Motor permanent magnet fixing structure, motor permanent magnet fixing method and motor comprising the structure

Abstract

The invention provides a motor permanent magnet fixing structure, a motor permanent magnet fixing method and a motor comprising the structure. The motor permanent magnet fixing structure comprises a rotor iron core, a permanent magnet and a composite material layer, wherein the permanent magnet is covered on the outer surface of the rotor iron core, and the composite material layer comprises expanding fiber bundles arranged around the outer surface of the permanent magnet. The fixing method comprises the steps of: step 1, sizing and expanding fiber bundles to form expanding fiber bundles; step 2, winding a plurality of expanding fiber bundles on the outer surface of the permanent magnet to form a fiber pre-forming body; and step 3, forming a composite material layer on the fiber pre-forming body by using a resin film infusion molding process. According to the motor permanent magnet fixing structure, the motor permanent magnet fixing method and the motor comprising the structure, the problem in the prior art that a gap between the permanent magnet and a stator winding is too large to cause magnetic flux leakage as the thickness of a protection layer for protecting the permanent magnet is too great can be solved.

Description

technical field [0001] The invention relates to the field of motors, in particular to a motor permanent magnet fixing structure, a fixing method and a motor including the structure. Background technique [0002] At present, high-speed motors are widely used in the field of commercial air conditioners. However, due to the poor reliability of the rotor permanent magnets and the low tensile strength of the permanent magnets, the centrifugal force on the permanent magnets must be limited within a certain range, and the motor speed cannot be exceeded. High, the outer diameter of the rotor can not be too large. This has caused the existing high-speed motors to be difficult to meet the increasingly higher motor speed requirements of commercial air conditioners. In order to overcome this difficulty, it is necessary to take effective protection measures for the permanent magnets to increase the firmness of the permanent magnets. [0003] There are two existing measures to protect t...

AI Technical Summary

Problems solved by technology

Carbon fiber bundles are used to bind permanent magnets. Carbon fiber bundles cannot be piled up too thick, otherwise the gap between the stator and the rotor will be too large and magnetic flux leakage will occur. However, the protection of the two ends of the permanent magnet is relatively weak and easy to An accident where a permanent magnet was thrown out

The method of installing a protective cover to protect the permanent magnet cannot avoid the defect that the gap between the stator and the permanent magnet is too large, and the protection of the permanent magnet is not reliable enough. A large gap will increase the magnetic flux leakage coefficient and have an adverse effect on the efficiency of the motor.

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