Ore grinding device with permanent magnet motor

The utility model discloses an ore grinding device with a permanent magnet motor, which comprises the permanent magnet motor and a moxa sand mill which are fixedly connected to a mounting frame, and an output shaft of the permanent magnet motor and a stirring shaft of the moxa sand mill are respectively mounted on a coupler through a first transmission key; the coupling is axially positioned and mounted between an output shaft of the permanent magnet motor and a stirring shaft of the moxa sand mill; the coupler comprises paired connecting mechanisms which are oppositely arranged, and each connecting mechanism comprises a connecting sleeve and a locking piece. The locking piece is used for axially and radially positioning the connecting sleeve matched with the locking piece respectively; the two oppositely-arranged locking pieces are detachably and fixedly connected. The device is simple and convenient to install, and the permanent magnet motor and the moxa sand mill main machine are easy to position. 本实用新型公开一