Research on trigger control of multi-stage induction coil gun based on photoelectric sensing and trajectory observation

The coupling between coils and armature of the multi-stage synchronous induction coil gun changes with their relative positions, which makes it a great challenge to control the coil gun to achieve large energy level and high speed output. In this paper a 30-stage synchronous induction coil launch detection control system is designed, and analyzed, the positioning and speed measurement is tested and simulated during the launch process. Black and white stripes were arranged on the emitter, and photoelectric sensors were arranged between the coil stages. The photoelectric sensor detected the output position of the fringe by orthogonal coding, which can be converted into the emitter position. A Luenberger observer was constructed to observe the velocity of the launcher, and an observer frequency analysis method was constructed. The observation frequency of 267 Hz is the most suitable for the current system. The research of this paper was verified by the 30 stage coil launch test. The launch end speed reaches 210 m/s, and the efficiency of the whole device reaches 34. 7% . It shows that the photoelectric sensor and trajectory observation method proposed in this paper can be effectively used in the trigger control of multistage coil gun, and can meet the application scenarios of high speed and acceleration. © 2022 Editorial Department of Electric Machines and Control. All rights reserved.