WO2023285213A1 - Rotor pour une machine électrique - Google Patents

Rotor pour une machine électrique Download PDF

Info

Publication number
WO2023285213A1
WO2023285213A1 PCT/EP2022/068629 EP2022068629W WO2023285213A1 WO 2023285213 A1 WO2023285213 A1 WO 2023285213A1 EP 2022068629 W EP2022068629 W EP 2022068629W WO 2023285213 A1 WO2023285213 A1 WO 2023285213A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
fiber
reinforced plastic
plastic matrix
bearing
Prior art date
Application number
PCT/EP2022/068629
Other languages
German (de)
English (en)
Inventor
Stephan Gaertner
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 WO2023285213A1 publication Critical patent/WO2023285213A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • 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
    • H02K1/27—Rotor cores with permanent magnets
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • 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

Definitions

  • the invention relates to a rotor for an electrical machine with a magnet section which is arranged in an axial direction between two shaft sections.
  • a turbomachine for an energy converter with a compressor for compressing air to be supplied to the energy converter is known, with a housing and with a rotor which can rotate about an axis of rotation relative to the housing.
  • the object of the invention is to improve a rotor for an electrical machine with a magnet section, which is arranged in an axial direction between two shaft sections, functionally and/or in terms of production technology.
  • the object is achieved in a rotor for an electrical machine with a magnet section that is arranged in an axial direction between two shaft sections, in that the magnet section has a fiber-reinforced plastic matrix that surrounds a magnet device.
  • the fiber-reinforced plastic matrix is arranged radially on the outside in the magnet section.
  • the term axial refers to an axis of rotation of the rotor.
  • Axial means towards or parallel to the axis of rotation of the rotor.
  • Analog means radially across the Axis of rotation of the rotor.
  • the magnetic device is arranged radially inside the fiber-reinforced plastic matrix.
  • the electrical machine is, for example, a permanently excited synchronous machine.
  • the electrical machine is preferably integrated into a turbomachine, in particular into an electrically driven air compressor.
  • the turbomachine or the air compressor is advantageously used in a fuel cell system to provide compressed air.
  • the rotor reaches very high speeds, in particular speeds of more than fifty thousand revolutions per minute to well over one hundred thousand revolutions per minute.
  • metals or alloys, which are used to produce conventional rotors are replaced by the fiber-reinforced plastic matrix.
  • the fiber-reinforced plastic matrix can only extend in axial length over a particularly critical area, in particular only over the magnet section. However, the fiber-reinforced plastic matrix can also extend in the axial direction over the magnet section and the two shaft sections.
  • the fiber-reinforced plastic matrix can also extend over the entire length of the rotor.
  • the rotor with the magnet section and the two shaft sections can also be referred to as a rotor shaft.
  • the fiber-reinforced plastic matrix is particularly advantageously formed entirely or partially from electrically non-conductive materials. Among other things, this provides the advantage that the fiber-reinforced plastic matrix in the magnet section does not represent a conductive structure. As a result, inductive currents, which are associated with heat input into the rotor, can be prevented during operation of an electrical machine equipped with the rotor.
  • High-strength fiber materials are advantageously used to produce the fiber-reinforced plastic matrix.
  • a minimum wall thickness of the material surrounding the magnet device can be minimized in the magnet section.
  • a continuous fiber construction over the magnet section and the shaft sections, in particular over the entire axial length of the rotor, also makes it possible to eliminate joints between separate components that would otherwise be required to form the rotor. This makes it possible to produce a highly integrated rotor in a simple manner.
  • a preferred exemplary embodiment of the rotor is characterized in that the magnet device in the magnet section is integrated into a central shaft body and is surrounded radially on the outside by the fiber-reinforced plastic matrix.
  • the central shaft body is preferably connected in one piece to the shaft section.
  • the magnetic device is preferably arranged radially between the central shaft body and the fiber-reinforced plastic matrix.
  • the fiber-reinforced plastic matrix strengthens the rotor.
  • the magnetic device is stably fixed in the rotor by the fiber-reinforced plastic matrix.
  • a further preferred exemplary embodiment of the rotor is characterized in that a metal sleeve is arranged between the magnet device and the fiber-reinforced plastic matrix.
  • the metal sleeve surrounds the magnet device and can be designed in the same way or something similar to that of conventional rotors.
  • the fibre-reinforced plastic matrix effectively increases the stability of the rotor. Therefore, the metal sleeve can be designed with a lower wall thickness than in conventional rotors.
  • a further preferred exemplary embodiment of the rotor is characterized in that the fiber-reinforced plastic matrix extends in the axial direction over the shaft sections and the magnet section arranged between them.
  • the magnet section is connected to the shaft sections in a highly stable manner in a simple manner.
  • this provides the advantage that the rotor with the fiber-reinforced plastic matrix can be designed as a hollow shaft. This effectively reduces the rotating mass of the rotor.
  • a further preferred exemplary embodiment of the rotor is characterized in that the fiber-reinforced plastic matrix comprises at least one bearing section for representing a radial bearing.
  • the radial bearing is preferably an air bearing.
  • Two radial bearings and at least one axial bearing are advantageously used to mount the rotor. In operation, air bearings must reach a specified bearing load capacity before they work advantageously wear-free. At least one wear-reducing layer is therefore required at the bearing points.
  • Another preferred exemplary embodiment of the rotor is characterized in that the fiber-reinforced plastic matrix is surrounded by a bearing sleeve in the bearing section. Due to the bearing sleeve, which is preferably formed from a metallic material, the wear-minimizing layer on or on the fiber-reinforced plastic matrix can be omitted. If necessary, the wear-reducing layer is simply applied to the bearing sleeve.
  • the fiber-reinforced plastic matrix in the bearing section has such a reduced bearing diameter that the rotor in the bearing section with the bearing sleeve has the same diameter as the fiber-reinforced plastic matrix in the bearing section of adjacent rotor sections.
  • the fiber-reinforced plastic matrix preferably has a substantially constant thickness.
  • the transitions between the bearing section and the adjacent rotor sections are advantageously designed in such a way that the fibers also ensure optimal reinforcement in the fiber-reinforced plastic matrix in the transition areas.
  • the claimed design makes it possible in a simple manner to have an offset-free, continuous outside diameter of the rotor. This simplifies the manufacture of the rotor and the tools required for it. In addition, it simplifies the integration of the rotor into the electrical machine, in particular into a turbomachine or an air compressor in a fuel cell system.
  • the rotor advantageously comprises two radial bearings designed as air bearings, which preferably have the same diameter due to the claimed design with two bearing sleeves.
  • the fiber-reinforced plastic matrix at least one Bearing section includes to represent a thrust bearing.
  • the thrust bearing is advantageously designed as a two-sided or two-sided thrust bearing with a flange area that is shown with the fiber-reinforced plastic matrix. This further increases the functionality of the rotor.
  • a further preferred exemplary embodiment of the rotor is characterized in that the fiber-reinforced plastic matrix comprises at least one end section for connecting an impeller.
  • the impeller is, for example, a compressor wheel or a turbine wheel.
  • the functionality of the rotor is further increased by integrating an interface for connecting the impeller into the fiber-reinforced plastic matrix.
  • the fiber-reinforced plastic matrix has a radial cross-sectional change that serves to create a mold parting plane. This considerably simplifies demolding of the rotor. In addition, the tool costs of tools for manufacturing the rotor can be significantly reduced.
  • the radial change in cross-section includes, for example, an annular bead or a circumferential step on an outer circumference of the rotor.
  • the invention also relates to a method for producing a rotor as described above.
  • Long fibers are advantageously embedded in the plastic matrix for reinforcement.
  • the long fibers are, for example, carbon fibers or glass fibers.
  • the long fibers can also be formed from an aramid material.
  • the long fibers can be arranged radially, axially and/or in any angular position relative to an axis of rotation of the rotor.
  • the claimed manufacturing process includes fiber knitting processes and RTM processes, where the capital letters RTM stand for the English terms Resin Transfer Moulding.
  • a homogeneous distribution of mass in the fiber-reinforced plastic matrix can be realized with this production method, as a result of which undesired imbalances in the operation of an electrical machine equipped with the claimed rotor are avoided.
  • the invention may also relate to an individual part for a rotor as described above, in particular for the production of a rotor as described above. Such items can be traded separately.
  • the invention may also relate to an air compressor driven by an electric motor with a rotor as described above for use in a fuel cell system.
  • FIG. 1 shows an electrical machine with a three-part rotor shaft in longitudinal section
  • FIGS. 2 to 8 different exemplary embodiments of a rotor for the electrical machine shown in FIG. 1 with a fiber-reinforced plastic matrix.
  • FIG. 1 shows an electrically driven turbomachine 1 with a compressor wheel 2 and a turbine wheel 4 in longitudinal section.
  • the compressor wheel 2 is arranged on a compressor side 3 of the turbomachine 1 .
  • the turbine wheel 4 is arranged on a turbine side 5 of the turbomachine 1 .
  • the turbine wheel 4 is drivingly connected to the compressor wheel 2 .
  • the two wheels 2 and 4 belong to a rotor 6.
  • the rotor 6 includes a motor shaft 7.
  • the motor shaft 7 is designed as a hollow shaft and can be rotated about an axis of rotation 8.
  • the turbomachine 1 includes an electric machine 9 for the electric drive.
  • the electric machine 9 is designed as an electric motor with a motor housing 10 and a motor winding 11 .
  • a magnet 12 designed as a permanent magnet is arranged in the motor shaft 7 designed as a hollow shaft.
  • the compressor wheel 2 of the turbomachine 1 is driven on the one hand via the turbine wheel 4 .
  • the compressor wheel 2 is driven by the electric motor 9 .
  • the running gear 6 with the motor shaft 7 is rotatably mounted in the motor housing 10 of the electric machine 9 with the aid of two radial bearings 13 , 14 .
  • the radial bearings 13, 14 are advantageously designed as foil air bearings.
  • Compressor volute casing 15 includes a compressor inlet 16, via which air to be compressed is supplied to turbomachine 1.
  • a turbine volute 17 is attached to the motor housing 10.
  • the turbine volute 17 includes a turbine outlet 18 through which the expanded air exits. The energy generated when the air expands is used to drive the compressor wheel 2 .
  • the motor shaft 7 can also be referred to as a rotor shaft because it is used to represent a rotor 19 in the electrical machine 9 .
  • the rotor 19 includes a magnet section 20 in which the magnet 12 is arranged. Two shaft sections 21, 22 are fastened to the opposite ends of the magnet section 20. The magnet 12 is surrounded by a bandage 23 in the magnet section 20 .
  • FIGS 2 to 8 are exemplary embodiments of a rotor 41; 42; 43; 64; 65; 66; 67 each shown in longitudinal section.
  • the rotor 41; 42; 43; 64; 65; 66; 67 advantageously replaces the rotor 19 shown in Figure 1 in the electrical machine 9.
  • All embodiments of the rotor 41; 42; 43; 64; 65; 66; 67 has in common that they comprise a fiber-reinforced plastic matrix 47 .
  • the rotor 41; 42; 43; 64; 65; 66; 67 is designed to be rotationally symmetrical with respect to an axis of rotation 44 .
  • the rotor 41; 42; 43; 64; 65; 66; 67 includes a base body 45, which essentially has the shape of a straight circular cylinder shell.
  • a basic structure of the rotor 41; 42 is shown in Figures 2 and 3.
  • a magnet device 46 is arranged in a magnet section 20 .
  • the magnet device 46 comprises at least one permanent magnet.
  • the magnet section 20 is in the axial direction between two shaft sections 21, 22 of the rotor 41; 42 arranged.
  • the term axial refers to an axis of rotation 44 of the rotor 41; 42
  • the complete outer shell of the rotor 41 shown in FIG. 2 consists of a fiber-plastic matrix 47 that is continuous in the axial direction. Long fibers are preferably used for reinforcement. However, short fibers can also be used in the fiber-reinforced plastic matrix 47 .
  • the magnetic device 46 is completely enclosed by the fiber-reinforced plastic matrix 47 and is thus protected against being thrown out.
  • the rotor 41 includes two bearing sections 51, 52, which serve to represent two radial bearings.
  • a bearing section 53 is used to represent an axial bearing. All three bearing sections 51 to 53 are integrated into the fiber-reinforced plastic matrix 47 . Post-processing of the bearing sections 51 to 53 is advantageously not necessary.
  • the bearing sections 51 to 53 are advantageously also formed during the manufacture of the rotor 41 .
  • the fiber-reinforced plastic matrix 47 has the shape of straight circular cylinder jackets.
  • a bearing flange 54 is formed in the bearing section 53 with the fiber-reinforced plastic matrix 47 .
  • the Bearing flange 54 serves to represent a double-sided or double-sided axial bearing for the rotor 41.
  • End sections 55 and 56 of the rotor 41 are designed particularly advantageously with regard to the connection of impellers, in particular a compressor wheel and a turbine wheel.
  • two section lines 57, 58 indicate that the rotor 41 can also be designed without the end sections and the bearing section to represent the axial bearing.
  • the rotor 42 in FIG. 3 comprises only the two bearing sections 51, 52 in the shaft sections 21, 22, between which the magnet section 20 is arranged.
  • the opposite ends of the rotor 42 are shown cut away. Shaft ends that are not shown can be fastened there.
  • the shaft ends are fastened, for example, in a materially bonded manner, in particular by gluing.
  • the magnet device 46 can alternatively or additionally also include an outer magnet device 49 .
  • the outer magnet device 49 is integrated, for example, in a central shaft body 48 which is arranged together with the outer magnet device 49 inside the fiber-reinforced plastic matrix 47 .
  • dashed lines indicate that the magnet device 46 can also be surrounded by a metal sleeve 59 .
  • the metal sleeve 59 is in turn surrounded by the fiber-reinforced plastic matrix 47 in the magnet section 20 .
  • the fiber-reinforced plastic matrix 47 extends continuously in the axial direction between the shaft section 21 and the end section 56. However, the rotor 43 does not have a constant diameter in the axial direction.
  • the fiber-reinforced plastic matrix 47 has a smaller diameter than in that Magnet section 20 and in the rotor sections or shaft sections 21, 22 which are adjacent to the bearing sections 51, 52.
  • the fiber-reinforced plastic matrix 47 is combined with bearing sleeves 61, 62 in the bearing sections 51, 52.
  • the bearing sleeves 61, 62 are advantageously formed from a metal and replace an otherwise required coating of the fiber-reinforced plastic matrix 47 in the bearing sections 51, 52.
  • the bearing sleeves 61, 62 are advantageously provided with a wear-minimizing coating.
  • the fiber-reinforced plastic matrix 47 is embedded in the bearing sleeves 61, 62, so to speak.
  • the fiber-reinforced plastic matrix 47 has a smaller diameter than in the magnet section 20 and than in the shaft sections 21, 22. This advantageously means that the fiber-reinforced plastic matrix 47 in the magnet section 20 and in the shaft sections 21, 22 has the same outer diameter as the bearing sleeves 61, 62.
  • a preferably continuous fiber flow in the fiber-reinforced plastic matrix 47 is ensured in the transition areas.
  • an offset-free, continuous outer diameter of the rotor 43 is also made possible in the bearing sections 51, 52 with the bearing sleeves 61, 62.
  • the bearing sleeves 61, 62 advantageously have the same outside diameter.
  • FIG. 5 and 6 are two embodiments of the rotor 64; 65, which serve to create a zone free of parting seams in the area of the air bearings in the circumferential direction.
  • the fiber-reinforced plastic matrix 47 is hardened under vacuum during production, for example in multi-part tools. Seams are inevitable when demolding.
  • a tool parting plane can be arranged radially by means of a targeted radial change in cross section 68 . This creates a separating seam in the circumferential direction of the rotor 64; 65
  • the radial change in cross section 68 includes an annular bead 69 on the outer circumference of the fiber-reinforced plastic matrix 47. Radially on the inside, the rotor 64 has a constant inner diameter 73.
  • the radial cross-sectional change 68 includes a step 70 on an outer circumference of the fiber-reinforced plastic matrix 47.
  • Tool bodies 71, 72 are indicated radially on the inside. The tool body 71 has a larger outside diameter than the tool body 72. This means that the fiber-reinforced plastic matrix 47 in FIG. 6 on the left has an inside diameter 74 that is larger than an inside diameter 75 on the right in FIG.
  • the fiber reinforced plastic matrix 47 is reinforced with non-conductive reinforcing fibers 77 in the magnet section 20 .
  • the non-conductive reinforcing fibers 77 are glass fibers, for example.
  • the laying direction of the non-conductive reinforcing fibers 77 runs in FIG. 7 in only one diagonal direction.
  • the fiber-reinforced plastic matrix 47 of the rotor 66 also includes conductive reinforcement fibers 76 in addition to the non-conductive reinforcement fibers 77.
  • the conductive reinforcement fibers 76 are arranged perpendicular to the non-conductive reinforcement fibers 77.
  • the conductive reinforcing fibers 76 are carbon fibers, for example, which have a higher strength than the glass fibers. However, the resulting heat input in the rotor 66 is tolerable, since the induction in the shaft sections 21, 22 is significantly weaker than in the magnet section 20.
  • the fiber-reinforced plastic matrix 47 includes unidirectional conductive reinforcement fibers 79.
  • the conductive reinforcement fibers 79 are, for example, carbon fibers, which are also referred to as carbon fibers for short.
  • the fiber-reinforced plastic matrix 47 includes diagonally arranged non-conductive reinforcing fibers 78.
  • the conductive reinforcing fibers 79 provide high longitudinal strength and high rigidity of the rotor 67 .
  • the carbon fibers 79 are advantageously integrated into the fiber-reinforced plastic matrix 47 as open conductors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un rotor (19) pour une machine électrique (9), comprenant une partie aimant (20) qui est disposée dans une direction axiale entre deux sections d'arbre (21, 22). Afin d'améliorer le rotor (19) en termes de fonctionnalité et/ou de son procédé de fabrication, la partie aimant (20) présente une matrice en matière plastique renforcée par des fibres qui entoure un dispositif magnétique.
PCT/EP2022/068629 2021-07-13 2022-07-05 Rotor pour une machine électrique WO2023285213A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021207399.9A DE102021207399A1 (de) 2021-07-13 2021-07-13 Rotor für eine elektrische Maschine
DE102021207399.9 2021-07-13

Publications (1)

Publication Number Publication Date
WO2023285213A1 true WO2023285213A1 (fr) 2023-01-19

Family

ID=82703106

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/068629 WO2023285213A1 (fr) 2021-07-13 2022-07-05 Rotor pour une machine électrique

Country Status (2)

Country Link
DE (1) DE102021207399A1 (fr)
WO (1) WO2023285213A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007006986B3 (de) * 2007-02-07 2008-06-19 Ima Materialforschung Und Anwendungstechnik Gmbh Rotor für eine schnell laufende elektrische Maschine
DE102015109030A1 (de) * 2014-06-16 2015-12-17 Fanuc Corporation Rotorbauteil, welches an einer drehbaren Welle einer elektrischen Dreh-Maschine fixiert ist, Rotor, drehbare elektische Maschine und Verfahren zur Demontage eines Rotors
DE102015016607A1 (de) 2015-12-22 2016-08-11 Daimler Ag Strömungsmaschine für einen Energiewandler und Verfahren zum Lagern eines Laufzeugs einer Strömungsmaschine
DE102015007128A1 (de) * 2015-06-02 2016-12-08 Daimler Ag Verfahren zum Herstellen eines Laufzeugs für eine Strömungsmaschine, insbesondere für einen Energiewandler
DE102017210386A1 (de) * 2016-06-24 2017-12-28 Fanuc Corporation Rotor-Element, Rotor und elektrischer Motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007006986B3 (de) * 2007-02-07 2008-06-19 Ima Materialforschung Und Anwendungstechnik Gmbh Rotor für eine schnell laufende elektrische Maschine
DE102015109030A1 (de) * 2014-06-16 2015-12-17 Fanuc Corporation Rotorbauteil, welches an einer drehbaren Welle einer elektrischen Dreh-Maschine fixiert ist, Rotor, drehbare elektische Maschine und Verfahren zur Demontage eines Rotors
DE102015007128A1 (de) * 2015-06-02 2016-12-08 Daimler Ag Verfahren zum Herstellen eines Laufzeugs für eine Strömungsmaschine, insbesondere für einen Energiewandler
DE102015016607A1 (de) 2015-12-22 2016-08-11 Daimler Ag Strömungsmaschine für einen Energiewandler und Verfahren zum Lagern eines Laufzeugs einer Strömungsmaschine
DE102017210386A1 (de) * 2016-06-24 2017-12-28 Fanuc Corporation Rotor-Element, Rotor und elektrischer Motor

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Publication number Publication date
DE102021207399A1 (de) 2023-01-19

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