نتایج جستجو برای: maxwell stress tensor

تعداد نتایج: 489171  

Journal: :Journal of High Energy Physics 2021

A Lifshitz black brane at generic dynamical critical exponent $z > 1$, with non-zero linear momentum along the boundary, provides a holographic dual description of non-equilibrium steady state in quantum fluid, scale invariance but without boost symmetry. We consider moving branes Einstein-Maxwell-Dilaton gravity and obtain non-relativistic stress tensor complex field theory via suitable renorm...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1991
C L Pekeris K Frankowski

Using Ernst's theory of complex potentials, a solution of the coupled Einstein-Maxwell equations in oblate spheroidal coordinates is obtained for a source possessing mass, electric charge, and angular momentum. The density of the electromagnetic energy is evaluated. Explicit expressions are derived for the components of the Ricci tensor Rmunu, and of the electromagnetic energy momentum tensor E...

Journal: :Actuators 2023

This study examines the distributions of cogging and current forces in a hybrid linear motor their impact on its performance. Subsequently, using Maxwell stress tensor to analyze force acting motor, method has been proposed for calculating effect mechanical system stiffness. Based profile, it was found that noncurrent could reduce spring stiffness when is operation. An electromagnetic–mechanica...

Mehrdad Makki, Siroos Hemmati

In the permanent magnet linear synchronous motor (PMLSM), force ripple is harmful, useless and disturbing. The force ripple is basically composed of two components: detent force and mutual force ripple. This force is influenced by the geometric parameters of the permanent magnet (PM) motors; such as width, thickness and length of the magnet poles, length and thickness of the rotor and stato...

2006
D. A. Lockerby J. M. Reese R. W. Barber D. R. Emerson

The general form of Maxwell’s velocity slip boundary condition for rarefied gas flows depends on both the geometry of the surface and the constitutive relations used to relate the viscous stress to rate of strain. The dependence on geometry is often overlooked in current rarefied flow calculations, and the generality of the constitutive dependence means the condition can also be usefully applie...

2003
ROGER PENROSE

A calculus for general relativity is developed in which the basic role of tensors is taken over by spinors. The Riemann-Christoffel tensor is written in a spinor form according to a scheme of Witten. It is shown that the curvature of empty space can be uniquely characterized by a totally symmetric four-index spinor which satisfies a first order equation formally identical with one for a zero re...

Journal: :IEEE Transactions on Industrial Electronics 2022

The mechanism of torque ripple generation by time and space harmonic magnetic fields in permanent magnet synchronous motors is investigated to obtain advanced motor designs. general expression between the ripples air-gap flux densities derived using Maxwell stress tensor. Both numerical experimental verifications this are carried out. By expression, difference surface interior discussed. Based ...

Journal: :Iet Electric Power Applications 2023

The exploration of electromagnetic vibration sources is very important for the vibroacoustic reduction a squirrel-cage induction motor. However, influence high-order force on motor has not been studied before. investigated in detail. Firstly, Maxwell stress tensor method applied to calculate force. Next, transfer function introduced describe phenomenon that induces low-mode vibration. Then, for...

Journal: :energy equipment and systems 0
mehrdad makki department of electrical engineering, kermanshah university of technology, kermanshah, iran siroos hemmati department of electrical engineering, kermanshah university of technology, kermanshah, iran

in the permanent magnet linear synchronous motor (pmlsm), force ripple is harmful, useless and disturbing. the force ripple is basically composed of two components: detent force and mutual force ripple. this force is influenced by the geometric parameters of the permanent magnet (pm) motors; such as width, thickness and length of the magnet poles, length and thickness of the rotor and stator, a...

Journal: :amirkabir international journal of electrical & electronics engineering 2014
k. abbaszadeh s. maroufian

performing fast and accurate methods for modeling the electrical machines has been the subject of several studies and many authors proposed different procedures to attain this aim. beside the accuracy, the speed of the method is of great concern. on the other hand, the capability of the method to be changed according to the need is another important issue. finite element method provides relativ...

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