| Magnet rotation-type Axial-flux Speed Adjustable Magnetic Coupler(MASAMC)is a new type of transmission device without contact between the driving disc and driven disc based on the principle of electromagnetic induction.Not only does it have the advantage of Traditional Axial-flux Speed Adjustable Magnetic Coupler(TASAMC),such as vibration isolation,overload protection,speed regulation,energy saving and so on,but also the new speed regulation method with the rotation control of permanent magnets(PMs)also has better maneuverability and better energy saving effect.Therefore,the research on the MASAMC has a great significance in academic research and practical engineering application.In this paper,the research on the MASAMC is mainly focused on as follow:Firstly,the numerical calculation of air-gap magnetic field and electromagnetic torque of MASAMC is presented.Base on reasonable assumptions about the mathematical model of MASAMC,the general solution of magnetic vector potential of each region can be obtained by the establishment of theoretical layer model and the use of vector magnetic potential method,and then the specific value of the vector magnetic potential can be obtained by using boundary conditions between different layers,the magnetic field distribution in the air gap layer of MASAMC is obtained,finally,the electromagnetic torque can be calculated by combining 3-D correction factor.Secondly,the finite-element(FE)method is used to optimize the dimension parameters,analyze the driving force,analyze the magnetic field characteristics,and analyze the eddy current and axial force of MASAMC.The FE model is established according to the actual movement process of MASAMC during the process of speed regulation,the influence of the polar arc coefficient on the torque density and the rotating force of the PMs are researched respectively,and the appropriate polar arc coefficient is selected on this basis;The stress condition of key parts of MASAMC is calculated on the base of the running process of the speed regulating device;Static and transient magnetic field analysis of MASAMC with different rotation angles of PMs are analyzed respectively to study the change of the magnetic field during the process of speed regulation;The eddy current distribution in copper layer of MASAMC is gotten by simulation and the relationship between eddy current loss and rotation angle of PMs is determined;The axial force between driving disc and driven disc with different rotation angles is analyzed,and the relationship between the rotation difference and the axial force of MASAMC is studied.Thirdly,the speed regulation performance and startup performance of MASAMC are studied.The mechanical characteristic of MASAMC with different rotation angles are obtained by FE simulation,and the working condition and speed regulation performance of coupler with variable torque load are studied by combining the load curve of fan or pump with different variable load coefficients.On this base,the speed regulation range of the MASAMC is analyzed when the fan or pump is loaded with different variable load coefficients;Based on the mechanical characteristic,the starting state of MASAMC with different loads at different start-up stages is analyzed.Finally,the energy saving performance of MASAMC is studied.The nergy-saving effect of MASAMC under constant torque load and variable torque load are analyzed respectively,and the variation of air volume and wind pressure during speed regulation under variable torque load according to the fan performance curve;The principle of speed regulation of TASAMC and MASAMC are explained respectively,base on this,the energy consumption of the two couplers with the same speed regulation progress are calculated,thereby the energy saving effect of the speed regulating devices of the two couplers can be explained by comparison. |
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