SU437176A1 - Electric machine stator core - Google Patents

Description

one

In large electric machines, in single-pack stator cores assembled from segments, to improve cooling, the heat transfer surface of the opal stator is made artificially developed. The development of the back of the stator core is achieved due to the protrusions on the outer surface of the segments, during assembly of which along the back of the core, longitudinal ribs are formed, between which cooling gas circulates in the axial channels. However, the cooling of the stator core from the back, despite the presence of longitudinal ribs, is not effective enough.

In order to intensify cooling, it is proposed to nest for tightening elements of segment packages asymmetrically to protrusions on the back, and separate segment packages to shift one relative to the other in the tangential direction so that spikes in staggered order or longitudinal serrated edges are formed on the back.

With this backrest design, the heat transfer coefficient from the surface is much higher than when washing the longitudinal ribs.

For use to assemble the core of identical segments, their tensioning elements are arranged symmetrically with the grooves and asymmetrically as the ridges on the back.

FIG. 1 shows a stator core segment; in fig. 2 - dorsal stator core in axonometry. Segment 1 has grooves for winding 2, protrusions on the back 3 and slots for tightening elements 4, which are symmetrically positioned on the grooves and asymmetrically on the protrusions on the back. The stator core is blended in such a way that, when shifting one relative to another, the individual packages in the tangential direction form discontinuous edges arranged in a checkerboard pattern or longitudinal serrated edges on the back surface.

15

Subject invention

The stator core of an electric machine, composed of segments with winding slots, jacks for tensioning elements, arranged symmetrically to the grooves, and protrusions in the form of teeth on the back surface, characterized in that, in order to increase cooling efficiency, the sockets are asymmetrically to the shoulders and the packets of the segments are shifted with one shift relative to the other in the tangential direction.

(Rig.1

FIG. 2