On the Equivalent Circuit Models of Piezoelectric Ceramics

Abstract

The use of piezoelectric ceramics as actuators and/or sensors is prevalent. This paper is aimed to explore simple but useful equivalent circuit models of piezoelectric ceramics with the consideration of energy dissipation. Based on the electrical impedance, the equivalent circuit models of piezoelectric ceramics are investigated under unloaded and loaded conditions. The characteristics and physical meanings of the circuit models are discussed by considering the frequency range of interest. The circuit models and discussions in this paper can provide a good understanding on the behaviors of the piezoelectric ceramics when designing and analyzing the piezo-based systems and structures.

Keywords:

• Piezoelectric ceramics
• equivalent circuit model
• electrical impedance
• energy dissipation

Acknowledgment

The work described in this paper was supported by a grant from Research Grants Council of Hong Kong Special Administration Region, China (Project No. CUHK4152/08E).