Control Of DC Machine Research Articles

Sensorless Speed/Torque Control of DC Machine Using Artificial Neural Network Technique

In this paper, Artificial Neural Network (ANN) technique is implemented to improve speed and torque control of a separately excited DC machine drive. The speed and torque sensorless scheme based on ANN is estimated adaptively. The proposed controller is designed to estimate rotor speed and mechanical load torque as a Model Reference Adaptive System (MRAS) method for DC machine. The DC drive system consists of four quadrant DC/DC chopper with MOSFET transistors, ANN, logic gates and routing circuits. The DC drive circuit is designed, evaluated and modeled by Matlab/Simulink in the forward and reverse operation modes as a motor and generator, respectively. The DC drive system is simulated at different speed values (±1200 rpm) and mechanical torque (±7 N.m) in steady state and dynamic conditions. The simulation results illustrate the effectiveness of the proposed controller without speed or torque sensors.

Advanced Electrical Drives Analysis, Modeling, Control [Book News

This book is a long-expected second part of the original textbook. It covers the following topics: Modern Electrical Drives; Modulation Techniques for Power Electronic Converters; Current Control of Generalized Load; Drive Principles"; Modeling and Control of DC Machines; Synchronous Machine “Modeling Concepts; Control of Synchronous Machine Drives; Induction Machine Modeling Concepts; Control of Induction Machine Drives; and Switched Reluctance Drive Systems.

High performance DC motor drive using a PWM rectifier with power transistors

This work presents a new rectifier connected in the bridge configuration, which uses six bidirectional switches to connect the 3-phase source to the load. Each bidirectional switch comprises two power MOSFET transistors working in the switching mode. A simple pulse-width modulation strategy is developed using the ficticious source concept. The convertor works at a high switching frequency and for this reason it does not need large storage elements. In addition, the simple control strategy and the high controllability of the power elements produce a dramatic simplification of the control and logic circuits. The convertor accepts regenerative power and for this reason it is well suited for use in the 4-quadrant speed control of DC machines. The performance of the convertor was experimentally investigated in the speed control of a 0.6 kW DC servomotor.

A Simple Bilateral Variable-Ratio dc Pulse Converter

A very simple and economical circuit is presented which functions as a bilateral variable-ratio direct voltage transformer.The circuit, which consists essentially of two thyristors, two diodes, and an inductance, is a modification of the familiar pulse converter. When used for the controlof dc machines, dynamic braking is accomplished automatically by feedback of power to the supply. Furthermore, the armature circuit of the machine may provide sufficient inductance for satisfactory operation. Factors which influence the efficiency and the selection of circuit parameters such as operating frequency, component ratings, and the magnitude of the circuit inductance are investigated. The problem of obtaining safe and economical commutation of the thyristors is to be dealt with in a subsequent paper. Test results from an experimental circuit are presented.