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The recent development of low power electronic integrated circuits (ICs) poses higher and higher energy consumption constraints on the energy harvesting (EH) devices. The DC/DC converting stage is backed-up by electric power transformers. This paper presents the mathematical model and numerical simulation results for a small size, planar flyback power transformer (FBT), whose central column is provided...
Zero sequence magnetic flux, generated in transformer core in different operation cases, is forced out of the core including the oil gap and the tank. These off-core flux paths can be represented by inductances in a duality transformation based electrical transformer model. These off-core inductances mainly determine the zero sequence impedance that is vital in analyzing a transformer subjected to...
The failures caused by short circuits are one of the causes of transformer outages. The short circuit currents induce excessive forces in the transformer windings which result in winding deformations affecting the mechanical and electrical characteristics of the winding. In the present work, a 722VA transformer winding is considered for the short circuit force and displacement analyses. The winding...
This paper presents a model for calculating and balancing the current distribution in parallel windings of furnace transformers. The proposed model is based on the finite-element method and takes into account the ??skin effect?? impact on the individual conductor resistances and self inductances. Because of mutual inductive coupling between the parallel windings, electromagnetic forces will cause...
Transformers are required to demonstrate the operative ability by analysis of electromagnetic characteristic and parameters calculation, and it is difficult to describe the winding deformation quantitatively. Based on finite element method (FEM), the model comprising iron-core and windings is shown. In this paper, the electromagnetic characteristic is analyzed by coupled field-circuit, and the leakage...
Contact-less electrical energy transmission system (CEET) becomes more and more attractive for various applications. A coreless detachable transformer used for CEET is investigated in this paper. Equivalent circuit model of detachable transformer was established and analyzed. And the flux distribution of the proposed detachable transformer was attained using finite element method (FEM). The flux simulation...
Contact-less electrical energy transmission system has become more and more attractive in power transmission area these years because there is no direct electrical connection or physical contact between the energy transmission system and the power receiver. This paper presents the function principle of contact-less electrical energy transmission systems and new developments. Equivalent circuit model...
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