WO2023061663A1 - Rotor und elektrische maschine mit integrierter wickelkopfkühlung, fertigungsverfahren und kraftfahrzeug - Google Patents
Rotor und elektrische maschine mit integrierter wickelkopfkühlung, fertigungsverfahren und kraftfahrzeug Download PDFInfo
- Publication number
- WO2023061663A1 WO2023061663A1 PCT/EP2022/074695 EP2022074695W WO2023061663A1 WO 2023061663 A1 WO2023061663 A1 WO 2023061663A1 EP 2022074695 W EP2022074695 W EP 2022074695W WO 2023061663 A1 WO2023061663 A1 WO 2023061663A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- support structure
- laminated core
- coolant
- return
- 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.)
- Ceased
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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating 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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/021—Magnetic cores
- H02K15/022—Magnetic cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/06—Embedding prefabricated windings in the machines
- H02K15/062—Windings in slots; Salient pole windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/18—Windings for salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/527—Fastening salient pole windings or connections thereto applicable to rotors only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Definitions
- the present invention relates to a rotor and an electrical machine equipped therewith with integrated cooling and a method for manufacturing such a rotor.
- the invention further relates to a motor vehicle equipped with a corresponding electrical machine.
- a rotor for an electrical machine is described with a rotor shaft, a carrier coupled in a torque-proof manner thereto and a squirrel-cage cage arranged on the carrier or a winding arranged on the carrier.
- the rotor shaft includes a cavity for guiding a coolant through the rotor shaft, with a radial shaft outer wall of the rotor shaft having at least one opening through which the cooling fluid can exit from the cavity.
- the breakthrough ends in a Channel system comprising an annular channel and a carrier channel fluidly coupled thereto and extending axially within the carrier.
- the annular channel extends outside of the carrier in a ring shape around the rotor shaft and is formed by a guide means arranged outside on the outer wall of the shaft together with the outer shaft wall and/or the carrier.
- the guide means has an ejection opening which penetrates the guide means radially and through which the coolant can exit from the channel system into the area surrounding the rotor.
- the electrical machine described there has a housing and a tube, the tube being in a channel.
- a first cooling medium can flow around the tube and a second cooling medium can flow through it.
- the object of the present invention is to specify a particularly simple implementation option for effective and efficient cooling of a rotor for an electrical machine.
- the rotor according to the invention is provided, ie designed for an electrical machine, in particular a current-excited synchronous machine (SSM).
- the rotor according to the invention has a laminated core, ie a stack of a large number of electrical laminations stacked in the axial direction, and a rotor shaft which is surrounded at least in sections.
- the rotor shaft has a coolant guide for a coolant or cooling medium for cooling or cooling the rotor during normal operation of the corresponding electrical machine.
- the rotor shaft is set up to guide or transport a coolant, for example in a cooling circuit of the rotor or the electrical machine or to and from an external cooling circuit.
- the rotor according to the invention has a rotor winding which is connected to one another in the axial direction opposite end faces of the laminated core each forms at least one end winding.
- the axial direction here corresponds to a stacking direction of the electrical laminations and a direction of a central axis of rotation or axis of rotation of the rotor about which the rotor rotates or can rotate during normal operation in the electrical machine.
- the end faces of the laminated core are those sides or surfaces which are on the outside or on the outside in the axial direction and are perpendicular to the axial direction, that is to say in a respective cross-sectional plane of the rotor.
- the rotor according to the invention also has a first end winding support structure, which is arranged on a first end face—also referred to as the A side—of the laminated core, and a second end end support structure, which is arranged on the opposite end face—also referred to as the B side of the laminated core is arranged.
- At least one cavity structure through which the coolant can flow is formed in the first end winding support structure and at least one recess through which the coolant can flow is formed in or on the second end winding support structure.
- the at least one cavity structure of the first end winding support structure each has an inflow area and in each case a return area that is separate from the inflow area.
- the inlet area has an inlet opening, into which the coolant guide of the rotor shaft opens directly or indirectly, and an outlet opening for the coolant.
- the return area has its own inlet opening and its own outlet opening for the coolant. The coolant can thus enter or flow into the cavity structure through the inlet opening of the inlet area, while it can exit or flow out of the cavity structure or the rotor through the outlet opening of the return area.
- At least one feed line for the coolant leads from the outflow opening of the inflow area of the cavity structure to the opposite second end winding support structure.
- at least one return line for the coolant leads from the second Wi eke I head support structure to the inlet opening of the return area cavity structure. The coolant can therefore flow through the rotor in the axial direction with opposite flow directions through the forward and return lines.
- the respective outgoing line opens into the cutout formed in or on the second end winding support structure and the respective return line starts from this cutout.
- the recess is elongated in the circumferential direction.
- the recess can thus extend primarily or mainly in the circumferential direction at least partially around the rotor shaft.
- the recess can thus have an annular shape or a ring segment shape.
- the coolant can flow through the cutout for cooling or heat dissipation of the second end winding support structure in the circumferential direction from the mouth of the respective outgoing line to a base or beginning of the respective return line during normal operation of the rotor or the corresponding electrical machine.
- the forward and return lines can be arranged at least substantially parallel to one another and offset from one another in the circumferential direction or spaced apart from one another.
- the outward and return lines in the circumferential direction can at least essentially be spaced apart from one another or offset from one another in the circumferential direction by a length, size or extent of the respective recess, for example except for manufacturing tolerances or constraints.
- the mouth of the forward line and the attachment of the return line can therefore be arranged on the outer or mutually opposite ends or edge regions of the respective recess, viewed in the circumferential direction. This enables maximum flow through the recess and can avoid or reduce the formation of areas in the recess with at least almost zero flow rate of the coolant during normal operation.
- the present invention is based on the finding that in a rotor for an SSM, the rotor winding and in particular its end windings represent a significant heat source during operation and, thanks to more effective cooling than conventional solutions, robustness or high performance, in particular permanent or continuous operation the corresponding electrical machine achievable continuous torque or a corresponding continuous power can be improved.
- This is achieved in the present invention in that as a heat sink Acting coolant flow through the described arrangement and design of the rotor, the end winding support structures and can thus be brought or guided particularly close to the rotor winding and its end windings.
- the present invention thus makes it possible to dissipate more heat from the rotor at the same or given temperature of the rotor winding than is usually the case with conventional SSM rotors.
- cooling via the laminated core into the rotor shaft and then liquid cooling of the rotor shaft can be provided.
- the heat does not have to be conducted through the entire laminated core, but can already reach the cavity structure, the recess and/or the supply and/or return lines, where it is absorbed by the coolant guided or flowing therein during normal operation and can be removed from the rotor particularly quickly, effectively and efficiently by this.
- the corresponding liquid cooling of the rotor according to the invention is fed via the rotor shaft, which is also liquid-cooled by the coolant during normal operation.
- the coolant can also flow back or flow out of the rotor through or via the rotor shaft or in some other way, for example by the coolant escaping or being thrown out of the rotor, in particular out of the first end winding support structure.
- the inlet and return areas of the first end winding support structure and the cutout of the second end winding support structure can each have a larger diameter than the coolant guide of the rotor shaft and/or than the forward and return lines. Viewed in a respective cross-sectional plane of the rotor perpendicular to the axial direction, the inflow and return areas as well as the recess can each have or occupy a larger area than the coolant guide and/or than the corresponding forward and return lines. In this way, a particularly large surface of the cavity structure and the cutout can be realized.
- the coolant guide of the rotor shaft can in particular comprise at least one radial bore which at least partially extends through a wall of the rotor shaft in the radial direction.
- the supply of coolant through the rotor shaft can be a particularly simple and space-saving option for supplying coolant to the rotor according to the invention, which can be implemented without impairing the electrical properties or the performance or power density of the corresponding electrical machine, since the rotor shaft is in a center of rotation, i.e. radially central or in the middle located in the rotor.
- the rotor according to the invention can have several of the cavity structures described.
- the cavity structure can comprise a plurality of pairs each consisting of an inflow area and a return area.
- the rotor according to the invention can also have a plurality of recesses in or on the second end winding support structure. It is then also possible to provide several pairs, each consisting of a forward line and a corresponding return line. At least one feed line can run from each inlet area to the corresponding recess and at least one return line can run from the respective recess to the corresponding return area.
- Corresponding numbers can, for example, be defined or predetermined as a function of an available installation space, a cooling capacity required in a particular application and/or the like.
- the forward and return lines run through a rotor yoke of the rotor.
- Rotor teeth or pole shafts can extend radially away from the rotor yoke.
- the rotor yoke can form a region of the rotor facing the rotor shaft.
- the forward and return lines are therefore arranged or formed in the region of the rotor yoke, for example in receptacles or bores there, and completely penetrate the rotor yoke in the axial direction.
- At least the forward line or lines or also the return line or return lines can be arranged closer to the rotor winding in the radial direction than on a side of the rotor yoke facing away from it in the radial direction.
- the proposed embodiment of the present invention a particularly effective heat dissipation of the rotor in particular can be achieved in a space-saving manner and without or with a particularly low influencing of the electrical properties of the rotor or the corresponding electrical machine, for example in comparison to an arrangement of the forward and return lines below or outside the rotor yoke or the laminated core or within the laminated core.
- the outward and return lines for the coolant form the only inlets and outlets of the recess formed in or on the second end winding support structure.
- this or the respective recess is connected fluidically only via the respective at least one forward line and the respective at least one return line, that is, for example, integrated into a cooling circuit for the coolant.
- the rotor can be constructed in a particularly simple and compact manner, ie in a space-saving manner.
- the number of fluid-carrying connections that may need to be sealed can be reduced or limited in this way, which can also enable a particularly simple configuration and particularly reliable operation of the rotor or the corresponding electrical machine.
- the first end winding support structure is constructed in several parts.
- the first end winding support structure comprises an inner part that lies flat against the corresponding end face of the laminated core and an outer part that lies flat against the inner part on an outer end face of the inner part that faces away from the laminated core.
- the cavity structure is delimited both by the inner part and by the outer part. In other words, the cavity structure is formed or arranged between the inner part and the outer part. The inner part and/or the outer part or parts of the cavity structure formed therein are therefore open towards the respective other part.
- the inner part and/or the outer part can have corresponding indentations, which form the cavity structure, and/or function as a possibly flat cover for covering or closing the indentations, ie the cavity structure.
- the inner part and the outer part can each have a plate-like or disk-like basic shape, i.e. have a greater extent in particular in the radial direction, i.e. in a cross-sectional plane perpendicular to the axial direction, than in axial direction.
- the embodiment of the present invention proposed here enables the cavity structure to be manufactured particularly easily, since corresponding depressions or cavities can be open on one side in the axial direction, so that enclosed internal cavities do not have to be manufactured.
- the cavity structure can be achieved in this way, which, for example, can facilitate maintenance or repair of the rotor, such as cleaning of the cavity structure.
- the rotor can be particularly easy to manufacture and particularly robust in operation due to the respective planar contact of the parts of the first end winding support structure on one another or on the laminated core.
- the inner part and the outer part can be connected to one another by fastening means, for example screwed, glued, plugged, latched and/or welded to one another.
- the inner part can be attached to the laminated core, for example.
- At least one seal in particular at least one flat seal, can be arranged in the axial direction between the inner part and the outer part. This seal can therefore rest on the sides of the inner and outer part facing one another and, viewed in a cross-sectional plane of the rotor, surround the cavity structure in order to seal it.
- the feed and return areas can each be surrounded or sealed off by their own, ie individual, seal. Reliable operation of the rotor or of the electrical machine can thus be ensured in a simple manner.
- the at least one recess formed in or on the second end winding support structure is delimited axially on the inside, i.e. on a side or end face facing the laminated core, by at least one sealing body lying against the corresponding end face of the laminated core.
- This sealing body can in particular be attached to the laminated core, for example screwed, glued, welded and/or connected to it by means of a latching or plug-in connection.
- the recess is delimited or bordered and/or formed by the second winding head support structure or at least a part of the second winding head support structure.
- the sealing body can therefore be a component that is different from the second end winding support structure.
- the sealing body can then be a part of the second end winding support structure.
- the part of the second end winding support structure that delimits the recess axially on the outside can then be designed or referred to as its main part, for example.
- the second end winding support structure or the corresponding part thereof that delimits the at least one recess axially outwards can have an annular depression or a depression in the form of a segment of a ring.
- the sealing body can have one or more projections or elevations. These can rise in the axial direction, in particular by an axial depth of the recess, above a surrounding surface area or face area of the sealing body and be spaced apart from one another in the circumferential direction.
- the raised or raised projections or elevations of the sealing body can then engage or protrude into the depression of the second end winding support structure and form barriers in some areas, through which the plurality of recesses are or will be formed or spaced apart from one another in the circumferential direction.
- the second end winding support structure or its axially outer part and ultimately also the at least one recess can be manufactured in a particularly simple manner.
- the sealing body or its axially outer end face, ie facing away from the laminated core can be designed flat or at least essentially planar and function as a cover or cover of the at least one depression.
- a corresponding plurality of depressions spaced apart from one another in the circumferential direction can then be formed in the second winding head support structure or in the corresponding part of the second winding head support structure.
- the at least one recess can be sealed off in a fluid-tight manner by at least one seal, in particular against fluid escaping in the radial direction from or on the second end winding support structure.
- the rotor has a plurality of rotor poles, in particular distributed uniformly in the circumferential direction.
- each rotor pole may have or be formed by a corresponding pole leg.
- the first end winding support structure has at least or exactly one feed area and at least or exactly one return area.
- the second end winding support structure has at least one cutout for each pair of rotor poles.
- the recesses extend in the circumferential direction at least or at least essentially over the entire extent of a pole shaft of at least one of the rotor poles.
- the respective recess can extend at least up to a diameter of the associated outgoing and return lines over the width or extent of the pole shaft in the circumferential direction or, for example, at least by the diameter of the outgoing and return lines.
- the outward and return lines that are fluidically directly connected to the same recess can be spaced further apart from one another in the circumferential direction than the extension or width of the respective pole shaft and the respective recess can thus extend correspondingly far in the circumferential direction.
- exactly or at least three forward lines and correspondingly exactly or at least three return lines can be provided for six rotor poles of the rotor, which are arranged alternately and evenly or regularly distributed in the circumferential direction.
- forward and return lines for example at least one forward line and one return line per rotor pole
- One pair each from an inlet and outlet area of the cavity structure of the first end winding support structure can extend in the circumferential direction over at least essentially the area occupied by the associated recess, i.e. fluidly connected to it by the corresponding out and return lines.
- the embodiment of the present invention proposed here can achieve particularly effective cooling or heat dissipation of the rotor, since the heat generated during operation in the respective rotor winding wound around the pole shaft can be dissipated at any point along a particularly short path into the coolant.
- the drain opening or a further drain of the at least one return region of the cavity structure of the first end winding support structure is open radially outwards. So it can a correspondingly radially running section, a radial bore or the like can be provided so that when the rotor rotates about the axial direction, i.e.
- the coolant after it has flowed out of the return line into the Is flowed return area, due to rotation or centrifugal force exits through the radially outwardly open drain opening or the radially outwardly open additional flow from the first end winding support structure or is thrown out or can be. In this way, the coolant can in particular also emerge or be thrown out of the rotor as a whole.
- the coolant after the coolant has been fed into the rotor via the rotor shaft or along the rotor shaft and has flowed through the first end winding support structure, the at least one forward line, the second end winding support structure and the at least one return line back to the first end winding support structure, it can be used to cool further components of the electrical machine, for example a stator or the like surrounding the rotor in the intended installation position.
- this enables a particularly simple construction of the rotor or the coolant guide, since, for example, a corresponding return of the coolant through the rotor shaft as well as a seal at the drain opening or the further drain of the return area can be saved.
- a further aspect of the present invention is a method for manufacturing a rotor according to the invention.
- a large number of electrical laminations are arranged to form the laminated core, that is to say stacked.
- the forward and return lines are introduced into corresponding axial receptacles, in particular bores or stampings, in the laminated core or the electrical laminations.
- the forward and return lines can be inserted or pushed into these receptacles, particularly in the axial direction.
- electrical slot insulation can also be arranged or attached to the laminated core.
- first end winding support structure and the second end winding support structure are arranged or attached to the end faces of the laminated core.
- These components can also be fastened here, for example to one another and/or to the laminated core.
- the end winding support structures can first be completely preassembled separately from the laminated core.
- first end winding support structure can be connected to one another and/or the sealing body can be attached to the second winding head support structure or its main part.
- the first and/or second end winding support structure preassembled in this way can then be fastened or mounted on the laminated core as a multi-part component, for example plugged onto this or a corresponding receptacle or holder or the like, in particular in the axial direction.
- This can enable a particularly simple, efficient and cost-effective manufacture or final assembly of the rotor and/or simplify logistics for the manufacture of the rotor.
- support structure insulation for electrically insulating the end winding support structures can also be attached here, for example, or preassembled as parts of the end winding support structures.
- the laminated core is wound with the at least one rotor winding.
- the rotor shaft is joined in a central shaft receiving space of the laminated core.
- cover slides for covering the rotor winding or slots of the laminated core or also for holding the rotor winding, support rings, front end caps, covers and/or housing parts and/or the like can be added, remaining Free spaces or cavities within the rotor are filled with an electrically insulating potting compound and/or the like.
- the rotor manufactured in this way can then be arranged or mounted in a corresponding stator. Further sequences or measures mentioned in connection with the other aspects of the present invention can form further, possibly optional, method steps of the method according to the invention.
- a further aspect of the present invention is an electrical machine, in particular an SSM, which has a stator and the rotor arranged at a distance therefrom by an air gap and mounted rotatably about the central axis of rotation relative to the stator according to the invention or manufactured according to the method according to the invention.
- the electrical machine according to the invention can in particular be or correspond to the electrical machine mentioned in connection with the other aspects of the present invention. Accordingly, the electrical machine according to the invention can have some or all of the properties and/or features mentioned in these contexts.
- a further aspect of the present invention is a motor vehicle which has the or an electric machine according to the invention, in particular as a traction machine.
- the motor vehicle according to the invention represents a particularly favorable application for the electric machine according to the invention, since dynamically very different load requirements or loads on the electric machine, in particular short-term or permanent peak loads, can occur during operation of the motor vehicle, and the improved cooling according to the invention thus directly affects the corresponding operation of the Motor vehicle can support.
- weight can be saved in comparison to other solutions, which can have a direct positive effect on response or driving behavior and range of the motor vehicle.
- FIG. 1 shows a fragmentary, schematic, longitudinally sectioned perspective illustration of a rotor
- FIG. 2 shows a sectional schematic first perspective view of several parts of a first end winding support structure of the rotor
- FIG. 3 shows a sectional schematic second perspective view of the several parts of the first end winding support structure
- FIG. 4 shows a fragmentary schematic perspective illustration of a second rotor bearing structure and a corresponding sealing body
- FIG. 5 shows a fragmentary, schematic, longitudinally sectioned perspective illustration of the rotor in an intermediate production state
- FIG. 6 shows a sectional, schematic, partially transparent perspective view of the rotor to illustrate coolant routing on the side of the first end winding support structure
- FIG. 7 shows a sectional, schematic, partially transparent perspective view of the rotor to illustrate coolant routing on the side of the second end winding support structure.
- FIG. 1 shows a fragmentary, schematic, longitudinally sectioned perspective illustration of an electrical machine 1 , in particular a rotor 2 .
- the rotor 2 has a plurality of rotor poles 3 . These are formed by a correspondingly shaped laminated core 4 and a rotor winding 5 wound around it. A winding wire of the rotor winding 5 is covered here by a winding insulation and is therefore not recognizable in detail.
- the laminated core 4 surrounds a rotor shaft 6 which extends centrally through the laminated core 4 in the axial direction.
- the rotor shaft 6 can be part of the rotor 2 or of the electrical machine 1 .
- the rotor winding 5 forms end windings which are held or supported by a respective end winding support structure.
- a first end winding support structure 7 arranged on one of the end faces is designed here in multiple parts and comprises an inner part 8, which bears against the corresponding end face of the laminated core 4, and an outer part 9 arranged axially on the outside thereof partially covered.
- an outer cover 11 and a slot sealing wedge 12 of the rotor 2 are shown here in regions or sections. Free spaces remaining between the named components can be filled with a potting material 43 or have expired, which is also only partially or partially shown here to improve visibility.
- the rotor 2 is set up for liquid cooling.
- a cavity structure is formed in the first end winding support structure 7 .
- a coolant, in particular a liquid coolant, can flow into the cavity structure via this inlet opening 14 .
- the liquid cooling of the rotor 2 is fed via the rotor shaft 6 . Coolant guided in the rotor shaft 6 can flow through this radial bore 15 through a subsequent coolant guide 16 into the inlet area 13 .
- the inlet area 13 has an outlet opening 17 to which a feed line 18 is connected.
- the feed line 18 extends in the axial direction through the laminated core 4, in particular through a rotor yoke of the laminated core 4, to a second end winding support structure 19 arranged on the other end face of the laminated core 4.
- the second end winding support structure 19 here comprises a main part 20 .
- a sealing body 21 is arranged axially on the inside of this on the corresponding end face of the laminated core 4 .
- the main part 20 and the sealing body 21 together form or delimit at least one recess 22.
- One end of the respective feed line 18 opens into this recess 22. The coolant can therefore flow in the axial direction through the feed line 18 flow into the recess 22 and then flow through the recess 22 in the circumferential direction.
- a plurality of such recesses 22 can be formed here in the circumferential direction, for example recess 22 for each pair of rotor poles 3. At least or exactly one associated outgoing line 18 can open into each of these recesses 22. In addition, at least one associated return line 23 extends from each of these recesses 22 . Such a return line 23 for a recess 22 other than the feed line 18 can be seen from the sectional representation of the rotor 2 chosen here.
- the return line 23 passes through the laminated core 4 in the axial direction, in particular also its rotor yoke, up to the first end winding support structure 7. There, the return line 23 opens into a respective return area 24 of the cavity structure of the first end winding support structure 7. For this purpose, the return area 24 has a corresponding inlet 25 .
- the coolant can then drain or flow out of the return area 24 through a drain 26 .
- the coolant can be routed to a coolant recirculation system and, for example, in turn, be routed back to the radial bore 15 through the rotor shaft 6 and optionally other areas, stations or components, such as an external cooling circuit or the like.
- the coolant can flow through the outlet 26 to a spray opening 27 .
- This injection opening 27 is formed here, for example, in the outer part 9 of the first end winding support structure 7 and is open radially outwards.
- the coolant can thus be sprayed out or emerge from the spray opening 27 during operation of the electric machine 1, ie when the rotor 2 rotates, and then, for example, wet other parts or components of the electric machine 1 for cooling.
- FIG. 2 shows a fragmentary, schematic, partially exploded perspective view of the first end winding support structure 7.
- its inner part 8 and its outer part 9 are shown spaced apart from one another in the axial direction.
- the inlet area 13 and the corresponding return area 24 separate therefrom i.e. spaced apart or separated in the circumferential direction, can be seen as recesses or depressions in the inner part 8.
- Cavity seals 29 arranged between the inner part 8 and the outer part 9 can be seen here through the partially exploded representation. Each of these cavity seals 29 surrounds a region of the cavity structure of the first end winding support structure 7 . A respective individual cavity seal 29 is arranged around the inlet regions 13 and around the return regions 24 .
- the inner part 8 has corresponding fastening holes 30 for fastening the outer part 9 to the inner part 8 and/or to the laminated core 4 .
- This can be, for example, plug or screw holes or the like.
- a respective fastening element 31 can engage in the fastening holes 30 in the axial direction, ie can be screwed in step by step in the form of a screw.
- the fastening holes 30 can be arranged, for example, in each case between an inlet area 13 and an adjacent return area 24 in the circumferential direction.
- the outer part 9 can also have corresponding holes, recesses or openings.
- a second return area 24 can be partially seen here, which illustrates that the cavity structure here comprises a plurality of inflow areas 13 and return areas 24 distributed in the circumferential direction, in particular uniformly or regularly, around a central rotor shaft passage 28 .
- the cavity structure here comprises a plurality of inflow areas 13 and return areas 24 distributed in the circumferential direction, in particular uniformly or regularly, around a central rotor shaft passage 28 .
- FIG. 3 shows a schematic, partially exploded perspective view of the first end winding support structure 7.
- a different viewing direction or perspective is shown here, in which an end face of the outer part 9 facing the inner part 8 is partially visible.
- depressions are also formed in the outer part 9 as parts of the inlet areas 13 and the return areas 24, which are open toward the inner part 8 in the axial direction.
- the corresponding depressions are, in particular both on the side of the inner part 8 and on the side of the outer part 9, surrounded by a respective seal receptacle 32 for receiving the cavity seal 29 . This can allow the mutually facing sides or end faces of the inner part 8 and the outer part 9 to lie flat against one another.
- FIG. 4 shows a partial, schematic, partially exploded perspective view.
- the second end winding support structure 19 or its main part 20 and the sealing body 21 spaced from it are shown here.
- the main part 20 has an annular depression which annularly surrounds a rotor shaft bushing 28 of the second end winding support structure 19 .
- the recesses 22 are covered or delimited axially on the inside by a respective area of a recess inner side 33 which is formed by a corresponding area of an outer end face of the sealing body 21 .
- Radial penetrations are formed in the recess inner side 33 and act as a feed line opening 34 for the respective feed line 18 or as a return line attachment 35 for the respective return line 23 .
- the sealing body 21 has an elevation 36 in each case, which is raised above the inner side 33 of the recess in the axial direction outwards, ie in the direction of the main part 20 .
- the elevations 36 can in each case completely pass through or fill out the annular depression formed in the main part 20 in the axial direction.
- raising end faces 37 of the elevations 36 facing the main part 20 can rest against an inner end face of the annular depression.
- the annular recess is divided into the plurality of recesses 22 in the circumferential direction.
- Ring seals 38 are provided here to seal the recess or the recesses 22 and are arranged on the radial inner and outer sides of the annular recess.
- the sealing body 21 has a respective annular sealing groove 39 radially on the inside and radially on the outside, in which the respective ring seal 38 engages in the intended installation position.
- FIG. 5 shows a fragmentary, schematic, longitudinally sectioned perspective illustration of the rotor 2 in an intermediate production state.
- the rotor 2 is designed as a salient-pole rotor.
- the rotor 2 has, for example, a pole shaft 40 for each rotor pole 3 with a pole shoe 41 adjoining it radially on the outside.
- intermediate Rotor slots are each lined with a slot insulation 42 lying against the laminated core 4 for electrically insulating the laminated core 4 from the rotor winding 5 .
- each of the recesses 22 has a feed line opening 34 for the respective feed line 18 and a return line attachment 35 for the respective return line 23 .
- the respective supply line mouth 34 and the respective return line attachment 35 are arranged in the circumferential direction on edge regions of the respective recess 22 .
- the recesses 22 each extend in the circumferential direction at least over the entire extent of a pole shaft 40 or a rotor pole 3.
- a forward line 18 or a return line 23 can be arranged centrally between two adjacent rotor poles 3 or pole shafts 40 .
- a recess 22 and an elevation 36 can then be arranged alternately in the area of the pole shafts 40 .
- a recess 22 is arranged in the circumferential direction on or in the radial direction inside of or under every second pole shaft 40 and an elevation 36 on or radially inside or under the remaining pole shafts 40 .
- Fig. 6 shows a fragmentary, schematic, partially transparent perspective view of the rotor 2 to further illustrate how the coolant is routed, in particular on the side of the first end winding support structure 7. It can be seen here that the coolant flows from the rotor shaft 6 through the coolant route 16 into the respective inlet area 13 and can flow in the opposite flow direction through the return line 23 into the respective return area 24 .
- Fig. 7 shows a fragmentary, schematic, partially transparent perspective view of the rotor 2 to further illustrate how the coolant is routed on the side of the second rotor head support structure 19.
- the recesses 22 are each bent in the form of a circular ring section in the circumferential direction in the area in each case a rotor pole 3 or a pole shaft 40 extend.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/682,247 US20240356401A1 (en) | 2021-10-14 | 2022-09-06 | Rotor and Electric Machine With Integrated Winding Head Cooling, Manufacturing Method and Motor Vehicle |
| CN202280053672.1A CN117795827A (zh) | 2021-10-14 | 2022-09-06 | 具有集成的绕组头冷却装置的转子和电机、制造方法和机动车 |
| EP22773500.8A EP4416827A1 (de) | 2021-10-14 | 2022-09-06 | Rotor und elektrische maschine mit integrierter wickelkopfkühlung, fertigungsverfahren und kraftfahrzeug |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021126696.3 | 2021-10-14 | ||
| DE102021126696.3A DE102021126696A1 (de) | 2021-10-14 | 2021-10-14 | Rotor und elektrische Maschine mit integrierter Wickelkopfkühlung, Fertigungsverfahren und Kraftfahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023061663A1 true WO2023061663A1 (de) | 2023-04-20 |
Family
ID=83398373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2022/074695 Ceased WO2023061663A1 (de) | 2021-10-14 | 2022-09-06 | Rotor und elektrische maschine mit integrierter wickelkopfkühlung, fertigungsverfahren und kraftfahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240356401A1 (de) |
| EP (1) | EP4416827A1 (de) |
| CN (1) | CN117795827A (de) |
| DE (1) | DE102021126696A1 (de) |
| WO (1) | WO2023061663A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023123916A1 (de) * | 2023-09-06 | 2025-03-06 | Bayerische Motoren Werke Aktiengesellschaft | Rotor für eine elektrische Maschine eines Kraftfahrzeugs sowie elektrische Maschine für ein Kraftfahrzeug |
| DE102023123915A1 (de) * | 2023-09-06 | 2025-03-06 | Bayerische Motoren Werke Aktiengesellschaft | Rotor für eine elektrische Maschine eines Kraftfahrzeugs sowie elektrische Maschine für ein Kraftfahrzeug |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160204663A1 (en) * | 2013-09-06 | 2016-07-14 | Ge Aviation Systems Llc | Rotor assembly for an electric machine |
| DE102015211048A1 (de) | 2015-06-16 | 2016-12-22 | Siemens Aktiengesellschaft | Elektrische Maschine |
| EP3633825A1 (de) * | 2018-10-04 | 2020-04-08 | Hamilton Sundstrand Corporation | Kühlung eines eingebetteten flüssigkeitsgekühlten rotors |
| DE102020104149A1 (de) | 2020-02-18 | 2021-08-19 | Audi Aktiengesellschaft | Rotor für eine elektrische Maschine, elektrische Maschine und Kraftfahrzeug |
| DE102021102430A1 (de) * | 2021-02-03 | 2022-08-04 | Bayerische Motoren Werke Aktiengesellschaft | Rotor für eine elektrische Maschine eines Antriebsstrangs sowie elektrische Maschine für ein Fahrzeug |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6661133B2 (en) | 2001-07-12 | 2003-12-09 | Eli Liebermann | Rotor cooling arrangement |
| FR2984034B1 (fr) | 2011-12-08 | 2014-08-22 | Renault Sa | Dispositif de guidage d'un ensemble de fils electriques pour rotor de moteur electrique |
| JP5917195B2 (ja) | 2012-02-29 | 2016-05-11 | 川崎重工業株式会社 | 超電導回転機の界磁回転子 |
-
2021
- 2021-10-14 DE DE102021126696.3A patent/DE102021126696A1/de active Pending
-
2022
- 2022-09-06 CN CN202280053672.1A patent/CN117795827A/zh active Pending
- 2022-09-06 US US18/682,247 patent/US20240356401A1/en active Pending
- 2022-09-06 WO PCT/EP2022/074695 patent/WO2023061663A1/de not_active Ceased
- 2022-09-06 EP EP22773500.8A patent/EP4416827A1/de active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160204663A1 (en) * | 2013-09-06 | 2016-07-14 | Ge Aviation Systems Llc | Rotor assembly for an electric machine |
| DE102015211048A1 (de) | 2015-06-16 | 2016-12-22 | Siemens Aktiengesellschaft | Elektrische Maschine |
| EP3633825A1 (de) * | 2018-10-04 | 2020-04-08 | Hamilton Sundstrand Corporation | Kühlung eines eingebetteten flüssigkeitsgekühlten rotors |
| DE102020104149A1 (de) | 2020-02-18 | 2021-08-19 | Audi Aktiengesellschaft | Rotor für eine elektrische Maschine, elektrische Maschine und Kraftfahrzeug |
| DE102021102430A1 (de) * | 2021-02-03 | 2022-08-04 | Bayerische Motoren Werke Aktiengesellschaft | Rotor für eine elektrische Maschine eines Antriebsstrangs sowie elektrische Maschine für ein Fahrzeug |
Also Published As
| Publication number | Publication date |
|---|---|
| US20240356401A1 (en) | 2024-10-24 |
| EP4416827A1 (de) | 2024-08-21 |
| CN117795827A (zh) | 2024-03-29 |
| DE102021126696A1 (de) | 2023-04-20 |
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