Spindle motor with cooling structure

The utility model provides a main shaft motor with a cooling structure. The device comprises a shell, a squirrel-cage motor, a chuck and a cooling sleeve, the shell is divided into a motor mounting part and a driving mounting part; a plurality of first cooling channels are formed in the side wall of the drive installation part, a plurality of cooling grooves are formed in the outer wall of the cooling sleeve, the cooling sleeve is arranged in the motor installation part, the cooling grooves and the inner wall of the motor installation part form sealed second cooling channels, and the second cooling channels are communicated with the first cooling channels. According to the utility model, the cooling sleeve is adopted; during use, only the cooling sleeve needs to be arranged in the motor mounting part; the cooling groove in the cooling sleeve and the inner wall of the motor mounting part form a second cooling channel; compared with an existing cooling structure, the cooling structure has the advantages of bein