Current Integral Method for Fine Commutation Tuning of Sensorless Brushless DC Motor

An-Chen Lee, Chia Juei Fan, Guan Hong Chen

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


This paper presents a method for fine commutation tuning of brushless direct current (BLDC) motor. First, we analyze the phase current waveform under commutation error and nonideal back-EMF. From the relationship derived, we propose a feedback compensation method in combination with a sensored BLDC motor or any sensorless drive technique to adjust commutation instant by forcing the current integrals of the two half periods in one 60° conducting period to be equal. The method is robust to variations in resistance and inductance, as well as to nonideal back-EMF, pushing the peak values of the current waveform at the front and back of each conducting period to be more identical. Simulations are presented and a digital signal processor (DSP)-based sensorless scheme contingent on a disturbance observer for back electromotive force (back-EMF) estimation in combination with the proposed control method is implemented to verify its effectiveness experimentally. The results show that proposed method is capable of running the motor at different speeds, load torque, and under the speed-varying operating condition with low levels of motor vibration and power consumption.

Original languageEnglish
Article number7815416
Pages (from-to)9249-9266
Number of pages18
JournalIEEE Transactions on Power Electronics
Issue number12
StatePublished - 1 Dec 2017


  • Brushless dc motor
  • commutation error compensation
  • disturbance observer (DOB)
  • nonideal back electromotive force (back-EMF)
  • pulsating current
  • sensorless drive

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