Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Position Control of Linear Motor by Using Enhanced Cross-Coupling Algorithm

개선된 교차축 연동제어기를 이용한 리니어 모터의 위치제어

  • Han, Sang-Oh (School of Mechanical Engineering Hanyang Univ.) ;
  • Huh, Kun-Soo (School of Mechanical Engineering Hanyang Univ.)
  • Published : 2010.03.01
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Abstract

Linear motors are easily affected by load disturbances, force ripples, friction, and parameter variations because there are no mechanical transmissions that can reduce the effects of model uncertainties and external disturbance. In this study, a nonlinear adaptive controller to achieve high-speed/high-accuracy position control of a two-axis linear motor is designed. The operation of this controller is based on a cross-coupling algorithm. Nonlinear effects such as friction and force ripples are estimated and compensated for. An enhanced cross-coupling algorithm is proposed for effectively improving the biaxial contour accuracy while achieving closed-loop stability. The proposed controller is evaluated by performing computer simulations.

리니어 모터는 동력전달장치가 필요 없는 직접구동 방식으로 접촉 식의 비선형 효과를 크게 줄일 수 있고 구조 또한 간단하다. 그러나 리니어 모터는 동력전달장치를 제거함으로 인해 파라미터 변화와 외란 등에 둔감한 동력전달장치의 장점을 잃게 되어 모델의 불확실성이나 외란에 민감할 뿐만 아니라 마찰과 리플의 특성에 쉽게 영향을 받는다. 본 논문은 리니어 모터의 두 축을 대상으로 위치제어에 악영향을 주는 대표적인 비선형 함수인 마찰력과 리플력을 추정하여 이를 보상하며 개선된 교차 축 연동제어기를 통해 축 간의 윤곽정밀도를 향상시켰다. 기존의 연구된 제어기들은 위치추종과 윤곽추종을 위해 개별적인 제어기를 설계하였으나 제안된 제어기는 하나의 안정한 제어기로 두 축의 위치정밀도와 윤곽정밀도를 동시에 향상시켰다. 제안된 비선형 적응제어기는 모의실험을 통하여 기존의 제안된 교차 축 연동제어기와 비교검증을 함으로써 제안된 제어시스템의 성능을 검증하였다.

Keywords

References

  1. Tan, K. K., Huang, S. N. and Lee, T. H., 2002, “Robust Adaptive Numerical Compensation for Friction and Force Ripple in Permanent-Magnet Linear Motor,” IEEE Transactions on Magnetics, Vol. 38, No.1, pp. 221-228. https://doi.org/10.1109/20.990111
  2. Yao, B. and Xu, L., 2002, “Adaptive Robust Motion Control of Linear Motors for Precision Manufacturing,” Mechatronics, Vol. 12, pp. 595-616. https://doi.org/10.1016/S0957-4158(01)00008-3
  3. Kim, H. B., Lee, B. H. and Huh, K. S, 2005, “Nonlinear Adaptive Control for Linear Motor Through the Estimated Friction Force and Force Ripple,” KSME International Journal, No.05S201, pp.1144-1149.
  4. Huh. K., Han. S. and Lee. B., 2008, “NonlinearAdaptive Control of a Linear-Motor-Driven X-Y Table viaEstimating Friction and Ripple Forces,” Proceedings of theInstitution of Mechanical Engineers, Part C, Journal ofMechanical Engineering Science, Vol. 222, pp. 911-918. https://doi.org/10.1243/09544062JMES859
  5. Koren, Y., 1980, “Cross-coupled Biaxial Computer Control for Manufacturing System,” ASME Journal of Dynamic Systems, Measurement, and, Control, Vol. 120, No. 4, pp. 265-272.
  6. Koren, Y. and Lo, C. C., 1992, “Variable-gain Cross- Coupling Controller for Contouring,” Annals of the CIRP, Vol. 40, No. 1, pp. 371-374. https://doi.org/10.1016/S0007-8506(07)62009-5
  7. Yeh, S. S. and Hsu, P. L, 2000, “A New Approach toBiaxial Cross-coupled Control,” Proceeding of the 2000IEEE, 0-7803-6562-3, pp. 168-173.
  8. Kulkarni, P. K. and Srinivasan, K.,1989, “Optimal Contouring Control of Multi-Axial Drive Servomechanisms,” ASME Journal of Engineering for Industry, Vol. 111, No. 2, pp. 140-148. https://doi.org/10.1115/1.3188743
  9. Shen, S. L., Liu, H. L., and Ting, S. C., 2002, “Contouring Control of Biaxial Systems Based on Polar Coordinates,” IEEE/ASME Transactions on Mechatronics, Vol. 7, No. 3, pp. 329-345. https://doi.org/10.1109/TMECH.2002.802723
  10. Pillay, P. and Krishnan, R., 1989, “Modeling, Simulation, and Analysis of Permanent Magnet Motor Drives, Part 1: The Permanent Magnet Synchronous Motor Drive,” IEEE Transactions on Industry Applications, Vol. 25, No. 2, pp. 189-196.