CN117318353A

CN117318353A - Electronic machine having cooling system including atomizer device

Info

Publication number: CN117318353A
Application number: CN202310771332.9A
Authority: CN
Inventors: K·鲍曼
Original assignee: Garrett Power Technology Shanghai Co ltd
Current assignee: Garrett Power Technology Shanghai Co ltd
Priority date: 2022-06-27
Filing date: 2023-06-27
Publication date: 2023-12-29

Abstract

An electronic machine includes a housing and a rotating group supported for rotation about an axis of rotation within the housing. The electronic machine includes a stator having a plurality of end windings. The electronic machine further includes a plurality of nozzles removably supported by the housing and circumferentially spaced about the axis of rotation. The plurality of nozzles are directed generally radially toward the axis of rotation and toward the plurality of endwindings for spraying a cooling fluid onto respective endwindings of the plurality of endwindings.

Description

Electronic machine having cooling system including atomizer device

Cross Reference to Related Applications

The following claims priority to U.S. provisional patent application Ser. No. 63/367,053 filed on 6/27 of 2022, the entire disclosure of which is incorporated by reference.

Technical Field

The present invention relates generally to an electronic machine, and more particularly, to an electronic machine having a cooling system including a sprayer device.

Background

Various electronic machines are provided for various purposes. For example, an electric motor is provided for driving shaft rotation, a generator is provided for converting shaft rotation into electrical energy, and some electronic machines are configured to operate as motors under some conditions and as generators under other conditions.

The electronic machine may include a stator that generates a large amount of heat during operation. Overheat conditions may negatively impact the performance of the electronic machine. For example, thermal limitations of the stator material may limit the amount of power that can be generated by the electronic machine.

Thus, in some cases, the electronic machine may be configured with a cooling system. Various types of cooling systems have been proposed for this purpose. However, conventional cooling systems of this type may be limited in efficiency and performance may therefore be limited.

Accordingly, it is desirable to provide an improved cooling system for electronic machines. For example, it is desirable to provide an electronic machine that efficiently supplies a cooling fluid to a stator. It is also desirable to provide such a cooling system in which the cooling fluid is circulated efficiently and effectively through the electronic machine for improved operation. Further, it is desirable to provide such an electronic machine that can be manufactured and assembled in an efficient manner. Other desirable features and characteristics of the present invention will become apparent from the subsequent detailed description and the appended claims, taken in conjunction with the accompanying drawings and this background discussion.

Disclosure of Invention

An electronic machine is disclosed that includes a housing and a rotating group supported for rotation about an axis of rotation within the housing. An electronic machine includes a stator having a plurality of end windings. The electronic machine further includes a plurality of nozzles removably supported by the housing and circumferentially spaced about the axis of rotation. The plurality of nozzles are directed generally radially toward the axis of rotation and toward the plurality of endwindings for spraying a cooling fluid onto respective endwindings of the plurality of endwindings.

Further, an electric motor is disclosed that includes a housing and a rotation group supported for rotation within the housing about an axis of rotation. The electric motor also includes a stator disposed within the housing that is operably coupled to the rotating group. The stator includes a plurality of end windings, and the plurality of end windings collectively define an imaginary end winding outer boundary that extends continuously about the axis of rotation. Furthermore, the electric motor comprises a plurality of nozzles which are removably supported by the housing and which are circumferentially spaced about the axis of rotation in the nozzle arrangement. The plurality of nozzles in the nozzle arrangement are directed generally radially to the axis of rotation and are configured to atomize the cooling fluid and spray the cooling fluid in a common spray profile covering at least a portion of the imaginary end winding outer boundary and onto respective end windings of the plurality of end windings, the common spray profile covering a majority of the imaginary end winding outer boundary in a circumferential direction about the axis of rotation.

Further, a method of manufacturing an electronic machine is disclosed. The method includes providing a housing and supporting a rotating group for rotation about an axis of rotation within the housing. The method further includes inserting the stator into the housing. The stator includes a plurality of end windings. In addition, the method includes removably supporting the plurality of nozzles in the housing to be circumferentially spaced about the axis of rotation. The plurality of nozzles are directed generally radially toward the axis of rotation and toward the plurality of endwindings for spraying a cooling fluid onto respective endwindings of the plurality of endwindings.

Drawings

The present invention is described below in conjunction with the following drawings, wherein like reference numerals denote like elements, and wherein:

FIG. 1 is a schematic diagram of an engine system having a turbine with an electronic machine configured according to an example embodiment of the invention;

FIG. 2 is a schematic longitudinal cross-sectional view of an electronic machine taken along line 2-2 of FIG. 1, according to an example embodiment of the invention;

FIG. 3 is a detailed view of a nozzle tip of the electronic machine of FIG. 2; and is also provided with

Fig. 4 is a cross-sectional view of the nozzle head taken along line 4-4 of fig. 3.

Detailed Description

The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.

Broadly, example embodiments disclosed herein include improved electronic machines, such as electric motors or generators. The electronic machine of the present invention may include a cooling system that provides a cooling fluid, such as a cooling oil, to a stator of the electronic machine. The cooling system may also include one or more (e.g., multiple) outlets (e.g., nozzles, sprayers, etc.) for cooling the oil. The nozzles may be provided in a predetermined arrangement, for example, with respect to the rotational axis of the electronic machine. In some embodiments, the inlet may extend radially through the motor housing, and a nozzle may be provided for directing the spray radially toward the stator (e.g., toward the end windings of the stator).

In some embodiments, the outlets may be included on respective nozzles (i.e., nozzle members) that are removably supported by the housing. The nozzles may be positioned and received within respective chambers of the electronic machine housing. The nozzle may comprise a respective nozzle head having an outlet opening. The nozzle tip may have one or more shaped surfaces or other features for providing a predetermined spray profile from the outlet opening. In some embodiments, the spray profile may be scalloped for providing substantial coverage of the stator end windings.

Further, in some embodiments, a nozzle arrangement may be included that is configured to direct cooling fluid to span a majority of the stator in a circumferential direction. In some embodiments, the spray applied by the plurality of nozzles together may apply the cooling fluid to the entire circumference of the stator end turns. Thus, the "fresh" and "cooled" cooling fluid may be directed at a plurality of angular positions around the circumference of the stator end winding to ensure that cooling is achieved at all or nearly all positions. In this manner, the cooling fluid may be effectively and efficiently delivered to the end turns of the stator. Features of the present invention may help reduce/eliminate under-fog evaporation, coking, and/or deposit formation that may otherwise lead to cooling degradation. The nozzle may provide a favorable amount of cooling fluid atomization. There may be a high degree of atomization and high fluid flow through the electronic machine to provide efficient cooling of the stator.

Furthermore, the electronic machine may include cooling features in a relatively compact package. Electronic machines can be manufactured efficiently and the number of parts can be relatively small for additional manufacturing advantages.

FIG. 1 is a schematic diagram of a fuel cell system 100 having an exemplary turbine 102 of the present invention. In some embodiments, the fuel cell system 100 may be included in a vehicle, such as an automobile, truck, sport utility vehicle, van, motorcycle, or the like. However, it should be understood that the fuel cell system 100 may be configured for different uses without departing from the scope of the invention.

The fuel cell system 100 may include a fuel cell stack 104 that includes a plurality of fuel cells. Hydrogen may be supplied to the fuel cell stack 104 from the tank 106 and oxygen may be supplied to the fuel cell stack 104 to generate electricity through a known chemical reaction. The fuel cell stack 104 may generate electricity for an electrical device such as an electric motor 105. As described, the fuel cell system 100 may be included in a vehicle; thus, in some embodiments, the electric motor 105 may convert electrical energy to mechanical energy to drive and rotate the axle (and thus one or more wheels) of the vehicle.

Oxygen may be provided at least in part by the turbine 102 to the fuel cell stack 104. As will be discussed, the turbine 102 may compress air as it flows to the fuel cell stack 104 to improve the operating efficiency of the fuel cell system 100.

For example, turbine 102 may be configured as a turbocharger having a compressor stage 107 and a turbine stage 116 (both shown schematically). As shown in FIG. 1, the turbine 102 may generally include a rotating group 118 and a casing 119. The rotating group 118 may include a shaft 115 supported by a bearing system 121 for rotation about an axis 120 within a housing 119. Bearing system 121 may have a variety of configurations. For example, the bearing system 121 may include one or more rolling element bearings. In further embodiments, bearing system 121 may include a plain bearing, an air bearing, and/or an oilless bearing. Compressor stage 107 may include a compressor wheel mounted on shaft 115 and supported within a portion of housing 119 (i.e., within the compressor housing). Likewise, the turbine stage 116 may include a turbine wheel mounted on the shaft 115 and supported within a portion of the housing 119 (i.e., within the turbine housing). Shaft 115 may operably couple the wheels of compressor stage 107 and turbine stage 116 such that they rotate as a unit (i.e., collectively define a rotating group 118).

Moreover, in some embodiments, the turbine 102 may be equipped with an electronic machine, such as an electric motor 150. The electric motor 150 may be configured as a radial electric motor. In further embodiments, the electronic machine may be a generator or a combined motor/generator that operates as a motor under some conditions and alternatively operates as a generator under other conditions. The electric motor 150 may include a stator 146 and a rotor 148. A stator 146 may be supported within the housing 119 and a rotor 148 may be operatively attached to the shaft 115 to define a portion of the rotating group 118. During operation, motor 150 may drive rotation group 118 in rotation about axis 120.

Further, during operation of turbine 102, compressor stage 107 may receive an inlet gas stream, which compressor stage 107 compresses into a high pressure gas stream 126, which is channeled to, for example, intercooler 128, and then to fuel cell stack 104. Accordingly, the stack 104 may generate electricity from the hydrogen provided from the tank 106 and the oxygen provided by the high pressure gas stream 126.

Further, the exhaust flow (represented by arrow 130) from the fuel cell stack 104 may be directed back to the turbine stage 116 of the turbine 102. Exhaust flow 130 may drive and rotate rotating group 118 at turbine stage 116 to assist motor portion 112.

Various components of the fuel cell system 100 may be controlled by a control system 134. The control system 134 may be a computerized system having a processor, various sensors, and other components for electrically controlling the operation of the fuel cell stack 104, the motor 150, and/or other features of the system 100. In some embodiments, the control system 134 may define or may be part of an Electrical Control Unit (ECU) of the vehicle.

It should be appreciated that the turbine 102 may have a different configuration than the turbocharger shown in FIG. 1 without departing from the scope of the invention. For example, in some embodiments, the turbine 102 may be configured as an electric motor-assisted fluid compressor (i.e., an eddy-free fluid compressor). Furthermore, the turbine 102 of the present invention may be incorporated into many systems other than fuel cell systems without departing from the scope of the present invention. For example, the turbine 102 of the present invention may be incorporated within an internal combustion engine system for compressing air supplied to the internal combustion engine, or the turbine 102 may be incorporated within another system without departing from the scope of the present invention. Furthermore, the electric motor 150 may be incorporated into or otherwise operatively connected to another machine other than a turbine without departing from the scope of the present invention. In some embodiments, for example, the electric motor 150 of the present disclosure may be configured for use in an electric vehicle traction drive system. As such, the shaft 115 of the electric motor 150 may be an output shaft that provides power to the transmission for driving the shaft to rotate.

Referring now to fig. 1-2, additional features of the electric motor 150 will be discussed. As shown, the housing 119 may include a motor housing 152. The motor housing 152 may be a hollow member defined by two or more portions that are attached together to collectively define a motor chamber 154 therein. The chamber 154 may be cylindrical and substantially centered on the axis of rotation 120. The chamber 154 may be defined by at least one outer radial wall member 158 and an axial end wall 160. The outer radial wall member 158 may cover an outer radial surface of the motor 150 and the axial end wall 160 may cover a first axial end 162 of the motor 150. In some embodiments, compressor stage 107 and motor 150 may be disposed on opposite axial sides of axial end wall 160. Although not specifically shown, the motor chamber 154 may be further defined by an axial end wall disposed on the second axial end 164 of the motor 150 and separating the motor 150 from the turbine stage 116.

The shaft 115 may extend through the motor chamber 154. Rotor 148 may be mounted on shaft 115 within motor chamber 154. The stator 146 may be supported within the motor cavity 154 and may surround the rotor 148.

The electric motor 150 may also include at least one cooling system 166. The cooling system 166 may be configured to remove heat from the motor 150. The cooling system 166 may include at least one fluid inlet 167 that provides coolant (cooling fluid, etc.) to the motor chamber 154. The fluid inlet 167 may be fluidly connected to a plurality of first side inlets 168 and a plurality of second side inlets 169 (fig. 1) of the motor 150. The cooling system 166 may also include at least one fluid outlet, schematically indicated by arrow 170, through which fluid may exit the motor chamber 154.

As shown, the first side inlet 168 may extend through the outer radial wall member 158. In some embodiments, the first side inlet 168 may extend radially along an axis substantially perpendicular to the rotational axis 120. The first side inlet 168 may extend through the outer radial wall member 158 and may be directed along their respective radial axes toward the first axial end 162 of the stator 146. The first side inlet 168 may be axially disposed along the axis 120 to be proximate to the plurality of end windings 155 at the first axial end 162 of the stator 146. The end windings 155 are schematically shown in fig. 1 and 2.

In some embodiments, the first side inlet 168 may be formed by removing material (e.g., by cutting material) from the radial wall member 158. At least one of the first side inlets 168 may be a borehole formed via a drilling process.

There may be any suitable number of first side inlets 168. In some embodiments, there may be a single first side inlet 168. In other embodiments, there may be two or more. In some embodiments, there may be at least three first side inlets 168. As shown in the embodiment of fig. 2, there may be first, second, third and fourth first side inlets 163a, 163b, 163c, 163d.

The second side inlet 169 may also extend through the outer radial wall member 158 and may be substantially similar to the first side inlet 168. However, the second side inlet 169 may be disposed axially along the axis 120 to be proximate the second axial end 164 of the stator 146. The second side inlet 169 may be proximate to a plurality of second end windings 161 (fig. 1) of the stator 146.

The fluid outlet 170 may extend through the outer radial wall member 158. Fluid outlet 170 may be axially disposed between first side inlet 168 and second side inlet 169. In some embodiments, the fluid outlet 170 may be axially disposed at a generally central location relative to the first and second axial ends 162, 164 of the motor 150. The fluid outlet 170 may also extend along an axis substantially perpendicular to the axis of rotation 120. The fluid outlet 170 may be a hole formed via a casting process, via a drilling process, or otherwise.

As shown in fig. 2, at least some of the first side inlets 168 may be disposed vertically on a side of the axis 120 opposite the fluid outlet 170. As will be discussed, the second side inlet 169 may be similarly arranged. Thus, the outlet 170 may be disposed below the outlets of the inlets 168, 169 with respect to the direction of gravity for gravity assisted flow of the cooling fluid.

Further, as shown in fig. 2, the motor 150 may also include a plurality of nozzles 182 (i.e., nozzle members, atomizers, atomizer members, etc.). The first side inlet 168 may include a respective nozzle of a plurality of nozzles 182. The nozzle 182 may be cylindrical, tubular, and hollow so as to define a fluid passage 185 therethrough terminating at the nozzle head 156. The nozzle head 156 may have a variety of configurations without departing from the scope of the invention. For example, in some embodiments shown in fig. 3 and 4, the nozzle head 156 may include a terminal end 165 having a wedge-shaped or triangular recess 186 therein. The groove 186 may be defined by a first surface 187 and a second surface 188 disposed at an acute angle to each other. The first and second surfaces 187, 188 may be at the same angle to the longitudinal axis 183 of the nozzle 182. The wedge-shaped or triangular cross-section (fig. 4) of the groove 186 may be constant along a direction perpendicular to the longitudinal axis 183. The fluid passage 185 may include a reservoir 193 within the nozzle 182, and the passage 185 may include an outlet passage 194 disposed further downstream from the reservoir 193. The outlet passage 194 may have a constant circular cross-sectional shape (taken perpendicular to the longitudinal axis 183), and the outlet passage 194 may extend through the nozzle head 156 and into the recess 186. Thus, the nozzle head 156 may provide a flat fan-shaped spray profile 157 (fig. 2) that gradually increases in width as the spray profile 157 extends in a radially inward direction relative to the axis of rotation 120. In further embodiments, the nozzle head 156 may be configured to provide a jet spray profile or another spray profile.

In some embodiments, a plurality of nozzles 182 of the first side inlet 168 may be arranged in a device 184 about the rotational axis 120 for spraying the cooling fluid generally toward the stator 146. The device 184 may include a first set of the plurality of nozzles 182 (e.g., those of the first inlet 163a and the fourth inlet 163 d) disposed on a first side 191 of the rotational axis 120, and a second set of the plurality of nozzles 182 (e.g., those of the second inlet 163b and the third inlet 163) disposed on an opposite second side 192 of the rotational axis 120. The first side 191 may be disposed above the second side 192 relative to the vertical axis 159 (i.e., the direction of gravity). The cooling fluid outlet 170 may be disposed on the second side 192 for gravity assisted flow of the cooling fluid.

The plurality of nozzles 182 in the apparatus 184 may be spaced apart in a circumferential direction about the axis 120. In some embodiments, the nozzles 182 of the device 184 may be equally spaced apart in the circumferential direction. For example, as shown in fig. 2, the nozzles 182 may be circumferentially spaced about ninety degrees (90 °). Further, the nozzle 182 may be clocked at an angle (e.g., forty-five degrees (45 °)) relative to a coordinate system defined by the rotational axis 120 and the vertical axis 159.

The nozzle 182 may be removably supported in the motor housing 152 with the recess 186 extending tangentially relative to an imaginary circle centered on the axis 120. Thus, the fan spray profile 157 of the nozzle 182 may be directed such that its flat profile is substantially perpendicular to the axis 120 and the width of the profile 157 gradually increases as it extends inwardly toward the axis 120. As shown in fig. 2, the spray profiles 157 of the first and fourth inlets 163a, 163d may be directed radially downward toward the axis of rotation 120, and the spray profiles 157 of the second and third inlets 163b, 163c may be directed radially upward toward the axis of rotation 120. One set of nozzles 182 (e.g., those of the first and second inlets 163a, 163 b) may be disposed horizontally on an opposite side of the axis 120 from the other set of nozzles 182 (e.g., those of the third and fourth inlets 163c, 163 d).

In some embodiments, the nozzles 182 may be arranged such that the common spray profile provided by the plurality of fan spray profiles 157 collectively span around the imaginary circular boundary 171 and provide coverage around the imaginary circular boundary 171 (indicated at 171 in fig. 2). The circular boundary 171 may be defined, for example, by the end windings 155 of the stator 146. In other words, the end windings 155 may be arranged similar to a ring, annulus, etc., and the circular boundary 171 may have a diameter and position defined by the ring/annulus. The circular boundary 171 may also be referred to as an "end winding outer diameter boundary".

The nozzle 182 may be arranged with one or more fan spray profiles 157 to provide at least ninety degrees of coverage across the circular boundary 171. The edges of the fan spray profiles 157 of the plurality of nozzles 182 may extend tangentially relative to the circular boundary 171 and may extend past the circular boundary 171 so as to overlap adjacent ones of the fan spray profiles 157. The spray profiles 157 of the nozzles 182 may collectively span a majority of the circumference around the circular boundary 171. In some embodiments, the spray provided by the nozzles 182 may cover the entire circumference of the circular boundary 171.

Referring back to fig. 1, the second side inlet 169 may be configured similarly to the first side inlet 168. The second side inlet 169 may include a corresponding one of the nozzles 182 and may be disposed in a second arrangement 199 around the second end winding 161 of the stator 146. The second device 199 may be substantially similar to the device 184 of fig. 2 and described above.

During operation, the cooling system 166 may be configured to deliver (e.g., spray, project, etc.) a cooling fluid onto the axial ends 162, 164 of the stator 146. A cooling fluid (e.g., oil or other liquid coolant) may be delivered to the nozzles 182 therein via the inlets 168, 169. The nozzles 182 may provide an atomized spray of cooling fluid to the end windings 155, 161 of the stator 146. The nozzle 182 may provide a spray that substantially covers and coats the end windings 155, 161. The cooling fluid may move from the stator 146 and flow to the outlet 170, thereby convectively removing heat from the motor 150. Thus, the motor 150 can be operated with high efficiency.

The electric motor 150 may be lightweight and compact. Its number of parts may also be relatively small. It should be appreciated that the electric motor 150 may be manufactured efficiently and at a relatively low cost. The motor housing 152 may be manufactured, the inlets 168, 169 may be drilled therein, and the nozzles 182 may be inserted into the inlets 168, 169. The motor 150 may be disposed in a motor housing 152 and the remainder of the turbine 102 may be manufactured and assembled in a conventional manner. Thus, efficient manufacturing techniques may be used to provide cooling system 166.

While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing an exemplary embodiment of the invention. It being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope of the invention as set forth in the appended claims.

Claims

1. An electronic machine, comprising:

a housing;

a rotation group supported for rotation within the housing about an axis of rotation;

a stator disposed within the housing and operatively coupled to the rotating group, the stator comprising a plurality of end windings;

a plurality of nozzles removably supported by the housing and circumferentially spaced about the axis of rotation, the plurality of nozzles generally directed radially toward the axis of rotation and toward the plurality of endwindings for spraying cooling fluid over respective endwindings of the plurality of endwindings.

2. The electronic machine of claim 1, wherein the plurality of nozzles each define a fan-shaped spray profile having a width that progressively increases as the fan-shaped spray profile extends in a radially inward direction relative to the axis of rotation.

3. The electronic machine of claim 2, wherein the plurality of end windings collectively define an imaginary end winding outer diameter boundary extending about the axis, and wherein the fan-shaped spray profiles of the plurality of nozzles are arranged to collectively span a majority of the imaginary end winding outer diameter boundary.

4. The electronic machine of claim 3, wherein the fan-shaped spray profiles of the plurality of nozzles are arranged to collectively span around the entire imaginary end winding outer diameter boundary.

5. The electronic machine of claim 3, wherein the fan-shaped spray profile of one of the plurality of nozzles overlaps the fan-shaped spray profile of an adjacent nozzle of the plurality of nozzles.

6. The electronic machine of claim 2, wherein the plurality of end windings collectively define an imaginary end winding outer diameter boundary extending about the axis, and wherein the fan spray profile of at least one of the plurality of nozzles spans at least 90 degrees of the imaginary end winding outer boundary.

7. The electronic machine of claim 1, wherein the plurality of nozzles comprises at least three nozzles.

8. The electronic machine of claim 7, wherein the plurality of nozzles comprises at least four nozzles.

9. The electronic machine of claim 8, wherein the plurality of nozzles comprises a first nozzle, a second nozzle, a third nozzle, and a fourth nozzle; and is also provided with

Wherein the housing comprises a top side and a bottom side separated by a vertical axis, the first and second nozzles extending through the top side and directed radially downward toward the axis of rotation, and the third and fourth nozzles extending through the bottom side and directed radially upward toward the axis of rotation.

10. The electronic machine according to claim 1, wherein some of the plurality of nozzles are disposed at substantially equal distances in the circumferential direction.

11. The electronic machine of claim 1, wherein the plurality of nozzles each define a fan-shaped spray profile having a width that gradually increases as the fan-shaped spray profile extends in a radially inward direction relative to the axis of rotation, and wherein the fan-shaped spray profile is disposed substantially perpendicular relative to the axis of rotation.

12. An electric motor, comprising:

a housing;

a stator disposed within the housing and operatively coupled to the rotating group, the stator comprising a plurality of end windings that collectively define an imaginary end winding outer boundary that extends continuously about the axis of rotation; and

a plurality of nozzles removably supported by the housing and circumferentially spaced about the axis of rotation in a nozzle arrangement, the plurality of nozzles in the nozzle arrangement being generally radially directed toward the axis of rotation, the plurality of nozzles being configured to atomize a cooling fluid and spray the cooling fluid onto respective ones of the plurality of end windings in a common spray profile that covers at least a portion of the imaginary end winding outer boundary, the common spray profile covering a majority of the imaginary end winding outer boundary in a circumferential direction about the axis of rotation.

13. The electric motor of claim 12, wherein the spray profile covers the entire imaginary end winding outer boundary in the circumferential direction about the axis of rotation.

14. The electric motor of claim 13, wherein at least one of the plurality of nozzles individually provides a fan-shaped spray profile that defines the common spray profile with some other of the plurality of nozzles.

15. The electric motor of claim 14, wherein the fan spray profile of one of the plurality of nozzles overlaps an adjacent spray profile of an adjacent nozzle of the plurality of nozzles.

16. The electric motor of claim 14, wherein the fan spray profile of at least one of the plurality of nozzles spans at least ninety degrees of the imaginary end winding outer boundary.

17. The electronic machine of claim 12, wherein the plurality of nozzles includes a first nozzle, a second nozzle, a third nozzle, and a fourth nozzle; and is also provided with

18. The electric motor of claim 12, wherein some of the plurality of nozzles are disposed at substantially equal distances along the circumferential direction.

19. The electric motor of claim 12, wherein the plurality of nozzles each define a fan spray profile having a width that gradually increases as the fan spray profile extends in a radially inward direction relative to the axis of rotation, and wherein the fan spray profile is disposed substantially perpendicular relative to the axis of rotation.

20. A method of manufacturing an electronic machine, comprising:

providing a housing;

supporting the rotating group for rotation about an axis of rotation within the housing;

inserting a stator into the housing, the stator comprising a plurality of end windings; and is also provided with

A plurality of nozzles in the housing are removably supported to be circumferentially spaced about the axis of rotation, the plurality of nozzles being directed generally radially toward the axis of rotation and toward the plurality of endwindings for spraying a cooling fluid over respective endwindings of the plurality of endwindings.