Winding head cooling
A dynamoelectric machine having a stator having a substantially cylindrical or hollow-cylindrical stator body, a rotor arranged substantially coaxially with the stator, two ring elements, of which in each case one is arranged on each end face of the stator body. Each ring element has inlet nozzles through which a cooling fluid can be sprayed onto the winding heads of the stator. Penetration of the cooling fluid into the air gap of the machine is prevented in that each ring element radially and axially encloses the winding heads arranged on the respective end face, such that the winding heads are encased in an annular space bounded by the respective ring element and the respective end side of the stator body.
1 . A dynamoelectric machine comprising:
a stator having a substantially cylindrical body with end faces including winding heads, a rotor arranged substantially within the stator, two ring elements, each ring element arranged on a respective end face of the stator body, wherein each ring element has inlet nozzles, through which a cooling fluid can be sprayed onto the winding heads of the stator, wherein each ring element radially and axially encloses the winding heads of each respective end face, so that the winding heads are encased in an annular space bounded by the respective ring element and the respective end face of the stator body, and two end face housing sections, the ring elements each being arranged between an end face of the stator body and one of the end face housing sections such that between each ring element and associated end face housing section, a cavity is defined which can be filled with the cooling fluid via at least one inlet, the cavity being connected to the annular space via the inlet nozzles.
2 . The dynamoelectric machine according to claim 1 , wherein the inlet nozzles are arranged at radially different positions distributed over a circumference of each ring element such that radially adjacently positioned inlet nozzles can spray radially stacked conductors of the winding heads.
3 . The dynamoelectric machine according to claim 1 , wherein the ring elements each have a collecting channel arranged so the cooling fluid sprayed onto the winding heads drains into the collecting channel and is prevented from penetrating an air gap of the machine.
4 . The dynamoelectric machine according to claim 1 , wherein the end face housing sections are configured as bearing shields.
5 . The dynamoelectric machine according to claim 1 , wherein each cavity is divided into circular arc-shaped cavity segments via radially and axially extending partition walls arranged on the respective ring element.
6 . The dynamoelectric machine according to claim 1 , wherein each ring element comprises circumferentially distributed outlet openings, and each end face housing section comprises a drainage channel and a drainage opening, wherein the inlet nozzles, the outlet openings, the drainage channel and the drainage opening are arranged such that the cooling fluid sprayed through the inlet nozzles onto the winding heads can be directed via the outlet openings from the annular space into the drainage channel, and from there to the drainage opening.
7 . The dynamoelectric machine according to claim 6 , wherein the outlet openings are integrated into the collecting channel.
8 . The dynamoelectric machine according to claim 7 , wherein the outlet openings in the collecting channel are circumferentially separated from one another by separating webs which extend in radial and axial directions into the annular space.
9 . The dynamoelectric machine according to claim 1 , wherein the stator body has substantially axially extending bores which are distributed circumferentially over an outer lateral surface of the stator body and form stator cooling channels, wherein the stator cooling channels are connected to the annular space via the inlet nozzles to form a common cooling circuit.
10 . The dynamoelectric machine according to claim 1 , wherein the cavity is formed between an external surface of the ring element and the end face housing section.
11 . The dynamoelectric machine according to claim 1 , wherein the end face housing sections are each arranged on a respective end face.
12 . The dynamoelectric machine according to claim 1 , wherein each end face housing section and a respective ring are axially coextensive.
13 . A ring element for enclosing winding heads of an end face of an associated dynamoelectric machine having a stator body, the ring element comprising: inlet nozzles through which a cooling fluid can be sprayed onto the winding heads of the stator; wherein the ring element is configured to radially and axially enclose winding heads of the associated dynamoelectric machine so that the winding heads are encased in an annular space bounded by the ring element and an end face of the stator body of the associated dynamoelectric machine, wherein the ring element has a collecting channel formed entirely by the ring element arranged so the cooling fluid sprayed onto the winding heads drains into the collecting channel and is prevented from penetrating an air gap of the associated dynamoelectric machine, and wherein the ring element comprises circumferentially distributed outlet openings integrated into the collecting channel.
14 . The ring element according to claim 13 , wherein the inlet nozzles are arranged at radially different positions distributed over a circumference the ring element such that radially adjacently positioned inlet nozzles can spray radially stacked conductors of the winding heads.
15 . The ring element according to claim 13 , wherein the outlet openings in the collecting channel are circumferentially separated from one another by separating webs which extend in radial and axial directions.
16 . The ring element according to claim 13 , wherein the outlet openings are in a planar axial end face of the ring element.