Private Research Laboratory

Shīrāz, Iran

Private Research Laboratory

Shīrāz, Iran

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Mozaffari Niapour S.A.K.,University of Illinois at Chicago | Shokri Garjan G.,Private Research Laboratory | Feyzi M.R.,University of Tabriz | Danyali S.,Ilam University | Bahrami Kouhshahi M.,University of North Carolina at Charlotte
International Review of Electrical Engineering | Year: 2014

Brushless DC (BLDC) motors and their drives have been increasingly considered in a broad range of applications due to their significant features. The implementation of these motors is possible thanks to firstly, the progress of permanent-magnet (PM) technologies which provide high efficiency, power density, and torque for these motors. Secondly, the structure and special features of these motors have prepared a basis for simpler control and smaller size compared to those with the same power. In this paper, the basic drives of BLDC motors have been reviewed in order to provide a useful reference for primary research in conventional methods of these types of motors. To present a proper insight to various drive techniques in these motors a systematic classification to control strategies with principles of these techniques has been made. In addition, computer simulations have been utilized in order to achieve a more accurate evaluation, provide the possibility of comparative analysis between various strategies, and place emphasis on the constraints and features of each method. Apart from the comparison of different methods of each strategy, a general comparison among the different methods of various strategies has been made based on the torque ripple, analysis of frequency, and losses of the BLDC motor drive as well as various applications of the different controlling methods. Moreover, considering the importance of electric vehicles (EVs) in industry, selection of the best controlling method for this type of applications together with energy regeneration has been discussed. © 2014 Praise Worthy Prize S.r.l. All rights reserved.


Mozaffari Niapour S.A.K.H.,Private Research Laboratory | Tabarraie M.,Private Research Laboratory | Feyzi M.R.,University of Tabriz
Control Engineering Practice | Year: 2014

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∞ setting, named robust stochastic H∞ 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° conduction mode in parallel with the proposed method due to the fact that drive performance intensely downgrades in this mode. © 2013 Elsevier Ltd.


The problem of stationary robust L∞-induced deconvolution filtering for the uncertain continuous-time linear stochastic systems is addressed. The state space model of the system contains state- and input-dependent noise and deterministic parameter uncertainties residing in a given polytope. In the presence of input-dependent noise, we extend the derived Lemma in [22] characterizing the induced L∞ norm by linear matrix inequalities (LMIs), according to which we solve the deconvolution problem in the quadratic framework. By decoupling product terms between the Lyapunov matrix and system matrices, an improved version of the proposed L∞-induced norm bound Lemma for continuous-time stochastic systems is obtained, which allows us to realize exploit parameter-dependent stability idea in the deconvolution filter design. The theories presented are utilized for sensor fault reconstruction in uncertain linear stochastic systems. The effectiveness and advantages of the proposed design methods are shown via two numerical examples. © 2012 Elsevier B.V. All rights reserved.


Mozaffari Niapour S.A.Kh.,Private Research Laboratory | Tabarraie M.,Private Research Laboratory | Feyzi M.R.,University of Tabriz
Energy Conversion and Management | Year: 2012

This paper aims to present an analysis and design of a high-performance speed-sensorless control scheme for a three-phase brushless DC (BLDC) motor drive by means of a novel observer technique in the induced L∞ norm setting, named robust stochastic L∞-induced observer, with the purpose of reducing torque ripple and increasing system robustness. The proposed observer is used for estimating the phase-to-phase trapezoidal back-electromotive-force (back-EMF) for the BLDC motor merely via utilizing measured line stator currents and voltages in such a way that by estimating the back-EMF, position and speed of the rotor is readily obtained. In contrast to the conventional back-EMF sensing methods, this strategy of utilized drive requires no filtering of current and voltage; furthermore, it does not suffer from any sensitivity to switching noises. Owing to that high-speed operation is vital for a motor, the varying input voltage method is used for realizing the minimization of commutation-torque-ripple in a parallel way to the proposed method since drive performance intensely degrades in this mode. Apart from analytic investigation of the proposed method, two other types of observers, namely, the sliding-mode observer and Kalman filter are compared with the proposed method for the aim of determining steady-state accuracy, dynamic performance, parameter and noise sensitivity, low-speed-operation performance, and computational complexity. Finally, the proposed system has been simulated in different operating conditions of the BLDC motor by computer simulation, and the effects of the proposed speed-sensorless control scheme has been assessed by comparative studies and simulation results. Simulation results authenticate that the proposed method is of excellent robustness and high precision estimation in comparison with sliding-mode and Kalman filter methods under different operating conditions in spite of the existence of measurement noise and electric parameter uncertainty. Therefore, the proposed method with its strong robustness makes it possible for the drive to enable the motor to undergo a stable tensionless operation without facing any problem at high-and low-speeds. © 2012 Elsevier Ltd. All rights reserved.

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