Application Of MOSFET In Motor Controller Of Motor Vehicle

With the rise of the new energy industry,new energy vehicles are experiencing unprecedented development.Pure electric vehicles in new energy vehicles are the most popular.Pure electric vehicles mainly rely on its three-power system to replace the traditional fuel engine system.The motor controller is the most important component.This paper mainly discusses the application of MetalOxide-Semiconductor Field Effect Transistor(MOSFET)in the main part of power inverter through the research of motor controller(induction motor).The structure,static characteristics,switching characteristics and important parameters of MOSFET are analyzed in detail.At the same time,it also summarizes how to select MOSFET and how to drive MOSFET better,and gives the specific calculation method of driving peak current,driving power and the problems that should be paid attention to in the MOSFET parallel drive.This paper judges the reliability of MOSFET from the service life of it,summarizes the MOSFET failure mode during normal use and improper use.The service life model of MOSFET was built by means of failure mechanism and the degradation of sensitive parameters,and the specific experimental method of life predictionwas given.The hardware system of 3KW motor controller is designed,and the hardware evaluation and analysis of the controller are carried out.The test of the simulated load,the test of temperature rise and the test of the external characteristics of the motor are tested.Finally,the paper summarizes the thesis,points out the existing problems in this paper,and puts forward the direction that should be tried in the future.