METHOD FOR PRODUCING A SHORT-CIRCUITING RING

Abstract

The invention relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing material strips (2) from a metallic material; b) vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strips (2), and vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; c) stacking the rings (3, 31, 32) such that the cut-outs (5) of all disk-shaped rings (3, 31, 32) are disposed in mutual alignment; d) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

The invention furthermore relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing a material strip (2) from a metallic material; b) vertically edge-rolling the material strip (2) so as to form a helix (4); separating the metal strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strip (2); vertically edge-rolling the material strip (2) so as to form a helix (4); and separating the material strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); c) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

Claims

1. Method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing material strips (2) from a metallic material; b) vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strips (2), and vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; c) stacking the rings (3, 31, 32) such that the cut-outs (5) of all disk-shaped rings (3, 31, 32) are disposed in mutual alignment; d) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

2. Method according to claim 1, characterized in that, upon vertical edge-rolling of the material strips (2), the two ends (21, 22) of each material strip (2) are welded such that closed disk-shaped rings (32) are formed.

3. Method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing a material strip (2) from a metallic material; b) vertically edge-rolling the material strip (2) so as to form a helix (4); separating the metal strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strip (2); vertically edge-rolling the material strip (2) so as to form a helix (4); and separating the material strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); c) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

4. Method according to claim 3, characterized in that upon separating the material strip (2) into a plurality of portions, the two ends of each portion are welded such that closed disk-shaped rings (32) are formed from the open disk-shaped rings (31).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Exemplary embodiments of the invention will be explained in more detail by means of the schematic drawings in which:

[0042] FIG. 1 shows a material strip;

[0043] FIG. 2 shows an open disk-shaped ring having cut-outs;

[0044] FIG. 3 shows a closed disk-shaped ring having cut-outs;

[0045] FIG. 4 shows a short-circuiting ring that has been produced according to the first method;

[0046] FIG. 5 shows a further short-circuiting ring that has been produced according to the first method;

[0047] FIG. 6 shows a helix from a vertically edge-rolled material strip; and

[0048] FIG. 7 shows a short-circuiting ring that has been produced according to the second method.

DETAILED DESCRIPTION

[0049] Equivalent parts are provided with the same reference signs in all figures.

[0050] FIG. 1 schematically shows a material strip 2 having the length L, the width B, and the thickness s. In the view illustrated, in each case one upper side 23, one longitudinal side 24, and one end side 25 of the material strip 2 are visible. The two end sides 25 form the two ends 21 and 22 of the material strip. Instead of the rectangular cross section, the material strip can alternatively also have a trapezoidal or wedge-shaped cross section. The thickness s in this instance would vary continuously along the width B.

[0051] FIG. 2 schematically shows an open disk-shaped ring 31 which by means of the vertical edge-rolling has been shaped from a material strip according to FIG. 1. The material strip has been bent by approx. 360?, such that the two ends 21 and 22 of the material strip 2 are mutually opposite. The disk-shaped ring 31 furthermore has cut-outs 5 such as are present once the method step b) of the first method according to the invention has been carried out.

[0052] FIG. 3 schematically shows a closed disk-shaped ring 32. Such a closed ring 32 is formed from an open ring 31 according to FIG. 2 in that the two ends 21 and 22 of the material strip are welded to one another. A weld seam 26 can be seen.

[0053] FIG. 4 schematically shows a short-circuiting ring 1 which has been produced by means of the first method according to the invention. In the case of the short-circuiting ring 1 illustrated, four open disk-shaped rings 31 according to FIG. 2 have been assembled so as to form a stack and been bundled by welding. The respective ends 21 and 22 of the material strips 2 are opposite one another in pairs. The four open disk-shaped rings 31 have been stacked such that the ends 21 and 22 of the material strips 2 are in each case positioned so as to be in the identical position in relation to the circumferential direction of the disk-shaped rings 31. The short-circuiting ring 1 furthermore has cut-outs 5.

[0054] FIG. 5 schematically shows a short-circuiting ring 1 in an embodiment that is modified in relation to that of the short-circuiting ring 1 illustrated in FIG. 4. The second open disk-shaped ring 31 in relation to the first open disk-shaped ring 31 has been rotated by 72? in the clockwise direction. The third open disk-shaped ring 31 in relation to the first open disk-shaped ring 31 has been rotated by 180? in the clockwise direction. The fourth open disk-shaped ring 31 in relation to the first open disk-shaped ring 31 has been rotated by 252? in the clockwise direction. On account of the rotation of the disk-shaped rings 31, the ends 21 and 22 of the material strips 2 have been distributed across the circumference of the short-circuiting ring 1. An embodiment of the short-circuiting ring 1 that is particularly stable in mechanical terms thus results.

[0055] FIG. 6 schematically shows a helix 4 from a vertically edge-rolled material strip 2 according to FIG. 1. The helix 4 has four tiers 41. One end 22 of the material strip 2 can be seen at the visible end side 42 of the helix 4. The end 22 of the material strip 2 forms a step 43 on the end face 42 of the helix 4. The helix 4 that is illustrated in FIG. 6 corresponds to a state in which the vertical edge-rolling according to the method step b) of the second method according to the invention has already been carried out, but in which the separating of the material strip 2 into a plurality of portions, and the punching of cut-outs 5, has not yet been carried out.

[0056] FIG. 7 schematically shows a short-circuiting ring 1 which has been produced by means of the second method according to the invention. The helix 4 that is illustrated in FIG. 6 herein by a separation process has been disintegrated into portions in such a manner that disk-shaped rings 3 have been formed from the individual tiers 41 of the helix. The respective mutually opposite ends of the portions have been welded to one another such that closed disk-shaped rings 32 have been formed. A weld seam 26 can be seen. The end side 42 of the helix 4 as per this method step does not have any step. The short-circuiting ring 1 furthermore has cut-outs 5.

LIST OF REFERENCE SIGNS

[0057] 1 Short-circuiting ring

[0058] 2 Material strip

[0059] 21 End of the material strip

[0060] 22 End of the material strip

[0061] 23 Upper side of the material strip

[0062] 24 Longitudinal side of the material strip

[0063] 25 End side of the material strip

[0064] 26 Weld seam

[0065] 3 Disk-shaped ring

[0066] 31 Open disk-shaped ring

[0067] 32 Closed disk-shaped ring

[0068] 4 Helix

[0069] 41 Tier of the helix

[0070] 42 End side of the helix

[0071] 43 Step

[0072] 5 Cut-out

[0073] L Length of the material strip

[0074] B Width of the material strip

[0075] s Thickness of the material strip