High-speed permanent magnet motor

The invention discloses a high-speed permanent magnet motor, comprising a motor shaft, a rotor which fixedly sleeves the motor shaft, a stator which rotationally sleeves the rotor, and a frame which covers the stator and the rotor. The motor shaft is rotationally connected to the frame. The gap between the rotor and the stator forms an air gap axial air duct. The frame is internally equipped witha closed-loop air duct, and the air gap axial air duct is a part of the closed-loop air duct. A fan is fixed on the motor shaft, and the fan is arranged on the closed-loop air duct to drive the air inthe closed-loop air duct to circulate. The fan is fixed directly on the motor shaft, and the fan will also rotate when the motor shaft rotates. In addition, the fan is arranged on the closed-loop airduct to form a totally closed self-circulation ventilating and cooling system, the closed-loop air duct passes through the rotor, and the fan drives the air in the closed-loop air duct to circulate to cool the rotor. The rotor