The Measurement And Control System Of Double Drive Piezoelectric Platform

The piezoelectric pile has a good application prospect In the aspect of the motor with properties of fast response?high accuracy?power self-locking?thrust large. The new type of double foot piezoelectric motor made of four groups of piezoelectric stack has the advantages of high accuracy?interval of convergence?large travel?diverse driving signal. The motion platform driven by two double drive piezoelectric linear motor can achieve a degree of freedom motor movement into multiple degrees of freedom of movement. Linear motor drive needs corresponding four road of every two orthogonal sine wave. drive signal can't distortion; The method of insert capacitance can improve the step distance along with the change of frequency of the motor can achieve high precision in open loop control,in low frequency and short distance, but a higher input voltage. so, This article has carried on the corresponding design and open loop control experiment was carried out. The research content and main job as follows:1) The paper introduces the hysteresis of piezoelectric stack and impedance model and the impedance characteristics of the experiment,proves that the limitations of current control in a certain frequency band and amplifying circuit design requirements are put forward2)The paper analyzes the structure of the motor, the request of the drive signal. The interval characteristics of motor, To insert the capacitance changes on the step motor from the characteristic has carried on the experiment Prove It is possible to the high accuracy of open loop control3)The paper analyzes the Boost booster circuit, puts forward the theory of changing ratios of pressure to output bias sine wave, analysises the duty ratio calculation complexity; advances the theory of real time power fixed pressure rise ratio,Simple and feasible, And the power amplifier is analyzed.4) In combination with Voltage amplifier and power amplifier,A new type of amplifier circuit is designed and has been carried on the simulation and experiment,The Results show that amplifying circuit work effect is good.