전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제24권1호
  • /
  • Pages.25-32
  • /
  • 2019
  • /
  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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트레드밀에 사용되는 3상 유도전동기의 슬립 기반 센서리스 제어 저속성능 향상

Low-Speed Performance Improvement of Slip Based Sensorless Control for Three-Phase Induction Motor Used in Treadmill

  • Lee, Su-Hyoung (Dept. of Electrical Eng., Incheon National University) ;
  • Lee, Sang-Hee (Dept. of Electrical Eng., Incheon National University) ;
  • Mun, Tae-Yang (Dept. of Electrical Eng., Incheon National University) ;
  • Han, Hee-Min (Dept. of Electrical Eng., Incheon National University) ;
  • Kim, Joohn-Sheok (Dept. of Electrical Eng., Incheon National University)
  • 투고 : 2018.11.02
  • 심사 : 2018.11.08
  • 발행 : 2019.02.20
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초록

Recent high-end treadmills are demanding stable performance at lower speeds. In this study, a slip control-based induction motor sensorless algorithm for treadmills, which have heavy load variations, is proposed. A modified Gopinath flux estimator is used to evaluate the rotor flux. Results indicate that a good speed regulation performance is achieved even at a low speed of approximately 3 Hz with a nominal exercise load of 90 kg body weight. The slip calculation method in the stationary coordinate system is adopted to improve the control stability. The proposed algorithm is verified throughout the simulation study using PSIM, and the experimental test consists of a commercial treadmill system.

키워드

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Fig. 1. Slip control-based induction motor sensorless scalar control system.

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Fig. 2. Existing scalar speed feedback control algorithm.

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Fig. 3. Vector control based slip estimator.

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Fig. 4. Sensorless control of induction motor for treadmill system.

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Fig. 5. Voltage controller for treadmill system.

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Fig. 6. Rotor flux in the dr - pr reference frame.

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Fig. 9. Simulation result of the proposed algorithm with 3Hz(90r/min) speed command.

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Fig. 10. Simulation result of the proposed algorithm with 10Hz(300r/min) speed command.

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Fig. 11. Experiment equipments.

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Fig. 12. Experiment results of comparing speed control performance at 90r/min(0.6km/h) speed command. (a) conventional control algorithm. (b) proposed control algorithm.

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Fig. 13. Experiment results of the proposed algorithm at 90r/min(0.6km/h) speed command (to show estimated speed & flux).

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Fig. 14. Experiment results of the proposed algorithm at 300r/min(2km/h) speed command (to show estimated speed & slip, q-axis current).

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Fig. 15. Experiment results of the proposed algorithm at 1300r/min(8.6km/h) speed command (to show estimated speed & flux).

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Fig. 16. Experiment results of the proposed algorithm at 90r/min(0.6km/h) speed command with maximum brake torque (to show estimated speed & flux).

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Fig. 7. The Closed-loop gopinath flux observer.

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Fig. 8. Modified stator flux & slip observer.

TABLE 1 SIMULATION AND EXPERIMENT PARAMETERS

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참고문헌

  1. J. S. Lee, "Modal analysis of treadmill machine," Korea Academia-Industrial cooperation Society, Vol. 7, No. 4, pp. 539-544, 2006.
  2. H. H. Lee and Y. Khojakhan, “New loss minimization vector control for induction motors,” The Transactions of the Korean Institute of Electrical Engineers, Vol. 60, No. 6, pp. 1140-1145, Jun. 2011. https://doi.org/10.5370/KIEE.2011.60.6.1140
  3. P. L. Jasen and R. D. Lorenz, “A physically insightful approach to the design and accuracy assessment of flux observers for field oriented induction machine drives,” IEEE Trans. On Ind. Appl., Vol. 30, No. 1, pp. 101-110, Jan./Feb. 1994. https://doi.org/10.1109/28.273627
  4. C. C. Wang and C. H. Fang, "Sensorless scalar-controlled induction motor drives with modified flux observer," IEEE Transactions on Energy Conversion, Vol. 18, pp. 181-186, May 2003. https://doi.org/10.1109/TEC.2002.805181
  5. S. S. Han, “Slip estimated sensorless vector controller,” JKIICE, Vol. 14, No. 10, pp. 2299-2304, 2011.
  6. G. J. Jo and J. W. Choi, "Realization of voltage model flux observer by using the closed-loop gopinath flux observer of induction motors," Proceedings of the KIEE, pp. 183-186, Oct. 2015.
  7. J. Holtz, "Sensorless control of induction motor drives," Proceedings of the IEEE, Vol. 90, pp. 1359-1394, Aug. 2002. https://doi.org/10.1109/JPROC.2002.800726
  8. Y. H. Park, J. W. Choi, H. G. Kim, J. K. Kim, Y. T. Choi, E. C. Nho, and T. W. Chun, “A study on the characteristics of thyristor controlled shunt compensator,” The Transactions of the Korean Institute of Power Electronics, Vol. 8, No. 4, pp. 299-306, Aug. 2003.