Patent ID: 12224626

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG.1shows a rotor core4which is arranged concentrically relative to the rotor axis6, wherein the rotor core4has slots3, said slots3being filled with an electrically conductive material.FIG.1shows a short-circuiting ring2which is arranged concentrically relative to the rotor axis6at a rear axial end9of the slots3and comprises an electrically conductive material.

In the figure, a surface of the ring2facing away from the rotor core3has a bevel in an axial direction7from an outer circumference21to an inner circumference22of the ring2, with a bevel angle α.

The figure shows a support element1which is at least partially connected to the ring2. In the figure, the rotor core4and the support element1adjoin a shaft5.

At a surface facing toward the ring2, the support element1has a section which has a bevel in an axial direction7from the outer circumference21to the inner circumference22, with a bevel alternate angle α′ which is an alternate angle to the bevel angle α. The bevel angle α in the figure has a value of 13° C. A value of the bevel angle α preferably lies in a range from 3° C. to 30° C., in particular 10° C. to 20° C. The figure shows that a radial positive engagement is present between short-circuiting ring2and support element1.

The invention offers the advantage that greater suitability for speed is achieved for a rotor11, in particular a rotor of an asynchronous machine. Under stress of rotational speed, there is no risk that the short-circuiting ring will tilt or that the short-circuiting material will yield.

The support element1is preferably pressed onto the short-circuiting ring2axially. The support element1is supported on the shaft5. This means that the support element1and therefore the short-circuiting ring2are mechanically braced by the shaft5.

FIG.2shows a second embodiment of the rotor11.FIG.2shows that the surface of the ring2facing away from the rotor core4has at least one first region having a first part-bevel in an axial direction7from the outer circumference21to the inner circumference22of the ring2, with a first part-bevel angle β, and at least one second region having a second part-bevel in an axial direction7from the outer circumference21to the inner circumference22of the ring2, with a second part-bevel angle γ, wherein the first part-bevel angle β and the second part-bevel angle γ differ.

The figure shows three first regions with the part-bevel angle β and two second regions with the part-bevel angle γ.

The figure also shows the support element1. The figure shows that the support element1has, at the surface facing toward the ring2, at least one first region having a bevel in an axial direction7from the outer circumference21to the inner circumference22, with a part-bevel alternate angle β ′ which is an alternate angle to the first part-bevel angle β, and that the support element1has, at the surface facing toward the ring2, at least one second region having a bevel in an axial direction7from the outer circumference21to the inner circumference22, with a part-bevel alternate angle γ ′ which is an alternate angle to the second part-bevel angle γ.

The figure here shows three first regions with the part-bevel angle β ′ and two second regions with the part-bevel angle γ ′.

Such an embodiment of the invention allows greater absorption of a radial force component.

FIG.3shows a third embodiment of the rotor11. The embodiment shown is suitable for particularly high circumferential speeds at the outer circumference of the rotor11. Circumferential speeds of up to 180 m/s are possible.

The figure shows a support element1which has an inner support disc101and an outer support device102. In the figure, the inner support disc101and the outer support device102are connected with a material fit, preferably by means of welding.

A connection between the support disc101and the support device102is preferably realized at or at least close to the outer circumference. The inner support disc101advantageously has recesses, the number of recesses corresponding to the number of slots3in the rotor core4.

The inner support disc101is advantageously incorporated when the ring2is formed. The inner support disc101is preferably cast in during the formation of the ring2by means of die casting. The outer support disc102is attached after cooling, in particular by means of a bonding force in an axial direction. The welding is preferably performed subsequently. A weld seam is therefore present at the outer circumference of the rotor11. The welding is optional.

FIG.4shows a fourth embodiment of the rotor11. In addition to the embodiment described above inFIG.1, the embodiment inFIG.4has a recess13in the support element1, said recess being used to correct an imbalance.

The advantage here is that balancing does not take place in the short-circuiting ring as before, but in the support element1. This means that the support element1additionally functions as a balancing disc.

It is also possible to apply a thickening to the support element1, said thickening being used to correct an imbalance. This is not illustrated in the figure.

FIG.5shows a fifth embodiment of the rotor11. The figure shows channels14and15, which allow rear ventilation of the rotor11. This is explained in greater detail inFIG.6.

FIG.6shows the rotor11fromFIG.5, viewed from an end face. Both figures show channels14and15, which are used for rear ventilation of the rotor11. The channels14can be cast in, for example. The channels15are present in the support element1. By virtue of the recesses, air is sucked in during the rotation of the rotor11. This provides the rear ventilation.

By virtue of these recesses in the support element1, the air is sucked in during rotation and expelled at the outer circumference of the short-circuiting ring2.

FIG.7shows a dynamo-electric rotary machine10with the rotor11. The figure shows a stator12, the shaft5and the rotor axis6. Viewed in an axial direction7, the rotor11has a support element1at the front axial end8. The rotor11also has a support element1at the rear axial end9.

FIG.8shows a method for producing the rotor11, a rotor core thereof being arranged concentrically relative to the rotor axis and having slots.

In a method step S1, the rotor core is provided.

In a method step S2, the slots3are filled with an electrically conductive material. In this case, the slots3can be filled with preprepared bars or by means of die casting. A combination of preprepared bars or other shaped inserts and die casting is also possible.

In a method step S3, electrically conductive material is deposited at the front and/or rear axial end of the slots3in order to form a front and/or rear ring2. This is advantageously achieved by means of die casting.

In a method step S4, the support element1is pressed on. The support element1is advantageously guided on the shaft during this pressing operation. By virtue of the previously described bevel of the ring2and the support element1, any out-of-round of the short-circuiting ring2, this being cast in particular, is corrected by the support element1and a coaxiality of the whole short-circuiting ring2relative to the shaft5and hence to the rotor core is improved.

The support element1is advantageously shrunk onto a shaft and pressed onto the short-circuiting ring2axially under force. As a consequence, the surfaces of the support element1, these preferably being oriented axially inward, and the outer surfaces of the short-circuiting ring2fit tightly together. A bonding force is preferably maintained for approximately 20 to 30 seconds in order to ensure full placement. A bonding force of approximately 30 t is advantageously applied in the case of a short-circuiting ring having a diameter of 130 to 170 mm, in particular 150 mm. The support element is preferably heated up to approximately 120° C. for the purpose of shrinking on.

The invention has the advantage that a casting skin which forms during the die casting of the short-circuiting ring strengthens the short-circuiting ring.

The rotor produced by this method significantly reduces the risk of material displacement due to centrifugal forces, by virtue of the strength of the support element.