theory of Operation 5. Torque Calculation using Poynting Theorem
About the Author:
Dr. S.C. Bhargava graduated in electrical engineering in 1963 and postgraduated in power systems in 1966 from the University of Roorkee, India. He used to teach graduate and (part-time) postgraduate courses at (now) N I T, Jaipur before proceeding to the UK on a University of Aston scholarship for his Ph D which he obtained in 1972. His research was heavily based on analytical and extensive experimental work using electromagnetic fields and their applications. On his return from the UK, he served as Specialist, Electromagnetic Phenomena, at Corp. R & D, B H E L, Hyderabad, from 1974 to 1999 where his research activities involved application of electromagnetic phenomena at large. Following his retirement from BHEL in 1999, he had been a visiting professor at several engineering institutes in Hyderabad, teaching graduate and postgraduate courses. He is the Fellow or Senior Member of several Professional Societies in India and abroad such as Institution of Engineers (India), Institution of Electrical Engineers (UK), Institution of Electronics and Telecommunication Engineers (India), Institute of Electrical and Electronics Engineers (USA) and Computer Society of India. His fields of interest include “biological effects of electromagnetic fields on living beings” on which he has published several papers, and “solar electricity”. He has published over 40 technical papers in National and International journals of which many were presented at National and International conferences. He is the author of the book “Electrical Measuring Instruments and Measurements”, published in 2013 by B S Publications in Hyderabad and CRC Press in the UK. The book has been approved by the JNTU as one of the text books on electrical measurements, a subject taught to EEE students of the University in III semester. His other book, titled “Finite Element Analyses of Eddy Current Effects in Turbogenerators”, dealing with special problems of turbogenerators, based on his vast experience related to electromagnetic fields and their application to analyses of turbogenerators, has been recently published by CRC Press, Taylor & Francis Group, UK. He has recently come out with a unique book titled “A Book of Physics – In Perspective” that deals comprehensively with almost all topics of physics at high school and board levels to help the students and teachers of physics alike to understand the various aspects of physics in perspective.