Electromagnetic devices

Abstract

If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. CHAPTER 2 ELECTROMAGNETIC DEVICES Introductory remarksA knowledge of electromagnetism is necessary for understanding the operation of electromechanical converters and electronic systems in general, such as sensors, solid state devices and integrated circuits; also electromagnetic compatibility represents an increasingly important topic. There is a quite high degree of attention to applied electromagnetism due to the increasing number of new topics. One could mention subjects like mechatronics, superconductivity, microelectronics and biotechnologies among emerging fields in which electromagnetism plays an essential role.The complex geometry of devices and the non-linearity of magnetic circuits of electromechanical converters represent unfavourable factors for field calculation. A very small air-gap with a different number of slots in primary and secondary parts of a converter causes high gradients in the field. Therefore, a fine discretization of the field region and, sometimes, the coupling of different methodologies of analysis are necessary. The first group of papers is focused on applying field theory and advanced software to the analysis of steady state and transient performances of induction motors. Computer simulations of starting process are carried out by means of circuit and field method and compared with laboratory tests, leading to the interpretation of phenomena as motor parametric resonance. The field-circuit calculation of output characteristics of a four-speed induction motor is also achieved. Special attention is paid to skewed-cage induction motor for which a quasi-3D finite element method is proposed. The study of anomalies in magnetic field distribution due to broken rotor bars is performed for different load conditions. The use of electromagnetic software linked with electric circuit equations enables determination of motor output parameters for voltage supply. Such an approach leads to an accurate estimation of the magnetic saturation of the core. Downloaded by UNIVERSITY OF LIVERPOOL At 05:04 28 June 2016 (PT)The second group of papers is devoted to general and specific problems of reluctance motors. The application of artificial neural networks (ANN) in modelling...