Abstract
The main purpose of this study is to propose a novel back-EMF observer. It can drive a permanent magnet Brushless DC Motor (BLDCM) smoothly from slow to high speed without position or speed sensors. In the method, a phase back-EMF observer, which could estimate phase back-EMFs in real time and only relies on DC voltage and phase currents of motor without an additional circuit or complicated operation process,had been established with phase back-EMF as a disturbance signal. This observer simplifies the structure of traditional back- EMF observers and only has one inertia element, hence the response time and robustness of the system could be improved. This study also detailedly provides a method for speed and position detection, which has high performance in low speed range. The validity of the proposed method is verified through simulation and experimental results.
Highlights
Brushless DC Motor (BLDCM) is widely used in various applications of electromechanical systems because of its high efficiency, high power density and good controllability over a wide range of speed and low maintenance cost due to the removal of the brushes (Wang et al, 2010; Bharatkar and Yanamshetti, 2010; Wang and Liu, 2008)
In order to overcome these shortcomings, it is necessary to combine this method with other control methods to realize the highefficiency operation without position sensor at both low speed and high speed
This study proposes a novel sensorless control i.e., method
Summary
BLDCM is widely used in various applications of electromechanical systems because of its high efficiency, high power density and good controllability over a wide range of speed and low maintenance cost due to the removal of the brushes (Wang et al, 2010; Bharatkar and Yanamshetti, 2010; Wang and Liu, 2008). Current of motor without an additional circuit or complicated operation process,had been established Torque and motion equations are: with phase back-EMF as a disturbance signal. This observer simplifies the structure of traditional back-. EMF observers and only has one inertia element, the response time and robustness of the system could be improved This method shows the basic structural relationship between the change of phase current and phase back-EMF and provides reference for where, Te = Electromagnetic torque Ω = Mechanical angular velocity using other methods (such as PID, self-adaptive or artificial intelligence control) to realize phase backEMF estimation. The results of simulations and experiments show the validity of this algorithm for BLDCM control
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
