SU1723628A1 - Stator of electric motor - Google Patents

Abstract

SUMMARY OF THE INVENTION: The stator comprises a magnetic core 6 assembled from sheets. The cooling fins 7 are located in the recesses 8 on the external surface of the magnetic circuit 6. The cooling fins 7 are welded to the magnetic conductor 6 by welds 9 fastening its sheets. 2 Il.

Description

FIG. 2

This invention relates to electric machines &, authority to open-frame designs of explosion-proof electric motors.

The purpose of the invention is to increase the quality of the stator by reducing the thermal deformation of the magnetic circuit and reducing the complexity of its manufacture.

Figure 1 shows the electric motor with the proposed stator, a general view; figure 2 - section aa in figure 1.

The electric motor (Fig. 1) contains a rotor 1 with a shaft 2, bearing shields 3, rings 4 with cooling fins 5 welded to them. Rings 4 match with the ends of the magnetic stator 6. To the outer surface of the magnetic circuit 6, the cooling fins 7, located in the recesses 8 for spr. Welding, rib 7, are welded to the magnetic conduit by welds 9, fastened with its sheets.

For a specific execution of an explosion-proof electric motor made on the basis of the AIM160 electric motor, the thickness and height of the cooling fins 7 are equal to 5 and 25 mm, respectively. The length of the ribs is chosen to be less than the distance between the rings mated to the ends of the stator magnetic circuit. For example, when the length of the stator magnetic circuit (packet) is 153 mm and the length of the mating of each ring, with a magnetic conductor of 18 mm, the length of the ribs is equal to 115 mm. The welding of the stator magnetic circuit 6 and the welding of four ribs 7 to it are carried out on commercially available semi-automatic machines for welding stator cores, for example, on semi-automatic devices CM22 or P2C-2. In this case, the welding semiautomatic device is additionally equipped with a mechanism for fixing and clamping the welded rib to the magnetic circuit. The welds 9 are produced by melting the metal of the splines in the recesses 8 and the metal of the rib 7. All are welded

stitches 9 at the same time. The number of fins welded to the rings is reduced compared to the prototype by the number of fins welded to the magnetic circuit, i.e. in this case, by four.

Thus, this technical solution makes it possible to increase labor productivity in the manufacture of electric motor stators by combining welding operations of a certain number of ribs, equal to the number of welds of the magnetic circuit, with the welding operation of the stator magnetic circuit. Welding the ribs to the stator magnetic circuit will significantly improve the heat sink of the electric motor by increasing the area of the outer surface of the magnetic circuit, from which heat is removed directly from the unpackaged electric motors. In addition, welding of the ribs to the outer surface of the magnetic core will increase its casteco by increasing the strength and solidity of the package.

The use of the invention does not lead to an increase in the welding deformations of the magnetic circuit, since the number of welds does not increase.

Claims (1)

Invention Formula The stator of an electric motor containing a magite line assembled from sheets, on the outer surface of which cooling fins are located, differs from the fact that, in order to improve the quality of the stator by reducing the thermal deformations of the magnetic circuit and reducing the complexity of its manufacture, grooves are made on the outer surface of the magnetic circuit the cooling fins and welds fastening the sheets of the magnetic cores are located, the cooling fins being welded to the magnetic conductor by the above-mentioned welds. Fiá.1