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http://dx.doi.org/10.6113/JPE.2018.18.4.1086

Filterless and Sensorless Commutation Method for BLDC Motors  

Rad, Shahin Mahdiyoun (Department of Electrical Engineering, Sahand University of Technology)
Azizian, Mohammad Reza (Department of Electrical Engineering, Sahand University of Technology)
Publication Information
Journal of Power Electronics / v.18, no.4, 2018 , pp. 1086-1098 More about this Journal
Abstract
This study presents a new sensorless commutation method for brushless direct current motors to replace Hall sensor signals with virtual Hall signals. The importance of the proposed method lies in the simultaneous elimination of the phase shifter and the low-pass filters, which makes the method simple and cost-effective. The method removes high ripple switching noises from motor terminals, thereby decreasing motor losses. The proposed method utilizes unfiltered line voltages with notches caused by current commutation. Hence, specific sign signals are defined to compensate for the effects of commutation noise. The proposed method is free from phase delay that originates from low-pass filters. The method directly produces virtual Hall signals, and thus, it can be interfaced with low-cost commercial commutation integrated circuits based on Hall sensors. Simulation and experimental results show the effectiveness and validity of the proposed method.
Keywords
Brushless DC motor; Current commutation; Filterless; Rotor position detection; Sensorless;
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