A new robust speed-sensorless control strategy for high-performance brushless DC motor drives with reduced torque ripple

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• 作者：S.A.KH. Mozaffari Niapour ; M. Tabarraie ; M.R. Feyzi
• 关键词：H&infin ; deconvolution filter ; Brushless dc (BLDC) motor ; Sensorless control ; High-performance drive ; Torque ripple
• 刊名：Control Engineering Practice
• 出版年：March, 2014
• 年：2014
• 卷：24
• 期：Complete
• 页码：42-54
• 全文大小：1416 K

文摘

This paper presents an analysis, design, and strategy of a high-performance speed-sensorless control scheme for estimating the phase-to-phase trapezoidal back-EMF of BLDC motor drive by means of a novel stochastic deconvolution technique in the H_鈭?/em> setting, named robust stochastic H_鈭?/em> deconvolution filter. In the proposed method, unlike the conventional observer-based approaches, the back-EMF is considered as an unknown input, and no need is felt for the constancy assumption of the rotor position and speed of machine within a short period of the time in the modeling of the BLDC motor which leads to ignoring the back-EMF dynamic at high and variable speed. In addition, since high-speed operation is vital for the motor, an improved approach has also been proposed to reduce the commutation-torque-ripple at high-speed for direct torque control (DTC) strategy of three-phase BLDC motor with 120掳 conduction mode in parallel with the proposed method due to the fact that drive performance intensely downgrades in this mode.