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The eddy current effect of laminated steel is significant to the design of high frequency transformer(10 kHz–100 kHz). In this paper, the finite element method considering the micro eddy current is proposed. And, the algorithm is discretized and implemented by Matlab. In order to verify the algorithm, a magnetic ring of nanocrystalline soft magnetic is measured at 50k Hz and 100 kHz. The simulation...
The total noise level of transformers is mainly influenced by harmonics in load current. The reasons are the interaction of harmonics with large load current at power frequency and the rising sound radiation efficiency with frequency. It is noted that the dynamic vibration behaviors under load harmonics operation are important to decrease the equipment noise. This paper mainly studies the vibration...
Contactless electrical energy transmission system (CEET) which can work under atrocious conditions realizes contactless transmission between power and loads. It is necessary to improve the efficiency of the detachable transformer, as it plays an important role in the system. Based on the structure and work principle of the system, related parameters are analyzed in this paper. Detachable transformer...
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...
Contact-less electrical energy transmission over a large air gap becomes more and more attractive for different applications. In certain applications, the stability of detachable transformers is of vital concern to maintain the stabilization of the whole system. This paper investigates the influence of horizontal and vertical displacement of primary system as well as transmission frequency on coupling...
In order to model silicon steel lamination which is widely used in larger power transformer core and magnetic shielding configurations, an virtual solid material model is adopted. the equivalent and anisotropied permeablility and the layered and anisotropied conductivity is put forward to evaluate 3-D eddy current field. The linear interpolating method is adopted based on Wh-Bm curve to compute the...
This paper presents a practical approach dealing with anisotropic laminated core joints in engineering problems, especially in large-scale transformers. A fast approximate laminated core model is proposed through discussing the feasibility of the works in domestic and abroad. It is indicated that this model provides good results in three-level-step-lap joints for saturation condition over a suitable...
This paper details the electromagnetic behavior and the effects of magnetic and electromagnetic shields used in large power transformers based on engineering-oriented benchmark models, presents some newly calculated and measured results of both magnetic field and stray-field loss related to the models, and examines the engineering applicability of 3-D eddy current analysis methods and the practical...
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