Thermal Analysis And Structural Improvement Of Permanent Magnet Couplers

Permanent magnet couplers are widely used in rotating machinery because of their flexible start-up,high efficiency and energy saving.However,it will generate a certain eddy current loss during operation,and the eddy current loss is the main heat source of the permanent magnet coupler,which will cause the permanent magnet coupler to generate a certain temperature rise during the working process.The magnetic properties of the magnet,which in turn affects the normal operation of the permanent magnet coupler.This paper improves the heating problem of the permanent magnet coupler by improving the air-cooling heat dissipation structure of the permanent magnet coupler,thereby reducing the operating temperature of the permanent magnet and ensuring the safe and efficient operation of the permanent magnet coupler.Firstly,the distribution of the fluid field and temperature field of the permanent magnet coupler under high inertia load is analyzed,and corresponding improvement measures are proposed.Then,the ventilation holes of the air-cooled heat dissipation structure are studied.The shape,eccentricity,radius,inclination and number of vent holes are simulated and analyzed to obtain an optimal cooling scheme.Secondly,the air-conducting fins of the air-cooled heat-dissipating structure are studied.The shape,thickness,height and number are simulated and analyzed to obtain the optimal cooling scheme.Finally,the stress field calibration of the mechanical strength of the key components of the permanent magnet coupler is performed to ensure its mechanical strength can meet the normal operation requirements after the improvement of the heat dissipation structure of the permanent magnet coupler.By comparing and analyzing the temperature field diagram of the permanent magnet coupler before and after improving the heat dissipation structure,the air-cooling heat dissipation structure significantly reduces the temperature of the permanent magnet coupler and the permanent magnet,and has obvious heat dissipation and cooling effect.Moreover,the air resistance generated by the air-cooled heat dissipation structure is small,and the normal operation of the permanent magnet coupler is basically not affected.The numerical simulation results show that the method is important for improving the heating problem of permanent magnet couplers under heavy load conditions.