DocumentCode :
617003
Title :
Sensorless commutation and speed control of Brushless DC-machine drives based on the back-EMF symmetric threshold-tracking
Author :
Darba, Araz ; De Belie, Frederik ; Melkebeek, Jan
Author_Institution :
Dept. of Electr. Energy, Syst. & Autom., Autom. of Ghent Univ., Ghent, Belgium
fYear :
2013
fDate :
12-15 May 2013
Firstpage :
492
Lastpage :
497
Abstract :
The operation of Brushless DC permanent-magnet machines requires information of the rotor position to steer the semiconductor switches of the power-supply module which is commonly referred to as Brushless Commutation. Different sensorless techniques have been proposed to estimate the rotor position using current and voltage measurements of the machine. Detection of the back-electromotive force (EMF) zero-crossing moments is one of the methods most used to achieve sensorless control by predicting the commutation moments. Most of the techniques based on this phenomenon have the inherit disadvantage of an indirect detection of commutation moments. This is the result of the commutation moment occurring 30 electrical degrees after the zero-crossing of the induced back-emf in the unexcited phase. Often, the time difference between the zero crossing of the back-emf and the optimal current commutation is assumed constant. This assumption can be valid for steady-state operation, however a varying time difference should be taken into account during transient operation of the BLDC machine. This uncertainty degrades the performance of the drive during transients and higher speed. In this paper a new method is proposed to overcome this problem which improves the performance while keeping the simplicity of the back-emf zero-crossing detection method. The proposed sensorless method operates parameterless in a way it uses none of the brushless dc-machine parameters.
Keywords :
DC machines; angular velocity control; brushless machines; electric drives; permanent magnet machines; rotors; semiconductor switches; sensorless machine control; BLDC machine; EMF zero-crossing moment; back-EMF symmetric threshold-tracking; back-EMF zero-crossing detection method; brushless DC permanent magnet machine drives; brushless commutation; commutation moment prediction; current measurement; optimal current commutation; power-supply module; rotor position estimation; semiconductor switches; sensorless commutation control; sensorless technique; speed control; steady-state operation; time difference; transient operation; voltage measurement; Acceleration; Commutation; Delays; Rotors; Torque; Transient analysis; Voltage measurement; Back-EMF zero-crossing; Permanent-magnet Brushless DC-Machine (BLDC-machine); Sensorless Control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electric Machines & Drives Conference (IEMDC), 2013 IEEE International
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4673-4975-8
Electronic_ISBN :
978-1-4673-4973-4
Type :
conf
DOI :
10.1109/IEMDC.2013.6556141
Filename :
6556141
Link To Document :
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