IJPEM

Separation of All Motion Errors in a Rotary Motor Using Dual Rotary Encoders

Tsung-Han Hsieh/Industrial Technology Research Institute

Keywords : Rotary motor Motion errors Error separation Rotary encoders Optical sensors
This paper proposes the use of dual rotary encoders to measure all motion errors on a rotary motor. In this configuration, rotary encoders and optical sensors were installed on the rotary motor during the experiment. All optical sensors measured the rotational angle during rotation, enabling the separation of the all motion errors using the proposed method. One rotary encoder is positioned at a reference height, while another is at a specific height. Each rotary encoder is equipped with three optical sensors, respectively. The measured rotational angle allows for the separation of one angular and two radial motion errors. Additionally, two tilt motion errors are analyzed using the measured radial motion errors at the specific height. Three optical sensors detect the axial motion error at a specific height. In total, all motion errors are analyzed for the rotary motor. A polygon-autocollimator was employed to verify the angular positioning motion error, with the maximum En values obtained being 0.26. The two radial and axial motion errors were verified using a linear variable differential transformer, with the maximum En values obtained being 0.36, 0.31, and 0.19, respectively. These En values indicate that the proposed method using dual rotary encoders is practical.