Multi-physics Field Calculation And Analysis Of The Marine Induction Motor

The shipping industry is highly rapid developed and its electric drive systemis significant. The motive power of electric drive system of normal ship comesfrom engine, induction motor is widely used in The electrochemical drag systemof the ship by its various merits. As a consequence of bad motor thermalenvironment in the cabin and the high density of motor power in shipping that thetemperature of the engine rise when operating. temperature plays a significantrole on the engine either operated safely or not. Therefore it is necessary ofcalculating the Marine induction motor fluid field、 temperature field and Thethermal stress field and Analysis of physical properties.Take an Y2-250M-4、55kW totally enclosed fan cooled motor for example,deeply analysis the fluid control equation, build up the physical model of fluidfield calculating after making a basic assumption of fluid and ensuring theboundary conditions then doing the calculating and analsysing we obtained thespecific distribution characteristics of the flowing fluid. Then make sure theequation of the steady state heat conduction in thermodynamics and based on theassumption upon the basis assumption build up the whole domain physical model,ensure the board line conditions and calculate the distribution characteristics ofwhole temperature rise of the motor, after that deeply research the consequenceand contrast the result with the data from the experience testifying the way ofcalculating is right. Finally based on the calculation of temperature field servethe temperature of each discrete nodes from temperature field as loads of thermalstress then on the base of fifteen equilibrium differential equations from elasticmechanics conduct the calculation and analysis of the thermal stress field.From the calculation and analysis we can know that the wind speed on the face of chassis is between12-20m/s and axial direction reduces approximate5m/s. The temperature of winding and the rotor rise highly; junction box andfooting play an great affection on the distribution of temperature; the deformationof the fan side end cover and the winding overhang is serious. Conducting bar forradial, the top of the thermal stress is the largest.