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Design and Implementation of Position Detection System Based on 3-UPU Parallel Mechanism

For the position detection problem of 3-UPU parallel mechanism, most of detection methods are less targeted, slow in detection speed or poor in adaptability. To solve these problems, the paper proposes a method of quadruplicated frequency. This method achieves the frequency subdivision, phase discrimination and count functions. This method improves the resolution of the photoelectric encoder and achieve the high-precision position detection. The simulation platform is designed and built in Quartus-II software environment and CPLD (Complex Programmable Logic Device) EPM240T100C5N is selected to build experiment platform. The simulation and experimental data show the validity, reliability and rapidity of this method. The method of quadruplicated frequency can acquire accurate real-time coordinates, so the position control accuracy of the parallel mechanism can be enhanced.