Research On Permanent-magnet Eds＆ems Hybrid Suspension System Based On Halbach Structure

With the advantages of low suspension energy consumption and simple structure, permanent-magnet EDS (short for Electro-dynamic Suspension) system has an extensive prospect in many areas like transportation, spaceflight and military. However, permanent-magnet EDS system is stable marginally which has the disadvantage of under-damped nature, and oscillations come out easily when the system is disturbed. Thus, a permanent-magnet EDS&EMS (short for Electro-magnetic Suspension) hybrid suspension system is studied. Based on the optimization of permanent-magnet EDS, electromagnetic active control is adopted to make up the under-damped nature of permanent-magnet EDS system. The main contents are as follows:1. With the missile-target encounter experiment as the background, an experimental vehicle scheme which adopts permanent-magnet EDS&EMS hybrid suspension system is proposed. The vehicle structure, track, suspension system and guidance system are introduced in principle.2. In order to improve the availability of magnets, and get higher magnetic induction intensity with less permanent-magnet material, the geometrical configuration of the linear Halbach permanent magnets array is optimized. Both advantages and disadvantages of the coil track and conducting sheet track are analyzed. Finally, t magnet parameters and track parameters of the experimental vehicle are designed.3. The linear model of the permanent-magnet EDS&EMS hybrid suspension system is established, and its stability is analyzed. The distribution between permanent magnet repulsive force and electro-magnetic force is analyzed. Based on this, two controllers are designed and simulation analysis is finished.4. A permanent-magnet EDS&EMS hybrid suspension system experimental platform is established for experimental research. Two permanent magnet arrays with different parameters are designed and manufactured, and one array is compared with the other according to their levitation force and drag force. It is proved by the dynamic performance experiments of the hybrid suspension system that the damping character of permanent-magnet EDS system can be improved through the introduction of electromagnetic active control.This dissertation does some exploratory researches on permanent-magnet EDS&EMS hybrid suspension system,and the rationality is validated through theoretical and experimental research methods.