By Saurabh Kumar Mukerji, Ahmad Shahid Khan, Yatendra Pal Singh
Electromagnetics for electric Machines deals a complete but available therapy of the linear concept of electromagnetics and its software to the layout of electric machines. Leveraging worthwhile lecture room perception received by way of the authors in the course of their amazing and ongoing educating careers, this article emphasizes ideas instead of numerical equipment, offering presentation/project difficulties on the finish of every bankruptcy to reinforce topic knowledge.
Highlighting the essence of electromagnetic box (EMF) concept and its correlation with electric machines, this book:
-- reports Maxwell’s equations and scalar and vector potentials
-- Describes the targeted circumstances resulting in the Laplace, Poisson’s, eddy present, and wave equations
-- Explores the application of the individuality, generalized Poynting, Helmholtz, and approximation theorems
-- Discusses the Schwarz–Christoffel transformation, in addition to the decision of airgap permeance
-- Addresses the surface results in round conductors and eddy currents in strong and laminated iron cores
-- comprises examples in relation to the slot leakage inductance of rotating electric machines, transformer leakage inductance, and thought of hysteresis machines
-- offers analyses of EMFs in laminated-rotor induction machines, 3-dimensional box analyses for three-phase good rotor induction machines, and more
Electromagnetics for electric Machine makes a great textual content for postgraduate-level scholars of electric engineering, in addition to of physics and electronics and conversation engineering. it's also an invaluable reference for study students curious about difficulties related to electromagnetics.
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Additional resources for Electromagnetics for Electrical Machines
Example text
However, under certain boundary conditions unique solutions for these equations can be found. The uniqueness theorem1 reviewed here describes these conditions that are equally valid for both Laplace and Poisson equations. 31 © 2015 by Taylor & Francis Group, LLC 32 Electromagnetics for Electrical Machines Let V1 and V2 be any two solutions for the Laplace equation for potential distribution in a given volume v. 5) where s indicates the surface bounding the volume v, internally as well as externally.
38 is known as Coulomb’s gauge condition. 37b is not valid. 8). 40) For known values of the source current density Jo, this equation is identified as the Poisson equation for the vector magnetic potential A. It may be noted that the Laplacian operator operating on a scalar function is defined as the divergence of gradient of the scalar function. 36. 41a) In the Cartesian system of coordinates, the three unit vectors (a x, ay and az, are constants, that is, invariant of coordinates of a point. 41d) In these equations the Laplacian is operating on scalar functions, thus it can be defined as divergence of gradient.
It may include source current density, if there is any. The vector D can be defined as the electric flux density. The term ∂D/∂t is said to be the displacement current density. In free space conduction current is zero, though there can be nonzero value for the displacement current. g. wireless communications). 8. 9b, the volume charge density ρ, at a given point, is a source for electric field. 10) where Jo indicates current source density, while the second term (σE) indicates induced current density in a conductor with conductivity σ.