A Novel Vibration Piezoelectric Generator Based on Flexible Piezoelectric Film Composed of PZT and PI Layer
Abstract
:1. Introduction
2. Operating Principle
3. Electromechanical Model
4. Structural Simulation Analysis
5. Experimental Analysis
- (1)
- Under instantaneous vibration excitation, the generator generated transient voltage response, and the response time lasted 0.2 s–0.3 s. Under different load resistances, the voltage response curves of the piezoelectric generator were similar, and the response amplitudes were different. When the load resistance increased, the maximum voltage response amplitude also increased.
- (2)
- As the load resistance R increased, the maximum output voltage increased. For the output power, the maximum instantaneous power occurred at R = 35 KΩ and was 2.44 mW.
- (1)
- Under the excitation of a continuous vibration signal, the displacement of the piezoelectric MFC changed regularly and continuously in the range of 0–2 mm. The average displacement was 1.23 mm.
- (2)
- At different exciting frequencies and load resistances, the voltage response of the piezoelectric generator was similar. The difference was that the maximum output voltage increased with the increase in excitation frequency and load resistance.
- (3)
- When the excitation frequency and load resistance were constant, the output voltage of the generator varied regularly with time. The output voltage waveform approximated sinusoidal law.
- (1)
- With the increase in load resistance, the peak voltage and effective value first increased, and then tended to be stable or even slightly decrease. The maximum peak voltage and effective voltage were 12.22 V and 8.64 V, respectively, and occurred at the load resistance of 40 kΩ and the excitation frequency of 25 Hz. When the load resistance was constant, the peak voltage and effective voltage increased with the increase in excitation frequency. When the load resistance was 40 kΩ, the voltage change was more obvious.
- (2)
- When the excitation frequency was less than 20 Hz, the maximum power and average power tended to be stable with the change in load resistance. When the excitation frequency was greater than 20 Hz, the output power was not stable. The power decreased with the increase in load resistance. The maximum power and average power of the piezoelectric generator were 4.82 mW and 2.41 mW, respectively, occurring at the load resistance of 20 kΩ and the excitation frequency of 25 Hz.
- (3)
- The instantaneous voltage of the generator was very close to the simulated voltage. The maximum error between the instantaneous voltage corresponding to different load resistor and the simulation voltage was 15.7%, which occurred when R was 10 kΩ. The instantaneous voltage and simulation voltage had the same variation rule, and the instantaneous voltage was less than the continuous voltage.
- (4)
- As the load resistance changed, the maximum simulation power values remained unchanged. The reason was that the output power was not affected by the load resistance based on Equation (12). The instantaneous power fluctuated within the range of 2.34 mW–2.44 mW. The continuous power increased first and then decreased, and its power range was 3.25 mW–4.82 mW. When the load resistance R was 20 kΩ and 25 kΩ, the continuous power was close to the average power, and the errors were 5.24% and 2.84%, respectively. There was a significant difference between instantaneous power and continuous power. For instantaneous power, which was generated only for a very short time, due to the lack of continuous excitation, its power was relatively small. For continuous power, the maximum output power was close to the calculated value. When the load resistance was small, the energy was not fully released and the power was small, while when the load resistance was large, the stability of the output power was reduced and the power was slightly reduced. Hence, the instantaneous power and continuous power in Figure 12f were inconsistent with the calculated results.
6. Conclusions
- (1)
- The transient excitation voltage of the proposed piezoelectric generator increased with the increase in load resistance, while the continuous excitation voltage increased first and then tended to be stable or slightly decreased.
- (2)
- The maximum continuous power produced by the piezoelectric generator was about 4.82 mW.
- (3)
- The simulation results agreed well with the experimental results on continuous excitation voltage and power with load resistances of 20 kΩ and 25 kΩ.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | PLA | Spring Steels |
---|---|---|
Use | Support structure | Elastic vibrator |
Density (kg/m3) | 1.12 | 7.81 |
Young’s modius (GPa) | 2.7 | 197 |
Poisson’s ratio | 0.39 | 0.25 |
Buk modulus (GPa) | 4.1 | 131 |
Shear modulus (GPa) | 0.97 | 78.8 |
Parameter | Values | Parameter | Values |
---|---|---|---|
Working mode | d31 | Effective working length | 28 mm |
Thickness | 300 μm | Effective working width | 14 mm |
Electrode | Standard lead-free solder S-Sn99Cu1 | Total length | 37 mm |
Capacitance | 48 nF | Total width | 18 mm |
Upper limit of operating frequency | <1 MHz |
Order | First Order | Second Order | Third Order | Fourth Order |
---|---|---|---|---|
Frequencies (Hz) | 2107.8 | 2353.9 | 2905.1 | 3456.1 |
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Wang, J.; Tong, Y.; Li, C.; Zhang, Z.; Shao, J. A Novel Vibration Piezoelectric Generator Based on Flexible Piezoelectric Film Composed of PZT and PI Layer. Polymers 2022, 14, 2871. https://doi.org/10.3390/polym14142871
Wang J, Tong Y, Li C, Zhang Z, Shao J. A Novel Vibration Piezoelectric Generator Based on Flexible Piezoelectric Film Composed of PZT and PI Layer. Polymers. 2022; 14(14):2871. https://doi.org/10.3390/polym14142871
Chicago/Turabian StyleWang, Jia, Yujian Tong, Chong Li, Zhiguang Zhang, and Jiang Shao. 2022. "A Novel Vibration Piezoelectric Generator Based on Flexible Piezoelectric Film Composed of PZT and PI Layer" Polymers 14, no. 14: 2871. https://doi.org/10.3390/polym14142871