Permanent magnet motor rotor structure and mounting method

Abstract

The invention discloses a permanent magnet motor rotor structure. The structure comprises a rotating shaft, a magnetic steel, a rotor iron core, magnetic steel fixing parts and a rotor sheath, wherein a through hole is formed at the center of the rotor core, the section of the rotor core is a regular polygon, and the periphery of the rotor iron core is provided with a magnetic isolation groove at the junction of the side edges. The magnetic steel fixing parts are partially injected into the magnetic isolation grooves, and the magnetic steel fixing parts are T-shaped; the magnetic steel is inserted into a cavity formed by the surfaces of every two adjacent T-shaped magnetic steel fixing parts and the surface of the rotor iron core, the rotating shaft is pressed into a central through hole of the rotor iron core, and the magnetic steel fixing parts further comprise side baffle rings arranged on the two sides of the rotor iron core; the rotor sheath is cylindrical, one side of the rotor sheath is provided with a closing opening which is preset to be closed up towards the circle center, and the closing opening is annular; the rotor core is sleeved by the rotor sheath, one side of the shell nosing is located on the shaft extension side, the other side of the rotor sheath is also folded towards the circle center, and the shell nosing is annular. The magnetic flux leakage rate is low, the materials are saved, and the working efficiency is high.

Description

technical field [0001] The invention relates to a permanent magnet motor rotor structure, which belongs to the field of motors. Background technique [0002] Most of the existing small permanent magnet motor rotors adopt the magnetic cylinder structure. Compared with the bow-shaped magnetic steel structure, the magnetic cylinder structure is more expensive. The outside of the magnetic cylinder is directly exposed in the air gap, and the debris generated by the rotor during operation Directly into the air gap of the motor, the motor is prone to noise. For rotors with surface-mounted magnetic steel, the rotor core generally uses dovetail grooves to fix the magnetic steel, and the magnetic resistance at the junction of the magnetic steel is very small, resulting in serious magnetic flux leakage. The straight sheath that is applied outside needs glue to fix, and its working procedure is complicated, and glue bonding is troublesome, and its quality is not stable. Contents of t...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing small permanent magnet motor rotors adopt the magnetic cylinder structure. Compared with the bow-shaped magnetic steel structure, the magnetic cylinder structure is more expensive. The outside of the magnetic cylinder is directly exposed in the air gap, and the debris generated by the rotor during operation Directly into the air gap of the motor, the motor is prone to noise

For rotors with surface-mounted magnetic steel, generally the rotor core will use dovetail grooves to fix the magnetic steel, and the magnetic resistance at the junction of the magnetic steel is very small, resulting in serious magnetic flux leakage

The straight sheath applied on the outside needs to be fixed by glue, the working procedure is complicated, the glue bonding is troublesome, and its quality is not stable

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