DE1538940B1 - Process for the production of flat collectors of electrical machines - Google Patents

Description

3 4

zen completely from the sheet metal transfer strip under star- In a first type of exercise of the invention

To increase the clearance between the blank and the moderate process, proceed as follows

Cut off the recess of the strip, but furthermore:

out through the recess of the strip. In a first step (F i g. 1 and 2)

From the USA patent specification 1721515 5 in the sheet metal transfer strip 1 the middle hole2 a flat collector is known, the collector lamella of which is cut out of the collector, while at the same time almost len on the back by means of dovetail-shaped indentations on the entire circumferential profile 3 of the collector encapsulated carrier extended circular sectors 1 a are held in the Streigehaltert. The carrier there consists of fen 1 cut out in such a way that only connecting metal, against which the individual collector lamellae io dungsstege 1 b between the collector blank EC len are insulated by an insulation layer. and the strip 1 stop. The bridges Ib have

The invention is based on the drawings below a relatively small width and are in

explained. formed in the manner shown so that their fastening

F i g. 1 and 1a show two separate drawing points on the strip 1 and the blank EC

Views for a first type of exercise of the invention are diametrically opposed. Your elasticity will still be

according to the method performed on the press due to the reduced thickness compared to the blank

NEN successive operations for manufacturing EC due to the described profile of the strip

position of a flat collector, this Ar- (Fig. 10) favors. As a result, the blank

operations in reality in continuous sequence to EC, although he is through the webs 1 b with the strip

a sheet metal transfer strip, 20 is still connected, a certain elastic adjustment

but for reasons of space in two separate figures possibility in all directions opposite the

are shown; Strip so that a self-centering of the blank

F i g. 2 to 9 are axially cut side views - EC compared to the tools on the following

ten of the strip, which is possible for one of the successive processing stations. Furthermore,

low, in Fig. 1 and 1 a shown operations 25 during this first operation along the edge

correspond; of the strip 1 in the axis of the blank EC a

Fig. 10 shows a diagram of a cut out by webs with recess Ic, which in each of the

The perforated disc-shaped collector blanks are followed by operations with the tool of

bound strips, the different processing stations of which work together along the side edges,

lowing sections have a smaller thickness; 30 that the blank each time in the working axis of the

11 shows a perspective view of the finished flat press being adjusted.

Collector; In a second step (Figs. 1 and 3)

Fig. 12 is an overall axial sectional view taken on the press from one side of the blank EC

an electrical machine with built-in collector from a recess 4 α in the form of a circular

gate; 35 wreath formed.

13 and 14 show separate top views of the next operation (FIGS. 1 and 4)

for a second type of exercise of the invention also on the press and deforms the circular

Process the successive work steps mige recess 4 α so that the second work

for the production of a flat collector, which is made up of arched edges of the opening

For reasons of space, shown in two views, but are approximated in FIG. 40 and a recess 4 with

Reality made in a continuous sequence of dovetail-shaped cross-section arises,

will; Thereupon successive deepening

15 to 21 are axially cut side tabs which separate the collector lamellas, which the radial grooves 5 shown in Figs. 13 and 14 formed and on one of the largest successive Correspond to operations; 45 th part corresponding to the thickness of the collector

Fig. 22 is a depth taken along line 22-22 in Fig. 23;

sectional side view; Thereupon (Fig. La and 8) the webs Xb

23 is a top plan view of the finished collector cut away to show the finished collector C of FIG

Separate the strip 1 from an electrical one before attaching it to the rotor. At the same time, the

Machine. 50 piston C deburred.

It is carried out by a sheet metal transfer strip 1. The inputs, the thickness of which corresponds to the thickness of the cuts to be made 6 for the connecting conductors on the circumference of the two flat collectors, are the next processing station. The lateral longitudinal see the radial grooves 5 existing lamellas sections 1 e have expediently, as shown, formed (F i g. 1 a and 9).

a smaller thickness in order to increase the elasticity of the further 55 in a second type of exercise of the procedure

A sheet metal transfer strip 7 is made from the cut-out webs described below (FIGS. 13 to 23)

bigger. Metal or a suitable alloy with the same

This strip is made of copper or a moderate thickness is used. In a first step

their suitable metal or alloy. It (Fig. 13, 15) becomes the middle one in strip 7

a row of 60 holes 8 of the collector is cut out solely on presses, and at the same time

Operations by the consecutive advantages will completeness at the periphery of collector blank EC

Separated by the access to processing area equipped with presses. The blank EC is now complete

zen is separated from the stripe by a periodic shifting of the stripe, but it becomes in the

fens compared to these processing stations.

leads, wherein the various operations so mono- mung 65 7 α retained the same and mitgenom-

are directed that they use the required synonym.

chronism and the required simultaneity during a work process which is linked to the

can be made. preceding can be combined or separated

can, the game 9 between the blank EC and the recess 7α is greatly increased (FIGS. 13 and 16). This clearance allows an independent self-centering of the blank EC at each processing station during the later work steps.

As with the first type of exercise, the strip and the blank are at each machining station a summary setting by means of the grooves 7 & given. The further sequence of the operations corresponds the one described above for the first type of exercise.

The manufacture of flat collectors according to the above method is because of the quick and easy economic production in mass production or in medium or small series with the help of mechanical or hydraulic presses very useful, with the collectors produced are very accurate.

The collectors produced in this way are now cast on the rotor of an electrical machine together with the rotor winding. In Fig. 12, a conical rotor i? which has a rotor winding R ¹ embedded in an insulating plastic P. When the insulating plastic is poured into a corresponding mold in which the parts to be enveloped are located with the collector C, the plastic penetrates into the recess 4 and the grooves 5. Before that, however, the connecting conductors of the winding R ^{1 must be} connected to the collector lamellas at the incisions 6.

The dovetail-shaped cross-section of the recess 4 is ensured by the filling with Plastic a tight and strong connection of the

ίο collector with the rotor insulated with casting compound, so that the collector can withstand the heaviest loads. So that the plastic that has penetrated into the grooves S causes a perfect insulating separation of the collector lamellas, the collector surface C ¹ is removed with a diamond or in some other way by the entire thickness e until the radial grooves 5 are exposed and thus no direct metallic ones Connection between the slats is longer.

ao After pouring the plastic plastic mass is the collector the possibility to extend both in the direction of the standing with the brushes in contact machined end faces C ₂ and Λ in the direction of the circumferential surface.

1 sheet of drawings

Claims (3)

in which, furthermore, the collector lamellae are separated from one another by machining. 1. Method for the production of flat collectors In flat collectors, the brushes are placed in lectors of electrical machines, in which the 5 of the axial direction of the rotor against the frontal circular surface of the collectors with a hole in the middle. The collectors are ling punched out of sheet metal and its back, which is known to be subject to significant stresses and anchored, was thrown from one. You have to be able to achieve a high speed of rotation in a fraction of a second with insulating plastic compound, which furthermore causes significant torques and significant torsional casting due to machining and bending stresses to act on them after the io. In addition to being separated from each other, wear from brush friction and characterized by the fact that when a commutation spark is used, stresses occur on the sheet metal transfer strips (1) with one of the thermal stresses produced, which are different in thickness due to the collectors (C) below elongation of plastic and metal collector beder blank (EC) are first dingt two. diametrically opposite, a self-centering A method of the type mentioned is tion-enabling webs (Ib) with the strip known from the US Pat. No. 2,421,845) remains in connection that has been punched out. There, however, the punched sheet metal of the cutouts ( 1c) 20 on the edge of the strip (1) is flanged backwards so that it is cut out, with the aid of which the raw small hooked toe (EC) protruding from the plane is attached to the following Machining arise that serve to anchor the plastic mass ^ burst in the working axis of the respective press. The separation of the collector lamellas takes place so that the back of the blank (EC), which is directed upwards, is cut in a circular manner by making slots in the collector plate. In the known method, mige recess (4) with dovetail-shaped manual interventions for inserting, aligning and like a cross-section for anchoring the art-centering of the collector blank are required. In addition, the slits between the collector slats must be radial grooves (5) which penetrate the blank to the door slats and are subsequently filled with plastic, so that no carbon dust from the brush and then the webs (1 b) cut through can put it in the gaps,
the fact that the collector (C) on the rotor of the electric- Based on this, the invention is "the sensation machine ■ attached and together with there would be the basis of the process for the manufacture of the rotor winding (R ¹ ) is cast; that flat collectors to simplify Finally, the collector surface (C ¹ ) is designed in such a way that a "transfer" fabrication can be removed without any need for radial interventions. Invention grooves (5) are uncovered. duly solved in that when using 2. The method according to claim 1, characterized ge ernes sheet metal transfer strip with one of the herzukmarks that a sheet metal transfer strip (1) providing collectors corresponding thickness with lateral longitudinal sections (1 e) of opposite 40 collector blank initially over two diametrically lower than the collectors to be produced Opposite, a self-centering thickness is used, whereby the width of the central web remains in connection with the strip, the leren longitudinal section corresponds to the diameter of the collectors to be produced when punching out at the edge of the strip, and that savings are cut out with their help flj the webs (Ib) are punched out of the lateral longitudinal sections 45 of the blank on the subsequent processing plates (1e) . zen in the working axis of the respective press 3. Modification of the method according to Employment is that on the upwardly directed claim 1, characterized in that the KoI- side of the blank has a circular recess with lektorrohling (EC) when punching completely dovetail-shaped cross-section for Veranvom sheet metal transfer strips (1) strong anchoring of the plastic compound and between the herzugrößerung of the game (9) between the blank (EC) providing radial collector lamellae, the blank and recess (7 a) of the strip (1), for the most part penetrating grooves are pressed in, but still be cut through the recess and then the webs that the (7 a) of the strip is guided. Collector attached to the rotor of the electrical machine 55 brought and cast together with the rotor winding becomes that finally the collector surface is removed as a whole until the radial grooves are exposed. In order to increase the elasticity of the webs 60 proposed according to a development, a Sheet metal transfer strips with lateral longitudinal sections from opposite to the collectors to be produced The invention relates to a method for producing smaller thicknesses, whereby the width of the position of flat collectors of electrical machine middle longitudinal section corresponds to the diameter of the diameter of the collectors to be produced in the middle and the webs sending collector blank punched out of a sheet metal from the lateral longitudinal sections,
and its anchored rear side In a modification of the invention an insulating plastic compound is cast around the collector blank when it is