Rotor structure of asymmetric few-rare-earth-mixed permanent magnet motor

Abstract

The invention discloses a rotor structure of an asymmetric few-rare-earth-mixed permanent magnet motor. According to the rotor structure, a plurality of rectangular grooves are formed in a rotor in the vertical circumferential direction and are divided into an upper layer and a lower layer; magnetic tapes are formed between the upper layer and the lower layer; rectangular ferrite is embedded in each rectangular groove; symmetrical ox-horn-shaped grooves are formed in the left sides and the right sides of the bottom parts of the upper rectangular grooves and the upper parts of the lower rectangular grooves; convex grooves are formed in the positions, close to a rotating shaft, of the lower layer of the rectangular grooves; rectangular magnetic isolation grooves perpendicular to the axis direction of the rotor are formed in the bottoms of the rectangular grooves; rectangular magnetic isolation grooves and T-shaped magnetic isolation grooves are formed at the joints between the upper layer of the rectangular grooves and air gaps at intervals; V-shaped grooves are symmetrically formed in the left sides and the right sides of the T-shaped magnetic isolation grooves; linear grooves communicated with the rectangular grooves are formed in the left sides of the rectangular grooves; and neodymium-iron-boron permanent magnets are embedded in the sides, close to the ferrite, of the V-shaped grooves and the linear grooves. According to the rotor structure, the material cost of the permanent magnet motor is lowered, the torque characteristics are improved, the iron core and eddy currentloss are reduced, and the efficiency of the motor is improved.

Description

technical field [0001] The invention relates to a rotor structure of a permanent magnet motor, in particular to a rotor structure of an asymmetric mixed rare earth permanent magnet motor, belonging to the technical field of motors. Background technique [0002] Rare earth materials are widely used in industrial production such as motors. However, as non-renewable resources, rare earths have an unstable supply all year round, and their prices fluctuate greatly, which even triggers a rare earth crisis. Therefore, ferrite, which is cheap and easy to obtain raw materials, is used in motors instead of rare earth permanent magnets, which can alleviate the rare earth crisis. Since the magnetic properties of ferrite are much lower than that of rare earth materials, such as NdFeB, it is important to keep the motor performance such as output capacity unchanged through reasonable rotor design. The present invention aims at the above problems, and through the asymmetrical design of the...

AI Technical Summary

Problems solved by technology

Because the magnetic permeability of the iron core material is higher than that of air, the built-in permanent magnet will have a self-leakage phenomenon, the amplitude of the air-gap magnetic base wave will decrease, and the output capacity of the motor will decrease.

At the same time, due to the low coercive force and remanent magnetism of ferrite, irreversible demagnetization is very easy to occur under the action of armature reaction.

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