2 edition of Direct torque control of brushless doubly fed reluctance machines found in the catalog.
Direct torque control of brushless doubly fed reluctance machines
Written in English
|Series||Theses (Northumbria University)|
Direct Torque Control Technique for Voltage Source Inverter controller imposes the time duration of the active voltage vectors, which move the stator flux along the reference trajectory, and the torque controller determinates the time duration of the zero voltage vectors which keep the motor torque in the predefined hysteresis tolerance band. Due to the good performance of brushless motor, its application is widespread. Brushless DC motor has following advantages that are low interference, low noise, high efficiency and so on, so it was widely used in industrial and control field. But DC motor has larger current commutation torque ripple, greatly reduce their reliability and stability.
This paper presents the control strategies for a novel dual-stator flux-modulated (DSFM) motor for application in electric vehicles (EVs). The DSFM motor can be applied to EVs because of its simple winding structure, high reliability, and its use of two stators and rotating modulation steels in the air gap. Moreover, it outperforms conventional brushless doubly-fed machines in terms of control. Abstract—In this paper, a direct torque control (DTC) technique for brushless dc (BLDC) motors several distinct advantages such as high power density, high with non-sinusoidal back-EMF operating in the constant torque region is presented.
Effectiveness of active noise and vibration cancellation of switched reluctance machines under alternative control strategies. Long, S. A. / Zhu, Z. Q A novel load current feedforward control for direct torque control based AC-DC-AC converters. Pollanen, R. / Tarkiainen, A Brushless doubly-fed asynchronous generator for variable speed. Direct Torque Control for Doubly Fed Induction Machine-Based Wind Turbines Under Voltage Dips and Without Crowbar Protection PowerPoint Presentation: Abstract: This paper proposes a rotor flux amplitude reference generation strategy for doubly fed induction machine based wind turbines.
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Abstract: Direct Torque Control (DTC) method is an excellent technique for torque and flux control for a brushless doubly-fed reluctance machine (BDFRM).
The advantages of the DTC method are simple implementation, fast response and little dependence on the machine parameters. However, the conventional DTC method has high torque and flux ripple and variable switching frequency by: 8. Direct Torque Control (DTC) method is an excellent technique for torque and flux control for a brushless doubly-fed reluctance machine (BDFRM).
Improved Direct Torque Control Method of Brushless Doubly-Fed Reluctance Machines for Wind Turbine. Direct torque control for brushless doubly-fed machines Abstract: Work has illustrated the potential benefits of brushless doubly-fed machines in adjustable speed drive applications.
While it has been shown that the drive is open-loop stable over a wide speed range, the resultant steady-state and dynamic performance characteristics are far from. In this paper, a direct torque control (DTC) strategy for the brushless doubly fed machine (BDFM) is presented.
After analyzing the mathematical model of this machine, the voltage vectors look-up table of classical DTC techniques is by: Direct torque control (DTC) is one method used in variable-frequency drives to control the torque (and thus finally the speed) of three-phase AC electric involves calculating an estimate of the motor's magnetic flux and torque based on the measured voltage and current of the motor.
Direct Torque Control (DTC) has been extensively researched and applied to most AC machines during the last two decades.
Its first application to the Brushless Doubly-Fed Reluctance Machine (BDFRM. A new algorithm for independent shaft position sensor-less control of real and reactive power (and therefore power factor) of the Brushless Doubly-Fed Reluctance Machine (BDFRM), a promising cost-effective candidate for applications with limited variable speed capability (e.g.
pumps or wind turbines), has been proposed in this paper. The algorithm is inspired by the fundamental dynamic and. This book presents the modeling, performance, design, and control of reluctance synchronous and flux-modulation machines developed for higher efficiency and lower cost.
It covers one- and three-phase reluctance synchronous motors in line-start applications and various reluctance flux-modulation motors in pulse width modulation converter-fed. The brushless doubly-fed reluctance machine (BDFRM) has been considered by academic and industrial communities as a potential alternative to conventional doubly-excited wound rotor induction machines (DEWRIM) in variable speed applications with limited speed ranges such as large pumps and wind turbines.
While offering similar cost benefits, afforded by the use of partially-rated power. Doubly fed electric machines are electric motors or electric generators that have windings on both stationary and rotating parts, where both windings transfer significant active power between shaft and electrical system.
Usually the stator winding is directly connected to the three-phase grid and the three-phase rotor winding is fed from the grid through a rotating or static frequency converter. Improved Direct Torque Control of a Brushless Doubly-Fed Reluctance Machine William K Song Supervisor: Prof.
DavidGDorrell (particularly in traction motors) but other machines include brushless permanent magnet machines (high eﬃciency machines, and with the use of high energy rare. Reluctance torque is the torque generated because the motor is moving to a position where the reluctance seen by the armature flux is declining.
A simple application of this principle is the refrigerator magnet, which is held in place by reluctance force. Because the reluctance along the path of the magnet flux is minimized when the magnet is as close as possible to (in contact with) the.
The Brushless Doubly-Fed Machine (BDFM) has recently become an important research topic in the field of variable-speed AC drives. In recent studies, the BDFM has shown significant potential for improving the reliability and performance of AC drive systems, as well as reducing total system cost.
Doubly-fed electric machines also slip-ring generators are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine.
By feeding adjustable frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. algorithm for brushless doubly-fed machines has been developed for reducing the torque and flux ripples in a brushless doubly-fed machine.
This method based on 48 fixed synthesizing vectors is implemented in the brushless doubly-fed machine. Compared with the. Jovanovic MG, Yu J, Levi E () Encoderless direct torque controller for limited speed range applications of brushless doubly fed reluctance motors.
IEEE. Abstract—Direct torque control (DTC) of three phase brushless DC Motor (BLDC Motor) using PI Controller. Speed performance is also improved when there is B4 inverter. Reconstruction of inverter design from six switches to four switch, which will reduce the torque ripples.
Thus, Brushless. Ademi S, Jovanovic M, Obichere JK () Comparative analysis of control strategies for large doubly-fed reluctance wind generators.
Lecture notes in engineering and computer science: proceedings of the world congress on engineering and computer scienceWCECSpp –, San Francisco, USA, 22–24 Oct Google Scholar. Direct Torque Control for Brushless Doubly-Fed Machine Based on Fuzzy-PI Regulator p New Implementation of Position Sensorless Control Based on the AC Component of SNP for Brushless DC Motor Torque ripple minimization strategy for the direct torque control of brushless doubly-fed machine [J].
Electric machines and control,10 (6. Reluctance electric machines: design and control. Circuit Modeling with Finite-Element Model Validation Control of Brushless Doubly-Fed Reluctance Machines Practical Design Issues SummaryReferencesChapter 9 Switched Flux-Permanent Magnet Synchronous Motor Analysis, Design, and Control Introduction The Nature of Switched Flux.Brushless doubly-fed motor (BDFM) has well applicable potentials in the speed control driving field due to its excellent speed regulation performance.
However, the poor starting performance becomes a shortage that still limits the development and application of wound BDFM. To solve the problem, this paper presents a novel BDFM adopted rotor winding based on the principle of the composite coil.Includes information on recently introduced reluctance flux-modulation electric machines (switched- flux, flux-reversal, Vernier, transverse flux, claw pole, magnetic-geared dual-rotor, brushless doubly fed, etc.).
Features numerous examples and case studies throughout. Provides a comprehensive overview of all reluctance electric machines.