| With the development of high-precision industries such as aerospace,defense,and semiconductors,the demand for machining of materials with hard and brittle properties has become more and more vigorous.As one of the important methods of processing hard and brittle materials,the technology of rotating micro electrical discharge machining(EDM)has also been rapidly developed.However,there are some problems in the traditional rotating micro-EDM technology,such as the low electrode rotation speed and the inability to automatically change the tool,which hinders the further development of this technology in terms of machining accuracy and automation.Magnetic coupling resonance wireless power transmission(MCR-WPT)technology has the advantages of no contact between the two sides of the power supply,long transmission distance,high transmission efficiency and low position requirements,and is especially suitable for EDM systems,which provides a solution to this problem.However,the research on resonant wireless power transmission technology mostly stays in the laboratory stage,and there are relatively few researches on practical applications.Therefore,from the perspective of practical application,this paper studies the key issues in the design of resonant wireless power supply system for rotating micro-EDM.The main contents are as follows:(1)Based on the modeling and analyzing the four basic topological structures of the MCR-WPT system,the calculation formulas of system output power,transmission efficiency and compensation capacitance are obtained,and based on the characteristics of micro-EDM The series and series compensation structure are selected as the basic structure of the circuit,and the influence of mutual inductance,resonance frequency and load resistance on the system is explored,and the optimal parameters of each component in the system are obtained.(2)Research the key component in the wireless power supply system—resonant coil,and get the law of selection of various parameters in the coil.According to the waveform requirements in micro-EDM,two waveform transformation schemes that meet the requirements are proposed,and the feasibility of the scheme is verified by software simulation.(3)The various changes of the system are studied through theoretical analysis and simulation test methods,and the load resistance,system frequency,relative position of the two coils and the change law of system characteristics when ferrite shielding material is added between the coils are obtained.Verify the adaptability of the system in different usage scenarios.(4)An experimental platform is built and the law of system output power change caused by some parameter changes in the wireless power supply system is experimentally verified.By comparing the results of theoretical calculation and simulation experiments above,it can be found that the overall laws of the two are consistent and the error is small,which proves the rationality of the system. |
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