Estimation of energy characteristics of the asynchronous motor with a combined winding

Abstract

PURPOSE. Asynchronous motors are the main consumers of the electrical energy. Increasing their energy performance can contribute to a significant reduction in energy consumption in general. Using a combined 12-zone winding instead of the standard 6-zone one theoretically can lead to a decrease in electrical losses in the stator winding of the asynchronous motor and to reduce additional losses caused by the higher spatial harmonics. The main purpose of the work is to assess the effect of using a combined winding stator on the energy characteristics of the induction motor.METHODS. The study was performed on two AIR71V4 electric motors, one of which had a standard winding and the other had a combined winding. In the experiment, the engines were rated voltage, and the load was carried out using an electromagnetic loading device. The engines were tested in the range of loads from idle to the nominal. The experiment was performed five times.RESULTS. The work under analysis shows the dependences of the current strength, consumed active and reactive power, efficiency, and power factor from engine load.CONCLUSION. The results of the study showed that an asynchronous motor with the combined winding over the entire investigated range of loads has a lower consumption of both active and reactive power, compared to a motor with a standard winding, while the power factors of these motors are practically the same. The greatest difference in efficiency was observed at loads lower than the nominal in favor of an improved engine model, but also at rated load, the motor with a combined winding has the higher efficiency of 3,1%.