This paper takes a typical 220 kV three-phase three-limb oil-immersed transformer as an example, this paper building transient field-circuit coupled model and 3D coupled magneto -fluid-thermal model. Considering a nonlinear B–H curve, the magneto model uses the field-circuit coupled finite element method (FEM) to calculate the magnetic flux distribution of the core and the current distribution ...

The purpose of this lab was to test Faraday’s Law using a Linear Variable Differential Transformer (LVDT). Basically, an LVDT consists of three coils (of 100 windings each) spaced evenly along an insulating rod. A voltage of around 6 V was applied across the inner coil, and a ferromagnetic rod was inserted into the solenoids. According to Faraday’s Law, a changing magnetic flux within the ferro...

leads and windings due t o eddy cu r ren t s induced in the conductors by t h e al ternat ing magnetic field. The leads and windings a r e connected in series, therefore, t he high-frequency resistance of t he transformer R t is An accurate, analyt ical method is proposed f o r calculating the lead and winding high-frequency resistance of complex transformer constructions. High-frequency resist...

This paper presents a novel approach to determine geometric shapes of flux modulation poles (FMPs) by using the analytical equations for flux density distribution due to armature windings. The magnetic field by the windings is modulated by the FMPs. Then, the resulting magnetic field produces the torque by interacting with the rotor permanent magnets (PMs). Thus, to improve the output power of ...

This paper presents the comparison results between two new generator configurations. These generator units are namely a field assisted switched reluctance generator (SRG) and a brushless dc (BLDC) generator. No permanent magnets are used in either unit. The field assisted SR generator consists of two magnetically dependent stator and rotor sets (layers), where each stator set includes twelve sa...

A model is suggested for the geometry of DNA entry into a bacteriophage head. It accounts for recent observations indicating absence of a unique, ordered sequence of windings in the packaged DNA.