Types of Transformers w. When current in the primary coil is changed the flux linked to the secondary coil also changes. The transformer is based on two principles: first, that an electric current can produce a magnetic field electromagnetism , and, second that a changing magnetic field within a coil of wire induces a voltage across the ends of the coil electromagnetic induction.
Changing the current in the primary coil changes the magnetic flux that is developed. The changing magnetic flux induces a voltage in the secondary coil. A simple transformer has a soft iron or silicon steel core and windings placed on it iron core. Both the core and the windings are insulated from each other. The winding connected to the main supply is called the primary and the winding connected to the load circuit is called the secondary.
Winding coil connected to higher voltage is known as high voltage winding while the winding connected to low voltage is known as low voltage winding.
In case of a step up transformer, the primary coil winding is the low voltage winding, the number of turns of the windings of the secondary is more than that of the primary. Vice versa for step down transformer. As explained earlier, EMF is induced only by variation of the magnitude of the flux. When the primary winding is connected to ac mains supply, a current flows through it.
Since the winding links with the core, current flowing through the winding will produce an alternating flux in the core. EMF is induced in the secondary coil since the alternating flux links the two windings.
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Finally, part 4 is devoted to the dynamics of traditional electrical machines. Also for the dynamics of induction and synchronous machine drives, the electromagnetics are used as the starting point to derive the dynamic models.
Throughout part 4, much attention is paid to the derivation of analytical models. But, of course, the basic dynamic properties and probable causes of instability of induction and synchronous machine drives are discussed in detail as well, with the derived models for stability in the small as starting point. In addition to the study of the stability in the small, a chapter is devoted to large-scale dynamics as well e.
Completely re-written, the new Second Edition also incorporatessuggestions from students and instructors who have used the First Edition, making it the best text available for junior- and senior-level courses in electric machines. The new edition features a wealth of new and improved problems and examples, designed to complement the authors' overall goal ofencouraging intuitive reasoning rather than rote memorization of material. Chapter 3, which presents the conversion of energy, now includes: analysis of magnetically coupled coils, induced emf in a coil rotating in a uniform magnetic field, induced emf in a coil rotating in a time-varying magneticfield, and the concept of the revolving field.
All problems and examples have been rigorously tested using Mathcad. This edition discusses the principles of various mathematical operations and their application to electrical machinery performance calculations. The introductory chapters deal with the matrix representation of algebraic equations and their application to static electrical networks.
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