Design And Temperature Rise Calculation Of Permanent Magnet Propulsion Motor For 350kW Tank

With the rapid development of science and technology,military weaponry and equipment have opened a new development model.Tanks,as the main equipment of the army operations,must continuously improve their mobile performance to meet the development needs of the times.Electric propulsion system is the core of the tank.Permanent magnet synchronous motor(PMSM)has the characteristics of simple structure,reliable operation and high power density,which can supplement and even replace the traditional mechanical propulsion system.Therefore,the input of permanent magnet motor is increasing home and abroad.It has become a new trend to bring the permanent magnet motor to tank locomotives.At the same time,the temperature rise is an important performance of the motor,which affects the efficiency and life of the motor and so on.The reasonable temperature rise is an important basis for testing the rationality of the motor design.This thesis is about the electromagnetic design and temperature rise calculation of permanent magnet propulsion motor for tank.Firstly,the electromagnetic parameters of the permanent magnet propulsion motor are determined,including the electromagnetic load of the motor,the inside and outside diameters of the stator and rotor,and the size of the permanent magnet.The numerical calculation of electromagnetic field is worked out by relevant software and the parameters include the no-load electromotive force,the air gap magnetic density,the distribution of the magnetic force line and the efficiency map diagram.The electromagnetic design scheme is optimized by comparing electromagnetic parameters and performance requirements,so as to achieve the target requirements.Secondly,the losses of permanent magnet propulsion motor under no-load and load condition are studied,including stator core loss,stranded loss and solid loss.The finite element method is used to analyze the core loss,solid loss and the influence of the load capacity.And the harmonic current content on these two kinds of loss changes are studied respectively.It is found that the changes of magnetic density have a certain influence on the core loss through the analysis of the magnetic field in different typical positions of the stator.Moreover,the calculation accuracy of the stator core loss can be improved by the further decomposition of the magnetic field along the tangential and radial direction.Finally,the three-dimensional model of the permanent magnet propulsion motor is established and the basic theory of temperature field is studied.According to the characteristics of the three-dimensional model,the motor model part is treated equally.The heat generation rate,thermal conductivity and heat dissipation coefficient of the motor are calculated according to the loss of motor condition.The temperature field is calculated by Fluent software and the temperature rise distribution of the motor is obtained.The change trend of the motor temperature and the influence of different cooling water speeds on temperature rise of the motor are analyzed.