Vector Control of Asynchronous Motors with an Optronic Sensor Algorithm Generator

The article discusses the principle of constructing frequency control of an asynchronous motor with a six–channel sensor algorithm generator. Purpose: The broad spectrum of benefits offered by an asynchronous electric motor equipped with a closed-loop rotor in conjunction with a frequency converter has resulted in the extensive utilisation of such an electric drive in numerous domains. Concurrently, the technical implementation of automatic frequency converter control systems is challenging, and their financial expense greatly exceeds that of an asynchronous motor. The proposed method for controlling a frequency converter, based on direct vector control from an optronic sensor algorithm generator, allows for a wide range of motor speed control with an optimal ratio of energy and mechanical properties. The sensor’s rigid connection to the motor rotor establishes a constant slip, thereby dictating the inverter key’s operational algorithm, the frequency at which it operates, and the position of the rotor clutch-flow vector relative to the clutch-flow vector of the stator winding across the entire control range. Methods: A series of experimental studies have been conducted on a laboratory installation, and operational, mechanical, and control characteristics have been obtained. Results: The investigation has revealed a linear relationship between the motor speed and the voltage input to the inverter, whereby an increase in torque resulted in a decrease in motor speed. Additionally, in the absence of load and at idle, the motor speed has been found to exceed the nominal value by a significant margin. At a motor load of approximately 70% of the rated value, the speed, current and torque correspond to the rated values. However, the efficiency is 15% lower than the rated value, due to losses in the rectifier and inverter, and higher harmonics. Practical significance: The research has confirmed the operability of the proposed method over a wide range of speeds and loads, and it will be important for evaluating the applicability of the control method in a power electric drive.