EXPRESS METHOD OF DETERMINING INSTANT CHARACTERISTICS OF ASYNCHRONOUS ELECTRIC MOTORS

Abstract

A current trend during the last decade is the growing importance of automated electric drives that use asynchronous electric motors. This is due to the development of theoretical methods for modeling their work with high accuracy and a decrease in the cost of power semiconductor technology, which contributed to improving the efficiency and reducing the cost of such systems. This trend has led to the expansion of induction motors not only in traditional electric drive systems with easy starting conditions, but also in traction systems and systems with large starting torques that normally used DC motors. However, this has also led to technical challenges in the design and operation of induction motors due to their particular mechanical characteristics, which have a slightly lower starting torque value. This disadvantage can be eliminated by increasing the motor power in the design, but this can lead to a decrease in efficiency and an increase in the cost of the electric drive. Therefore, it is important to conduct further research to improve the starting characteristics of induction motors. With this in mind, asynchronous motors remain the most common electric machines used in various industries. Their use in industry is growing, and their applications are constantly expanding. The development of express methods for determining torque characteristics, which will allow to reduce the complexity of determining the starting torques of asynchronous motors, is an urgent task that is of great importance in practice. This article offers an express method for determining the torque characteristics of asynchronous electric motors, which helps to significantly reduce the complexity of testing such machines. A general mathematical model for controlling the torque characteristics of electric machines has also been developed, which makes it possible to unambiguously establish the dependence of the starting torque of an asynchronous motor on the angular position of the rotor on the basis of data obtained during experiments.