Research on Critical Trigger Criterion of Multistage Synchronous Induction Coilgun

Multistage synchronous induction coilgun (MSSICG) has higher launch efficiency than other electromagnetic guns due to excellent noncontact propulsion characteristics. However, the feeding of the coil array must be synchronized with the movement of the projectile to accelerate the load smoothly. Researchers usually adopt tedious step-by-step debugging to achieve the matching of trigger timing and other structural parameters, but lack of detailed derivation and demonstration of critical trigger criterion. Therefore, starting from the optimal coupling position of single-stage launcher, this article proposes the critical trigger criterion. Then, the extended trigger criterion is modified by analyzing the simplified conditions and adjustable parameters of MSSICG with different structural forms. The research aims to provide reference for the parameter design of MSSICG.