Research On Heat Dissipation Method Of Permanent Magnet Magnetic Coupler

There are many types of magnetic transmission devices as one of the permanent magnet magnetic coupling,which has the advantages of energy saving,pollution-free operation and convenient use.The permanent magnet magnetic coupler has a simple structure and is more robust and durable than the general transmission device,and can be used in harsh environmental conditions.However,the heat generated by eddy current loss will cause the permanent magnet to lose its magnetism.Therefore,the research on heat dissipation of permanent magnet magnetic coupler is the key point.The main research contents of this paper are as follows:Firstly,based on an existing prototype of a permanent magnet magnetic coupler,this paper studies the numerical variation of the eddy current distribution and eddy current loss of the permanent magnet magnetic coupler under the conditions of different air gap lengths and different slip speeds.And based on the theoretical equations of fluid-solid coupling and heat transfer,the slip speed and the length of the air gap between the copper disc and the permanent magnet were changed respectively,and the temperature rise distribution of each part of the permanent magnet magnetic coupler was calculated.The finite element simulation calculation The scientificity of the method will be verified by the comparison of the temperature rise of the prototype experiment and the finite element simulation.Aiming at the problem that the copper plate of the permanent magnet magnetic coupler generates heat,the permanent magnet body temperature rises too high,which leads to the loss of magnetism,and the device cannot work normally.Air-cooled heat sink structures of different shapes are designed,and the optimal heat sink structure is selected through comparative simulation analysis.The optimal interval of the optimal heat sink structure design parameters is selected to provide a basis for the research on air cooling and heat dissipation of the permanent magnet magnetic coupler.Secondly,based on the research on the existing permanent magnet magnetic coupler prototype,referring to the design parameters of permanent magnet magnetic coupler at home and abroad,with the goal of increasing the output torque,the inner and outer diameters of the copper disc and the size parameters of the permanent magnet are designed.For comparison and selection,a high-power permanent magnet magnetic coupler is designed.On this basis,the Taguchi method is used to optimize the design of the permanent magnet length,width,magnetization direction length and copper plate thickness of the permanent magnet magnetic coupler,so that the output torque of the permanent magnet magnetic coupler is improved on the original basis.The performance indicators of the permanent magnet magnetic coupler are analyzed and researched,which provides the basis for the subsequent design and research of the permanent magnet magnetic coupler.Finally,in view of the problem that the high-power permanent magnet magnetic coupler is in operation,the permanent magnet is seriously demagnetized and the device cannot work safely.Two types of slotted water-cooling structures,the spiral type and the "Z" type,are designed.The optimal slotting structure was selected by analysis,and the influence of slotting depth,number of slots and inlet water velocity on the heat dissipation effect under the condition of the optimal slotting structure was simulated and analyzed,and then the slotted structure under the optimal heat dissipation effect was obtained.The design parameters and water speed conditions of the water-cooling system provide the basis for the research of water cooling and heat dissipation.