Structure for fixing magnetic poles of permanent magnet motor

The invention provides a structure for fixing the magnetic poles of a permanent magnet motor, belonging to the technical field of motors and solving the problem that the magnetic poles of the rotors of the inner rotor permanent magnet synchronous motors are positioned unstably. The structure comprises a rotating shaft and a rotor yoke, wherein the rotor yoke is sleeved on the excircle surface of the rotating shaft. The structure also comprises two circular ring-shaped rotor pressing plates, P-numbered magnetic poles and P-numbered positioning keys, wherein the two circular ring-shaped rotor pressing plates are respectively connected at the two ends of the rotor yoke fixedly and form grooves with the outer surface of the rotor yoke; the P-numbered positioning keys are uniformly distributed along the circumferential direction of the rotor and divide the grooves into P-numbered accommodating space along the axial direction of the rotor; and one magnetic pole is fixedly arranged in each accommodating space. The structure is suitable for positioning the magnetic poles of the inner rotor permanent magnet motors.