This paper studies motor structures and optimization methods for space robots, proposing an optimized stepped rotor bearingless switched reluctance motor (BLSRM) to solve the poor self-starting ability and significant torque fluctuation issues in traditional BLSRMs. Firstly, the advantages and disadvantages of the 12/14 hybrid stator pole type BLSRM were analyzed, and a stepped rotor BLSRM structure was designed. Secondly, the particle swarm optimization (PSO) algorithm was improved and combined with finite element analysis for motor structure parameter optimization. Subsequently, a performance analysis of the original and new motors was conducted using finite element analysis software, and the results showed that the stepped rotor BLSRM had an improved self-starting ability and significantly reduced torque fluctuation, verifying the effectiveness of the proposed motor structure and optimization method.

In order to predict the ballistic limit of ceramic/ UHMWPE composite protection, a theoretical model of ceramic/UHMWPE composite protection for projectile was established based on A-T model and fiber energy dissipation model. In the ballistic impact process, the fragments will experience ceramic dwell, ceramic fragmentation and fiber layer energy dissipation. The theoretical model obtained is compared with the experimental and simulation results. The results show that the residual velocity obtained by the theoretical model is in good agreement with the experimental and simulation results, and it can be applied to ceramic/UHMWPE composite protection of projectile penetration to a certain extent.