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Related Concept Videos

Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the rated...
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Modeling of a disk-type piezoelectric transformer.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2007
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Investigating the Potential of Singly Curved Thin Piezoelectric Transducers for Energy Harvesting and Structural Health Monitoring
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Modeling and analysis on ring-type piezoelectric transformers.

Shine-Tzong Ho1

  • 1Mechanical Engineering Department, Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan. stho@cc.kuas.edu.tw

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 7, 2007
PubMed
Summary

This study introduces an electromechanical model for ring-type piezoelectric transformers (PTs), detailing their vibration characteristics and deriving equations for performance simulation. Experimental validation confirms the model's accuracy for PT analysis.

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Area of Science:

  • Electromechanical systems
  • Piezoelectric devices
  • Transformer technology

Background:

  • Piezoelectric transformers (PTs) offer high efficiency and power density.
  • Accurate modeling is crucial for optimizing PT performance.
  • Ring-type PTs present unique vibration characteristics.

Purpose of the Study:

  • To develop a comprehensive electromechanical model for ring-type piezoelectric transformers.
  • To analyze the vibration characteristics of the piezoelectric ring.
  • To simulate and predict the performance of PTs under various conditions.

Main Methods:

  • Analysis of piezoelectric ring vibration with free boundary conditions.
  • Derivation of electromechanical equations of motion using Hamilton's principle.
  • Simulation of coupled electromechanical systems.

Main Results:

  • The model accurately predicts PT performance metrics like voltage ratio, impedance, power, and efficiency.
  • Optimal load resistance and maximum efficiency were determined.
  • Experimental results showed good agreement with theoretical predictions.

Conclusions:

  • The presented electromechanical model provides a reliable tool for designing and analyzing ring-type piezoelectric transformers.
  • The study validates the theoretical approach through experimental comparison.
  • This work contributes to the advancement of efficient piezoelectric transformer technology.