Sealing the cooling circuit of a rotor

Abstract

The invention relates to a rotor / rotor for electrical machines with a cooling circuit, comprising grooves, in particular running in the axial direction, of a laminated core, and an end plate which is fastened to the end face of the laminated core, wherein the end plate has recesses for the grooves, wherein extruded profiles are introduced into the grooves and the profiles terminate at the end face with the end plate or have a projection over the end plate and a sealing material is introduced between the extruded profiles and the end plate.

Description

The invention relates to a rotor / rotor for electric machines, wherein the rotor has a cooling circuit. The cooling circuit ensures cooling of the conductors in the laminated core. In this case, the coolant used, for example, must be used. Oil can be passed by the conductor. Penetration of the coolant into the air gap between the stator and the rotor is to be prevented.Until now, split tubes have been used for sealing, but this leads to larger air gaps between the rotor and the stator. The object of the invention is to ensure cooling of the conductors, the coolant used not having to come into contact with the conductors, the air gap between the stator and the rotor being to be kept as small as possible.This is achieved by a rotor / rotor for electric machines, having grooves, in particular running in the axial direction, of a laminated core, wherein an end plate is provided on the end side for sealing the cooling circuit and extruded profiles are introduced into the grooves. The end plate is fastened on the laminated core for sealing. In one embodiment of the invention, the front disk is glued on. Furthermore, the front disk has omissions for the grooves. The extruded profiles terminate in their height at least with the front plate; in a special embodiment, the profiles project beyond the front plate on the front side. The respective extruded profiles are circumferentially closed. For complete sealing, i.e. in order to prevent a penetration of coolant into the air gap between the stator and the rotor, a sealing material is introduced between the extruded profiles and the end plate.It has been found to be particularly advantageous to introduce the profile with a tool in such a way that the profile is widened in the direction of the end face after the insertion into the grooves. This ensures that the gap between the extruded profile and the respective groove is kept as small as possible.Furthermore, the front plate has a special shape. In addition to the openings for the grooves, a bead, in particular a filling bead, is provided in the front disk. Furthermore, a shaping can be provided around the bead in order to ensure better filling of the sealing material. In an embodiment according to the invention, the bead has a size of about 1-2 mm width. The position of the bead is exemplary. The bead may be disposed at any position.The sealant is an epoxy potting material with good flow properties, preferably the same material as that of the face plate. As the temperature increases, the coefficient of expansion of the materials increases, so that the generation of cracks and leaks can be counteracted.The sealing means is placed over the bead, so that the sealing means is arranged in the region between extruded profile and end plate.This arrangement achieves a pressure-tight vessel, since the cooling circuit must withstand a certain minimum pressure.In a special embodiment of the invention, the sealing material is introduced into a cavity between the end plate and the extruded material.List of reference numbers:1 Rotor 2 Grooves 3 Laminated core 4 End plate 5 End face 6 Extruded profiles 7 Bead 8 Recess 9 Sealing material 10 Cavity A Axial direction

Claims

Rotor / rotor for electric machines with a cooling circuit, having grooves, in particular running in the axial direction, of a laminated core, and a front disc which is fastened on the front side of the laminated core, wherein the front disc has recesses for the grooves, characterized in that extruded profiles are introduced into the grooves, wherein the profiles end at the front side with the front disc or have a protrusion over the front disc and a sealing material is introduced between the extruded profiles and the front disc.Rotor / rotor for electric machines with a cooling circuit, in particular according to Claim 1, characterized in that the end disc has a bead for introducing the sealing material.Rotor / rotor for electric machines with a cooling circuit, in particular according to Claim 2, characterized in that the bead has a width of 1-2 mm.Rotor / rotor for electric machines with a cooling circuit, in particular according to one of the preceding claims, characterized in that the sealing material corresponds to that of the end plate.Rotor / rotor for electric machines with a cooling circuit, in particular according to one of the preceding claims, characterized in that the extruded profiles are widened on their end face.Rotor / rotor for electric machines with a cooling circuit, in particular according to one of Claims 2 to 5, characterized in that the end plate has a recess around the bead.Rotor / rotor for electric machines with a cooling circuit, in particular according to one of Claims 1 to 5, characterized in that the extruded profiles end on the end face with the end disc, the end disc has a cavity in the region of the grooves, and the sealing material is preferably arranged in the cavity of the end disc and adjoins the profiles.

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