Motor iron core with sealing structure and combination device

Abstract

The invention provides a motor iron core with a sealing structure and a combination device. A structure of the motor iron core is that the internal wall at the bottom of a notch of an iron core tooth groove is in a stair shape; thermal expansion materials are abutted to the surface of a lower layer stair; the thickness of the expansion materials is higher than the altitude difference between the lower layer stair and an upper layer stair. According to the technical scheme, the internal wall at the bottom of a notch of the iron core tooth groove is machined to be in the stair shape, the thermal expansion materials are arranged at the stair positions, then a sealing structure is formed between the slot wedge and the internal wall of the tooth groove of the iron core, moisture is prevented from entering into the interior of the tooth grove of the iron core and damaging an insulating structure, and paint loss after vacuum pressure impregnation is blocked.

Description

technical field [0001] The invention relates to a motor core, in particular to a motor core with a sealing structure and a combination device of the motor core and a slot wedge. Background technique [0002] 1. Description of the insulation structure of the motor and the structure of the slot wedge [0003] In the production process of the motor, it is necessary to open slots on the iron core of the stator or rotor, and arrange coils in the slots, and then install various shapes of slot wedges on the slots of the slots to fix the coils in the slots. Commonly used materials for making slot wedges are: 3020-3023 (the number is the type of insulating material) phenolic laminated cardboard; bamboo (after insulation treatment, reaching insulation grade E); 3230 phenolic laminated glass cloth board, 3231 aniline phenolic Laminated glass cloth board (after insulation treatment, reach insulation grade B); 3240 epoxy phenolic laminated glass cloth board (after insulation treatment, ...

AI Technical Summary

Problems solved by technology

[0004] 2. Technical description and existing defects of varnish insulation treatment

It not only affects the loss of paint, but also affects the amount of paint hanging on the inner and outer surfaces of the second dipped paint core

The amount of paint hanging is small, so there is no need to scrape the paint, but the loss of paint will inevitably cause gaps between the insulation in the tank, resulting in hidden dangers of water ingress and moisture inhalation that will damage the insulation

[0007] However, the slot wedge structure of the prior art does not have effective sealing measures, although it is conducive to the entry of paint, it cannot prevent the loss of paint when dripping paint

[0008] 3. Insulation defects caused by thermal expansion of the existing slot wedge and slot insulating porous medium

[0012] 4. Defect analysis of existing slot wedges

[0014] 1) The internal contradiction shown in the vacuum pressure impregnation process has shown that although the existing slot wedge structure is conducive to the entry of paint, it cannot prevent the loss of paint along the existing slot wedge when the paint is dripped after the first dipping

[0015] 2) In the prior art, when slot wedges are used to fix the coils in the tooth slots, since the tooth laminations of the core slot and the slot wedge are made of different materials, the elastic modulus differs greatly. The interface of the bonding layer formed by insulating varnish (or glue) between the tooth laminations will appear "debonding", moisture and water will naturally enter the groove to destroy the insulation, and even the loss of damaged medium (liquid)

However, this technique cannot ensure that the bonding layer interface between the slot wedge and the iron core slot is firm, and cannot prevent moisture and water from naturally entering the slot along the bonding layer fracture gap to damage the insulation.

And this technology is used in wind turbines in the natural environment. A large number of flocs and ferromagnetic substances appear around the surface of the magnetic slot wedge material, and even block the air gap and damage the insulation between the stator and rotor.

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