DE2547211A1 - ELECTRIC MACHINE WITH REPLACEABLE SHAFT - Google Patents

Description

133/75 Ri

10/3/75

BBC Aktiengesellschaft Brown, Boveri & Cie., Baden (Switzerland)

Electric machine with interchangeable shaft.

The invention "relates to an armature of an electrical Machine with exchangeable armature shaft between press rings located, axially ventilated through holes anchors sheet package and a collector, as well as a method for the production of the same.

Electrical machines are already known in which the axially ventilated laminated core, the press rings and the collector are located on an armature bushing and a shaft is pressed into the armature bushing. Electrical machines of this type are described, for example, in "Electrical Traction Vehicles" by K. Sachs, Springer-Verlag, 1973, Volume 2, page h 62.

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Designs of this type are, however, with traction motors not possible with a small anchor diameter, as the use of an anchor head increases the diameter by at least 20 mm required or the magnetic cross-section of the Laminated core between the bores and the shaft is too small. Another disadvantage is that the laminated core must be pressed together several times during layering, so that the sheets lie firmly against one another.

It is the object of the invention to provide an armature for an electrical To create machine of the type mentioned, which does not have the disadvantages of the known and in which The armature shaft can be replaced without an armature bushing is possible without the anchor having to be rewound »

A further object of the invention is to provide a method for production to create such an anchor.

In the case of an armature of the type mentioned at the outset, this object is achieved according to the invention in that the collector Adjacent press ring with Axialbohrungeji and arranged therein Is provided with threads, the collector is attached to the pressure ring and which consists of anchoring lamination packet, pressure rings and

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2S47211 "j"

lektor existing unit with the armature shaft frictionally connected is.

In this way the armature shaft can be replaced by electrical ones Collector machines are possible that do not have an anchor bushing without the need to rewind the anchor will. Furthermore, the manufacturing costs of an anchor according to the invention are significantly lower than in the case of the known designs. In addition, the invention brings manufacturing advantages and in particular allows

a) the sheet metal and the assembly of the armature on an auxiliary mandrel. This means that the laminated core only needs to be pressed together once, and the sheets are more even pressed,

b) shrinking the shaft in one operation. This results in re-pressing and repeated heating of the anchor avoided.

c) the reworking of the armature plate bore for the shaft to achieve a tightly toleranced shrink fit. Closely Tolerated shrink fits are required when large moments are transferred from the laminated core to the shaft will.

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It is advantageous to use the press ring with at least three axial bores as a result, the anchor plate pack can be clamped together evenly. Preferably, the Preparing a cylindrical hub on which to accommodate of the collector is used. Another embodiment consists in that the collector is screwed onto the press ring. The one-piece design of the collector and press ring has proven to be particularly suitable.

According to the invention, the anchor is manufactured by that the laminated core with the press rings and the collector with the help of an assembly device to a structural unit are combined and that this unit is positively connected to the armature shaft.

For spanning the armature core assembly, it is advisable to use Threaded bolts with nuts and a pressure ring are provided. It is advantageous to use the pressure ring with an external centering to provide, with this the anchor is clamped in a lathe, provided that a post-processing of the hole for the wave is necessary. The pressure ring is expediently provided with a shield to protect the armature winding.

Further details of the invention emerge from a Examples of implementation explained below with reference to the drawing

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2S47211

game of the invention, namely shows

Fig. 1 an I, / ings cut through the anchor of a collector body

FIG. 2 shows a longitudinal section through the armature according to FIG. 1 with the fan removed and the clamping device inserted.

In Fig. 1 1 two press rings 2, "5, and a located between the compression rings 2, 3 laminated core 4 are shrunk or pressed on an armature shaft. The press rings 2, 3 and the laminated core ¹ I are provided with extending parallel to the armature shaft 1 coaxial bores The bores in the press ring 2 are provided with threads. The press ring 2 is provided with a cylindrical hub 5 onto which a collector tube is pressed and secured against rotation with respect to the armature attached to the collector sleeve 6. The collector lamellae 9 are clamped in the dovetail-shaped recess of the collector sleeve 6 and the collector press ring 7 and are electrically conductively connected to the winding ends of the winding 10 located in the caps of the laminated core. The press ring 3 has axial bores 11, which are used to attach a fan 12.

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The replacement of the balls is described below with reference to FIG. 2 explained.

First of all, the fan attached to the press ring 3 is unscrewed. Threaded bolts 13 are inserted through the bores in the press ring 3 and the laminated core 4 and screwed into the threaded bores of the press ring 2. A pressure crane lh with an outer centering 15 and a shield l6 is pushed onto the free ends of the threaded bolts 13 and the laminated core 4 is clamped together by tightening the nuts 17. Then you press out the armature shaft, the other parts of the armature are held together by the threaded bolts. In this way, a new armature shaft can be pressed or shrunk into the armature without the armature having to be rewound. Now the nuts 17 are loosened again, the pressure ring I ¹ J removed, the bolts 13 unscrewed; and the fan 12 is attached to the press ring 3.

70981.5 / 0241

Le e rs'e i t e

Claims (7)

Claims 1. ι armature for an electrical machine with interchangeable Armature shaft and armature laminated core located between press rings and axially ventilated through bores, as well as a collector, characterized in that the press ring (2) adjacent to the collector is provided with axial bores and threads arranged therein, the collector (6,7,9) on the press ring ( 2) is attached and the unit consisting of the armature plate ^{pack (1} O, press rings (2,3) and collector (6,7,9) is non-positively connected to the armature shaft (1). 2. Anchor according to claim 1, characterized in that the press ring (2) is provided with at least three axial bores. 3. An anchor according to claim 1, characterized in that the press ring (2) has a cylindrical hub (5) for receiving the collector. 4 * anchor according to claim 1, characterized in that the collector is attached to the press ring (2) with screws. 5. Anchor according to claim 1, characterized in that the collector and the press ring ^ (2). are made in one piece. 709615/0241 133/75 6. A method for producing an anchor according to claim 1, characterized i '-. I.'kiMiMZiiichniil that the Anluu'blechpaket (Ί) with the press rings (2,3) and the collector (6,7,9) with the aid of a auxiliary assembly device (13,1 ^, 17) are combined to form a unit and that this unit (2,3, ¹ O is connected kraftschlüsaig to the armature shaft (1). 7. Anchor according to claim 6, characterized in that the Assembly (2.3 »4) by means of threaded bolts (13), one pressure ring (I4) and nut (17) clamped together. BBC Public Company Brown, Boveri & Cie. 709815/02