摘要
为解决汽车轮胎压力无线监测系统(TPMS)电能自给问题,应用压电换能原理,提出将PZT5压电振子复合在轮胎内底面,把运行中的机械能转换为电能为无线发射模块供电的思想,设计了一种压电陶瓷轮胎发电机。建立了双层膜压电振子的有限元(FEA)模型,运用ANSYS 11.0对不同尺寸的振子进行静力和瞬态分析,得出设计振子尺寸的依据。针对单个振子发电量低的状况,提出采用阵列方式增大发电量的方案,设计了一种多振子电量耦合输出调节控制电路。选择振子尺寸为40mm×15mm,实验得到单片压电振子在15 Hz固定形变的激励下,有效输出电流为5μA,峰值电压为5 V以上。当振子数量为40个以上时,轮胎发电输出的功率能满足TPMS休眠模式耗电30μW,发射耗电35mW,间歇时间30 s的需要。实验表明,压电阵列式轮胎发电机平均输出功率为150～350μW,瞬时输出功率可达到50mW。
A novel power generator in the tire which is applied in a wireless Tire Pressure Monitor System（TPMS） was designed. The piezoelectric convertor constructed by bender arrays was merged to the inner surface of a tire to transform the mechanical deformation into the electric power and supply to the sensors of TPMS. A Finite Element Model（FEM） for the convertor was established based on the second piezoelectric function and the piezoelectric convertor with different sizes was analyzed by ANSYS 11.0 in a transient method. Then,a target of 6 cm^2 was selected to observe its characteristics, and the effective current is 5 μA. As the wireless sending component needs 10 mA every 30 s, an array with 40 piezoelectric convertors was used in the generator and a power conditioning circuit with a multiple path charge coupling module was also designed. Experiments show that when the frequency of tire rotation is 15 Hz, the average power through the conditioning circuit is 150-350 μW and the instantaneous power can reach 50 mW, which proves that the power generator can work efficiently.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2009年第6期1327-1332,共6页
Optics and Precision Engineering
基金
Supported by the National Hi-Tech Research and Development Program of China(863 Program)(Grant No .2005AA404280)
关键词
轮胎发电机
计算机仿真
压电换能
有限元法
power generator in tire
computer simulation
piezoelectric convertor
Finite Element Method（FEM）
