Research And Design Of High-Power Air-cooled Permanent Magnetic Driver

The Permanent Magnetic Driver(PMD)is a device based on the magnetic coupling and the Faraday electromagnetic induction principle.It controls the output torque by adjusting the air gap between the conductor disk and the permanent magnetic disk.As a kind of new energy saving speed regulating equipment,Permanent Magnetic Driver with soft start function strong,non-contact energy transmission,nonslip failure type overload protection,speed regulation process stepless smooth,adapt to changing workloads,anti-interference ability is better than the frequency conversion speed regulation,low harmonic pollution to the power grid,low requirements of installation centralization,higher reliability advantages.Suitable for conveying belt,elevator,fans,pumps,compressors,centrifuges,shredders,pulpers,mixer and other constant torque load.Widely used in mining,cement,power generation,oil,natural gas,chemical industry,sewage treatment,irrigation,marine,general manufacturing and other industries.Firstly,starting from the theoretical basis of electromagnetic field,research and analysis on the structural parameters of the finished product prototype of 500kW Permanent Magnetic Driver.From the inner and the outer diameter of copper disk,copper disk thickness,shape and position of the permanent magnet,the size of air gap and other aspects to design a high-power air-cooled Permanent Magnet Driver,power of 1000kW,established the mathematical model of 3D transient field.The transient magnetic field of the high-power air-cooled Permanent Magnetic Driver is analyzed and calculated by the finite element software Ansoft.The eddy current distribution in the conductor plate,the magnetic flux density distribution in the conductor plate,the eddy current losses in the conductor plate and the output torque of the load end are analyzed,solved the problem of less power of Permanent Magnetic Driver.Secondly,an analytical model is established by using the method of separation of variables in the modeling aspects of Permanent Magnetic Driver,based on the analytical model to derive the expression of the output torque to provide a theoretical basis for the research and design of high-power air-cooled Permanent Magnetic Driver.Based on genetic algorithm to optimize the structure parameters of the Permanent Magnetic Driver,the output torque expression is set as the objective function to improve the output characteristics of the Permanent Magnetic Driver.Finally,based on Workbench ANSYS software to simulate the operating state of the high-power air-cooled Permanent Magnetic Driver in the condition of 60r/min and air gap is 3mm.Through the analysis of temperature field,the highest temperature in the copper disk,the copper disk eddy current losses generated heat is the main heat source to pass to permanent magnetic disk through the heat transfer,thermal radiation and heat convection.Through the analysis of the stress field,show that the stress and deformation of the copper disk and permanent magnetic disk meet the long-term stability operation requirements of high-power air-cooled Permanent Magnetic Driver.