Temperature Prediction And Cooling Structure Optimization Of Explosion-Proof High Voltage Water-Cooled Double Speed Motor

Coal mine conveying equipment requires high overload capacity,high reliability and stable operation at different rotating speeds.Explosion-proof high-voltage water-cooled two-speed asynchronous motor perfectly meets the above conditions,and can eliminate the reducer and other deceleration links,has the advantage of saving economic cost,and is increasingly widely used.Because the heat dissipation performance of the motor is directly related to the safe operation of the motor and power system.Therefore,the research on the temperature rise and heat dissipation of this kind of motor becomes particularly important.In this thesis,an explosion-proof high-voltage water-cooled two-speed motor used in coal mine conveyor with 200/400 k W and 750/1500 rpm is taken as an example.according to its structure,characteristics,cooling type and heat transfer characteristics of global network fluid flow and heat transfer model is established,each part of the Motor thermal resistance calculation formula is given,and the Motor-CAD software for calculating the temperature rise of the Motor parts,and two speed Motor are calculated respectively under transient and steady-state of the stator winding,chassis and water jacket part such as outlet temperature,and through with the experimental verification,to prove the validity of the calculation method.It is concluded that the thermal circuit method has the advantages of high precision,fast calculation speed and easy programming,and can be used for temperature prediction and thermal analysis of this kind of motor.In this basis,the influence of different water flow rate on the cooling effect of the motor is analyzed,and the reasonable water flow rate is given to achieve the purpose of energy saving and environmental protection.The optimal design of cooling water jacket was carried out,and the influence of different number of waterchannels on heat dissipation was compared and analyzed.The influence of existing water jacket and circumferential spiral channel on temperature rise was compared and analyzed,and the temperature rise of motor with different width of water channel was calculated.Finally,the heat transfer coefficient and flow resistance of each part under various water cooling conditions are comprehensively analyzed,and the optimal structure of the water cooling system is given.In this paper,the optimized calculation method of motor housing water jacket and motor temperature rise can provide reference for similar asynchronous motor cooling system design and motor temperature rise research.