Failure Mechanism Analysis of Key Rotor Components in High-Speed Permanent Magnet Generators

Abstract

This study analyzes the failure mechanisms of the key rotor components of a high-speed permanent magnet generator, namely permanent magnets, sleeves, and backup bearings. For rotor permanent magnets, mechanical failure and magnetic performance failure are investigated, with emphasis on the magnetic failure mechanism under high temperature and reverse magnetic field. For rotor sleeves, starting from the viscoelastic mechanical properties of carbon fiber sleeve matrix materials, the evolution laws of composite stiffness and strength are studied, and the failure mechanism is analyzed based on experimental data. For rotor backup bearings, rotor dynamic simulation model and finite element calculation model are established to identify coating failure as the root cause of backup bearing failure, and the coating failure mechanism is analyzed.