Study on the Rotor Strength of High-Speed Permanent Magnet Motor Considering the Influence of Assembly Pressing Force

In engineering application, the hot press assembly technology is often used to improve stability of rotor structure, but conventional design methods cannot effectively evaluate influence this process on strength, which easily causes strength exceed its safety margin range, and seriously it will lead failure structure. This paper takes cylindrical magnet surface-mounted high-speed permanent synchronous motor as research object. Firstly, pressing force stresses interference analyzed; then, comprehensively considering force, speed temperature, strength’s method with high structural proposed. Finally, based proposed method, a 100 kW/30,000 rpm designed, feasibility verified by over-speed experiment.