High-speed motor self-circulating cooling structure and cooling method

The invention discloses a high-speed motor self-circulating cooling structure and a cooling method. The structure comprises a casing, a stator and a rotor. The casing is provided with a water inlet atone end in the axial direction, and a water outlet at the other end. A cooling structure is arranged between the casing and the stator, and the cooling structure comprises a first annular water channel and a second annular water channel. The first annular water channel communicates with the water inlet, and the second annular water channel communicates with the water outlet. A plurality of watercooling pipes are uniformly fixed between the opposite side walls of the first annular water channel and the second annular water channel to communicate the first annular water channel with the secondannular water channel. The stator is provided with a flow channel, of which the inlet communicates with the first annular water channel and the outlet communicates with the second annular water channel through a connection wat