Permanent magnet motor rotor and motor

Abstract

The invention discloses a permanent magnet motor rotor and a motor. The permanent magnet motor rotor comprises a rotor shaft, a rotor iron core, two magnetic poles and a sleeve, wherein the rotor ironcore sleeves the outside the rotor shaft, and a plurality of dovetail grooves are axially formed in the outer surface of the rotor iron core; the magnetic poles are respectively a north pole and a south pole and are symmetrically arranged on the outer surface of the rotor iron core, each magnetic pole comprises at least two permanent magnets, the cross sections of the permanent magnets are matched with the cross sections of the dovetail grooves, and the permanent magnets are embedded into the dovetail grooves; and the sleeve sleeves the periphery of the rotor iron core, and a gap between thesleeve and the rotor iron core is filled with epoxy resin. According to the permanent magnet motor rotor, the permanent magnets can be protected, and the good heat dissipation function of the permanent magnets and the good efficiency of the motor can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a permanent magnet motor rotor and a motor. Background technique [0002] The rotor of high-speed permanent magnet motor usually adopts sintered aluminum-iron-boron permanent magnet. The permanent magnet material can withstand relatively large compressive stress, but it can only withstand tensile stress below 100MPa, and its tensile strength is generally lower than one-tenth of the compressive strength. 1. Therefore, permanent magnets need protective measures to overcome the strong centrifugal force generated by high-speed rotating permanent magnets. The current method of protecting permanent magnets is to add high-strength non-magnetic protective sleeves outside the permanent magnets. The permanent magnets and protective sleeves use interference Cooperate, but the carbon fiber protective cover is a poor conductor of heat, which is not conducive to the heat dissipation of the perm...

AI Technical Summary

Problems solved by technology

[0002] The rotor of high-speed permanent magnet motor usually adopts sintered aluminum-iron-boron permanent magnet. The permanent magnet material can withstand relatively large compressive stress, but it can only withstand tensile stress below 100MPa, and its tensile strength is generally lower than one-tenth of the compressive strength. 1. Therefore, permanent magnets need protective measures to overcome the strong centrifugal force generated by high-speed rotating permanent magnets. The current method of protecting permanent magnets is to add high-strength non-magnetic protective sleeves outside the permanent magnets. The permanent magnets and protective sleeves use interference Cooperate, but the carbon fiber protective cover is a poor conductor of heat, which is not conducive to the heat dissipation of the permanent magnet, while the metal mesh protective cover has a good heat dissipation effect, but the metal mesh protective cover will produce eddy current loss and reduce the efficiency of the motor

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