24 November 2016 Study of angle measuring error mechanism caused by rotor run-outs
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In a rotating angle measuring system, errors of grating sensor, installation and rotor run-outs will affect angle measuring error. The error caused by rotor run-outs is usually the biggest and the hardest to eliminate of them. To improve the accuracy, the table should be fabricated precisely, thus, the table system will be complicated and expensive. This paper provides a method to solve the challenge by using two gratings in the same table, whose gratings respectively grooved on end face and side face. The error mechanism of end face and side face caused by axial and radial rotor run-outs by were deduced. It can be concluded from the analysis that end face grating is sensitive when radial rotor run-outs happens, side face grating is sensitive when axial rotor run-outs happens. Due to the conclusion, combined type gratings with one end face grating and one side face grating can be used to restrain the error caused by Rotor Run-outs of table.
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Dabao Lao, Dabao Lao, Wenying Zhang, Wenying Zhang, Weihu Zhou, Weihu Zhou, } "Study of angle measuring error mechanism caused by rotor run-outs", Proc. SPIE 10023, Optical Metrology and Inspection for Industrial Applications IV, 1002328 (24 November 2016); doi: 10.1117/12.2248172; https://doi.org/10.1117/12.2248172

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