Research On Rotating Electromagent For 2D Valve

As the development of modern industry, hydraulic control technology has been widely used. Its development has received intense attention and invested in the developed countries all around the world. The extent of its application has become one of the important symbols of a country's industrial level. As a key control component of the electro-hydraulic servo system, the performance of electro-hydraulic servo valve will directly affect or even determine the performance of the whole control system. The development of modern industrial technology puts forward higher requirements on control accuracy and response speed of electro-hydraulic servo valve, thus there is an effective solution to meet the requirements by improving the internal structure of servo valve.In each link of electro-hydraulic servo valve, the response of electro-mechanical converter is the most lagged link. The response time of electro-mechanical converter usually accounts for 70% to 80% of the entire electro-hydraulic servo valves response time, which means that electro-mechanical converter plays an important role in the electro-hydraulic servo valve. In this dissertation, a new electro-mechanical converter for 2D valve that is rotating electromagnet was designed based on relevant research on electro-mechanical converter. A stator and mover doubly salient structure was adopt, and permanent magnetic materials which have high-energy product and hollow cup rotor structure was also adopt in this dissertation which increase the magnetic flux density of the air-gap, reduce the moment of inertia of the rotor, and increase the power density in unit volume. Thus the response frequency of rotating electromagnet becomes higher. The contents of each chapter are listed as follows:In chapter 1, the background of research, the purpose of research and its significance are proposed firstly. And many relevant research documents on the subject are reviewed in the next, then the main task are listed in the end.In chapter 2, the magnetic circuit structure and working principle of rotating electromagnet were presented firstly, and then the radial magnetic field of rotating electromagnet was analyzed based on finite element theory which provided theoretical basis and analysis basis for analyzing equivalent magnetic circuit and electrical and mechanical energy conversion in the followed part. In chapter 3, the equivalent magnetic circuit of rotating electromagnet was established at first, and then the air-gap flux of mixed magnetic field caused by rotating electromagnet was calculated based on air-gap permeance. After the analysis on electrical and mechanical conversion based on equivalent magnetic circuit, the co energy curve and electromagnetic torque curve of rotating electromagnet were obtained by MATLAB.In chapter 4, the dynamic mathematical model of rotating electromagnet was established in the beginning, after that the tracking response to square wave, sine wave and triangular wave on rotating electromagnet were simulated on the application of Runge-Kutta method.In chapter 5, the structure of rotating electromagnet was designed and the prototype was trial-manufactured. And the experimental platform was also established to test the dynamic response performance of rotating electromagnet. At last the experimental curves were analyzed.In chapter 6, the conclusion and prospect of the research are proposed.