LOW SPEED AND HIGH TORQUE ELECTRIC MOTOR OUTER ROTOR, ELECTRIC MOTOR AND RELATED CRANE

摘要

The invention discloses an outer rotor suitable for low speed high torque permanent magnet synchronous motor, a low speed high torque permanent magnet synchronous motor with such an outer rotor and a high torque crane directly driven by such a motor and using the outer rotor (rotor shell) of the motor as its hoisting reel. The outer rotor is comprised of a cylindrical rotor shell, wherein the permanent magnets are regularly arranged in both circumferential and axial directions, the two circumferential sides of the permanent magnets are in the shape of an oblique plane with inner chamfering shape. The length of the permanent magnet in the axial direction is between 30-95mm, and the thickness of the permanent magnet is between 8-18mm, the motor is provided with an outer rotor, and both ends of the rotor shell are fixedly provided with a fixing plates, the stator slot on the stator core is a pear-shaped slot, the right end of the central shaft is fixedly arranged on the right rigid support with the anti-rotation structure. The crane uses the rotor shell of the motor as a reel of the hoisting mechanism used for connecting and winding the wire rope of the hoisting mechanism. The invention is advantageous for reducing the harmonic torque, simplifying the structure, running stable, small vibration, low noise and low temperature, and capable of normal operation at low speed (ultra low speed) high torque.