EP3084924A2 - Electric machine with a rotor cooled by cooling gas - Google Patents

Electric machine with a rotor cooled by cooling gas

Info

Publication number
EP3084924A2
EP3084924A2 EP15708775.0A EP15708775A EP3084924A2 EP 3084924 A2 EP3084924 A2 EP 3084924A2 EP 15708775 A EP15708775 A EP 15708775A EP 3084924 A2 EP3084924 A2 EP 3084924A2
Authority
EP
European Patent Office
Prior art keywords
rotor
channel
channel plate
cooling gas
electrical machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15708775.0A
Other languages
German (de)
French (fr)
Inventor
Marco FESTA
Matthias Centner
Ilja Sabelfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP15708775.0A priority Critical patent/EP3084924A2/en
Publication of EP3084924A2 publication Critical patent/EP3084924A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium

Definitions

  • the invention relates to an electrical machine with a rotor cooled by means of a cooling gas.
  • the rotor In such an electric machine, the rotor is cooled from the outside via its lateral surface.
  • the near-surface flow guidance of the cooling gas is decisive for the effectiveness of the rotor cooling.
  • the cooling gas enters ge ⁇ ′ Neilllich axially from both ends in the air gap between rotor and stator, a, is heated due to rotor losses and windage losses and then exits via ventilating ducts in the stator in the radial direction from the Air gap off.
  • JP H04 156252 A and JP 2003 018772 A each disclose an electrical machine whose stator has cooling channels extending radially to cool its rotor.
  • the invention has the object of providing an electric machine, in particular with regard to the improved rotor cooling ne with a cooled by a cooling gas rotor suits ⁇ ben.
  • An electric machine has a rotor cooled by means of a cooling gas and a stator surrounding the rotor.
  • the stator has a plurality of partial laminated cores, which are arranged in a parallel to an axis of rotation of the rotor ⁇ len axial direction one behind the other and through Flow channels, which are open on the rotor side for supplying the cooling gas to the rotor, are separated from each other.
  • at least one channel plate is provided, which limits a partial laminated core to a flow channel and a rotor-side end portion, which deflects a along the flow channel ver ⁇ continuous cooling gas flow from one to the axis of rotation wei ⁇ send a radial direction.
  • the at least one channel plate By means of the at least one channel plate, it is advantageous to prevent an impingement flow, which is directed from a flow channel perpendicular to the outer surface of the rotor.
  • a precisely vertical impingement flow is disadvantageous, because it has a high pressure loss and spreads on all sides from the center of the impact point, and thereby hinders the Hauptströ ⁇ determination.
  • the high pressure loss would have to be compensated by a high fan pressure and would have a high
  • An embodiment of the invention provides at least a channel pair of plates of two such channel plates, each of the two channel plates is one of two adjacent Operablechpake ⁇ th limited to these laminated-core assemblies separating the flow channel. Through such a channel plate pair, the flow of the
  • a further embodiment of the aforementioned embodiment of the invention provides that the rotor-side end portions of the channel plates of a channel plate pair have flow channel-side surfaces which are formed such that tangential planes to these surfaces in rotor-side edge points of the surfaces are at least approximately parallel to one another and not vanishing angles with one another form ⁇ axis orthogonal plane to the rotation.
  • This refinement advantageously makes it possible to guide the cooling gas flow emerging from a flow channel by means of the surfaces of the rotor-side end sections of the channel plates in a direction which has a component which is tangential to the outer surface of the rotor.
  • a further embodiment of the invention provides that the stator has a channel plate pair for each pair of adjacent partial plate packs.
  • the cooling gas flow can advantageously be directed at the rotor-side end of each flow channel arranged between two adjacent partial laminated cores.
  • a further embodiment of the invention provides that the two channel plates of a channel plate pair are interconnected by at least one support bar.
  • a further embodiment of the invention provides that a rotor-side end portion of a channel plate we ⁇ iquess has a crest at least formed in a direction having a non-zero to the axial direction and the radial direction orthogonal component for directing a cooling gas flow.
  • the cooling gas flow at the rotor end of at least one flow channel also receives a component which is directed orthogonal to the axial direction and tangential to the outer surface of the rotor.
  • Such a component has an advantageous effect on the air friction losses and favors a cooling gas flow running in a spiral around the outer surface of the rotor with a low pressure loss.
  • This embodiment is particularly advantageous when the electric machine is designed for a (preferred) direction of rotation of the rotor.
  • a further embodiment of the invention provides that a rotor-side end portion of at least one channel plate has a stiffening element.
  • a stiffening of an end portion of a channel plate can be produced particularly advantageously if the channel plate is produced as a stamped formed part.
  • a further embodiment of the invention provides that each partial laminated core to the axis of rotation comprises a plurality of ver ⁇ said grooves, are guided through the windings of stator coils of the stator, and that having each channel plate of a partial laminated core to the grooves corresponding recesses.
  • This embodiment of the invention advantageously takes into account that a stator usually has grooves for the stator coils, and adapts the design of the channel plates to this embodiment of a stator.
  • each channel plate is made of a metal or a Metalllegie ⁇ tion.
  • a metal or a metal alloy is particularly advantageous as a material of a channel plate, since it allows a stable and weldable formation of the channel plate. light.
  • sheet metal the term “channel plate” in this application does not necessarily imply that the channel plate is made of a metal or a metal alloy.
  • FIG. 1 shows schematically a section of a longitudinal section through an electrical machine
  • FIG. 2 is a perspective view of a portion of a first channel plate
  • FIG. 3 shows a perspective view of a portion of a second channel plate
  • FIG. 4 shows a perspective view of a portion of a third channel plate.
  • FIG. 1 shows a detail of a longitudinal section through ei ⁇ ne electric machine 1 having a rotor 3 and a surrounding the Ro ⁇ tor stator 5.
  • the rotor 3 is rotatably supported about a rotation axis 7 and formed in a substantially circular cylindrical shape, wherein the cylinder axis coincides with the axis of rotation 7 coincides.
  • the cylinder jacket-shaped outer surface 9 of the rotor 3 is separated from the stator 5 by an air gap 11.
  • the stator 5 has a plurality in a to the rotation axis 7 pa ⁇ rallelen axial direction successively arranged partial laminated cores 13.
  • Each partial laminated core 13 is essentially Chen annularly formed around the rotation axis 7 around and has a plurality of around the axis of rotation 7 around distributed (not shown in Figure 1) grooves through which in each case in a known manner (in Figure 1 also not shown) windings of stator coils of the stator 5 are performed.
  • Ange ⁇ indicated are also behind the plane extending conductor 15, which are part of the stator coils, in a deviating from the rest of the representation of Figure 1 perspective view.
  • the partial laminated cores 13 are separated from one another by flow channels 23 which are open on the rotor side, ie to the air gap 11. Through the flow channels 23 is for cooling the Ro ⁇ tors 3 a cooling gas, such as air, out into the air gap 11 and thus to the outer surface 9 of the rotor. 3
  • a cooling gas such as air
  • Each partial laminated core 13 includes at each side which faces an adjacent ⁇ be partial laminated core 13, a channel plate 17, 19 which limits the portion of the laminated core 13 to the local flow duct 23rd
  • each partial laminated core 13 has on one side a first channel plate 17 and on the opposite side a second channel plate 19, wherein these two channel plates 17, 19 differ from each other.
  • FIG. 1 shows a perspective view of a section of a first channel from ⁇ sheet 17th
  • Figure 3 shows a perspective view of a section of a second channel from ⁇ sheet nineteenth
  • the channel plates 17, 19 have rotor-side end portions 17.1, 19.1 which are adapted to extending through the Strö ⁇ mung channels 23 cooling gas flows out to the Rota ⁇ tion shaft 7 facing radial directions deflect.
  • the cooling gas flows are shown in FIG. 1 by streamlines 25.
  • the rotor side end portion of a first channel plate 17 is a krallenar ⁇ term curvature and the rotor-side end portion 19.1 of a second channel plate 19 is bent.
  • the Endab- are sections 17.1, 19.1 configured such that tangential planes are parallel to each other at their surfaces in the rotor-side edge points of these surfaces at least approximately and, depending ⁇ wells form a non-zero angle with a plane orthogonal to the axis of rotation 7 level.
  • the cooling gas flows exiting from a flow channel 23 into the air gap 11 are deflected approximately at the angles from the radial directions pointing to the rotation axis and thus have tangential and axially directed components to the outer surface 9 of the rotor 3.
  • Each first channel plate 17 further includes a support bar 27 which serves as a spacer between adjacent partial laminated cores 13 and is welded, for example, to the second channel plate 19, which forms a channel plate pair with the first channel plate 17.
  • Each channel plate 17, 19 also has recesses 29 corresponding to the grooves of the partial laminated core 13 bounded by it.
  • Figure 4 shows a perspective view of a Ab ⁇ section of a third channel plate 21, which may limit a partial laminated core 13 as an alternative to the second channel plate 19 shown in Figure 3.
  • a third channel plate 21 has egg NEN rotor-side end portion 21.1 in which, like the rotor side end portion 19.1 of the second channel plate is umgebo ⁇ gen 19, but additionally has two ridges 21.3, each ⁇ wells for directing a cooling gas flow in a direction having a is formed non-vanishing to the axial direction and to the radial direction orthogonal component.
  • the combs 21.3 are generated in the embodiment shown in Figure 4 by bending a corner region and egg ⁇ nes middle region of the end portion 21.1, including the end portion 21.1 is cut in the middle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The invention relates to an electric machine (1) comprising a rotor (3) cooed by a cooling gas and a stator (5) which surrounds the rotor (3) and which comprises several partially laminated cores (13). Said partially laminated cores (13) are successively arranged in an axial direction which is parallel to a rotational axis (7) of the rotor (3) and are separated from each other by flow channels (23) which are open on the rotor side for guiding the cooling gas to the rotor (3).

Description

Beschreibung description
Elektrische Maschine mit durch Kühlgas gekühltem Rotor Die Erfindung betrifft eine elektrische Maschine mit einem mittels eines Kühlgases gekühlten Rotor. The invention relates to an electrical machine with a rotor cooled by means of a cooling gas.
Bei einer derartigen elektrischen Maschine wird der Rotor von außen über dessen Mantelfläche gekühlt. Dabei ist die ober- flächennahe Strömungsführung des Kühlgases maßgebend für die Effektivität der Rotorkühlung. Bei großen Maschinen, deren Rotoren auf diese Weise gekühlt werden, tritt das Kühlgas ge¬ wöhnlich axial von beiden Enden in den Luftspalt zwischen Rotor und Stator ein, wird aufgrund von Rotorverlusten und Luftreibungsverlusten erwärmt und tritt dann über Ventilationskanäle im Stator in radialer Richtung aus dem Luftspalt aus . In such an electric machine, the rotor is cooled from the outside via its lateral surface. Here, the near-surface flow guidance of the cooling gas is decisive for the effectiveness of the rotor cooling. For large machines, the rotors of which are cooled in this manner, the cooling gas enters ge ¬ wöhnlich axially from both ends in the air gap between rotor and stator, a, is heated due to rotor losses and windage losses and then exits via ventilating ducts in the stator in the radial direction from the Air gap off.
JP H04 156252 A und JP 2003 018772 A offenbaren jeweils eine elektrische Maschine, deren Stator zur Kühlung ihres Rotors radial verlaufende Kühlkanäle aufweist. JP H04 156252 A and JP 2003 018772 A each disclose an electrical machine whose stator has cooling channels extending radially to cool its rotor.
Der Erfindung liegt die Aufgabe zugrunde, eine insbesondere hinsichtlich der Rotorkühlung verbesserte elektrische Maschi- ne mit einem mittels eines Kühlgases gekühlten Rotor anzuge¬ ben . The invention has the object of providing an electric machine, in particular with regard to the improved rotor cooling ne with a cooled by a cooling gas rotor suits ¬ ben.
Die Aufgabe wird erfindungsgemäß durch die Merkmale des An¬ spruchs 1 gelöst. The object is achieved by the features of claim 1. An ¬ .
Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche. Advantageous embodiments of the invention are the subject of the dependent claims.
Eine erfindungsgemäße elektrische Maschine weist einen mit- tels eines Kühlgases gekühlten Rotor und einen den Rotor umgebenden Stator auf. Der Stator weist mehrere Teilblechpakete auf, die in einer zu einer Rotationsachse des Rotors paralle¬ len axialen Richtung hintereinander angeordnet und durch Strömungskanäle, die rotorseitig zur Zuführung des Kühlgases zu dem Rotor offen sind, voneinander getrennt sind. Dabei ist wenigstens ein Kanalblech vorgesehen, das ein Teilblechpaket zu einem Strömungskanal begrenzt und einen rotorseitigen End- abschnitt aufweist, der eine entlang des Strömungskanals ver¬ laufende Kühlgasströmung aus einer zu der Rotationsachse wei¬ senden radialen Richtung ablenkt. An electric machine according to the invention has a rotor cooled by means of a cooling gas and a stator surrounding the rotor. The stator has a plurality of partial laminated cores, which are arranged in a parallel to an axis of rotation of the rotor ¬ len axial direction one behind the other and through Flow channels, which are open on the rotor side for supplying the cooling gas to the rotor, are separated from each other. Here, at least one channel plate is provided, which limits a partial laminated core to a flow channel and a rotor-side end portion, which deflects a along the flow channel ver ¬ continuous cooling gas flow from one to the axis of rotation wei ¬ send a radial direction.
Durch die zwischen den Teilblechpaketen angeordneten Strö- mungskanäle kann der Rotor direkt mit Kühlgas beströmt wer¬ den, wodurch der Rotor vorteilhaft effektiver mit dem Kühlgas beströmt werden kann als mittels der bekannten axialen Einleitung von Kühlgas in den Luftspalt zwischen Stator und Rotor, weil das Verhältnis zwischen einem durch eine Wärmeüber- gangszahl erzielten Nutzen und einem durch die Strömungsleistung bestimmten Aufwand verbessert wird. Can mung channels through the arranged between the partial laminated cores currents of the rotor directly to the cooling gas flow-type ¬ the, whereby the rotor can advantageously be effectively made to flow through the cooling gas as a means of the known axial discharge of cooling gas in the air gap between stator and rotor, because the ratio between a benefit achieved by a heat transfer coefficient and an effort determined by the flow rate.
Durch das wenigstens eine Kanalblech wird vorteilhaft eine Prallströmung, die aus einem Strömungskanal senkrecht auf die Außenoberfläche des Rotors gerichtet ist, verhindert. Eine genau senkrechte Prallströmung ist nachteilig, da sie einen hohen Druckverlust zur Folge hat und sich vom Zentrum des Prallpunktes allseitig ausbreitet und dadurch die Hauptströ¬ mung behindert. Der hohe Druckverlust müsste durch einen ho- hen Lüfterdruck ausgeglichen werden und hätte einen hohenBy means of the at least one channel plate, it is advantageous to prevent an impingement flow, which is directed from a flow channel perpendicular to the outer surface of the rotor. A precisely vertical impingement flow is disadvantageous, because it has a high pressure loss and spreads on all sides from the center of the impact point, and thereby hinders the Hauptströ ¬ determination. The high pressure loss would have to be compensated by a high fan pressure and would have a high
Leistungsbedarf eines den Lüfterdruck erzeugenden Lüfters zur Folge . Power requirement of the fan pressure generating fan result.
Eine Ausgestaltung der Erfindung sieht wenigstens ein Kanal- blechpaar zweier derartiger Kanalbleche vor, wobei jedes der beiden Kanalbleche eines von zwei benachbarten Teilblechpake¬ ten zu dem diese Teilblechpakete trennenden Strömungskanal begrenzt . Durch ein derartiges Kanalblechpaar kann die Strömung desAn embodiment of the invention provides at least a channel pair of plates of two such channel plates, each of the two channel plates is one of two adjacent Teilblechpake ¬ th limited to these laminated-core assemblies separating the flow channel. Through such a channel plate pair, the flow of the
Kühlgases durch einen Strömungskanal von zwei Seiten und da¬ mit noch effektiver gelenkt werden. Eine Weitergestaltung der vorgenannten Ausgestaltung der Erfindung sieht vor, dass die rotorseitigen Endabschnitte der Kanalbleche eines Kanalblechpaares strömungskanalseitige Oberflächen aufweisen, die derart ausgebildet sind, dass Tan- gentialebenen an diese Oberflächen in rotorseitigen Randpunkten der Oberflächen wenigstens annähernd zueinander parallel sind und nicht verschwindende Winkel mit einer zur Rotation¬ sachse orthogonalen Ebene bilden. Diese Weitergestaltung ermöglicht vorteilhaft eine Lenkung der aus einem Strömungskanal austretenden Kühlgasströmung mittels der Oberflächen der rotorseitigen Endabschnitte der Kanalbleche in eine Richtung, die eine zur Außenoberfläche des Rotors tangentiale Komponente aufweist. Cooling gas through a flow channel from two sides and there ¬ be steered even more effective. A further embodiment of the aforementioned embodiment of the invention provides that the rotor-side end portions of the channel plates of a channel plate pair have flow channel-side surfaces which are formed such that tangential planes to these surfaces in rotor-side edge points of the surfaces are at least approximately parallel to one another and not vanishing angles with one another form ¬ axis orthogonal plane to the rotation. This refinement advantageously makes it possible to guide the cooling gas flow emerging from a flow channel by means of the surfaces of the rotor-side end sections of the channel plates in a direction which has a component which is tangential to the outer surface of the rotor.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass der Stator für jedes Paar benachbarter Teilblechpakete ein Kanalblechpaar aufweist. Durch diese Ausgestaltung der Erfindung kann vorteilhaft die Kühlgasströmung am rotorseitigen Ende jedes zwischen zwei benachbarten Teilblechpaketen angeordneten Strömungskanals gelenkt werden. Eine weitere Ausgestaltung der Erfindung sieht vor, dass die beiden Kanalbleche eines Kanalblechpaares durch wenigstens einen Stützsteg miteinander verbunden sind. A further embodiment of the invention provides that the stator has a channel plate pair for each pair of adjacent partial plate packs. By means of this embodiment of the invention, the cooling gas flow can advantageously be directed at the rotor-side end of each flow channel arranged between two adjacent partial laminated cores. A further embodiment of the invention provides that the two channel plates of a channel plate pair are interconnected by at least one support bar.
Dadurch kann vorteilhaft mittels wenigstens eines Stützsteges ein Abstand zwischen zwei Teilblechpaketen festgelegt werden. This can advantageously be determined by means of at least one support web, a distance between two partial laminated cores.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass ein rotorseitiger Endabschnitt wenigstens eines Kanalbleches we¬ nigstens einen Kamm aufweist, der zur Lenkung einer Kühlgas- Strömung in eine Richtung mit einer nicht verschwindenden zu der axialen Richtung und zu der radialen Richtung orthogonalen Komponente ausgebildet ist. Dadurch erhält die Kühlgasströmung am rotorseitigen Ende wenigstens eines Strömungskanals auch eine Komponente, die orthogonal zur axialen Richtung und tangential zu der Außenoberfläche des Rotors gerichtet ist. Eine derartige Komponen- te wirkt sich vorteilhaft auf die Luftreibungsverluste aus und begünstigt eine spiralförmig um die Außeroberfläche des Rotors verlaufende Kühlgasströmung mit einem geringen Druckverlust. Diese Ausgestaltung ist besonders vorteilhaft, wenn die elektrische Maschine für eine (Vorzugs-) Drehrichtung des Rotors ausgelegt ist. A further embodiment of the invention provides that a rotor-side end portion of a channel plate we ¬ nigstens has a crest at least formed in a direction having a non-zero to the axial direction and the radial direction orthogonal component for directing a cooling gas flow. As a result, the cooling gas flow at the rotor end of at least one flow channel also receives a component which is directed orthogonal to the axial direction and tangential to the outer surface of the rotor. Such a component has an advantageous effect on the air friction losses and favors a cooling gas flow running in a spiral around the outer surface of the rotor with a low pressure loss. This embodiment is particularly advantageous when the electric machine is designed for a (preferred) direction of rotation of the rotor.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass ein rotorseitiger Endabschnitt wenigstens eines Kanalbleches ein Versteifungselement aufweist. A further embodiment of the invention provides that a rotor-side end portion of at least one channel plate has a stiffening element.
Eine Versteifung eines Endabschnittes eines Kanalbleches ist besonders vorteilhaft herstellbar, wenn das Kanalblech als Stanzumformteil hergestellt wird. Eine weitere Ausgestaltung der Erfindung sieht vor, dass jedes Teilblechpaket mehrere um die Rotationsachse herum ver¬ teilte Nuten aufweist, durch die Windungen von Statorspulen des Stators geführt sind, und dass jedes Kanalblech eines Teilblechpakets zu den Nuten korrespondierende Aussparungen aufweist. A stiffening of an end portion of a channel plate can be produced particularly advantageously if the channel plate is produced as a stamped formed part. A further embodiment of the invention provides that each partial laminated core to the axis of rotation comprises a plurality of ver ¬ said grooves, are guided through the windings of stator coils of the stator, and that having each channel plate of a partial laminated core to the grooves corresponding recesses.
Diese Ausgestaltung der Erfindung berücksichtigt vorteilhaft, dass ein Stator üblicherweise Nuten für die Statorspulen aufweist, und passt die Gestaltung der Kanalbleche dieser Aus- bildung eines Stators an. This embodiment of the invention advantageously takes into account that a stator usually has grooves for the stator coils, and adapts the design of the channel plates to this embodiment of a stator.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass jedes Kanalblech aus einem Metall oder aus einer Metalllegie¬ rung gefertigt ist. A further embodiment of the invention provides that each channel plate is made of a metal or a Metalllegie ¬ tion.
Ein Metall oder eine Metalllegierung eignet sich besonders vorteilhaft als Material eines Kanalbleches, da es eine stabile und verschweißbare Ausbildung des Kanalbleches ermög- licht. In diesem Zusammenhang wird darauf hingewiesen, dass entgegen der üblichen Bedeutung des Wortes "Blech" der Begriff "Kanalblech" in dieser Anmeldung nicht notwendig impliziert, dass das Kanalblech aus einem Metall oder einer Me- talllegierung gefertigt ist. A metal or a metal alloy is particularly advantageous as a material of a channel plate, since it allows a stable and weldable formation of the channel plate. light. In this context, it should be noted that contrary to the usual meaning of the word "sheet metal" the term "channel plate" in this application does not necessarily imply that the channel plate is made of a metal or a metal alloy.
Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusam- menhang mit der folgenden Beschreibung von Ausführungsbeispielen, die im Zusammenhang mit den Zeichnungen näher erläutert werden. Dabei zeigen: The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of exemplary embodiments, which will be explained in more detail in connection with the drawings. Showing:
FIG 1 schematisch einen Ausschnitt eines Längsschnittes durch eine elektrische Maschine, 1 shows schematically a section of a longitudinal section through an electrical machine,
FIG 2 eine perspektivische Darstellung eines Abschnitts eines ersten Kanalblechs, 2 is a perspective view of a portion of a first channel plate,
FIG 3 eine perspektivische Darstellung eines Abschnitts eines zweiten Kanalblechs, und 3 shows a perspective view of a portion of a second channel plate, and
FIG 4 eine perspektivische Darstellung eines Abschnitts eines dritten Kanalblechs. 4 shows a perspective view of a portion of a third channel plate.
Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen. Corresponding parts are provided in all figures with the same reference numerals.
Figur 1 zeigt einen Ausschnitt eines Längsschnittes durch ei¬ ne elektrische Maschine 1 mit einem Rotor 3 und einem den Ro¬ tor umgebenden Stator 5. Der Rotor 3 ist um eine Rotationsachse 7 rotierbar gelagert und im Wesentlichen kreiszylinderförmig ausgebildet, wobei die Zylinderachse mit der Rotationsachse 7 zusammenfällt. Die zylindermantelförmige Außenoberfläche 9 des Rotors 3 ist durch einen Luftspalt 11 von dem Stator 5 getrennt. 1 shows a detail of a longitudinal section through ei ¬ ne electric machine 1 having a rotor 3 and a surrounding the Ro ¬ tor stator 5. The rotor 3 is rotatably supported about a rotation axis 7 and formed in a substantially circular cylindrical shape, wherein the cylinder axis coincides with the axis of rotation 7 coincides. The cylinder jacket-shaped outer surface 9 of the rotor 3 is separated from the stator 5 by an air gap 11.
Der Stator 5 weist mehrere in einer zur Rotationsachse 7 pa¬ rallelen axialen Richtung hintereinander angeordnete Teilblechpakete 13 auf. Jedes Teilblechpaket 13 ist im Wesentli- chen kreisringförmig um die Rotationsachse 7 herum ausgebildet und weist mehrere um die Rotationsachse 7 herum verteilte (in Figur 1 nicht dargestellte) Nuten auf, durch die jeweils in bekannter Weise (in Figur 1 ebenfalls nicht dargestellten) Windungen von Statorspulen des Stators 5 geführt sind. Ange¬ deutet sind ferner hinter der Zeichenebene verlaufende Leiter 15, die Teil der Statorspulen sind, in einer von der übrigen Darstellung der Figur 1 abweichenden perspektivischen Darstellung . The stator 5 has a plurality in a to the rotation axis 7 pa ¬ rallelen axial direction successively arranged partial laminated cores 13. Each partial laminated core 13 is essentially Chen annularly formed around the rotation axis 7 around and has a plurality of around the axis of rotation 7 around distributed (not shown in Figure 1) grooves through which in each case in a known manner (in Figure 1 also not shown) windings of stator coils of the stator 5 are performed. Ange ¬ indicated are also behind the plane extending conductor 15, which are part of the stator coils, in a deviating from the rest of the representation of Figure 1 perspective view.
Die Teilblechpakete 13 sind voneinander durch Strömungskanäle 23 getrennt, die rotorseitig, d. h. zu dem Luftspalt 11 offen sind. Durch die Strömungskanäle 23 wird zur Kühlung des Ro¬ tors 3 ein Kühlgas, beispielsweise Luft, in den Luftspalt 11 und damit zu der Außenoberfläche 9 des Rotors 3 geführt. The partial laminated cores 13 are separated from one another by flow channels 23 which are open on the rotor side, ie to the air gap 11. Through the flow channels 23 is for cooling the Ro ¬ tors 3 a cooling gas, such as air, out into the air gap 11 and thus to the outer surface 9 of the rotor. 3
Jedes Teilblechpaket 13 weist an jeder Seite, die einem be¬ nachbarten Teilblechpaket 13 zugewandt ist, ein Kanalblech 17, 19 auf, das das Teilblechpaket 13 zu dem dortigen Strö- mungskanal 23 begrenzt. Dabei weist jedes Teilblechpaket 13 an einer Seite ein erstes Kanalblech 17 und an der gegenüber liegenden Seite ein zweites Kanalblech 19 auf, wobei sich diese beiden Kanalbleche 17, 19 voneinander unterscheiden. Ferner werden je zwei benachbarte Teilblechpakete 13 zu dem diese Teilblechpakete 13 trennenden Strömungskanal 23 von zwei verschiedenen Kanalblechen 17, 19 begrenzt, d. h. von einem ersten Kanalblech 17 und einem zweiten Kanalblech 19, die jeweils eines der beiden Teilblechpakete 13 zu dem Strö- mungskanal 23 begrenzen. Die beiden Kanalbleche 17, 19 eines derartigen Kanalblechpaares bilden einander gegenüber liegende Wände des Strömungskanals 23 und werden im Folgenden an¬ hand der Figuren 2 und 3 näher beschrieben. Figur 2 zeigt eine perspektivische Darstellung eines Ab¬ schnitts eines ersten Kanalblechs 17. Figur 3 zeigt eine perspektivische Darstellung eines Ab¬ schnitts eines zweiten Kanalblechs 19. Each partial laminated core 13 includes at each side which faces an adjacent ¬ be partial laminated core 13, a channel plate 17, 19 which limits the portion of the laminated core 13 to the local flow duct 23rd In this case, each partial laminated core 13 has on one side a first channel plate 17 and on the opposite side a second channel plate 19, wherein these two channel plates 17, 19 differ from each other. In addition, two adjacent partial laminated cores 13 are delimited by the flow channel 23 which separates these partial laminated cores 13 from two different channel plates 17, 19, ie from a first channel plate 17 and a second channel plate 19, each delimiting one of the two partial plate packets 13 to the flow channel 23 , The two channel plates 17, 19 of such a channel plate pair form opposing walls of the flow channel 23 and the Figures 2 and 3 are described in detail in the following on hand ¬. Figure 2 shows a perspective view of a section of a first channel from ¬ sheet 17th Figure 3 shows a perspective view of a section of a second channel from ¬ sheet nineteenth
Die Kanalbleche 17, 19 weisen rotorseitige Endabschnitte 17.1, 19.1 auf, die dazu ausgebildet sind, durch die Strö¬ mungskanäle 23 verlaufende Kühlgasströmungen aus zu der Rota¬ tionsachse 7 weisenden radialen Richtungen abzulenken. Die Kühlgasströmungen sind in Figur 1 durch Stromlinien 25 dargestellt . The channel plates 17, 19 have rotor-side end portions 17.1, 19.1 which are adapted to extending through the Strö ¬ mung channels 23 cooling gas flows out to the Rota ¬ tion shaft 7 facing radial directions deflect. The cooling gas flows are shown in FIG. 1 by streamlines 25.
Zur Strömungsführung des Kühlgases weist der rotorseitige Endabschnitt 17.1 eines ersten Kanalblechs 17 eine krallenar¬ tige Wölbung auf und der rotorseitige Endabschnitt 19.1 eines zweiten Kanalblechs 19 ist umgebogen. Dabei sind die Endab- schnitte 17.1, 19.1 derart ausgebildet, dass Tangentialebenen an ihre Oberflächen in rotorseitigen Randpunkten dieser Oberflächen wenigstens annähernd zueinander parallel sind und je¬ weils einen nicht verschwindenden Winkel mit einer zur Rotationsachse 7 orthogonalen Ebene bilden. Dadurch werden die aus einem Strömungskanal 23 in den Luftspalt 11 austretenden Kühlgasströmungen jeweils etwa um die Winkel aus den zu der Rotationsachse weisenden radialen Richtungen abgelenkt und weisen somit zur Außenoberfläche 9 des Rotors 3 tangentiale und axial gerichtete Komponenten auf. For guiding the flow of the cooling gas 17.1, the rotor side end portion of a first channel plate 17 is a krallenar ¬ term curvature and the rotor-side end portion 19.1 of a second channel plate 19 is bent. The Endab- are sections 17.1, 19.1 configured such that tangential planes are parallel to each other at their surfaces in the rotor-side edge points of these surfaces at least approximately and, depending ¬ weils form a non-zero angle with a plane orthogonal to the axis of rotation 7 level. As a result, the cooling gas flows exiting from a flow channel 23 into the air gap 11 are deflected approximately at the angles from the radial directions pointing to the rotation axis and thus have tangential and axially directed components to the outer surface 9 of the rotor 3.
Optional weisen die Endabschnitte 17.1, 19.1 ferner Verstei¬ fungselemente 17.2, 19.2 auf, die beispielsweise als Einker¬ bungen ausgebildet sind. Jedes erste Kanalblech 17 weist ferner einen Stützsteg 27 auf, der als Abstandshalter zwischen benachbarten Teilblechpaketen 13 dient und beispielsweise mit dem zweiten Kanal¬ blech 19 verschweißt wird, das mit dem ersten Kanalblech 17 ein Kanalblechpaar bildet. Optionally have the end portions 17.1, 19.1 also auctioning ¬ Fung elements 17.2, 19.2, which are for example formed as Einker ¬ environments. Each first channel plate 17 further includes a support bar 27 which serves as a spacer between adjacent partial laminated cores 13 and is welded, for example, to the second channel plate 19, which forms a channel plate pair with the first channel plate 17.
Jedes Kanalblech 17, 19 weist ferner zu den Nuten des von ihm begrenzten Teilblechpaketes 13 korrespondierende Aussparungen 29 auf. Figur 4 zeigt eine perspektivische Darstellung eines Ab¬ schnitts eines dritten Kanalblechs 21, das alternativ zu dem in Figur 3 dargestellten zweiten Kanalblech 19 ein Teilblechpaket 13 begrenzen kann. Ein drittes Kanalblech 21 weist ei- nen rotorseitigen Endabschnitt 21.1 auf, der wie der rotor- seitige Endabschnitt 19.1 des zweiten Kanalblechs 19 umgebo¬ gen ist, aber zusätzlich zwei Kämme 21.3 aufweist, die je¬ weils zur Lenkung einer Kühlgasströmung in eine Richtung mit einer nicht verschwindenden zu der axialen Richtung und zu der radialen Richtung orthogonalen Komponente ausgebildet ist. Die Kämme 21.3 werden in dem in Figur 4 dargestellten Ausführungsbeispiel durch Umbiegen eines Eckbereiches und ei¬ nes Mittelbereiches des Endabschnitts 21.1 erzeugt, wozu der Endabschnitt 21.1 in der Mitte eingeschnitten ist. Each channel plate 17, 19 also has recesses 29 corresponding to the grooves of the partial laminated core 13 bounded by it. Figure 4 shows a perspective view of a Ab ¬ section of a third channel plate 21, which may limit a partial laminated core 13 as an alternative to the second channel plate 19 shown in Figure 3. A third channel plate 21 has egg NEN rotor-side end portion 21.1 in which, like the rotor side end portion 19.1 of the second channel plate is umgebo ¬ gen 19, but additionally has two ridges 21.3, each ¬ weils for directing a cooling gas flow in a direction having a is formed non-vanishing to the axial direction and to the radial direction orthogonal component. The combs 21.3 are generated in the embodiment shown in Figure 4 by bending a corner region and egg ¬ nes middle region of the end portion 21.1, including the end portion 21.1 is cut in the middle.

Claims

Patentansprüche claims
1. Elektrische Maschine (1) 1. Electric machine (1)
- mit einem mittels eines Kühlgases gekühlten Rotor (3) - und einem den Rotor (3) umgebenden Stator (5) , der mehrere Teilblechpakete (13) aufweist,  with a rotor (3) cooled by means of a cooling gas and a stator (5) surrounding the rotor (3), which has a plurality of partial laminated cores (13),
- wobei die Teilblechpakete (13) in einer zu einer Rotation¬ sachse (7) des Rotors (3) parallelen axialen Richtung hintereinander angeordnet - Wherein the partial laminated cores (13) in a to a rotation axis ¬ (7) of the rotor (3) parallel axial direction arranged one behind the other
- und durch Strömungskanäle (23) , die rotorseitig zur Zufüh¬ rung des Kühlgases zu dem Rotor (3) offen sind, voneinander getrennt sind, - And by flow channels (23), the rotor side for Zufüh ¬ tion of the cooling gas to the rotor (3) are open, are separated from each other,
gekennzeichnet durch wenigstens ein Kanalblech (17, 19, 21), das ein Teilblechpaket (13) zu einem Strömungskanal (23) begrenzt und einen rotorseitigen Endabschnitt (17.1, 19.1,characterized by at least one channel plate (17, 19, 21) which delimits a partial laminated core (13) to form a flow channel (23) and has a rotor-side end section (17.1, 19.1,
21.1) aufweist, der eine entlang des Strömungskanals (23) verlaufende Kühlgasströmung aus einer zu der Rotationsachse (7) weisenden radialen Richtung ablenkt. 2. Elektrische Maschine (1) nach Anspruch 1, 21.1), which deflects a cooling gas flow extending along the flow channel (23) from a radial direction pointing to the rotation axis (7). 2. Electrical machine (1) according to claim 1,
gekennzeichnet durch wenigstens ein Kanalblechpaar zweier Kanalbleche (17, 19, 21), die jeweils eines von zwei benachbar¬ ten Teilblechpaketen (13) zu dem diese Teilblechpakete (13) trennenden Strömungskanal (23) begrenzen. characterized by at least one channel plate pair of two channel plates (17, 19, 21), each one of two neigh ¬ ten partial laminated cores (13) to this part of the laminated cores (13) separating the flow channel (23) limit.
3. Elektrische Maschine (1) nach Anspruch 2, 3. Electrical machine (1) according to claim 2,
dadurch gekennzeichnet, dass die rotorseitigen Endabschnitte (17.1, 19.1, 21.1) der Kanalbleche (17, 19, 21) eines Kanal¬ blechpaares strömungskanalseitige Oberflächen aufweisen, die derart ausgebildet sind, dass Tangentialebenen an diese Ober¬ flächen in rotorseitigen Randpunkten der Oberflächen wenigstens annähernd zueinander parallel sind und nicht verschwin¬ dende Winkel ( ) mit einer zur Rotationsachse (7) orthogona¬ len Ebene bilden. characterized in that the rotor-side end portions (17.1, 19.1, 21.1) of the channel plates (17, 19, 21) of a channel ¬ plate pair have flow channel side surfaces which are formed such that tangential planes at these upper ¬ surfaces in rotor-side edge points of the surfaces at least approximately are parallel to each other and not disappearance ¬ Dende angle () with an axis of rotation (7) orthogona ¬ len plane form.
4. Elektrische Maschine (1) nach Anspruch 2 oder 3, 4. Electrical machine (1) according to claim 2 or 3,
dadurch gekennzeichnet, dass der Stator (5) für jedes Paar benachbarter Teilblechpakete (13) ein Kanalblechpaar aufweist. characterized in that the stator (5) for each pair adjacent partial laminated cores (13) has a channel plate pair.
5. Elektrische Maschine (1) nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die beiden Kanalbleche (17, 19,5. Electrical machine (1) according to one of claims 2 to 4, characterized in that the two channel plates (17, 19,
21) eines Kanalblechpaares durch wenigstens einen Stützsteg (27) miteinander verbunden sind. 21) of a channel plate pair by at least one support web (27) are interconnected.
6. Elektrische Maschine (1) nach einem der vorhergehenden An- Sprüche, 6. Electrical machine (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass ein rotorseitiger Endabschnitt (17.1, 19.1, 21.1) wenigstens eines Kanalbleches (17, 19, 21) wenigstens einen Kamm (21.3) aufweist, der zur Lenkung einer Kühlgasströmung in eine Richtung mit einer nicht verschwin- denden zu der axialen Richtung und zu der radialen Richtung orthogonalen Komponente ausgebildet ist. characterized in that a rotor-side end portion (17.1, 19.1, 21.1) at least one channel plate (17, 19, 21) at least one comb (21.3), which is for guiding a cooling gas flow in a direction with a non-vanishing to the axial direction and formed to the radial direction orthogonal component.
7. Elektrische Maschine (1) nach einem der vorhergehenden Ansprüche, 7. Electrical machine (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass ein rotorseitiger Endabschnittcharacterized in that a rotor-side end portion
(17.1, 19.1, 21.1) wenigstens eines Kanalbleches (17, 19, 21) ein Versteifungselement (17.2, 19.2) aufweist. (17.1, 19.1, 21.1) at least one channel plate (17, 19, 21) has a stiffening element (17.2, 19.2).
8. Elektrische Maschine (1) nach einem der vorhergehenden An- Sprüche, 8. Electrical machine (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass jedes Teilblechpaket (13) mehre¬ re um die Rotationsachse (7) herum verteilte Nuten aufweist, durch die Windungen von Statorspulen des Stators (5) geführt sind, und dass jedes Kanalblech (17, 19, 21) eines Teilblech- paketes (13) zu den Nuten korrespondierende Aussparungen (29) aufweist . characterized in that each partial laminated core (13) has several ¬ re about the rotational axis (7) around distributed grooves, are guided through the windings of stator coils of the stator (5), and that each channel plate (17, 19, 21) of a Teilblech- packet (13) to the grooves corresponding recesses (29).
9. Elektrische Maschine (1) nach einem der vorhergehenden Ansprüche, 9. Electrical machine (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass jedes Kanalblech (17, 19, 21) aus einem Metall oder aus einer Metalllegierung gefertigt ist . characterized in that each channel plate (17, 19, 21) is made of a metal or a metal alloy.
EP15708775.0A 2014-03-06 2015-02-26 Electric machine with a rotor cooled by cooling gas Withdrawn EP3084924A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15708775.0A EP3084924A2 (en) 2014-03-06 2015-02-26 Electric machine with a rotor cooled by cooling gas

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP14158039.9A EP2916433A1 (en) 2014-03-06 2014-03-06 Electric machine with rotor cooled by cooling gas
PCT/EP2015/053978 WO2015132116A2 (en) 2014-03-06 2015-02-26 Electric machine with a rotor cooled by cooling gas
EP15708775.0A EP3084924A2 (en) 2014-03-06 2015-02-26 Electric machine with a rotor cooled by cooling gas

Publications (1)

Publication Number Publication Date
EP3084924A2 true EP3084924A2 (en) 2016-10-26

Family

ID=50193374

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EP14158039.9A Withdrawn EP2916433A1 (en) 2014-03-06 2014-03-06 Electric machine with rotor cooled by cooling gas
EP15708775.0A Withdrawn EP3084924A2 (en) 2014-03-06 2015-02-26 Electric machine with a rotor cooled by cooling gas

Family Applications Before (1)

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US (1) US20170077770A1 (en)
EP (2) EP2916433A1 (en)
CN (1) CN106068597B (en)
RU (1) RU2650180C2 (en)
WO (1) WO2015132116A2 (en)

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Also Published As

Publication number Publication date
CN106068597A (en) 2016-11-02
WO2015132116A3 (en) 2015-12-10
EP2916433A1 (en) 2015-09-09
US20170077770A1 (en) 2017-03-16
CN106068597B (en) 2019-01-18
RU2650180C2 (en) 2018-04-11
WO2015132116A2 (en) 2015-09-11
RU2016131014A (en) 2018-04-06

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