Browse > Article
http://dx.doi.org/10.3795/KSME-A.2005.29.2.311

Measurement and Analysis for Positioning Control Characteristics using Encoder Signal of NC Machine Controller  

Kim Jong-Gil (충북대학교 대학원 기계공학부)
Lee Eung-Suk (충북대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.2, 2005 , pp. 311-317 More about this Journal
Abstract
NC controller parameters are fixed when the controller is combined with a machine. However, the characteristics of controller could be changed as it has being used by the machine or other environmental conditions. Ultimately, it results in tool positioning accuracy changing. The loading torque in servo motor also influences on the positioning accuracy. This study focus on a measuring and analysing method for verifying the angular positioning accuracy of NC servo motor. We used a high resolution A/D converter for acquiring analogue signal of rotary encoder in servo motor. Generating tool path by the combination of axial movements (X,Y,Z) is compared with the encoder signals with the servo motor torque. The current variation signal is also read from the servo motor power using a hall sensor and converted to the motor torque. The method of analysing proposed in this study will be used for determining the gains (tuning) of parameter in NC controller, when the controller is set up at a machine initially or the controller condition is changed during the work.
Keywords
Encoder; Hall Sensor; Interpolation; NC Controller; Positioning Control Error; Velocity Gain; Time Constant;
Citations & Related Records
연도 인용수 순위
  • Reference
1 FUNUC AC Servo Motor Digital Series, 1999, Specifications (FUNUC LTD) - CNC Machine Parameters Manual, KSNC
2 Chetwynd, D.G. and Phillipson, P.H., 1980, 'An Investigation of Reference Criteria Used In Roundness Measurement,' The Institute of Physics, pp. 531-538   DOI   ScienceOn
3 Lee, E.S. and Kim, J.G., 2000, 'A study on Minimum Zone Algorithm for Calculation of Roundness,' KSPE, No. 17, Vol. 7
4 Bolinger, John. G. and Duffie, Neil A., 1988, 'Computer Control of Machines and Processes,' Addison-Wesley Publishing Company, pp 314-368
5 Lee, Y.H., 1998, 'Feedrate Regulation Base on Cutting Force Model in 3-Axis Millinf Prosess,' Post-Graduate School, SNU