DE2814062A1 - STAND ARRANGEMENT OF A HOUSELESS ELECTRIC MOTOR - Google Patents

Description

28U062

SIEMENS AKTIENGESELLSCHAFT Our symbol Berlin and Munich VPA 78 ρ 3 0 5 8 BRD

Stand arrangement of a frameless electric motor

The invention relates to a stator arrangement of an electric motor without a housing with an upsetting punch In a cold forming process, sheet metal packs that are precisely compressed to size and shape.

In a known method (DE-AS 23 44 193) for production such a stator arrangement is provided that the stator laminations firmly connected to one another existing stator blank pre-planed and with bevels on the edges of its bore and its jacket is provided and is expanded and compressed into a dimensionally and dimensionally accurate stator by cold forming; the Upsetting punches are provided with a protruding outer edge on their facing end faces, in such a way that the laminated core formed by the chipless upsetting process has a circumferential one on the two end faces Has annular cultivation area.

Bk 2 Bim / March 28, 1978

909841/0166

vi 28H062

- t - VPA 78 P 3 O 5 8 BRD

DE-PS 844 616 also provides a stand arrangement a frameless electric motor known, with its laminated core instead of a centering edge to be turned off individual centering points are created in that reinforced and after the assembly of the Laminated core, plane-parallel ground end sheets, recesses in the form of cutouts are punched, engage in the pressed-in projections on the end shields and thereby fasten the end faces on the laminated core Bring the end shields into a position that is axially concentric to the hole in the laminated core.

The object of the present invention is to provide the structure of a stator arrangement for an electric motor without a housing with its end shields attached to the laminated core in terms of manufacturing and assembly technology.

This object is achieved according to the invention in a stand arrangement of the type mentioned at the outset possible that the laminated core only with axially pressed in directly on the end face by the upsetting punch, on Perimeter distributed point-like impressions with such stop surfaces for corresponding, on the bearing shields molded contact surfaces is provided that the end shields are at least plane-parallel to one another on Laminated core are attached.

The method according to the invention makes it possible in a simple manner, for example in one operation four round punches each attacking the two end faces of the pre-strengthened laminated core, four point-like each Impressions axially to be pressed into the laminated core, so that the base of the impressions of the one Face to those of the other face have a constant axial distance, so that stop

90BS41 / 0166

- 28U062

- * - VPA 78 P 3 0 58 FRG

areas for corresponding, co-molded onto the end shields and form the contact surface lying on the same level and the plane-parallel position of the Ensure that the end shields are attached to the laminated core.

Since the laminated stacks seen over their circumference due to the tolerance dimensions of the individual sheets and a possible The degree of standing of the individual sheets has a different axial length after packaging and pre-consolidation can, it should be apparent that in the stand assembly according to the invention, the stop surfaces the impressions at the points of greater tolerance oversize are pressed deeper into the laminated core are considered to have a slight excess tolerance or an undersize tolerance at such locations.

To make the stamping process as simple as possible can, is provided in an advantageous manner according to an embodiment of the invention that in the sense of a for the stator drilling of the laminated core, axially concentric fastening of the end shields on the laminated core to the end shields the laminated core axially overlapping and on this radially outside outside the area of the impressions adjacent centering edges are formed in the form of collars. Should be based on this additional collar training the end shields are dispensed with, it is advantageous to add the embossments and the end shields with stop or contact surfaces in the sense of an axially concentric fastening to the stator bore of the laminated core to provide the end shields on the laminated core; at the same time, impressions are made by the upsetting process on the laminated core for both the plane-parallel and right-angled ones that are concentric to the stator bore or motor axis Alignment and fixation of the bearing points achieved.

909841 / 016B

y 28H062

- / τ - VPA 78 P 3 O 5 8 BHD

The bearing points or end shields can be made of a softer or a harder material in comparison to that of the stator core.

The invention and further advantageous embodiments are shown schematically below with the aid of a Embodiment explained in more detail in the drawing. Show in it:

FIG. 1 shows the side view of a stator arrangement with a laminated core and bearing shields placed on both sides partly in a sectional view, FIG. 2 shows the top view of the stand arrangement according to FIG. 1 with the upper end shield removed.

FIG. 1 shows the side view, and FIG. 2 shows the top view of a packaged, pre-consolidated stator laminated core 3 · For pre-consolidation, the individual sheets stacked to form the stator core 3 are separated by four on the circumference distributed rivets 5 that run through the metal sheets and are compressed at the end faces are held together. The laminated core 3 is distributed with four axially directly indented by upsetting punches, on the circumference of each end face point-like embossments 31-35 or 36-39. In the figure 1 are at the upper end of the laminated core 3 the indentations 32 and 33 and at the lower end the indentations 37, 38, 39 and in Figure 2, the shows a plan view of the laminated core 3 with the bearing plate 1 removed, the impressions 36-39 can be seen; In the exemplary embodiment shown, the embossings have a semicircular shape that is open towards the outside, however, instead of the semicircular centering surface any other suitable shape can also be provided.

909841/0166

28U062

- * - VPA 78 P 3 O 5 8 FRG

As can be seen in particular from FIG. 1, the areas created by the embossments 31-35 and 36-39 are shown Stop surfaces 321, 331, 341, 351 on the upper Front side or 361, 371, 381, 391 on the lower front side Formed stop surfaces on which the two end shields 1, 2 with corresponding molded Contact surfaces 11, 12, 13, 14 for the upper bearing plate 1 or 21, 22, 23, 24 for the lower bearing plate 2 are in contact. The end shields are in a manner not shown here by means of axially extending over the laminated core and through holes 6, 7 of the end shields 1, push-through screws against each other and against the End faces of the stator core can be clamped in the area of the stop faces of the embossments.

As can be seen from Figure 1, the stop surfaces of one end face of the laminated core 3 opposite the Stop surfaces on the other end face of the laminated core 3 have the same height h over the entire circumference; there on the other hand, the end shields 1, 2 are provided with contact surfaces lying at the same axial level, it is thus ensured that the end shields 1, 2 attached to the laminated core as described above are plane-parallel are aligned with each other.

For axially concentric alignment and fixing of the end shields 1, 2 to the stator bore 4 of the laminated core are on the end shields 1, 2 centering edges 15, 25 molded in the form of collars that overlap the laminated core 3 axially by a short distance at the end faces and rest on the laminated core radially on the outside outside the area of the embossments 31-35 or 36-39; this is in particular from FIG. 2 and from the uncut side view of the upper left end shield part FIG. 1 can be seen. According to Figure 2, the centering 25 is shown there alone

909841/0168

^ 28H062

- β - VPA 78 P 3 O 5 8 FRG

Bearing shield 1 in the area of the embossments 36 - 39 interrupted, so that the centering edge formed as a collar in these areas does not rest against the outer circumference of the laminated core comes, due to the upsetting process during the production of the embossments is optionally widened radially by a small amount in the area of the embossments.

Following the interruptions in the centering edges 15, 25 in the area of the impressions, the collars are located then on the outside of the laminated core and ensure an axially concentric fixation.

In the examples shown, the laminated core 3 is expediently preconsolidated by riveting the embossments 31-35 or 36-39 in the vicinity of the pre-consolidation and the cohesion of the laminated core 3 serving rivets 5 provided. Instead of riveting, other known measures such as stapling or welding to hold the single sheets together can be provided. Instead of According to one embodiment of the invention, these measures or for additional consolidation can also be a Immersion of the laminated cores in a hardening liquid that bonds the stator plates to one another Find.

2 figures

7 claims

909841/0168

Claims (1)

28H062 - 1 - VPA 78 ρ 3 O 5 8 BRD Patent claims 1. jStander arrangement of a frameless electric motor with your dimensionally by upsetting punch in a cold forming process and precisely compressed laminated core, thereby characterized in that the laminated core (3) only with axially through the upsetting punch directly Point-like impressions (31-35 or 36-39) with such impressions on the face and distributed around the circumference Stop surfaces (321, 331; 371, 381, 391) for corresponding contact surfaces formed on the end shields (1, 2) (211, 221, 231, 241) is provided that the end shields (1, 2) on their to the stop surfaces pressed contact surfaces are attached to the laminated core (3) at least plane-parallel to one another. 2 -. Stator arrangement according to claim 1, characterized in that, in the sense of an axially concentric attachment to the end shields (1, 2) with respect to the stator bore (4) of the laminated core (3), the laminated core (3) axially overlaps and rests radially on the outside outside the area of the impressions Centering edges (15, 25) are formed. 3. Stand arrangement according to claim 1, characterized in that the impressions (31 - 35 or 36 - 39) and the end shields (1, 2) additionally with stop or contact surfaces in the sense one to the stator bore (4) of the laminated core (3) axially concentric fastening of the end shields (1, 2) on the Laminated core (3) are provided. 4. Stand arrangement according to one of claims 1 to 3, characterized in that the Laminated core (3) is preconsolidated in a manner known per se. 809841/016 $ ORIGINAL INSPECTED 5 · Stand arrangement according to claim 4, characterized in that the laminated core (3) by axially extending through the laminated core (3) and compressed at the end under pressure of the laminated core The rivet (5) is pre-solidified. 6. Stand arrangement according to claim 3 or 4, characterized in that the Laminated core (3) by dipping into a hardening and the stator sheets of the laminated core (3) mutually adhesive Liquid is pre-solidified. 7. Stand arrangement according to claim 3, characterized characterized in that the punctiform impression (31-35 or 36-39) in the vicinity of the end face Rivet heads of the rivets (5) are provided. 909841/0186