直线型压电液压步进驱动器的研究

采用纯净水为媒介,在初始加载压力0.04 MPa(最佳加载压力)时研究了不同外界负载时压电驱动器的输出规律。结果表明,加载后驱动器的输出速度规律发生变化,输出推力整体趋势不变。随着负载增加,输出速度和推力逐渐降低。空载时,驱动器在频率350 Hz有最大输出速度(为25.83 mm/s);负载5 N时,驱动器在400Hz达到最大输出速度(为16.59mm/s)。在频率140~260 Hz时,驱动器负载后的输出步长近似于直线。加载压力0/0.04 MPa时,驱动器的最大承载值是30N;加载压力0.3 MPa时,驱动器的最大承载值是20N。最大承载值随加载压力的增加而逐渐减小。存在最佳负载使驱动器输出功率达到最大;适当加载压力可提高驱动器的最佳负载值。驱动器的最大输出功率在91mW以上。

Study on a Linear Piezoelectric Step Actuator

The output of the piezoelectric actuators with different external loads was researched by using pure water as the transmission medium at the initial loading pressure of 0.04 MPa (the best load pressure). The results show that the output speed of driver is changed after loading, but the trend of output thrust is invariant. With the load increase, the output speed and thrust are gradually decreased. The driver has the largest output speed of 25.83 mm/s at 350 Hz frequency when there is no load; when the load is 5 N, the maximum output speed is 16.59 mm/s at 400 Hz. At the frequency of 140~260 Hz, the output of step length is approximate a straight line after loading. The maximum bearing value is 30 N at the loading pressure of 0/0.04 MPa; and the maximum bearing value is 20 N at the loading pressure of 0.3 MPa. The maximum bearing value is decreased with the increase of pressure. There is an optimal load to maximize the drive output power, and the proper loading pressure can improve the optimal load values of the driver. The maximum output power of the driver is above 91 mW.