The Performance Analysis And Testing Of The Permanent Magnet Coupling Drive System

With the rapid development of permanent magnetic transmission technology,permanent magnet coupler as the main instrument of magnetic transmission technology,is widely used in machinery,petrochemical and other industries.This paper studies the cylinder type permanent magnet coupler,which not only has the advantages of high magnetic energy utilization,nonload starting characteristic and no axial force,but also achieve non-physical connection transmission through the coupling effect between the active rotor and the driven rotor.It thus could solve the problem of seal,transport medium and other issues caused by traditional mechanical connection.On this account,it can achieve the effect of energy saving and environmental protection.With the deeper progress of national sustainable development strategic objectives,energy saving brook no delay.Therefore,the analysis of the permanent magnet coupler is even more important.In this paper,Ansoft finite element software is used to model the cylinder type permanent magnet coupler,and to set the model material,boundary conditions and so on.Then,this paper analyzes the influence of different structural parameters on transmission torque,eddy current loss,average magnetic density and magnetic induction intensity distribution.The results show that: When different structural parameters change,the variation tendency of magnetic induction is almost the same as that of torque;When the other parameters keep unchanged,as the speed difference increases,the transmission torque increases first and then decreases,and reaches the maximum at 500 rpm,also,eddy current loss always increases;When the speed difference keep unchanged,the torque,eddy current loss and average magnetic density increase first and then decrease with the increase of conductor thickness and magnetic pole number;When only increase the permanent magnet thickness,the torque,eddy current loss and average magnetic density increase first and then tend to be stable;When only increase the air gap thickness,the three showed a decreasing trend;In addition,the bigger the coupling area is,the more obvious the coupling acts effect,thus make the torque,eddy current loss and the average magnetic density increased continuously.At the same time,according to the results of software simulation,via optimizing the structure of cylinder type permanent magnet coupler and we can know: The optimum structure of the cylinder type permanent magnet coupler is when the permanent magnets is 12 poles,the conductor thickness is 5 mm,the permanent magnet thickness is 25 mm,the air gap thickness is 4 mm,the permanent magnet axial length is 30 mm.Then model and analyze the permanent magnet coupler under the optimum structure by finite element analysis,thus obtain the transmitted torque value,eddy current loss value and magnetic induction intensity distribution field diagram.Finally,combined with the working characteristics of the cylinder type permanent magnet coupler,choose the reasonable and appropriate torque measurement method to construct the dynamic performance test platform;measure the transmission torque value under the optimum structure of the cylinder type permanent magnet coupler at different coupling areas and speed difference;Compared with the results of finite element simulation,and analyze the relationship between performance testing and software simulation.Thus provides: Finite element software can be used as an effective tool for the analysis of permanent magnet coupler.The simulation result is the same as the test,and the error is small.