中小型異步電機鐵耗分析計算方法研究
[Abstract]:With the rapid development of national economy, the state has put forward the important decision of energy saving and emission reduction in the new century. As the most widely used motor type in the motor industry, the medium and small power asynchronous motor provides a great help for the prosperity of our economy in all kinds of industries. Asynchronous motor as a large energy consumption in China's energy economy, the standard of its loss is becoming higher and higher. With the increasing use of frequency conversion power supply, it is necessary to discuss the iron loss of motor, especially the prediction and calculation of iron loss in the design stage of motor. In this paper, the basic principles of hysteresis loss, eddy current loss and abnormal loss of ferromagnetic materials are introduced. Because the iron consumption produced by ferromagnetic material under the operation of motor is very different from that of ferromagnetic material itself, other factors affecting the iron consumption of motor are also discussed in this paper. Secondly, aiming at the rough calculation method of iron loss in domestic engineering, under the condition of sinusoidal voltage supply, this paper establishes the trinomial discrete calculation model of iron loss of asynchronous motor based on the classical magnetic circuit analysis method, and under the condition of SPWM power supply, The iron loss model under sinusoidal power supply is improved by harmonic analysis method to adapt to the study and calculation of iron loss of frequency conversion motor. Then, the time-step finite element method is used to simulate the no-load operation of the motor under these two kinds of power supply conditions, and the calculation value of iron loss of the finite element method is obtained. Finally, the simple calculation method of iron consumption under sinusoidal power supply and the calculation result of waveform coefficient method under frequency conversion power supply are compared with the calculated results of iron consumption model established in this paper. Compared with the calculated results of finite element method, it is proved that the calculation model of iron consumption is reliable and has certain practical value in engineering.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM343
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