The Thermal Design Of Propulsion Motor On IMP

The Integrated Motor Propulsion(IMP)is a new type of propulsion.Using pod it integrates the propulsion motor and the propeller together.IMP makes full use of space and has no connect axes and has high reliability.The independent structure makes it convenient to construct and maintain.The stator and rotor of the propulsion motor are directly cooled by sea water without cooling system.IMP propulsion motors generally use high power density permanent magnet motors.Compared with conventional propulsion permanent magnet motors,it has some new requirements and features in terms of structure and performance.This paper refers to the relevant methods of the thermal design of permanent magnet motors,combined with the characteristics of IMP propulsion motors,using the finite volume method and the equivalent thermal method for thermal design-related research.Firstly,the classification and source of the loss in the propulsion motor are described.The ways and methods of heat transfer in the motor are introduced.In theory,the distribution of the loss and the heat transfer are correlated.Secondly,the related assumptions of the stator winding straight line segment and the end filling type were studied.The NX software was used to simulate the three-dimensional model of the motor.The simulation calculations were performed by changing the different boundary conditions,and the different ones were analyzed and compared.The effect of the effect type on the temperature rise results,and the corresponding use conditions are given,and the calculation method is clarified.Finally,the thermal calculation and thermal analysis were performed for IMP propulsion motors of 30 kW and 1 MW.The equivalent thermal circuit program was programmed using VBA software to calculate the temperature rise of the motor in two dimensions.The key factors influencing the temperature change were discussed and simulated.The results are summarized to obtain the influence of thermal parameters.