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Open-loop behaviour of back-EMF based self-sensing BLDC drives

Frederik De Belie (UGent) , Araz Darba (UGent) and Jan Melkebeek (UGent)
Author
Organization
Project
B/12874/01 - IUAPVII/43
Project
FWO Project G.0083.13N
Abstract
In brushless dc machines the current commutation between phases is triggered based on information of the permanent-magnet flux position. In most BLDC drives, either sensors are used to detect this flux position or a self-sensing algorithm is applied to estimate the flux position instead. Over the last decades, different techniques have been developed to detect the current commutation instants from the speed-induced back-emf signal. Several of these methods when used in open-loop speed control show speed variations at an increasing acceleration. These speed variations are often reduced by closing the speed control loop that adapts the current amplitude to generate a torque for stable speed operation. This paper studies the open-loop behaviour of back-emf based self-sensing BLDC drives and gives a criterium for which the average speed acceleration over a time period is zero. The criterium depends on the machine inertia, speed and torque and indicates the robustness of the self-sensing method against speed variations. Fulfilling the criterium reduces the burden on the speed-controller to guarantee stable speed operation. Even in the ideal case where noise on the measured back-emf is absent and small voltages can be measured accurately, the application of a self-sensing method can be hampered due to a lack of robustness against speed variations if not well-designed.
Keywords
Open Loop Systems, Sensorless Control, Machines, Brushless

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Citation

Please use this url to cite or link to this publication:

Chicago
De Belie, Frederik, Araz Darba, and Jan Melkebeek. 2015. “Open-loop Behaviour of back-EMF Based Self-sensing BLDC Drives.” In IEEE Industrial Electronics Society, 1200–1204. IEEE.
APA
De Belie, F., Darba, A., & Melkebeek, J. (2015). Open-loop behaviour of back-EMF based self-sensing BLDC drives. IEEE Industrial Electronics Society (pp. 1200–1204). Presented at the 41st Annual Conference of the IEEE Industrial Electronics Society (IECON 2015), IEEE.
Vancouver
1.
De Belie F, Darba A, Melkebeek J. Open-loop behaviour of back-EMF based self-sensing BLDC drives. IEEE Industrial Electronics Society. IEEE; 2015. p. 1200–4.
MLA
De Belie, Frederik, Araz Darba, and Jan Melkebeek. “Open-loop Behaviour of back-EMF Based Self-sensing BLDC Drives.” IEEE Industrial Electronics Society. IEEE, 2015. 1200–1204. Print.
@inproceedings{7061988,
  abstract     = {In brushless dc machines the current commutation between phases is triggered based on information of the permanent-magnet flux position. In most BLDC drives, either sensors are used to detect this flux position or a self-sensing algorithm is applied to estimate the flux position instead. Over the last decades, different techniques have been developed to detect the current commutation instants from the speed-induced back-emf signal. Several of these methods when used in open-loop speed control show speed variations at an increasing acceleration. These speed variations are often reduced by closing the speed control loop that adapts the current amplitude to generate a torque for stable speed operation. This paper studies the open-loop behaviour of back-emf based self-sensing BLDC drives and gives a criterium for which the average speed acceleration over a time period is zero. The criterium depends on the machine inertia, speed and torque and indicates the robustness of the self-sensing method against speed variations. Fulfilling the criterium reduces the burden on the speed-controller to guarantee stable speed operation. Even in the ideal case where noise on the measured back-emf is absent and small voltages can be measured accurately, the application of a self-sensing method can be hampered due to a lack of robustness against speed variations if not well-designed.},
  author       = {De Belie, Frederik and Darba, Araz and Melkebeek, Jan},
  booktitle    = {IEEE Industrial Electronics Society},
  isbn         = {978-1-4799-1762-4},
  issn         = {1553-572X},
  keywords     = {Open Loop Systems,Sensorless Control,Machines,Brushless},
  language     = {eng},
  location     = {Yokohama, Japan},
  pages        = {1200--1204},
  publisher    = {IEEE},
  title        = {Open-loop behaviour of back-EMF based self-sensing BLDC drives},
  url          = {http://dx.doi.org/10.1109/IECON.2015.7392263},
  year         = {2015},
}

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