For the surface-mounted high-speed permanent magnet motor rotor with glue filler,its permanent magnet is divided into blocks,and the filler between the magnetic poles is high-performance structural glue.The strength of the protective enclosure of this type of rotor was studied.The stress calculation formula of the protective sleeve was derived based on the theory of elastic mechanics,and the formula was verified by finite element method.At the same time,the influence of interference and speed on the strength of the protective sleeve was analyzed.The results show that the protective enclosure of the surface-mounted high-speed permanent magnet motor rotor with glue filler has sufficient mechanical strength at the rated speed and can meet the use requirements.