Abstract
In engineering application, the hot press assembly technology is often used to improve the stability of the rotor structure, but the conventional design methods cannot effectively evaluate the influence of this process on the rotor strength, which easily causes the rotor strength to exceed its safety margin range, and seriously it will lead to the failure of the rotor structure. This paper takes the cylindrical magnet surface-mounted high-speed permanent magnet synchronous motor rotor as the research object. Firstly, the influence of the assembly pressing force on the rotor stresses and interference is analyzed; then, comprehensively considering the assembly pressing force, speed and temperature, the rotor strength’s design method with high structural stability is proposed. Finally, based on the proposed method, the rotor strength of a 100 kW/30,000 rpm high-speed motor is designed, and the feasibility of the design is verified by over-speed experiment.
Highlights
Permanent magnet synchronous motor has the advantages of small volume, high efficiency, and high power density, and is widely used high-speed motor, such as centrifugal compressors, air compressors, blowers and flywheel energy storage systems
If the interference is too small, the sleeve will loosen at high speed, and the permanent magnet is damaged by centrifugal force; if the interference is too large, the sleeve stress will exceed its maximum allowable stress, and there is a problem of assembly difficultly
In order to ensure design’s accuracy and reliability of the rotor strength, the assembly pressing force must be included in advance
Summary
Permanent magnet synchronous motor has the advantages of small volume, high efficiency, and high power density, and is widely used high-speed motor, such as centrifugal compressors, air compressors, blowers and flywheel energy storage systems. For designing the method of coupling electromagnetic and mechanical is proposed in [10] for designing kW/40,000 rpm high-speed permanent magnet motor, and the author designed the the 200 kW/40,000 rpm high-speed permanent magnet motor, and the author designed minimum sleeve thickness of Inconel andand. As the mounted high-speed permanent magnet synchronous motor rotor (Figure 1) as the research research object the to study the rotor strength’s designconsidering method considering the of influence of object to study rotor strength’s design method the influence assembly assemblyforce pressing force the assembly hot press technology assembly technology which pressing caused bycaused the hotby press (Figure 2),(Figure which 2), includes includes theofimpact of assembly on the interference thestresses, rotor stresses, the impact assembly pressingpressing force onforce the interference and theand rotor while while taking into account the influences of speed, temperature rise and interference on taking into account the influences of speed, temperature rise and interference on the the rotor strength
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