Computational analysis of the temperature improvement of electric asynchronal motors
Journal Title: Вісник Житомирського державного технологічного університету. Серія: Технічні науки - Year 2019, Vol 83, Issue 1
Abstract
In the development of electric machines as a whole, as well as asynchronous motors, in particular, the limit values of temperature are the key factors that affect the efficiency of the overall design. Since the usual load of asynchronous motors often occurs, hence, the estimation of temperature rise with the help of mathematical modeling tools and computational experiments becomes more and more important. In this paper, we develop and test experimentally the model of loss accounting and the description of thermal phenomena in asynchronous motors. The developed model was introduced at FEMLAB, and was used to predict the temperature rise in the fully closed fan cooling of asynchronous motors. Comparison with experimental results obtained according to the standard of 1.5 kW. The motor model shows the effectiveness of the developed model in predicting the temperature increase for a number of operating conditions, in particular for different frequencies and voltages. Finally, the SIMULINK control loop was developed using the thermal model as input. An electric machine is a complex engineering system consisting of different materials of different thermal properties and distribution of heat source. Although we observe successes in many aspects of the design of an electric machine, we generally agree that the development of thermal design methods for electric machines is lagging. One of the most commonly used AC machines applied for industrial purposes is an asynchronous electric air-cooled electric motor (TEFC). These motors are often driven by alternating voltage and variable frequency. As a result, we can achieve variable speed and torque control for specific loads, but the charge for this will be an increase in the operation of the engine temperature. In addition, it is well known that one of the high source temperatures is an increase in voltage on asynchronous motors and insulation systems. Recognizing the importance of the thermal factor in the overall efficiency of motor design, there are different methods have been proposed for thermal control, in particular, related to the temperature of the rotor and stator. Most of these methods are based on some intermediate estimates, such as rotor resistance and identification, but with the application of such methods, there is little to be said about the temperature distribution and the detection of thermally critical parts of the engine under this operating condition.
Authors and Affiliations
D. Zubenko, О. Petrenko
Keywords
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