Simulation And Experiment Of Contactless Electric Energy Transmission In Ultrasonic Machining Based On Symmetrical Structure

Contactless electric power transfer technique is a novel method. Based onelectromagnetic coupling theory and energy conversion technology of modern powerelectronics, contactless power transmission technique can be utilized to transfer thepower from one side of separate transformer to secondary side which is connected witha load. It is expected that this technique will be widely used in many specialapplications.There are many shortcomings brought by the traditional power transmission in thefield of ultrasonic machining. While this paper will focus on the new method ofcontactless electric power transfer technology as well as a research into its techniques,with following contents:The related principles, system configuration, and research status of the contactlesspower transmission technology are introduced based on the principle of mutualinductance between primary and secondary windings. There is a brief exposition of thecharacteristics and many shortcomings brought by the traditional power transmission ofultrasonic machining, and a new design is thus presented.New contactless power supply system model has been established based on themutual inductance model, the associated circuit theory is analyzed. The voltage gain ofthe model and the transmission capacity of the system is discussed, the reactionresistance, reaction reactance and transmission efficiency with work frequency and loadresistance are discussed. The related compensation circuit compensating circuits areintroduced, each of the four properties compensation circuit are analyzed. The primaryand secondary side shunt capacitor compensation circuit network is established, relatedcompensation parameters are calculated of this paper.Relevant design parameters are calculated. The core size, primary and secondarycoil turns, wire diameter and other parameters are determined. Two physical models inMaxwell simulation software for separate transformer are designed. The symmetricalpot core model coil inductance, mutual inductance and coupling coefficient with air gaphave been investigated. The transmission efficiency of the system with work frequency,voltage amplitude level and air gap are discussed. The feasibility by the primary side isa U-core model are established and analyzed, and the transmission efficiency of the system with the number of the primary core are calculated, the coil position on thecoupling coefficient is analyzed.The separate transformer parameters are tested and verified for a simulationplatform. By comparing test results to simulations, the optimal model parameters canthen be established.