Position Accuracy Measurement and Error Compensation of Servo Electric Cylinder Test Platform

Pengbin Li, Peng Zhang, Xiaohe Huang, Yongqi Cheng, Sanyi Chen, Bin Zhao


At present, the domestic electric platform mostly adopts semi-closed loop digital control, whose basic transmission form of the key components adopts rotary motor and trapezoidal screw (ball screw, roller screw), manufacturing precision and mechanical transmissions inevitably have assembly errors, pitch errors and gap errors. It is necessary to perform error analysis and compensation for high-precision electric cylinder platforms. In this paper, the above errors are further subdivided into linear error, nonlinear error, gap error, which is corresponded error measurement and compensation. The results show that the linear deviation of the measured position and deviation data of the forward and reverse strokes are linearly fitted by the least squares linear fitting method, and then the linear error compensation is performed by adjusting the command pulse amount. The average value of the linear proportional coefficient is taken as the average gap, and the gap error compensation is performed. After the cubic spline interpolation using as the nonlinear error compensation, which accords to GB/T17421.2-2000, the general rule of machine tool inspection Part 2: “the positioning accuracy of the numerical control axis and the determination of repeated positioning accuracy” calculated that the bidirectional positioning accuracy of the electric cylinder is increased from 0.1028 mm to 0.0245 mm, the bidirectional repeat positioning accuracy of the axis is increased from 0.0783 mm to 0.0249 mm, and the maximum backlash is reduced from 0.201 mm to 0.092 mm. These all meet the requirements of positioning accuracy and repeat positioning accuracy of 0.01 mm.


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