WO2024027988A1 - Machine électrique - Google Patents

Machine électrique Download PDF

Info

Publication number
WO2024027988A1
WO2024027988A1 PCT/EP2023/067274 EP2023067274W WO2024027988A1 WO 2024027988 A1 WO2024027988 A1 WO 2024027988A1 EP 2023067274 W EP2023067274 W EP 2023067274W WO 2024027988 A1 WO2024027988 A1 WO 2024027988A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor shaft
shaped insert
electrical machine
cavity
rotor
Prior art date
Application number
PCT/EP2023/067274
Other languages
German (de)
English (en)
Inventor
Wael Mohamed
Tobias SCHLITTENBAUER
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2024027988A1 publication Critical patent/WO2024027988A1/fr

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
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • 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 invention relates to an electric machine with a rotor which is accommodated on a rotor shaft, which comprises a first rotor shaft part and a second rotor shaft part, which are joined together at a connection, a cavity being formed in the rotor shaft.
  • a shaped insert made of a plastic material is embedded in the cavity of the rotor shaft in a rotationally fixed manner, through which a cooling medium flows.
  • the invention further relates to the use of the electric machine in an e-axle module of an electrically driven vehicle.
  • DE 10 2020 207 000 Al is concerned with an arrangement for an electrical machine, comprising a rotor, an excitation device and an integrated energy transmission system.
  • the energy transmission system includes an exciter stator and an exciter rotor.
  • the exciter stator is preferably made of a plastic material, protrudes into the exciter rotor and can have a hole, designed as a longitudinal bore or channel, to the exciter stator from the inside, in particular with air, water and / or oil as a coolant to cool.
  • Such cooling can prevent overheating of the energy transmission device in the cavity of the machine rotor shaft and increase the efficiency.
  • DE 10 2021 105 084 A1 discloses oil cooling on an electric motor via direct spray cooling.
  • the system may include a shaft with an oil line extending axially therein and a plurality of openings for fluid coupling to the outside of the shaft, a rotor positioned coaxially with the shaft, and a gas-filled chamber between the inner surface of the rotor and the outer surface of the shaft.
  • oil can be provided on the oil line via an oil cooling system that is coupled to the electric motor via at least one rotor and at least one valve. This allows the temperature of an electric motor to be reduced during operation without adding a cooling jacket or fan and thus without increasing the weight or complexity of the motor.
  • a housing for an electrical machine comprising, among other things, an outer housing, an inner housing and a casing space with cooling fins to form a spiral-shaped cooling channel.
  • the cooling fins are designed as a separate plastic part and inserted into the gap. According to the disclosure, the cooling fins run in the axial direction and also extend into the floor space for cooling the bearing for the rotor shaft, where they continue to run radially.
  • the outer housing and the cooling fins formed thereon are preferably made inexpensively from aluminum or from plastic material, in particular polyamide or polypropylene.
  • the cooling medium reaches the interior of the electrical machine via a rotor shaft through the radially and axially extending bores and cools the winding heads there, among other things.
  • the flow of the cooling medium, especially oil, in the rotor shaft is highly dependent on the speed of the electrical machine, since the hole in the rotor shaft usually has a large diameter in order to get close to the rotor disk pack and cool better there. If the diameter of the rotor bore in the rotor shaft is small, the cooling medium does not get close enough to the disk pack, which significantly reduces the cooling performance. Disclosure of the invention
  • an electric machine is proposed with a rotor which is accommodated on a rotor shaft, which comprises a first rotor shaft part and a second rotor shaft part, which are joined together at a connection, a cavity being formed in the rotor shaft.
  • a shaped insert made of a plastic material is embedded in the cavity of the rotor shaft in a rotationally fixed manner, through which a cooling medium flows.
  • the solution proposed according to the invention provides a simple and inexpensive way to achieve a homogeneous distribution of the cooling medium within the electrical machine.
  • the insert made of plastic material is installed in particular in a rotationally fixed manner within the rotor shaft, which represents a much cheaper solution.
  • the insert has an inlet and an outlet through which the cooling medium flows through the insert, or the shaped insert has an inlet for the cooling medium, which exits the rotor shaft via radial bores and / or outlet nozzles exits into the electrical machine.
  • a connection between a first rotor shaft part and a second rotor shaft part of the rotor shaft is designed as a cohesive connection, in particular as a weld seam, or as a non-positive connection, in particular as a press fit. Due to the at least two-part design of the rotor shaft, the insert part can be easily inserted axially into one of the rotor shaft parts and mounted there before a complete rotor shaft is produced via the connection to the further, second rotor shaft part.
  • the cavity within the rotor shaft or one of the rotor shaft parts is delimited by an inner surface on which the shaped insert is in a double-walled design, in a meander shape or in a complementary shape with respect to the cavity Rotor shaft is in contact with the system.
  • the shaped insert is provided in a double-walled design with an outer wall and an inner wall, which delimit an annular space.
  • outlet openings in the outer wall of the shaped insert part in a double-walled design are aligned with radial bores in a shaft jacket of the rotor shaft.
  • the cooling medium for example oil, enters the interior of the electrical machine via the outlet openings.
  • the winding heads of the stator of the electrical machine are sprayed on so that waste heat generated there can be dissipated.
  • the shaped insert is designed in a spiral shape and comprises individual turns that are arranged at a distance from one another.
  • the individual turns of the shaped insert part having a spiral shape can contact the inner surface of the rotor shaft in order to enable heat conduction.
  • the shaped spiral-shaped insert is self-centering when installed in the cavity of the rotor shaft.
  • the shaped insert part is designed in a meander shape and comprises individual meander sections which extend in the axial direction within the cavity of the rotor shaft.
  • the individual meander sections achieve continuous contact, viewed in axial orientation, so that good heat dissipation or good heat transfer from the components accommodated on the rotor shaft in the form of the winding heads and the winding fins to the cooling medium can also be achieved in this embodiment variant.
  • the shaped insert part is designed in the form of a tube, with outlet nozzles extending radially from this in the direction of radial bores which are designed in the shaft jacket of the rotor shaft.
  • outlet nozzles extending radially from the shaped tubular insert part are aligned with the radial bores of the shaft shell of the rotor shaft.
  • the shaped insert can also be designed in a complementary shape to the inner contour of the cavity of the rotor shaft and also include outlet nozzles which are aligned with radial bores which are designed in the shaft casing of the rotor shaft.
  • a sealed system is created via a sealing ring which is provided within the first rotor shaft part.
  • the invention also relates to the use of the electric machine in an e-axle module of an electrically driven vehicle.
  • the solution proposed according to the invention allows a rotor shaft to be created in a manufacturing-technically advantageous and cost-effective manner, which can be manufactured as a standard component.
  • a conical bore in the interior of one of the rotor shaft parts can be avoided, which is particularly complex in terms of production technology and therefore has an extremely negative impact on the manufacturing costs.
  • a shaped insert can be used to even out the coolant distribution and thus to Evening out the temperature level within a rotor assembly of an electrical machine can be provided. Due to the outlined design variants of the shaped insert in a double-walled design in a spiral shape, in a meander shape, in a tubular shape or in a complementary shape with respect to the cavity of the rotor shaft, different installation requirements can be taken into account and different temperature distribution gradients can be achieved.
  • the fact that the shaped insert is made of a plastic material is advantageous with regard to the weight and with regard to the geometric shape of the shaped insert, since a wide variety of geometries can be realized.
  • FIG. 1 shows a longitudinal section through a one-piece rotor shaft of an electrical machine according to the prior art
  • Figure 2 shows a longitudinal section through an electrical machine proposed according to the invention with a shaped insert in a first embodiment variant
  • FIG. 3 shows a longitudinal section through an electrical machine proposed according to the invention with a shaped insert in a second embodiment variant
  • Figure 5 shows a fourth embodiment variant of the shaped insert part, embedded in a rotor shaft part of the electrical machine proposed according to the invention and
  • Figure 6 shows a fifth embodiment variant of the shaped insert part shaped complementary to the cavity of one of the rotor shaft parts of a multi-part rotor shaft.
  • FIG. 1 shows an electrical machine 10 which has a rotor 12 which rotates relative to a stator 14 which is accommodated in the housing of the electrical machine 10. While 12 disk packs 13 are accommodated on the rotor, the stator comprises 14 windings, each of which includes projecting winding heads 15 at their ends. A running toothing 16 is designed on a rotor shaft 18, which is designed here in one piece.
  • the rotor shaft 18 as shown in Figure 1 comprises a cavity 20, from which cooling medium distribution is possible through radial bores 22 provided in a shaft jacket 24.
  • Figure 2 shows a first embodiment variant of the shaped insert 30, which is embedded in a multi-part rotor shaft 18 of an electrical machine 10 according to the invention.
  • an insert 30 in a double-walled version 32 is embedded in the cavity 20 of a first rotor shaft part 42 in a rotationally fixed manner.
  • this includes an outer wall 34 and an inner wall 36.
  • the outer wall 34 and the inner wall 36 delimit an annular space 38 through which a cooling medium flows, for example oil, which flows laterally through a connector on the end face of the first rotor shaft part 42 enters the shaped insert part 30. Sealing is achieved by a sealing ring 76.
  • the outlet openings 40 are aligned in the shaped insert 30 in the double-walled version 32, which is mounted in a rotationally fixed manner in the cavity 20, with radial bores 22 which are located in the shaft jacket 24 of the rotor shaft 18.
  • the shaped insert 30, which is preferably made as a molded part from a plastic material, achieves targeted and effective cooling of the components in the form of winding parts accommodated on the circumference of the rotor shaft 18. Furthermore, effective cooling of the winding heads 15 of the stator 14 can be achieved by the solution proposed according to the invention.
  • the cooling medium in particular oil used for cooling, is preferably sprayed against the winding heads 15, which run laterally on the stator 14, in order to cool them, whereby the resulting waste heat is dissipated.
  • connection 46 can be produced either as a cohesive connection 48, in particular in the form of a weld seam, or as a non-positive connection 50, for example as a press fit.
  • the design options for the connection 46 as a cohesive connection 48 and a non-positive connection 50, as described above, relate to all embodiment variants of the shaped insert 30 according to Figures 3 to 6.
  • the shaped insert 30 in the embodiment variant according to FIG. 2 is arranged as close as possible to an inner surface 54 of the shaft jacket 24 of the first rotor shaft part 42.
  • Position 52 designates a rolling bearing in which the second rotor shaft part 44 of the rotor shaft 18, which is designed here in several parts, is rotatably received in the housing of the electrical machine 10.
  • a second embodiment variant of the shaped insert 30 proposed according to the invention is shown, embedded in the rotor shaft 18 of the electrical machine 10. From the illustration according to Figure 3 it can be seen that in this embodiment variant of the shaped insert 30, it takes on a spiral shape 60.
  • the spiral shape 60 of the shaped insert 30 according to the second embodiment comprises a number of individual turns 62 which can be arranged at a regular or irregular spacing 64 over the axial length of the shaped insert 30.
  • the individual turns 62 of the shaped insert part 30 according to the second embodiment variant according to FIG. 3 lie in contact 66 with the inner lateral surface 54, which delimits the cavity 20 of the first rotor shaft part 42 of the rotor shaft 18.
  • the cooling medium enters the first rotor shaft part 42 via an inlet 56 and leaves it at an elevated temperature at an outlet 58, which is also in a lateral, axially oriented connection of the first rotor shaft part 42 the rotor shaft 18 is arranged. Therefore, in the second embodiment variant according to FIG. 3, the shaped insert 30 is flowed through by the cooling medium.
  • FIG. 4 shows a further, third embodiment variant of the shaped insert part 30 proposed according to the invention, embedded in the first rotor shaft part 42 of the rotor shaft 18.
  • the shaped insert 30 essentially has a meander shape 68.
  • the meander shape 68 is characterized in that individual meander sections 69 extend essentially in axial orientation 70 in the cavity 20 of the first rotor shaft part 42 of the rotor shaft 18.
  • This provides the largest possible, evenly extending contact surface to the shaft jacket 24 of the first rotor shaft part 42 of the rotor shaft 18, which enables a significant improvement in heat transfer, starting from the components mounted on the circumference of the rotor shaft 18, to the cooling medium flowing through the shaped insert part 30.
  • a further, fourth embodiment variant of the shaped insert 30 emerges.
  • the shaped insert 30 can be seen, which essentially has a tubular shape 72.
  • the tubular body which passes through the first rotor shaft part 42 essentially symmetrically to its axis of rotation, individual outlet nozzles 74, oriented essentially in the radial direction, branch off and, for example, are connected to the radial bores 22, which are designed in the shaft jacket 24 of the first rotor shaft part 42, in connection. Therefore, in the fourth embodiment variant of the shaped insert 30 shown in Figure 5, the cooling medium exits into the electrical machine 10 via the outlet nozzles 74 or the radial bores 22 in the shaft jacket 24.
  • the electrical machine 10 is, for example, an ASM-E motor that can be cooled with oil.
  • such electrical machines 10 can also be cooled using other cooling media, for example water.
  • the cooling medium flows to it via the inlet 56.
  • a sealing ring 76 the shaped insert part 30 is sealed with respect to the first rotor shaft part 42 of the rotor shaft 18, which is designed in several parts in the embodiment variants of FIGS. 2 to 6.
  • the four outlet nozzles 74 shown here which branch off essentially radially from the tubular body of the shaped insert 30 in tubular shape 72, further outlet nozzles 74 can also be provided, which are aligned with radial bores 22 provided in the shaft jacket 24 of the first rotor shaft part 42.
  • the rotor shaft 18 is also designed to be split.
  • connection 46 can be designed either as a cohesive connection 48, for example as a weld seam, or as a non-positive connection 50, for example as a press fit.
  • the bearing of the rotor shaft 18, which is split here, is not shown in more detail, apart from the rolling bearing 52 indicated.
  • a fifth embodiment variant of the shaped insert 30 made of plastic material emerges.
  • this has a complementary shape 78.
  • this is to be understood as meaning that the shaped insert part 30 is designed to be complementary to the geometry of the cavity 20 in the first rotor shaft part 42.
  • the shaped insert 30 in its fifth embodiment variant according to Figure 6 is cylindrical and lies with its lateral surface in contact 66 with the inner lateral surface 54 of the first rotor shaft part 42 of the rotor shaft 18 of the electric machine 10.
  • the cooling medium also enters the shaped insert part 30 via the inlet 56 of the nozzle on the first rotor shaft part 42 and flows radially outwards from the inside.
  • the sealing ring 76 Via the sealing ring 76, the shaped insert part 30 in its fifth embodiment variant according to FIG. 6 is sealed against the first rotor shaft part 42 of the rotor shaft 18, which is designed here in two parts.
  • connection 46 is formed, for example, by a cohesive connection 48 in the form of a weld seam or as a non-positive connection 50 in the form of a press fit and sealed by means of the sealing ring 76.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne une machine électrique (10) comprenant un rotor (12) qui est reçu sur un arbre de rotor (18) qui comporte une première partie d'arbre de rotor (42) et une seconde partie d'arbre de rotor (44) qui sont reliées l'une à l'autre au niveau d'une liaison (46), une cavité (20) étant formée dans l'arbre de rotor (18). Un insert moulé (30), qui est fait d'une matière plastique et à travers lequel s'écoule un agent de refroidissement, est intégré dans la cavité (20) de l'arbre de rotor (18) pour une rotation conjointe avec celui-ci. L'invention concerne également l'utilisation de la machine électrique (10) dans un module d'essieu à entraînement électrique d'un véhicule électrique.
PCT/EP2023/067274 2022-08-03 2023-06-26 Machine électrique WO2024027988A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022208028.9A DE102022208028A1 (de) 2022-08-03 2022-08-03 Elektrische Maschine
DE102022208028.9 2022-08-03

Publications (1)

Publication Number Publication Date
WO2024027988A1 true WO2024027988A1 (fr) 2024-02-08

Family

ID=87060678

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/067274 WO2024027988A1 (fr) 2022-08-03 2023-06-26 Machine électrique

Country Status (2)

Country Link
DE (1) DE102022208028A1 (fr)
WO (1) WO2024027988A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009072A (en) * 1958-01-28 1961-11-14 Scott L & Electromotors Ltd Fluid cooled motors
EP2846439A1 (fr) * 2013-09-10 2015-03-11 Siemens Aktiengesellschaft Machine électrique dotée d'un arbre
US20150069861A1 (en) * 2011-07-07 2015-03-12 Siemens Aktiengesellschaft Electric machine with rotor interior ventilation
DE102015218620A1 (de) 2015-09-28 2017-03-30 Robert Bosch Gmbh Gehäuse für eine elektrische Maschine
DE102017112835A1 (de) * 2017-06-12 2018-12-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Elektrische Maschine, Kraftfahrzeug und Verfahren zur Herstellung einer elektrischen Maschine
DE102020207000A1 (de) 2019-06-19 2020-12-24 Universität Stuttgart, Körperschaft Des Öffentlichen Rechts Elektrisch erregte Maschine und Anordnung für eine elektrisch erregte Maschine
DE102020104663A1 (de) * 2020-02-21 2021-08-26 Bayerische Motoren Werke Aktiengesellschaft Elektrische antriebsmaschine zum antreiben eines kraftfahrzeugs
DE102021105084A1 (de) 2020-03-03 2021-09-09 Dana Belgium N.V. Systeme und verfahren zur bereitstellung einer direkten spritzkühlung in einem elektrischen motor
US20220060072A1 (en) * 2018-12-12 2022-02-24 Jheeco E-Drive Ag Rotor device for an electric machine and electric machine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009072A (en) * 1958-01-28 1961-11-14 Scott L & Electromotors Ltd Fluid cooled motors
US20150069861A1 (en) * 2011-07-07 2015-03-12 Siemens Aktiengesellschaft Electric machine with rotor interior ventilation
EP2846439A1 (fr) * 2013-09-10 2015-03-11 Siemens Aktiengesellschaft Machine électrique dotée d'un arbre
DE102015218620A1 (de) 2015-09-28 2017-03-30 Robert Bosch Gmbh Gehäuse für eine elektrische Maschine
DE102017112835A1 (de) * 2017-06-12 2018-12-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Elektrische Maschine, Kraftfahrzeug und Verfahren zur Herstellung einer elektrischen Maschine
US20220060072A1 (en) * 2018-12-12 2022-02-24 Jheeco E-Drive Ag Rotor device for an electric machine and electric machine
DE102020207000A1 (de) 2019-06-19 2020-12-24 Universität Stuttgart, Körperschaft Des Öffentlichen Rechts Elektrisch erregte Maschine und Anordnung für eine elektrisch erregte Maschine
DE102020104663A1 (de) * 2020-02-21 2021-08-26 Bayerische Motoren Werke Aktiengesellschaft Elektrische antriebsmaschine zum antreiben eines kraftfahrzeugs
DE102021105084A1 (de) 2020-03-03 2021-09-09 Dana Belgium N.V. Systeme und verfahren zur bereitstellung einer direkten spritzkühlung in einem elektrischen motor

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Publication number Publication date
DE102022208028A1 (de) 2024-02-08

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