Research On End Loss And Temperature Rise Of High-Speed Canned Induction Motor

High speed canned induction motor is mainly used in medical,chemical and other fields where corrosive and radioactive media need to be transmitted.Different from the ordinary high speed induction motor,the high speed canned induction motor introduces the physical can structure and the end support structure.With the addition of new structures,the end structure of this kind of motor is complicated and the loss is various.The accurate analysis of the magnetothermal problem becomes the key to the electromagnetic design of this kind of motors.The research object of this paper is a 1.5MW high-speed canned induction motor.Combined with the basic theories of electromagnetic field and temperature field,the leakage magnetic field,circulating current loss,eddy current loss and temperature rise at the end of the high-speed motor are studied around the high frequency characteristics and new losses.The accurate calculation of the end loss depends on the accurate simulation of the end magnetic field.By establishing the mathematical model and physical model of the high-speed canned induction motor,the finite element method and the corresponding fourier decomposition program are used to solve the magnetic field at the end of the high-speed canned induction motor,and the distribution law of the magnetic field and the air gap magnetic field of each structural component at the end of the high-speed canned induction motor is given.The influence of the new structure on the air gap magnetic field distribution is discussed.The cutting magnetic field of the end structural parts will not only induce its own eddy current,but also generate circulating current between the end structural parts.The eddy current loss of the end parts and the circulating current loss between the parts are given by finite element method.The eddy current path of the end parts and the circulating current path between the parts are also given.The effects of material properties and high frequency characteristics on the loss and path of the end structure of high speed canned induction motor are discussed.In order to solve the problem of high end loss of high speed canned induction motor,a barrier device which can effectively reduce the circulating current loss between the end components was proposed.Aiming at the problems of high end loss and difficult heat dissipation of high speed canned induction motor,based on the study of end loss and the basic theory of temperature field calculation,the temperature field model of high speed canned induction motor was given,and the corresponding parameters required for temperature field calculation were calculated,and the temperature distribution of each structural part of the end was given.The temperature rise of each structural part of the end of the high-speed canned induction motor was given after the optimization of the structure was added.