| The disc-type speed-regulating permanent magnet coupler is widely used in many kinds of equipments such as fans,pumps and belt conveyor in petrochemical,hydro-electric,mining and marine industries due to its advantages of soft start,high efficiency,environmental protection and excellent speed-regulating performance.Due to the measured disc type speed permanent magnetic coupler performance is one of the standards of the size of the output torque,and its core component of ndfeb permanent magnet materials greatly influenced by the temperature,when the temperature is too high performance permanent magnet will be sharply reduced or even completely failed,so it is very important to study the electromagnetic field,temperature field and cooling device of the disc-type speed-regulating permanent magnet coupler.In this paper,Ansoft Maxwell software is used to analyze the electromagnetic field of the disc-type speed-regulating permanent magnet coupler.Since there are many factors affecting the torque,the influences of copper plate thickness,air gap size and permanent magnet thickness on the torque are analyzed.The eddy current distribution on the copper disk and the eddy current loss data for the subsequent temperature field analysis are obtained.Then the eddy current loss obtained by the electromagnetic field analysis is used as the heat source,and the temperature field of the disc-type speed-regulating permanent magnet coupler is analyzed by Ansys Workbench software.The influences of copper disc thickness,air gap size and permanent magnet thickness on temperature are obtained,as well as the temperature distribution of copper disc and permanent magnet under the condition of rotating speed of 45r/min and 135r/min.Because the temperature of copper disk and permanent magnet is too high under the condition of 135r/min,a straight-rib radiator is selected to cool the disc-type speed-regulating permanent magnet coupler.Fluent software was used to analyze the flow field of the radiator,and the flow velocity distribution in the flow field and the flow velocity under different structural parameters of the radiator used for subsequent temperature field analysis were obtained.Finally again using Ansys Workbench software of radiator with a straight rib plate,the temperature field of the permanent magnet type coupler are analyzed,and obtained the radiator fin height,thickness and the number of copper plate,and the influence of the temperature of a permanent magnet and after adding radiator copper plate and the temperature of the permanent magnet cloud image.Through comparative analysis,it is shown that the cooling effect of the direct-ribbed radiator on the disc-type speed-regulating permanent magnet coupler studied in this paper is obvious,has the certain reference value for engineering. |
