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Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The winding...
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A resonance-bending mode magnetoelectric-coupling equivalent circuit.

Mingsen Guo1, Shuxiang Dong

  • 1Department of Advanced Materials & Nanotechnology, College of Engineering, Peking University, Beijing, China.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 28, 2009
PubMed
Summary

This study introduces a new equivalent circuit model for magnetoelectric (ME) coupling in bilayer composites operating in bending mode. The model accurately predicts ME coefficients near resonance frequencies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Previous research established equivalent circuits for magnetoelectric (ME) coupling in laminated composites for various modes like L-T, L-L, and C-C.
  • These models were crucial for understanding ME interactions in layered materials.

Purpose of the Study:

  • To develop a novel equivalent circuit model for magnetoelectric (ME) coupling in laminated magnetostrictive/piezoelectric bilayer composites specifically operating in bending mode.
  • To provide a predictive tool for understanding ME coefficients in bending mode configurations.

Main Methods:

  • Development of a bending-mode equivalent circuit by introducing the concepts of mechanical voltage and mechanical current.
  • Application of the circuit model to laminated magnetostrictive/piezoelectric bilayer composites.

Main Results:

  • A functional equivalent circuit for bending-mode ME coupling in bilayer composites was successfully developed.
  • The developed circuit model demonstrates utility in predicting magnetoelectric coefficients around the resonance frequency.

Conclusions:

  • The proposed bending-mode equivalent circuit offers a valuable framework for analyzing and predicting the performance of magnetoelectric composites.
  • This work extends the applicability of equivalent circuit modeling to a new operational mode for ME composites.