Design And Temperature Rise Calculation Of350kW Permanent Magnet Propulsion Motor

As the core of the warship power, warship propulsion system is the guarantee of thewarship life. In recent years, along with the rare earth permanent magnetic material renewal,the rapidly development of permanent magnet synchronous motor has changed. Permanentmagnet synchronous motor has the advantages of simple structure, reliable operation, smallvolume, high power density, low noise and a series of features. The warship electricpropulsion system with the permanent magnet propulsion motor as the core componet aregradually replacing the traditional DC electric propulsion system and mechancial propulsionsystem. Therefore, the research on permanent magnet propulsion motor has become theresearch focus of domestic and foreign ship electric propulsion system. The temperature rise ofthe motor affects the motor performance, reliability and service life, so accurate calculationand analysis of temperature rise is very important for the permanent magnet propulsion motor.This dissertation is a corresponding system for350kW permanent magnet propulsion motorlaunches the research ship electric propulsion.Firstly, based on the proposed permanent magnet propulsion technology index of motorperformance of motor design, determine the electromagnetic load, motor parts maindimensions, and so on. And by using the finite element method on the design of prototype ofnumerical calculation of electromagnetic field, electromagnetic parameters of the prototypeare obtained including magnetic flux density distribution, no-load EMF, flux density in the airgap, and check the rationality of350kW permanent magnet propulsion motor electromagneticdesign plan.Secondly, The dissertation studied the various losses in operation. Using the finiteelement method, the key prototype stator core loss, rotor core loss and permanent magnet eddycurrent loss are calculated. These three loss with no load, rated load and rated load addingstandard sinusoidal current harmonic current power supply loss of variation is studied andsummarized. In addition, the different modes of magnetization on the stator core position isanalyzed, and the calculation method of winding copper loss and mechanical loss haveresearched.Finally, the three-dimensional model of the prototype is established. The basic theory of the steady-state temperature field is studied and some equivalent treatment of prototypecalculation model is made. Each part of heat generation rate, coefficient of thermalconductivity and cooling system of the channel coefficient of heat transfer are calculated. Thesteady state temperature field is calculated by the finite element method, and the temperaturedistribution in the prototype is obtained, the prototype of the highest temperature point isfound. The average temperature rise of each part of the prototype under different cooling watervelocity are calculated. This dissertation provides a certain reference value for the same typeof350kW permanent magnet propulsion motor design and optimization.