太阳自动跟踪机构的设计和位姿分析

Abstract

A new type of 3-DOF sun parallel tracker was designed to track the sun all-around and to maximize its effective output powers.By using the cardan joint on a triangular platform to transfer the most of the weights of solar panels to the stand and to change the positional posture of the solar panels in all direction through three thin steel ropes,the track mechanism could reduce the electrical power consumption of own motor and could generate more efficient powers.Firstly,the forward position equations of the 3-DOF parallel tracker were established based on the theory of coordinate transformation.And then the forward position equations were solved by Newton's iterative method numerically.Finally,the space positional posture was measured and analyzed with the theory of the space parallel projection to verify the accuracy of the forward position equations.A driven energy experiment was performed to contrast the power consumption between the designed mechanism and a traditional two-axis tracker.The experimental results show that the established forward position equations and measured results have the same trend basically,and the average errors of output positional postures for space angles α,β,and distance zB are 1.8%,2.6%,0.84%,respectively.This accuracy can meet the requirements of the tracking mechanism for errors.Moreover,the power consumption of the designed tracking mechanism is about 25% that of the traditional two-axis tracker.