Simulation Research On The Air Cooling Structure Of Permanent Magnet Coupler

Magnetic coupling is a new type of transmission,it is a kind of non-contact transmission device which is used the magnetic force to achieve the force or torq ue,it has many advantages such as simple structure,energy saving and environ mental protection,stable and efficient etc.But it will produce certain eddy current loss in operation which will cause the temperature rise.The permanent magnet material is most affected by temperature,When the maximum temperature of the permanent magnet coupler approaches or exceeds the safe operating temperature of the permanent magnet material,it will cause the permanent magnet material occur the irreversible demagnetization phenomenon,When the maximum temperature reaches the permanent magnet material Curie temperature,it will cause the permanent magnet to lose magnetic properties and make the permanent magnet coupler work failure.So in order to avoid this kind of situation,It is necessary to take appropriate measures to ensure that the maximum temperature of the permanent magnet material is within the safe temperature range.Firstly,the working principle and temperature distribution of permanent magnet coupling was analyzed.The analysis results showed that the highest temperature appears on the copper plate on the outer rotor.At the same time,there was a certain high temperature air in the working air gap.it was not conducive to the heat dissipation of the permanent magnet.So this paper designed a new type of permanent magnet coupler wind cooling structure,this structure was divided into two parts-wind fins and the wind hole,Among them,The windshield fins were mounted on the outer rotor conductive steel plate to dissipate the outer rotor heat;The inlet hole was located on the conductive steel plate for guiding the outside flow air into the working air gap,so that the internal high temperature air was discharged to reduce the temperature of the permanent magnet.This article was as follows:First of all,this paper carried on the simulation to the wind deflector,the fin thickness,the height of the front fins and the length of the fins of the front fins were selected as the subjects,the single factor experiment and the orthogonal experiment were arranged and analyzed by the range analysis method.Then using the above results to model and simulate to obtain the optimal number of installed,and compared with the model without the installation to analyze its cooling effect;Then,the air inlet was simulated.Three kinds of air inlet holes were designed.And the inclined holes were arranged with the optimal opening shape,and the inclined holes of different angles were arranged and analyzed to obtain the optimal one.Finally,the results were modeled and simulated to obtain the optimal number,and compared with the model which was not open into the air hole to analysis its dissipation effect;Finally,the simulation and experimental results of the wind deflector and the air inlet were simulated,the results were compared with the model without windshield heat dissipation structure to analyze the overall heat dissipation effect.The results were as follows: The first part was the study of the flywheel.Under the single factor experiment,the optimal thickness of the fin was 5mm,the height of the front fin was 35 mm,the length of the front rib was 10 mm.Arranging the orthogonal experiment,The actual optimal combination was A2B2C2 using the range analysis method.And then use the optimal combination to analyze the number of wind heat sinks.the results showed that the installation of 8 windscreen heat sink was the most appropriate.Finally,the comparative experiment showed that the air flow condition of the outer rotor conductive steel pate had been changed successfully after installed the windshield heat sink.it could effectively guide the surface of the high temperature air to the surrounding discharge,it had a certain cooling effect and could reduce the outer rotor temperature of 12.2%;The second part was to study the air inlet.It was found that the circular inlet scheme was the most reasonable.The inclination angle of 60° was found to be the most ideal for the heat dissipation effect.Then,the results of the above simulation were used to model the number of openings.The results showed that eight 60° inclined circular air holes were the most suitable.Finally,The maximum temperature drop of the outer rotor reached 12%,and the maximum temperature of the permanent magnet decreased by 53%,and the inlet air hole changed the temperature distribution from a high-temperature to a low-temperature region in the center,and the cooling effect was remarkable;The third part was the overall analysis of the wind-driven heat dissipation structure.After comparing the experimental results,it was found that the maximum temperature of the outer rotor was reduced to 30% and the maximum temperature of the permanent magnet was reduced to 60%.The test results showed that the error between the temperature and the simulation results was less than 10%,which proveed the rationality and correctness of the simulation method.Finally,the content of this paper was summarized,and the research direction of the subject was also discussed.