Motor slot wedge with sealing structure and combined device

Abstract

The invention provides a motor slot wedge with a sealing structure and a combined device, wherein the structure of the motor slot wedge is as follows: a groove is arranged on the outer wall of the slot wedge, a thermal expansion material is arranged in the groove, and the thermal expansion After the material is heated and expanded, it contacts the inner wall of the core slot. In the technical solution of the present invention, a sealing structure is formed between the slot wedge and the inner wall of the tooth groove of the iron core by providing grooves on the outer wall of the slot wedge and filling the thermal expansion material, preventing moisture from entering the teeth of the iron core. The interior of the groove breaks down the insulating structure and prevents varnish loss after vacuum pressure impregnation.

Description

technical field [0001] The invention relates to a motor slot wedge, in particular to a motor slot wedge with a sealing structure and a combined device of the motor iron core and the 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 insula...

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.

Images