The static thrust calculation of a Hybrid-type LPM calculated by the Coenergy Method

자기(磁氣) 수반(隋伴)에너지를 이용한 Hybrid형 LPM의 정추력(定推力) 계산(計算)

This paper presents the static thrust of a hybid-type LPM by coenergy method. First, the nonlinealities of the permanent magnet, the primary core and the secondary are interpolated by the cubic spline method. Then the equivalent magnetic circuit including airgap reluctance, which is a function of displacement, modelled by the permeance method is obtained. From the derivative of coenergy with displacement computed by Newton Raphson method, the static thrust is calculated at each displacement with certain exciting current.