Research On Performance Of Oriented Silicon Steel Sheets Electromagnet Of Large Gap Magnetic Drive System

Abstract:Taking the large gap magnetic driving system as the way of energy supply for permanent magnet axial flow blood pump can conquer engineering and medical problems such as wear and infection and rejection brought by traditional driven approach effectively. However, There exists problems of high temperature rise and low efficiency of energy transmission when adopting T type none-oriented sicicon steel sheet as electromagnet core. silicon steel sheet,the medium of electromagnetics transduction in system, is changeable in physical property with different temperatures.The electromagnet field and temperature field affects and connects with each other.This paper foucused on the research of coupling field and electromagnet optimization to control temperature rise of electromagnet and enhance driving performance and power transmission efficiency of system as well.Electromagnetic material and structure optimization design was proposed. U type oriented silicon steel sheet was adopted as electromagnet core by comparing the driving torque and efficiency of energy transfer.The simulation was done by using Ansys to find out the driving torques of oriented silicon steel sheet with different directions and how the parameters of system affect upon driving torque. The finite element calculation model of electromagnet eddy and temperature field were derivated based on the basic theory of electromagnetism and thermal,obtaining temperature distribution of different times of electromagnet.Research shows that:The driving torque and efficiency of energy transmission produced by oriented silicon steel sheet is superior than none-oriented silicon steel sheet does, and U type electromagnet core is better than T type. The driving torque comes from silicon steel sheet with rolling direction is about3times of that with the direction of vertical rolling. The simulation that how different parameters affect driving torque was proofed right by the axial-flow blood pump load test with different occasions, and also, the simulation result that the electromagnet temperature under the circumstance of magnet-heat coupling was correct by measuring the temperature of electromagnet.