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Position Correction Method for Misaligned Hall-Effect Sensor of BLDC Motor using BACK-EMF Estimation

역기전력 추정법을 이용한 브러시리스 직류 전동기의 홀센서 상전류 전환시점 보상 방법

  • Park, Je-Wook (Department of Electric Engineering., Pusan Nat'l Univ.) ;
  • Kim, Jong-Hoon (Dept. of Digital Control, Production engineering research institute, LG Electronics) ;
  • Kim, Jang-Mok (Department of Electric Engineering., Pusan Nat'l Univ.)
  • Received : 2011.10.11
  • Accepted : 2012.02.29
  • Published : 2012.06.20

Abstract

This paper proposes a new position compensation method for misaligned Hall-effect sensors of BLDCM(Brushless DC Motor). If the Hall-effect sensors are installed at wrong position, the exact rotor position cannot be obtained. Therefore, when the BLDCM is controlled with this wrong position, the torque ripple can be increased and the average torque also decreases. The back-EMF of BLDCM can be obtained by using the voltage equation and by multiplying the back-EMF constant and rotor speed. At a constant speed, the estimated back-EMF by using the multiplication of the back-EMF constant and rotor speed is constant, but the estimated back-EMF from the voltage equation decreases at the commutation point because the line-to-line back-EMF of two conducting phases is start to decrease at this point. Therefore, by using the difference between these two estimated back-EMFs, the commutation point of the phase current can be determined and position compensation can be carried out. The proposed position correction method doesn't require additional hardware circuit and can be easily implemented. The validity of the proposed position compensation method is verified through several experiments.

Keywords

References

  1. T. J. E Miller, "Brushless Permanent-Magnet and Reluctance Motor Drives," Oxford, 1989.
  2. J. R. Hendershot and T. J. E. Miller, "Design of Brushless Permanent-Magnet Motors," Oxford, 1994.
  3. T. J. E Miller, "Brushless permanent-Magnet motor drives," Power Engineering Journal, Vol. 2, No. 1, pp. 55-60, 1988. https://doi.org/10.1049/pe:19880010
  4. Sam-Young Kim, Chinchul Choi, Kyeongjin Lee, Wootaik Lee, "An Improved Rotor Position Estimation With Vector-Tracking Observer in PMSM Drives With Low-Resolution Hall-Effect Sensors," Industrial Electronics, IEEE Trans. on, 1984, Vol. 58, No. 9, pp. 4078-4086.
  5. Samoylenko N, Qiang Han, Jatskevich J, "Dynamic Performance of Brushless DC Motors With Unbalanced Hall Sensors," Energy Conversion, IEEE Transactions on, 2008, Vol. 23, No. 3, pp. 752-763. https://doi.org/10.1109/TEC.2008.921555
  6. Tae Hyung kim, Ehsani M, "An error analysis of the sensorless position estimation for BLDC motors," Industry Applications Conference, 2003. 38th IAS Annual Meeting. Conference Record of the, vol1, pp. 611-617.
  7. Seung-Ki Sul, "Control of Electric Machine Drive Systems," WILEY, 2010.

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