| Magnetic coupler is a kind of non-contact speed governing device,which has the properties of energy saving and overload protection and soft start.It is often used in mining,chemical industry,electricity generation and other engineering fields.The study target of this paper is the squirrel cage disk magnetic coupler with rotating magnet.Next,this kind of magnetic coupler is studied from the following aspects:(1)Theoretical calculation of air gap magnetic density and mechanical characteristics of squirrel cage disk magnetic coupler with rotating magnet.The twodimension model of the squirrel cage disk magnetic coupler with rotating magnet was established.The coupler was divided into five regions.According to the different media in region two,the vector magnetic potential formulas in the yoke teeth and the copper disk were deduced respectively.The structural parameters and working parameters of the coupler were substituted into the theoretical model,and the axial air-gap magnetic field distribution and mechanical characteristic curves were obtained.(2)Simulation analysis,neural network prediction of magnetic field and dynamic performance of squirrel cage disk magnetic coupler with rotating magnet.The air gap magnetic density distribution of rotating squirrel cage disk magnetic coupler at different positions was simulated by finite element method,and the effect of yoke teeth on the air gap magnetic density was explained.The magnetic field distribution of different rotation angles at the middle air gap of the permanent magnet was simulated by finite element method to explain the effect of rotation angles of the permanent magnet on the air gap magnetic field.The intermediate air gap magnetic field and mechanical characteristics curve of the squirrel cage disk magnetic coupler with rotating magnet were simulated to verify the correctness of the theoretical model.A prediction method based on neural network algorithm was proposed.Combined with some simulation data,the magnetic field,output torque and mechanical properties of the coupler under different air gap thicknesses with speed difference of 30rpm were predicted,and the results were compared with the finite element simulation values.(3)Analysis of speed regulation characteristics of squirrel cage disk magnetic coupler with rotating magnet.The mechanical characteristics of the squirrel cage disk magnetic coupler with rotating magnet under different air gap thicknesses were simulated by finite element method.Bonding the characteristics of constant torque,variable torque and constant power load,the speed regulation interval under different load conditions was found and the speed regulation process was analyzed.(4)Construction and experimental research of intelligent test platform.The construction process of the intelligent test platform and the two test modes of the intelligent test platform console are introduced.The efficiency characteristic curve of the squirrel cage disk magnetic coupler with rotating magnet and the mechanical characteristic curve under different air gap thickness are measured.The influence of the air gap thickness on the mechanical characteristic of the coupler and the influence of the speed difference on the efficiency characteristic are studied.The starting process of couplers with constant torque load under different air gap thicknesses was measured,and the effects of air gap thickness on the input and output speed,input and output torque and starting performance of couplers were analyzed. |
