PROBLEMS OF CONSTRUCTION OF ASYNCHRONOUS ELECTRIC DRIVES WITH STATE OBSERVERS

This paper considers the problems of constructing asynchronous electric drives with state observers and the latest advances in the field of sensorless alternating current drives. The main areas of application of asynchronous electric drives with state observers are determined. A vector sensorless control system using coordinate converters from a natural coordinate system to a stationary and rotating one and a state observer based on a mathematical model of a motor in a two-phase stationary coordinate system was used as a basic one when considering the structures of modern asynchronous electric drives. The main types of flow and speed observers of asynchronous electric drives are considered for the tasks of constructing a high-quality asynchronous electric drive with vector control without using sensors. The problem was formulated for further modernization of control systems based on an electric drive with a flow and speed observer.

Project Stratagems for a Nonlinear Vector Controller Fed BLDC Motor

Brushless DC (BLDC) motors are becoming an engaging alternative to DC and Induction motors. Various types of control strategies like direct vector control and indirect vector controls are illustrated for variable speed Alternating current drives. When those control strategies are applied to the proposed drive, there are certain drawbacks like instability, sensitive to parameter variations, etc. In this work, in order to get rid of the above difficulties, a design methodology is proposed in the closed loop control of BLDC drive, in which there is an instinctive flexibility to produce the required torque for various possible set of currents. Using this methodology we can attain better control over the drive. A suitable nonlinear and a robust controller makes the drive robust, which in turn makes the system insensitive to the parameter variations and increases the degree of stability. Robust control is a technique, which can precisely deals with uncertainty. These control techniques are used to accomplish robust performance and stability in the existence of bounded modeling errors. This paper gives more information regarding the design features of BLDC motor using MATLAB software

Investigation of Transients in Systems of Subordinate Regulation of Speed of an Engine of a Direct Current With Sensors of Intensity

The study presents the method of calculation of transients in the technically optimal [2] at speed (e.m.f.) systems with intensity detectors for controlling actions in the direct current drives A comprehensive analysis of the dynamical systems is given by differential equations, the order of which corresponds to the order of differential equations, which describe the corresponding systems. Moreover, the authors proceed from the assumption that the analytical calculations of automatic control systems allow readers to get more complete information on the transients in these systems. The analytical dependencies for all the DC drives considered in the work are provided.In the study of high order systems, a simplified differential equation may allow errors in the calculation of such parameters of the system as the magnitude of the maximum and the rate of increase of anchor current, when selecting the installed power of the converters and, in particular, their voltages. In more in-depth studies related to the formation of current diagrams of the anchor current, as well as in the calculation of the equalization current in dependent control systems. Also, errors can reach large values, since in these cases derivatives of high orders from the main function are used