Study On Thermal Theoretical Analysis Of Maglev Supporting And Experimental Verification

With the rapid development of computer, automation control and microelectronics, the application of maglev supporting technology is more and more broad, especially the application of the active magnetic bearings (AMB) which is the typical structure of the maglev supporting. However an obstacle occurs during the research of the AMB presently, that is when the AMB circumvolves in a high speed, the rotor appears a severe phenomenon of temperature-hoisting, which has a great influence on rotor's precision and duration. This article mainly aims at the research of temperature field based on this questions brought forward above.This article briefly introduces the knowledge of temperature field, analyses the principle of temperature field and all kinds of heat transfer mechanism, summarizes the research achievement of temperature field at home and abroad, and narrates the reason and meaning of the study on the temperature field of the AMB. The paper seeks the boundary condition of the AMB through theoretical calculation,evaluates and analyzes the distributing of temperature field of the axial and radial AMB adopting the method of infinit element and construes the causes of appearing such kind of temperature distributing.Through the experimental comparison, this article obtains that controlling the amplitude of the current is one of the factors of affecting the coil's total loss while its bias current and frequency are under the invariable condition, which is for a single loop by changing the amplitude of the current. In addition, it can be seen from the experiment that inputting sine wave and square-wave and triangle wave voltage under the same condition and in the same magnetic flux density amplitude, square wave generates the largest power loss, sine wave the less.In addition, the speed maglev, which is the typical structure of the line maglev supporting, has been analyzed and verified experimentally. The speed maglev is an maglev experiment device which has two degrees of freedom and is actively controlled, utilizing the theory of machine and the centripetal effect of magnetic field to predigest suspending theory by two degrees of freedom in a proximal work status of single AMS. This discourse mostly does some research on experiments of temperature field of the speed maglev. In the first place, this article makes use of commercial infinit element software ANSYS to carry through the stimulation and analysis of temperature field, and then employs the HY-2988G infrared thermography which is made by Wuhan Huazhong Numerical Control CO.,LTD to measure the distributing of temperature field of the speed maglev. Through ceaseless load on maglev coasters and changing its manners of controlling electric current, this paper measures the status of the temperature-distributing under different state of controlling electric current, and consequently provides theoretical basis for further optimizing the speed maglev.Through the analysis of experimental results, this paper proposes that controlling current amplitude and different waveform voltage will influence the magnetic bearings'loss, and depart the hysteresis loss and the eddy current loss in theory, but the experimental separation still needs further research.