NDIRECT MEASUREMENT OF THE ROTOR SPEED OF AN ASYNCHRONOUS MOTOR

Abstract

Background. The object of research is electric drives based on an asynchronous motor. The subject of the study is the indirect measurement of the rotational speed of an asynchronous motor in such electric drives. The purpose of the study is to construct an observer of the rotational speed of an asynchronous electric drive, which allows, by mathematical modeling and subsequent tuning, to obtain acceptable estimates of the rotational speed of an asynchronous motor. Materials and methods. To study the indirect measurement of the rotational speed of an asynchronous motor, methods of mathematical and computer modeling based on the Mathlab software package of an electric drive with an AIR112MA8 asynchronous electric motor operating at a constant load were used. Results. The parameters of the rotor rotation frequency observer have been adjusted on a computer model of an AIR112MA8 asynchronous motor, the results of which can be used to estimate the rotation frequency of an asynchronous electric drive operating at a given load. Conclusions. The proposed approach for evaluating the indirect measurement of the rotational speed of the rotor of an asynchronous motor can be used in the design and operation of asynchronous electric drives with observers of the rotational speed state.

Keywords

• indirect method of measuring the rotational speed
• equations of flow coupling and rotational speed observers
• simulink-model of the air112ma8 engine
• simulink-model of the electric drive
• absolute error in estimating the rotational speed with indirect measurements using state observers