Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Title: I-f Starting Method For Smooth And Fast Transition To Sensorless Field Oriented Control Of Bldc Motors

Keywords: brushless DC motor, I-f starting, PM motor drives, sensorless vector control, variable speed drives

Abstract

This paper proposes an I-f starting method for smooth and fast transition from open- loop frequency control to sensorless field oriented control (FOC) of BLDC motors. The method is divided in three stages: (i) initially the rotor is aligned with a desired angular position; (ii) then, the stator currents are controlled in an arbitrary reference frame to impose the angular frequency of the rotating magnetic field with a suitable profile; (iii) finally, a smooth transition between the arbitrary and the rotor reference frames is accomplished by recalculating the current controller states and references. The proposed method preserves the electromagnetic torque magnitude during the transition avoiding undesired transients. In addition, a procedure based on mechanical model is described to determine a suitable ramp profile. Moreover, the estimated rotor position that is required for FOC as well as for the proposed method is computed by using the estimated back-EMFs from a Luenberger observer. The good performance and robustness under no-load and full load conditions of the proposed starting method are demonstrated by simulation and experimental results.

[1] A. Rahman. History of interior permanent magnet motors. IEEE Industry Applications Magazine, 19(1):10–15, January/February 2013. https://doi.org/10.1109/MIAS.2012.2221996
[2] R. Krishnan. Permanent Magnet Synchronous and Brushless DC Motor Drives. CRC Press, United States of America, 2009.
[3] P. P Acarnley and J. F. Watson. Review of position sensorless operation of brushless permanent-magnet machines. IEEE Transactions on Industrial Electronics, 53(2):352–362, April 2006. https://doi.org/10.1109/TIE.2006.870868
[4] O. Benjak and D. Gerling. Review of position estimation methods for ipmsm drives without a position sensor part i – nonadaptive methods. In Proc. of ICEM, pages 1–6, 2010. https://doi.org/10.1109/ICELMACH.2010.5607978
[5] O. Benjak and D. Gerling. Review of position estimation methods for ipmsm drives without a position sensor part ii – adaptive methods. In Proc. of ICEM, pages 1–6, 2010. https://doi.org/10.1109/ICELMACH.2010.5607980
[6] O. Benjak and D. Gerling. Review of position estimation methods for pmsm drives without a position sensor, part iii – methods based on saliency and signal injection. In Proc. of ICEM, pages 873–878, 2010.
[7] Z. Wang, K. Lu, and F. Blaabjerg. A simple startup strategy based on current regulation for back-emf-based sensorless control of pmsm. IEEE Transactions on Power Electronics, 27(8):3817–3825, August 2012. https://doi.org/10.1109/TPEL.2012.2186464
[8] R. Wu and G. R. Slemon. A permanent magnet motor drive without a shaft sensor. IEEE Transactions on Industry Applications, 27(5):1005–1011, September/ October 1991. https://doi.org/10.1109/28.90359
[9] S. Ogasawara and H. Akagi. An approach to position sensorless drive for brushless dc motors. IEEE Transactions on Industry Applications, 27(5):928–933, September/October 1991. https://doi.org/10.1109/28.90349
[10] J. Qi, Tian y., Gong Y., Zhu C., and Zhao X. A new start method for rolling piston compressor based on dsp to improve the load performance. In Proc. of ICAL, pages 543–548, 2009. https://doi.org/10.1109/ICAL.2009.5262864
[11] K.-W. Lee, D-K Kim, B-T Kim, and B-I Kwon. A novel starting method of the surface permanent-magnet bldc motors without position sensor for reciprocating compressor. IEEE Transactions on Industry Applications, 44(1):85–92, January/February 2008. https://doi.org/10.1109/TIA.2007.912734
[12] C. L. Baratieri and H. Pinheiro. A novel starting method for sensorless brushless dc motors with current limitation. In Proc. of ICEM, pages 816–822, 2012. https://doi.org/10.1109/ICElMach.2012.6349971
[13] G. H. Jang, J. H. Park, and J. H. Chang. Position detection and start-up algorithm of a rotor in a sensorless bldc motor utilising inductance variation. IEE Proc.-Electric Power Applications, 149(2):137–142, March 2002. https://doi.org/10.1049/ip-epa:20020022
[14] F. Briz and M. W. Degner. Rotor position estimation. IEEE Industrial Electronics Magazine, 5(2):24–36, June 2011. https://doi.org/10.1109/MIE.2011.941118
[15] M. Fatu, R. Teodorescu, I. Boldea, G. Andreescu, and F. Blaabjerg. I-f starting method with smooth transition to emf based motion-sensorless vector control of pm synchronous motor-generator. In Proc. of PESC, pages 1481–1487, 2008. https://doi.org/10.1109/PESC.2008.4592146
[16] A. Stirban, I. Boldea, and G.-D. Andreescu. Motion-sensorless control of bldc-pm motor with offline fem information-assisted position and speed observer. IEEE Transactions on Industry Applications, 48(6):1950– 1958, November/December 2012. https://doi.org/10.1109/TIA.2012.2226194