Analysis of Electromagnetic Force of Linear Induction Motor with Segmented Power Supply for Electromagnetic Emission

This paper introduces a linear induction motor with segmented power supply, which transforms the electric energy into the kinetic energy of the load movement in electromagnetic launch system. Based on the characteristics of electromagnetic emission mode, a special electromagnetic force analysis method of the motor is proposed. Firstly, considering secondary edge leakage, based on the principle of port equivalence, the equivalent circuit model is modified, and the calculation method of normal electromagnetic force of linear induction motor which is suitable for aperiodic transient operation in electromagnetic emission situation is analyzed. The accuracy of the method is verified by the finite element software. Secondly, combined with the kinematic model of Newton's second law, the relationship between the magnitude of electromagnetic force and the time of the stator in each section of the motor in the launching process is analyzed in detail, which lays the foundation for the dynamic response analysis and structural optimization design of the subsequent launching device.