3-dimensional Analysis of a Lift-Magnet for MAGLEV

도시형 자기부상열차용 부상 전자석의 3차원 해석

Magnetic path direction in the back-iron of a linear induction motor(LIM) is perpendicular to that of the lift-magnet of the MAGLEV which is recently developing in KOREA. In general the back-iron is isolated magnetically in conventional rail in order to eliminate the thrust dependency of the LIM on the lift force. However the magnetic isolation causes some increase in construction and management cost. So a unit-type rail system is considered, which the magnetic circuit of the back-iron is sharing that of the lift-magnet. In this paper 3-dimensional analysis for the lift-magnet is carried out using finite element method. As a result, a new shape of the unit-type rail is presented to reduce the magnetic dependency between thrust force and lift force. Also the distribution of magnetic flux density vectors and current-lift force characteristics are presented.