High-speed permanent-magnet variable-frequency motor

A high-speed permanent-magnet variable-frequency motor comprises a motor base, a stator, a rotor, a rotating shaft and two end covers, the rotor is arranged on the rotating shaft, the stator is arranged in the motor base, the rotor is installed in the stator in a matched mode, the end covers are arranged at the two ends of the motor base, bearing assemblies are arranged in the end covers, and the rotating shaft is rotationally connected with the end covers through the bearing assemblies. The bearing assembly located at the shaft extension end of the rotating shaft is arranged in a double-bearing mode, the end cover located at the shaft extension end of the rotating shaft is provided with a plurality of grooves which are distributed in a circumferential radial mode, the outer ring of each groove is provided with a plurality of exhaust holes which are distributed in a circumferential mode, and the exhaust holes are communicated with the grooves. Therefore, when the motor is matched with the centrifugal fan for