DE8435837U1 - Laminated stator core for an electrical machine - Google Patents

Description

I R. 19760 i

26. 11. I98U St / Pi I

ROBERT BOSCH GMBH, 7OOO STUTTGART 1

V .. Laminated stator core for an electrical machine
State of the art

The invention is based on a stator laminated core for a
electric machine according to the preamble of the main claim.
A stator is already known in which all ring-shaped,
individual slats with recesses that are open to the outside
are provided so that after stratification of the stator core
open-edged grooves result. So that the slats are not in
many individual parts fall apart, the individual slats have to
between each recess forming the grooves and the
. annular central recess have a web that

causes an undesirable magnetic leakage flux. Around
To reduce this leakage flux, it has also been proposed to layer the stator core from a large number of ring-shaped sheet metal laminates that are closed on the outer circumference.
The grooves | Opened to the outside by separating cuts. The laminated core loading f stands of two groups of laminations, one of which, with the laminations of one group all the grooves are open by egg ξ NEN gap to the inner Ringk'ante, while ':

the sheet metal lamellas of the other group between the inner f

I ring edge and each groove a continuous web remains. . j

19760

Through this measure, the magnetic leakage flux could be reduced, since the said connecting webs are not in every single lamella must be present.

Advantages of the invention

The stator core according to the invention with the characteristic Features of the main claim has the advantage over it that the problem of magnetis-ile reluctance is surprising simple and inexpensive way could be solved. Both the unfavorable magnetic circuit are omitted (_ influencing connecting webs on the inner circumference of the lamellas as well as separating cuts to be carried out subsequently to open the grooves towards the outside. With the elimination of the Separating cuts do not require any additional deburring work. The manufacture of the stator requires only a few operations, which can be largely automated.

The measures specified in the subclaims mean that | advantageous developments and improvements of the stator sheet metal core specified in the main claim are possible. Particularly It is advantageous with regard to unproblematic production that all lamellar blocks are made from lamellas the same outer contour exist. Furthermore it is to achieve an optimal position securing and fixation of the individual lamellar blocks are advantageous to each other, that the cage has two & Has rings which are connected to one another by longitudinal webs which are located between the individual lamella blocks Lent spacer slots reach through.

drawing

An exemplary embodiment of the invention is shown in the drawing and is detailed in the following description

I * t * C ti

■ ·· ·· ii ·

1Q760

explained. FIG. 1 shows a stator laminated core in a cross section, and FIG. 2 shows the stator laminated core in one Longitudinal section along the line II-II in FIG. 1.

Description of the embodiment

The stator laminated core shown in the figures for an electrical machine consists of several, discrete LamelxcüuxüC & cü ι, never 5.α. 5 KiügScgiüclit · β 5.Ü3 formed Siild UiIu have the same shape. The lamella blocks 1 are arranged on a common pitch circle at the same distance from one another. The circular central recess 2 enclosed by the blocks is used to accommodate a rotor (not shown). As can be seen from FIG. 2, the individual lamellar blocks are layered from a multiplicity of individual sheet metal lamellae 3 made of magnetic sheet metal, which are firmly connected to one another by gluing, welding or mortising. The lamellar plates 3 have the same shape and dimensions, which facilitates the layering process. The individual lamellar blocks 1 are separated from one another by an inner slot k and an outer slot 5 each. They are shaped so that their outer contour forms a circle interrupted by the slots 5 and their inner contour a circle interrupted by the slots k.

In order to connect the lamellar blocks] to one another and to fix them in their mutual position, the blocks sit in a cage made of plastic material. In detail, this cage has two rings 6 resting on the two end faces of the lamella blocks (FIG. 2). These are connected to one another by longitudinal webs 7 which extend through the inner spacing slots k between the lamella blocks 1. The webs T each have two integrally formed with them ^! sets 8 which lie against the walls of hats 9 formed in the lamellar blocks J and line them. This measure improves the loading due to the plastic cage

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worked together between the individual lamella blocks * * ken and acts as additional insulation between the introduced through the slots 5 in the grooves 9, not shown Stator windings, the surface of the webs 7 facing the central recess 2 closes flush with the surfaces the lamellar blocks 1 from, so that no additional air gap between the rotor and stator. The slots 5 remain open so that the stator can be wound from the outside. Of the The outer circumference remains free of plastic. After winding, the magnetic circuit is closed on the outer circumference of the Stator laminated core attached a return pipe or a return winding.

The cage 6, 7, 8 is expediently by molding around the lamellar blocks 1 with an injectable plastic in produced by an injection molding tool. For this purpose, the individual lamellar blocks 1 are taken in a corresponding on one Injection tool used, which are designed so that they the lamella blocks 1 in the circumferential direction and in the radial Fix the direction of the stator and keep them at a defined distance from each other. Will be in these receiving chambers Heat-liquefied plastic is injected under high pressure, which fills the space between the walls aer Receiving chambers and the lamella blocks located free spaces. The rings 6 and the webs 7 are thereby formed and the linings 8 of the grooves 9

Instead of an injection molding tool, the cage 6, 7 »8 auck made in a correspondingly designed mold into which the lamellar blocks J are inserted and then with liquid plastic is poured out, which solidifies at normal temperature.

750

The cage 6, 7 _S 8 can, depending on the respective conditions of use, both in terms of the material composition
as well as in the dimensions so that he
has a high mechanical strength and is also resistant to corrosion and temperature influences.

Claims (1)

«Lit · Il r t · • pi} I · · · • ι R. 19760 11/26 1 98U. St / Pi ROBERT BOSCH GMBH, 7000 STUTTGART 1 Expectations 1. Stator laminated core for an electrical machine, which is made from a plurality of firmly interconnected sheet metal lamellas, arranged in the sheet metal lamellae on a common pitch circle according to: tußen open recesses are formed which are at equal distances from one another and the lamellae with regard to the recesses are congruent on one another, so that grooves for receiving the stator windings result, characterized in that the stator laminated core consists of several discrete lamellar blocks (1) designed as ring segments, which are arranged on a common pitch circle at the same distance from one another and in a Cage (6, T ₉ 8) made of plastic material are embedded. (l 2 .. stator laminated core according to claim 1, characterized in that that all lamellar blocks (1) consist of lamellas (3) with the same outer contour. 3 · stator lamination stack according to claim 1 or 2, characterized in that, the cage (6, 7 _S 8), two on the front faces of the lamellae blocks (1) adjacent rings (6) which are interconnected by longitudinal webs (7), which pass through the spacer base seats (h ) located between the individual lamellar blocks. Il Mil
> ■ ·
I 1 · · fill 760 k. Laminated stator core according to Claim 3, characterized in that the spacing slots (k) extend between the inner circumferential surface of the lamellar bell (1) and the grooves (9) formed in them. 5. stator sheet metal core according to claim 3 or k, characterized in that the webs (7) have extensions (8) which bear against the walls of the grooves (9) formed in the lamellar blocks (.1) and these undress.