Study And Optimization Of Working Characteristics Of Synchronous Permanent Magnetic Coupling

As a common component in mechanical equipment,the coupling is used to connect the driving shaft and the driven shaft to realize the transmission of motion and power.The traditional couplings are all contact transmission,while the permanent magnetic coupling(PMC)realizes the torque transmission between the driving end and the driven end through the magnetic action of the permanent magnets.Its main structure includes active rotor,slave moving rotor and isolating sleeve.It belongs to non-contact transmission and has the advantages of soft start,overload protection,no axial impact and convenient disassembly and assembly.The existence of isolation sleeve transforms dynamic seal into static seal,which can realize zero leakage.Among them,the synchronous permanent magnetic coupling is widely used in industrial production because it can transmit large torque.The solution methods for the performance parameters of PMC need to be improved in terms of calculation accuracy and solution efficiency at this stage.This paper aims to analyze the performance parameters of the synchronous permanent magnetic coupling,including the air-gap magnetic flux density,transmission torque between inner and outer rotors,and the eddy current loss in the isolation sleeve,by combining theoretical calculation and finite element simulation.The factors affecting the working characteristics of PMC were explored afterwards.Ultimately,the PMC was optimized.The contents and research results of this paper are as follows:(1)Overview of PMC.Initially,the characteristics of PMC compared with traditional coupling were summarized.According to different working principles,the PMC was classified.After that,the domestic and foreign status quo of the development and research of PMC was systematically,aiming at the existing problems,the research contents and research route were proposed.(2)The physical model and mathematical model of the synchronous permanent magnetic coupling were established.After the dimensions and material parameters of PMC were clarified,the physical model of PMC was constructed using modeling software.The mathematical model of the air-gap magnetic flux density of PMC was established subsequently based on the equivalent magnetic charge method.The air-gap magnetic flux density was theoretically calculated,and then using the results obtained by the simulation analysis,the variation of the air gap magnetic flux with the geometric parameters of PMC was introduced in detail.(3)The transmission torque of PMC was analyzed and solved by equivalent magnetic charge method and sheet current method respectively,and the calculated results were compared with the simulation analysis results.The factors affecting the axial torque were comprehensively analyzed.Both methods were corrected by introducing correction coefficients.After modification,the stability of the equivalent magnetic charge method was significantly improved,and the solution accuracy of the sheet current method was improved by about 18%.In the end,using the Taguchi robust design method,the PMC was optimized by establishing an orthogonal test table.(4)The reason for the eddy current loss in isolation sleeve of PMC was analyzed.Then the relevant geometric parameters were designed and calculated.After that,the mathematical model and finite element model of the isolation sleeve were established respectively to solve the eddy current loss power.Finally,the measures to reduce eddy current loss were put forward.