I-F Starting Method for Smooth and Fast Transition to Sensorless Field Oriented Control of Bldc Motors

Cassio Luciano Baratieri; Humberto Pinheiro

doi:10.18618/REP.2014.3.268276

Authors

Cassio Luciano Baratieri Federal University of Santa Maria - Santa Maria - RS - Brazil
Humberto Pinheiro Federal University of Santa Maria - Santa Maria - RS - Brazil

DOI:

https://doi.org/10.18618/REP.2014.3.268276

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.

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Author Biographies

Cassio Luciano Baratieri, Federal University of Santa Maria - Santa Maria - RS - Brazil

was born in Erechim, Rio Grande do Sul, Brazil, in 1984. He received the B.S. and M.S. degrees in electrical engineering from the Federal University of Santa Maria, Santa Maria, Brazil, in 2009 and 2011, respectively. Since 2007, he has been a member of the Power Electronics and Control Research Group, Santa Maria, Brazil. Currently, he is a doctoral student of the Graduate Program in Electrical Engineering at the Federal University of Santa Maria. His current research interests include control of electrical machines. M.S. Baratieri is a student member of SOBRAEP and a graduate student member of the IEEE Industry Applications and IEEE Industrial Electronics Societies.

Humberto Pinheiro, Federal University of Santa Maria - Santa Maria - RS - Brazil

was born in Santa Maria, Rio Grande do Sul, Brazil, in 1960. He received the B.S. degree from the Federal University of Santa Maria (UFSM), Santa Maria, in 1983, the M.Eng. degree from the Federal University of Santa Catarina, Florianopolis, Brazil, in 1987, and the Ph.D. degree ´ from Concordia University, Montreal, QC, Canada, in 1999. From 1987 to 1990, he was a Research Engineer with a Brazilian UPS company and then joined the Pontif´ıcia Universidade Catolica do Rio Grande do Sul, Porto Alegre, ´ Brazil, where he lectured on power electronics. Since 1991, he has been with the UFSM. His current research interests include grid connected three-phase converters, wind energy conversion systems, and control applied to power electronics systems. Dr. Pinheiro is a member of SOBRAEP, IEEE Power Electronics Society and IEEE Industrial Electronics Society.

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