Analysis of the Influence of Wind Path Structure on the Cooling and Heat Dissipation Performance of Permanent Magnet Traction Motor with Self-ventilation Cooling Structure for Subway
In order to figure out the influence of typical external wind path structure on heat dissipation and noise of permanent magnet traction motor,this paper implements numerical analysis and experimental test on the flow,heat dissipation and aerodynamic noise of a 190 kW subway permanent magnet traction motor with different external wind path structures.On the premise of keeping the radial height of ventila-tion aperture of 15 mm unchanged,the average flow velocity increases and the flow rate decreases with the increase of ventilation holes from 48 to 60 and 72,Specifically,the flow rate of 72-hole scheme is 6.1%lower than that of 48-hole scheme,and the average flow velocity is 8%higher.On the premise of keeping the number of ventilation holes unchanged at 60,when the height of ventilation holes is 15 mm,16 mm and 17 mm respectively,the flow rate increases and the flow rate decreases with the in-crease of hole height.When the hole height is 17 mm,the flow rate increases by 3.6%and the average flow velocity decreases by 6.7%.As the maximum diameter of the fan increases from 280 mm to 320 mm,the aerodynamic noise only increases by about 2 dB(A),but the maximum temperature of the winding and the maximum temperature of the iron core decrease by more than 5 K.Therefore,it is sug-gested that the combination of parameters with large number of holes and low height should be selected as far as possible for stator ventilation holes under the premise of meeting the requirements of design and safety,and when the outer diameter of the fan is in the range of 280～320 mm,the fan should be select-ed as large as possible for better comprehensive performance.
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