COOLING OF AN AXIAL END REGION OF A STATOR IN A ROTATING ELECTRICAL MACHINE

Abstract

An arrangement for cooling at least one axial end region of a stator in a rotating electrical machine, having: at least one annular chamber which is disposed on the radially outer periphery of at least one portion of the axial end region having at least one radial cooling duct, and which on the radially inner part towards the axial end portion is at least partially open and is communicatingly connected to the radial cooling duct, and which is sealed with respect to the axial end region; and at least one low-pressure line which is communicatingly connected to the annular chamber, and via which the annular chamber is communicatingly connected to a low-pressure chamber in the rotating electrical machine which, relative to a flow of cooling fluid that is created by a shaft-mounted fan on a rotor in the rotating electric machine, is upstream of the shaft-mounted fan.

Claims

1. An arrangement for cooling at least one axial end region of a stator of a rotating electrical machine comprising: at least one annular chamber which is arrangeable radially on the outer circumference of at least one portion, having at least one radially extending cooling duct, of the axial end region, and which has-is designed to be at least partially open radially inward in the direction of the axial end region and as a result is connectable in communicating fashion to the radial cooling duct, and which is sealed with respect to the axial end region; and at least one low-pressure line connected to the annular chamber in communicating fashion and via which the annular chamber is connectable in communicating fashion to a low-pressure space of the rotating electrical machine, which space, with respect to a cooling fluid flow which is generated by a shaft fan arranged on a rotor of the rotating electrical machine, is arranged upstream from the shaft fan.

2. The arrangement as claimed in claim 1, wherein at least one fan, by which a fluid flow in the low-pressure line is intensified, is arranged in the low-pressure line.

3. The arrangement as claimed in claim 1, wherein the low-pressure line is guided axially through radially extending partition walls of a high-pressure space containing a stator winding head of the rotating electrical machine, which space is arranged downstream from the shaft fan with respect to the cooling fluid flow which is generated by the shaft fan.

4. A rotating electrical machine, comprising: a stator which is designed as a plate stack with radially extending cooling ducts; a rotor on which at least one shaft fan is arranged outside the stator; at least one low-pressure space which, with respect to a cooling fluid flow which is generated by the shaft fan, is arranged upstream from the shaft fan; at least one high-pressure space which contains a stator winding head and which, with respect to the cooling fluid flow which is generated by the shaft fan, is arranged downstream from the shaft fan; and at least one arrangement as claimed in claim 1.

5. A method for cooling at least one axial end region of the stator of a rotating electrical machine, the method comprising: selectively sucking a cooling fluid which flows through at least one radially extending cooling duct of the axial end region via a low-pressure line unit sealed with respect to the environment, wherein the line unit is connected in communicating fashion to a low-pressure space of the rotating electrical machine, wherein the space, with respect to a cooling fluid flow which is generated by a shaft fan arranged on a rotor of the rotating electrical machine, is arranged upstream from the shaft fan.

6. The method as claimed in claim 5, wherein a fluid flow in the low-pressure line unit is intensified at least one fan arranged in the low-pressure line unit.

7. The arrangement as claimed in claim 1, wherein the rotating electrical machine comprises a generator.

8. The method as claimed in claim 5, wherein the rotating electrical machine comprises a generator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Anembodiment of the rotating electrical machine according to the invention is explained below with the aid of the attached schematic drawings, in which:

[0022] FIG. 1 shows a view of a portion of an exemplary embodiment for a rotating electrical machine according to the invention.

DETAILED DESCRIPTION OF INVENTION

[0023] FIG. 1 shows a view of a portion of an exemplary embodiment for a rotating electrical machine 1 according to the invention in the form of a generator.

[0024] The rotating electrical machine 1 comprises a stator 2, which is designed as a plate stack with radially extending cooling ducts 3. The rotating electrical machine 1 furthermore comprises a rotor 4 on which at least one shaft fan 5 is arranged outside the stator 2.

[0025] The rotating electrical machine 1 additionally comprises at least one low-pressure space 6 which, with respect to a cooling fluid flow which can be generated by means of the shaft fan 5 and which is indicated by the arrows 7, is arranged upstream from the shaft fan 5. The rotating electrical machine 1 also comprises at least one high-pressure space 8 which contains a stator winding head 9 and which, with respect to the cooling fluid flow which can be generated by means of the shaft fan 5, is arranged downstream from the shaft fan 5.

[0026] The rotating electrical machine 1 moreover comprises at least one arrangement 10 for cooling the axial end region 11 shown of the stator 2 of the rotating electrical machine 1.

[0027] The arrangement 10 comprises an annular chamber 12 which can be arranged radially on the outer circumference of a portion, having two radially extending cooling ducts 3, of the axial end region 11. The annular chamber 12 is designed to be at least partially open radially inward in the direction of the axial end region 11 and as a result is connected in communicating fashion to the two radially extending cooling ducts 3. The annular chamber 12 is sealed with respect to the axial end region 11.

[0028] The arrangement 10 furthermore comprises at least one low-pressure line 13, connected in communicating fashion to the annular chamber 12 and via which the annular chamber 12 is connected in communicating fashion to the low-pressure space 6 of the rotating electrical machine 1. The low-pressure line 13 is guided axially through radially extending partition walls 14 and 15 of the high-pressure space 8. Two drivable fans 16 and 17, by means of which a fluid flow in the low-pressure line 13 can be intensified, are arranged in the low-pressure line 13. The fans 16 and 17 are, however, required only when the static pressure drop formed is insufficient to cause a corresponding cooling capacity. Together with the low-pressure line 13, the annular chamber 12 forms a low-pressure line unit.

[0029] With respect to the flow direction of the cooling fluid, indicated by the arrows 7, a cooler 18, by means of which the cooling fluid heated in the stator 2 and rotor 4 can be recooled so that it can be used again for cooling, is arranged downstream from the stator.

[0030] The rotating electrical machine 1 comprises a housing 19 which surrounds the stator 2 and an active part of the rotor 4. The housing 19 comprises end walls 20 and outer walls 21 arranged radially outward with respect to the stator 2.

[0031] The stator 2 comprises a support unit 23 on which stator components 22 and the stator winding head 9 are fastened.

[0032] Although the invention has been illustrated and described in detail by the preferred exemplary embodiment, the invention is not limited by the example disclosed and other variants can be derived by a person skilled in the art without going beyond the scope of the invention.