Electromagnetic Characteristics of CRDM Model Based on Multiple Magnetic Circuit Coupling for Power Drive System

To solve the problem of large deviation of electromagnetic lifting mile calculation caused by oversimplification of the equivalent magnetic circuit model of the traditional magnetic lifting control rod drive mechanism (CRDM), this study adopts an equivalent magnetic circuit model of the magnetic lifting CRDM based on multi-magnetic circuit coupling, which takes into account the coupling influence between multiple coils on the basis of the traditional magnetic circuit model and establishes an equivalent magnetic circuit model of the whole drive mechanism. Considering the edge effect of the air-gap flux, the air-gap reluctance calculation formula is improved; the quantitative relationship between the reluctance other than the air-gap reluctance and the air-gap length is analyzed, and the loop equations are established based on the Kirchhoff's law of the magnetic circuit. The research results show that the improved equivalent magnetic circuit model substantially improves the calculation accuracy of electromagnetic lifting force. Therefore, the equivalent magnetic circuit model of CRDM for magnetic lifting based on multiple magnetic circuit coupling established in this study can be used for the calculation of electromagnetic lifting force.