Calculation of static characteristics of linear step motors forcontrol rod drives of nuclear reactors-an approximate approach

摘要

This paper describes an approximate method for calculating thestatic characteristics of linear step motors (LSM), being developed forcontrol rod drives (CRD) in large nuclear reactors. The staticcharacteristic of such a LSM which is given by the variation ofelectromagnetic force with armature displacement determines the motorperformance in its standing and dynamic modes. The approximate method ofcalculation of these characteristics is based on the permeance analysismethod applied to the phase magnetic circuit of LSM. This is a simple,fast and efficient analytical approach which gives satisfactory resultsfor small stator currents and weak iron saturation, typical to thestanding mode of operation of LSM. The method is validated by comparingtheoretical results with experimental ones