Insulated end cover for electric motor and generator

Abstract

The invention relates to an insulated end cover for an electric motor and a generator, which consists of a rolling bearing connected to a main shaft of the electric motor or the generator, an inner bearing end cover, an outer bearing retainer, an outer bearing end cover and a bearing pedestal fixedly connected to a engine base of the motor. The radial direction and the axial direction of an outerring of the rolling bearing are provided with insulating sleeves; and each insulating sleeve comprises a sleeve body and an insulating layer covered on the sleeve body. The insulated end cover adoptsthe technical scheme that: the radial direction and the axial direction of the outer ring of the rolling bearing are provided with the insulating sleeves; and the outer bearing end cover and the outer bearing retainer are matched and combined mutually to form labyrinth seal. The insulated end cover overcomes the defects that: the conventional insulated rolling bearing has high production cost, high price, serious electric erosion and brittle insulation coating; when the bearing is used or assembled and disassembled, the conventional insulated rolling bearing is easy to cause damage to the surface of the insulating layer; the ceramic material is easy to absorb moisture so as to easily cause insulation failure and the like. The insulated end cover of the invention is suitable to be used as the insulated end cover for various electric motors and generators, and is particularly suitable to be used on a wind driven generator or a variable-frequency motor.

Description

technical field [0001] The invention relates to an insulating end cover for electric motors and generators. Background technique [0002] In the design of existing motors or generators, in order to avoid shaft current damage to rolling bearings, the main types of shaft current protection for rolling bearings are: ①insulated rolling bearings; ②insulated end covers. [0003] Since the end of the 1990s, domestic and foreign bearing companies (such as SKF, NKE, ZWZ, Luozhou, etc.) have successively developed insulated rolling bearings, which are directly on the outer diameter of the bearing's outer ring and both ends or the inner ring. The inner diameter and both ends are coated with a layer of ceramic material. The insulated rolling bearing has the following electrical insulation properties: under 1000V direct current (DC), the minimum insulation resistance of the coating is 50MΩ, and the breakdown voltage can reach 3000V direct current (DC). However, the disadvantages of the...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the insulated rolling bearing are: 1. The manufacturing cost of the bearing is high and the price is expensive; 2. Due to the brittleness of the coating, the surface of the insulating layer is easily damaged during use or disassembly of the bearing, and the ceramic material is easy to absorb moisture. , prone to insulation failure

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