Mechanical to electrical energy conversion with a PZT stack
This paper analyzes the efficiency of piezoelectric ceramic for purposes of electric power generation. An analytical model is presented for a PZT stack with a prescribed sinusoidal force input driving power through the PZT into a resistive load. The model suggests that the primary problem of using PZT for electric power generation is that most energy is stored in the ceramic and returned to the mechanical port. A measure of efficiency consisting of the ratio of input to output effective power is defined to characterize the energy throughput from the mechanical to the electrical port. Analytical results for efficiency as a function of force input frequency and resistive load are derived based upon a linearized model of a commercially available PZT stack. The analysis yields counterintuitive results in that maximum efficiency occurs in a low frequency region, several orders of magnitude below the structural resonance of the stack. The analytical results are followed by presentation of experimental data that substantiate the model. The model is then utilized to show that, due to hysteresis in the ceramic, the efficiency of energy transfer is dependent on the amplitude of force input, and that greatest efficiencies can be achieved with maximum input forces.
- Research Organization:
- Vanderbilt Unit., TN (US)
- OSTI ID:
- 20000376
- Resource Relation:
- Conference: 33rd Intersociety Energy Conversion Engineering Conference, Colorado Springs, CO (US), 08/02/1998--08/06/1998; Other Information: 1 CD-ROM. Operating system required: Windows 3.x; Windows95/NT; Macintosh; UNIX. All systems need 2X CD-ROM drive., PBD: 1998; Related Information: In: Proceedings of the 33. intersociety energy conversion engineering conference, by Anghaie, S. [ed.], [2800] pages.
- Country of Publication:
- United States
- Language:
- English
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