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  • Enhanced Pseudo-sensorless ...
    Hace, Aleš; Franc, Marko

    Automatika, 20/1/1/, Letnik: 55, Številka: 3
    Journal Article

    In this paper, the problem of external sensors within bilateral teleoperation is addressed. We propose a Phase Locked Loop (PLL) αβ-tracker that presents an enhanced approach for position and velocity estimation. The proposed approach offers some advantages over the method presented in our previous research that was introduced to enable pseudo-sensorless teleoperation. Such approach applies PMLSM actuators with analog Hall sensors built in a motor housing. They allow obtaining sufficient position, velocity, and force information for teleoperation by a haptic interface. Furthermore, FPGA has been utilized for the implementation in order to achieve high control rate that was already introduced as a necessity in cutting edge performance systems. However, main advantages of the method presented in this paper is attributed to improved system performance due to the better signal-noise ratio and to enhanced flexibility of hardware resources consumption. Thus, high-performance bilateral control can be achieved. Such bilateral teleoperation with a dedicated haptic interface can significantly improve surgical robotics. The proposed approach was experimentally validated by the simple 1-DoF laboratory bilateral teleoperation system.