existence of capacity drop phenomenon, as the difference between pre-queue and queue discharge flow rates, has been one of the controversial concepts of traffic engineering. several researches have focused on capacity drop existence and also its estimation issues. this paper aims to estimate capacity drop based not only on a comparison between breakdown and queue discharge flow rates, but also ...

High temperature is one of the important reasons causing the fire in power system. Therefore, the early warning could be told by monitoring the temperature and effective measures could be taken. The corresponding accidents will be reduced. The traditional transformer winding temperature monitoring methods are electrical signal measurement and infrared measurement. Such electrical signal sensors...

This paper deals with magnetic modeling of a bearingless synchronous reluctance motor. The motor under consideration includes two separate sets of three-phase windings, one for torque production and the other one for radialforce production. This paper demonstrates by means of finite-element analysis, that it is unrealistic to assume the two three-phase windings to be decoupled from one another....

Fiber winding tension is an important factor in the molding techniques of composite material which influences the quality of winding product directly, and the tension control is a key technique in fiber winding techniques. This paper introduces a closed-loop tension control system with the programmable logic controller (PLC) with function modules as its control kernel, the alternating current (...

given the strategic remarkable rank of pistachio in non-oil exports, inputs’ management in its production is so important. as the scarcest input in agricultural sector, water is considered to be among the most important inputs of pistachio production.water inadequate supply and limate conditions increase water demand in pistachio growing areas. it is necessary to determine the real value or pri...

Electromagnetic forces in power transformer windings are produced by interaction between the leakage fluxes and current passing them. Since the leakage flux distribution along the windings height is in two axial and radial directions, so the electromagnetic forces have two components, radial and axial. There is a risk that a large electromagnetic force due to the short circuit or inrush current...

This paper describes a 3D finite element (FE) based method to calculate the proximity losses for magnetic components in power conversion system. The loss is main concern of copper which causes ac winding. FE model built on definitions geometries, meshes, materials, electric circuits, boundary conditions, load as well characteristics wire. total sum each calculated with density function using ob...

A general model of the mul t ip l e winding transformer and coupled inductor i s presented, in which all parameters can b e directly measured. The approach is suitable f o r all winding geometries, and s i m p l i f y i n g approximations can be easily made. This model can be applied in determination of c r o s s regulation, current ripple, and s m a l l s i g n a l dynamics of multiple-output ...

New solutions to the abelian U(1) Higgs model, corresponding to vortices of integer and half-integer winding number bound onto the edges of domain walls and possibly surrounded by annular current flows, are described, based on a fine-grained analysis of the topology of such configurations in spacetime. The existence of these states, which saturate BPS bounds in specific limits and are quite rem...

The paper describes key features and shows some advantages and disadvantages of two measurement approaches used in determination of magnetic properties of soft-magnetic wound cores. The first approach is based on a measuring principle in which the current through the primary winding determines the sinusoidal magnetic flux density in the core and consequently also the sinusoidal induced voltage ...