This book 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. 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. Print edition not for sale in South Asia (India, Sri Lanka, Nepal, Bangladesh, Pakistan or Bhutan).

Eddy currents, so-called owing to their general shape like "eddies", manifest as induced currents in all metallic - magnetic or non-magnetic - regions exposed to time varying or generally alternating magnetic fields whether of power or higher frequencies. It is imperative to apply appropriate analyses to assess the magnitude and consequences of induced eddy currents as required. Therefore, book aims at a comprehensive study of various aspects of eddy currents, from a detailed account of the basic phenomenon to their utilization in various applications, and their detrimental effects, esp. in large Turbogenerators. It gives detailed description of the finite-element technique(s) developed by the author to analyse the steady-state and transient heating of key regions of turbogenerators of ratings from 120 MW to 500 MW when exposed to "negative-sequence" currents under unbalanced fault conditions.