步進式壓電驅動直線運動系統(tǒng)的研究
[Abstract]:With the rapid development of optical fiber docking, adaptive optics and other modern precision industries, the research of precision motion platform has become the key support for further research in these fields. According to the different driving requirements of precision motion platform, a variety of new drivers have been produced. Stepping piezoelectric actuator is a new type of actuator, which has the advantages of large stroke, high resolution, simple structure, quick response, stable operation and no electromagnetic interference. Therefore, the establishment of a linear motion system with stepping piezoelectric actuator as the core is of great significance to the research of this kind of actuator and its practical application in the motion platform. In this paper, the basic configuration of a biped step piezoelectric actuator is proposed, the actuation principle of the actuator is analyzed, the action time sequence of the actuator is programmed, and two kinds of structure schemes of the actuator are designed. In order to analyze the structure of the actuator, the equivalent model of the clamping force analysis is established, and the calculating formula of the clamping force is derived. The finite element simulation software ANSYS is used to analyze the driver, and the structure scheme and specific structure parameters of the driver are determined. The correlation analysis provides a theoretical basis for the design of bipedal piezoelectric actuator. According to the actual driving requirements of biped stepping piezoelectric actuator, the corresponding driving power supply and motion control system are developed in this paper, which can be used to control the drive and motion state of the actuator. The driving power supply consists of a positive and negative DC voltage power supply circuit and a linear amplifier circuit. It has the ability to output the drive signal with adjustable four-channel voltage, frequency and phase difference, and the output drive signal can be controlled by the input control signal. The test results of driving power supply show that the output voltage is in the range of 鹵200V, and it has good linearity and driving ability. The motion control system is developed with the Simulink Real-Time toolkit of Matlab. It can output four control signals and has the function of position detection to realize the real-time control of the motion state of the driver. Finally, the linear motion system of step-by-step piezoelectric drive is built. The system consists of bipedal piezoelectric actuator, driving power supply and motion control system. The mechanical output characteristics of biped stepping piezoelectric actuator and the motion characteristics of linear motion system are tested. The experimental results verify the correctness of the equivalent model and provide data support for the design of motion control program. The experimental results show that the maximum driving force of the driver is 13.2N and the maximum average speed is 47.6 渭 m / s. By measuring and collecting the position information, the motion control system can realize the position control of the linear motion system by changing the step distance. Under the step mode, the positioning precision is 鹵1 渭 m.
【學位授予單位】:哈爾濱工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN384
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