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The problem of eddy current generated by the gradient coil in superconducting MRI is discussed. A three-dimensional finite element model is set up to simulate the magnetic flux density generated by the eddy currents of the gradient coil in the patient region. A transversal gradient coil is designed and validated with the three-dimensional finite element method.
An improved approach for predicting the armature reaction field in Permanent-Magnet AC (PMAC) machines is presented, and eddy current reaction is take into account. Winding configuration of PM machines could be various, such as concentric winding or lap winding, integral or fractional slot winding, distributed or concentrated winding, single-layer or double-layer winding. Starting with the field produced...
Planar switched reluctance motors (PSRMs) have the merits of simple structure, low cost, low heat loss, high precision, ease of manufacture, and strong adaptability of harsh environment, which directly transform the mechanical energy to electromagnetic energy available to planar motions without mechanical transmissions. Therefore, PSRMs are an attractive candidate in high-precision two-dimensional...
In order to increase recording density in hard disk drives (HDDs), thermal flying height control (TFC) sliders have recently been introduced to reduce the head-disk spacing to less than 2 nm [1]. Slider/disk contacts increase with a decrease in flying height, and consequently, the likelihood of disk failure due to slider/disk contacts increases [2]. Contacts occur predominantly between the thermal...
In order to explore some unknown territory and capture information from distant infinite space more effectively, reflector antennas tend to larger diameter and higher operating frequencies. Along with this trend, the influence of elastic deformation of antenna structure to the dynamics is much more significantly. However, the number of antenna nodes in finite element models often reach to tens of...
A general method to model rotary machines using finite-element method (FEM) of transient magnetic field computation is presented. The merits of the proposed methods are that the nonlinear iteration on the rotor position is avoided; a curvilinear element is used in the two sides of the sliding surface; the methods being proposed to deal with matching boundaries and periodic boundaries are very general,...
In this paper, an axial-radial flux compound-structure permanent-magnet synchronous machine (CSPMSM) which consists of one axial-flux PMSM and one radial-flux PMSM is investigated. The purpose of this kind of machine is to keep the internal combustion engine (ICE) operating at maximum efficiency by harmonizing its two machines during all driving cycles in hybrid electric vehicle (HEV), and therewith...
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