RU116284U1 - ASYNCHRONOUS MOTOR ROTOR - Google Patents

Abstract

The proposal relates to the field of electrical engineering, in particular, to the design of induction motors, and is used in the assembly of the rotor. The rotor of an induction motor containing a shaft, sheets of electrical steel, and fasteners between sheets of electrical steel, made in the form of a film of polysulfide rubber with sulfide end SH-groups. The technical result of the proposed utility model is to reduce the manufacturing time of the rotor, increase its service life, reduce the amount of equipment used during its assembly, as well as reduce the amount of harmful substances emitted during the production of the rotor.

Description

The proposal relates to the field of electrical engineering, in particular, to the design of induction motors, and is used in the assembly of the rotor.

It is known that parts of the magnetic system that conduct alternating magnetic flux are assembled from thin sheets of electrical steel isolated from each other, which are fastened together in various ways:

1) cast aluminum

2) riveting

3) welding fastening

4) bonding by gluing. (Ivanov-Smolensky A.V. “Electric machines” Moscow, Energy, 1980, Antonov M.V. Technology for the production of electric machines. 2nd ed., Revised. And additional - M. Energoatomizdat, 1993).

Bonding sheets of electrical steel by gluing is cheaper than the other methods listed. Aluminum or glue located between the plates also acts as an insulator, which reduces eddy current loss and magnetization reversal in the cores.

The closest technical solution to the proposed one is utility model 99908 "Unwound rotor of an electric machine", authors Novoseltsev MS, Chernyavsky VI, Н02К 17/02, Н02К 1/26, published November 22, 2010. The technical result is achieved by the fact that in the rotor of an electric machine containing a shaft, a magnetically conductive core of sheet steel with grooves in the outer diameter region for winding the rotor, fasteners, end push elements and axial fasteners of the pressed core on the shaft, end push elements are made of sheets of a magnetic core, pre-assembled in bags, pressed and impregnated with an adhesive compound based on epoxy resins.

The disadvantage of this technical solution is the use of a compound based on epoxy resin, which does not provide sufficient mechanical strength of the core and the reliability of the electric machine. In addition, the use of a compound requires heat treatment of the collected packages. Heat treatment is carried out in several stages with a gradual increase in temperature. This procedure takes 20 hours. During heat treatment harmful substances are released that are hazardous to human health, therefore, special equipment is necessary to protect the employee from exposure to harmful substances during the assembly of such an engine.

The technical task is to create a rotor of an electric motor that increases its reliability.

The technical result of the utility model is to increase the mechanical strength of the rotor and its service life. In addition, the complexity of manufacturing the rotor is reduced and the amount of harmful substances released during the production of the rotor is reduced.

The proposal is illustrated by drawings, where

figure 1 shows the rotor of an induction motor,

figure 2 shows the connection of the sheets of electrical steel fasteners.

The rotor of the induction motor contains a shaft 1, on which a core 2 is assembled, consisting of sheets of electrical steel 3 with grooves (not shown in Fig.). The sheets of electrical steel 3 are fastened together by fasteners 4 and clamped by end pressure plates 5. In the pressed state, the core 2 with pressure plates 5 is held on the shaft 1 in the axial direction on one side by a collar 6, on the other - by a locking ring 7, also mounted on the shaft 1. The fastening elements 4 between the sheets of electrical steel 3 are made in the form of a film of polysulfide rubber with terminal sulfidryl SH-groups.

In the process, the rotor of the induction motor is rotationally driven by electromagnetic forces, the fasteners 4 provide a rigid connection of sheets of electrical steel 3 with each other and with the shaft 1.

Increasing the mechanical strength of the rotor is achieved due to the fact that fasteners in the form of a film of polysulfide rubber with terminal sulfidryl SH groups, due to their exceptional elasticity and the presence of polar groups, have high adhesion to various metals and nonmetallic materials. The ultimate tensile shear stress for such a film is not less than 38 MPa according to the test data. For comparison: a similar indicator for an adhesive epoxy compound is about 16 MPa.

In addition, the film is resistant to moisture, solvents, mineral oils and other aggressive environments, does not cause corrosion of metals, has good dielectric properties and exceptional resistance to thermal cycling. The use of the film eliminates the heat treatment of the rotor, which reduces the time and energy consumption in its manufacture. The film does not contain any solvents and does not emit toxic substances due to its ability to cure at room temperature.

Claims (1)

An asynchronous electric motor rotor comprising a shaft, a core on it made of sheets of electrical steel with grooves, and fasteners between sheets, characterized in that the fasteners between the sheets of electrical steel are made in the form of a polysulfide rubber film with SH sulfide end groups.