WO2024255950A1 - Rotor und elektrische maschine - Google Patents
Rotor und elektrische maschine Download PDFInfo
- Publication number
- WO2024255950A1 WO2024255950A1 PCT/DE2024/100447 DE2024100447W WO2024255950A1 WO 2024255950 A1 WO2024255950 A1 WO 2024255950A1 DE 2024100447 W DE2024100447 W DE 2024100447W WO 2024255950 A1 WO2024255950 A1 WO 2024255950A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- segments
- magnet
- magnetic
- group
- 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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset 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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2793—Rotors axially facing stators
Definitions
- the present invention relates to a rotor for an electrical machine comprising a plurality of magnetic elements which are arranged in the rotor in a manner distributed over the circumference, wherein the magnetic elements are each formed from magnetic segments which are fixed axially to one another.
- the invention further relates to an electrical machine.
- Electric motors are increasingly being used to power motor vehicles in order to create alternatives to combustion engines that require fossil fuels.
- Considerable efforts have already been made to improve the everyday suitability of electric drives and to offer users the driving comfort they are used to.
- a particular challenge in the manufacture and operation of a rotor of an electrical machine is the design and arrangement of the magnetic elements in a rotor.
- Such rotors of internal rotors with surface magnets are provided with a pre-tensioned bandage, especially in applications with high speeds, to prevent the magnets from lifting off due to centrifugal force. Direct gluing of the magnets is often not safe and is therefore avoided.
- Banding is very easy to design and can be very thin and with little or no eddy current losses.
- the enlarged magnetic air gap caused by the wall thickness of the bandage always remains a disadvantage of this system.
- segmentation does not have to be as fine due to the lower conductivity and the less strongly changing magnetic field, but for very demanding applications, segmentations of a few millimeters up to 0.5 mm are used. These segments are then glued together to form stacks, for example, and then magnetized.
- a rotor for an electrical machine comprising a plurality of magnetic elements which are arranged in the rotor in a manner distributed over the circumference, wherein the magnetic elements are each formed from magnetic segments which are fixed axially to one another, wherein a first group of the magnetic segments and at least one second group of the magnetic segments which is axially spaced from the first group are separated from one another by a reinforcing layer which runs in a radial plane.
- the first group of magnet segments and the second group of magnet segments are axially directly adjacent, so that the reinforcing layer is in contact with both the first group of magnet segments and the second group of magnet segments.
- a further group of magnet segments to be arranged axially between the first and second groups of magnet segments, so that the reinforcing layer is in contact with either only the first group or the second group of magnet segments.
- the magnet segments of the magnet elements are each axially separated from one another by a reinforcing layer running in a radial plane.
- One of the core ideas of the invention is therefore to use the segmentation of the magnetic elements not only to reduce eddy currents, but also to introduce a reinforcing layer in the adhesive gap between two adjacent magnetic segments in addition to an adhesive, which preferably dissipates the centrifugal forces radially inwards into the rotor shaft and/or, for example, tangentially to a ring stress.
- the reinforcing layers could be introduced into the magnet stack in every segmentation gap or just at intervals.
- a radially outer bandage of the rotor can have a very small radial thickness.
- a radially outer bandage of the rotor can be dispensed with.
- the reinforcement layers are preferably made of materials with low electrical conductivity and high rigidity and strength, which makes modern fiber composites such as carbon fiber reinforced plastics particularly suitable. These can be produced or incorporated into the rotor structure, for example, by gluing or by direct lamination in a fiber composite process such as prepreg, wet laminate or RTM.
- the reinforcement layers preferably overlap the magnet segments over their entire surface in order to maximize the adhesive surface.
- a partial overlap, possibly also through a step in a magnet segment, to maximize the magnet material at the air gap would be conceivable, as would a continuous or local folding of the reinforcement layer on the outer diameter of a magnet segment in order to generate an additional form fit.
- Such an embodiment can be particularly advantageous in a rotor configuration with center magnets of a Hallbach array.
- a rotor is the rotating part of an electrical machine.
- the rotor comprises in particular a rotor shaft.
- the rotor shaft can be hollow, which on the one hand results in a weight saving and on the other hand allows the supply of lubricant or coolant to the rotor body.
- a rotor body is understood to mean the rotor without the rotor shaft.
- the rotor body can, for example, be composed of a rotor lamination stack and the Permanent magnets and any axial cover parts that may be present to close the pockets. It is also conceivable that the permanent magnets are not positioned in pockets, but as surface magnets in the rotor body.
- a rotor shaft is a rotatably mounted shaft of an electrical machine to which the rotor or rotor body is rotationally coupled.
- the magnetic elements can be designed as permanent magnets, for example.
- the magnetic elements are preferably designed to be essentially identical.
- the permanent magnets can preferably be selected from the group of neodymium-iron-boron (NdFeB) magnets, samarium-cobalt (SmCo) magnets, ferrite magnets or alnico magnets.
- NdFeB magnets are among the strongest permanent magnets currently commercially available and are therefore particularly suitable for high-performance applications where a high magnetic field strength is required.
- SmCo magnets are also powerful permanent magnets with high magnetic energy, which are particularly characterized by high temperature resistance.
- Ferrite magnets also known as ceramic magnets, are inexpensive and have good resistance to corrosion and demagnetization.
- Alnico magnets consist of an alloy of aluminum, nickel, cobalt and iron. They are characterized by high remanence (residual magnetization) and good temperature resistance. Alnico magnets are often used in applications where high magnetic stability and good resistance to extreme temperatures are required.
- the magnet elements have the same number of magnet segments. It is also preferred that all magnet segments are shaped substantially identically. By using identical magnet segments, a standardized manufacturing process can be applied. This enables mass production of the magnets, resulting in efficient and cost-effective manufacturing. Using identical shapes reduces the complexity and the number of different parts that need to be manufactured and managed. If all magnet segments are identical, assembly of the rotor is also easier and faster. The segments can be joined together in a repetitive and uniform manner without the need for complicated adjustment or individual alignment is required. This facilitates automated assembly and reduces working time and susceptibility to errors. Identical magnet segments also enable easier replacement in the event of repair or maintenance.
- a magnet segment If a magnet segment is damaged, it can easily be replaced with an identical segment without the need for specific adjustments or adjustments to the magnetic configuration of the rotor. This makes maintenance easier and reduces machine downtime.
- the use of identical magnet segments can also make the design of the rotor more flexible.
- the same shape of the segments allows the number of segments or the magnetic arrangement to be varied to meet the specific requirements of the application. This enables an optimized design of the rotor and adaptation to different power and application areas. Finally, this can also achieve a high level of consistency in the magnetic properties of the rotor, since all segments go through the same manufacturing process and therefore have similar magnetic properties, which can help to generate a uniform magnetic field.
- the electrical machine can be designed in particular as a rotary machine.
- the rotary machine can be configured in particular as a radial flux machine.
- a radial flux machine is characterized by the fact that the magnetic field lines in the air gap formed between the rotor and stator extend in a radial direction.
- the gap between the rotor and the stator is referred to as the air gap.
- this is a gap that is circular in cross-section and has a radial width that corresponds to the distance between the rotor body and the rotor body.
- the electrical machine in principle, in connection with this invention, it is also possible for the electrical machine to be designed as an axial flux machine.
- the electric machine can further comprise a control device.
- a control device as can be used in the present invention is used in particular for the electronic control and/or regulation of one or more technical systems of the electrical machine.
- the electric machine is particularly intended for use within a drive train of a hybrid or fully electric motor vehicle.
- the electric machine is dimensioned such that vehicle speeds of greater than 50 km/h, preferably greater than 80 km/h and in particular greater than 100 km/h can be achieved.
- the electric motor particularly preferably has an output of greater than 30 kW, preferably greater than 50 kW and in particular greater than 70 kW.
- the electric machine provides rotational speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, very particularly preferably greater than 12,500 rpm, most preferably greater than 25,000 rpm.
- the electric machine can preferably also be installed in an electrically operated axle drive train.
- An electric axle drive train of a motor vehicle comprises an electric machine and a transmission, wherein the electric machine and the transmission form a structural unit.
- the electric machine and the transmission are arranged in a common drive train housing.
- a drive train housing can also form a connection structure for the electric machine.
- the electric machine it would of course also be possible for the electric machine to have a motor housing and the transmission to have a transmission housing, wherein the structural unit can then be effected by fixing the transmission relative to the electric machine.
- This structural unit is sometimes also referred to as an E-axle.
- the reinforcement layers and the magnet segments are connected to one another in a material-locking manner.
- the respective reinforcement layers are connected to the magnet segments by means of an adhesive connection, which in terms of production technology is has proven to be particularly advantageous.
- Adhesives that are suitable for connecting reinforcement layers and magnet segments can, for example, be selected from the group of epoxy resins, polyurethanes or acrylates. Both the reinforcement layer and the magnet segments can be ground or sandblasted or otherwise activated before bonding to ensure better adhesion of the adhesive.
- the adhesive can be applied to one or both sides, depending on the design requirements.
- the adhesive can preferably be cured at room temperature or by means of heat treatment. It would also be possible to connect the reinforcement layers and the magnet elements by means of hot gluing.
- the reinforcement layer can also be directly impregnated with a resin. This can be done as a prepreg, wet laminate or using the RTM injection process.
- the reinforcement layers and the magnet segments could be connected by means of sintering. In this case, a firm connection is created between the reinforcement layers and the magnet segments using pressure and heat. It is advantageous if the corresponding surface of the reinforcement layer is made of a metallic material.
- the reinforcing layers are made from a fiber-reinforced material.
- the reinforcing layers are particularly preferably made from a fiber-reinforced plastic.
- the reinforcement layers preferably have a layer thickness of between 0.005-1 mm, preferably between 0.0075-0.5, most preferably between 0.02-0.2 mm.
- the use of thin reinforcement layers can improve the magnetic flux density of the machine, as this enables a higher magnetic fill factor to be achieved.
- the low layer thickness of the reinforcement layers enables a higher degree of lamination of the magnets with a good fill factor. This also reduces eddy current losses, as this reduces the cross section for the eddy current paths, which leads to lower losses and improved energy efficiency.
- a thinner reinforcement layer also leads to less material being used and This results in a lower weight for both the rotor and the stator. It also makes installation easier in applications where space is limited.
- the rotor can also have a lower inertia, which enables higher speeds. This is particularly advantageous in applications where high speeds are required, such as in electric vehicles or high-speed machines.
- the reinforcement layers are preferably designed to be essentially identical.
- the reinforcement layers can be designed as a segment or as a ring, or a combination of both.
- the individual reinforcement layers can overlap or be offset tangentially to one another.
- the fiber orientation of the reinforcement layers is preferably radial and/or tangential, only very small circular currents (eddy currents) are formed. This means that, unlike with a bandage, fibers can also be used that have a low electrical conductivity.
- the reinforcement layers are not made of magnetic material or material that conducts magnetic flux, which is generally preferred.
- the reinforcement layers can be made of magnetic material or material that conducts magnetic flux, since the reinforcement layers in a permanently excited rotor configured for a radial flux machine are not in the magnetic, radial flux direction and therefore do not hinder it.
- the rotor does not have an outer bandage.
- the absence of an outer bandage minimizes the eddy current losses in the machine.
- eddy currents can occur in the bandage, which can lead to losses and heating.
- Omitting the outer bandage these losses are reduced and the efficiency of the machine is improved. Omitting the outer bandage also simplifies the manufacture and assembly of the rotor. Need to manufacture, machine and assemble the bandage separately. This can lead to cost and time savings in production.
- the elimination of the bandage makes it possible to reduce the magnetic air gap, which leads to an increase in the torque yield.
- the elimination of the bandage which can be seen as a thermal barrier layer, enables significantly improved heat dissipation of the rotor via the stator cooling, since the rotor losses can be transferred directly to the stator package.
- the rotor is configured as a permanently excited rotor for a radial flux machine.
- the magnetic elements are designed as surface magnets on the rotor.
- the magnetic elements are therefore preferably not arranged in pockets of the rotor body.
- the surface magnets are in direct contact with the air gap between the stator and the rotor of a radial flux machine with their radially outer surface.
- Surface magnets are often used in permanently excited rotors of electrical machines, such as in permanent magnet synchronous machines (PMSM) or permanent magnet direct current machines (PMDC).
- PMSM permanent magnet synchronous machines
- PMDC permanent magnet direct current machines
- These magnets can be made of neodymium iron boron (NdFeB) or samarium cobalt (SmCo), for example, since these materials have high magnetic energy and good magnetic properties.
- the construction of surface magnets in a permanent magnet rotor consists of several steps. First, the magnets are formed into the desired shape, which can vary depending on the application. Preferably, they are manufactured in a rectangular or trapezoidal shape to ensure optimal magnetic utilization. The magnets can then be attached to a metal or plastic surface, such as an inner ring, using a special adhesive or resin. This surface can either be part of the rotor or applied to the rotor.
- One advantage of surface magnets is their high magnetic field strength and efficiency compared to other excitation methods. They offer improved power density, lower weight and inertia, higher speed and better responsiveness to load changes. These advantages are particularly evident in surface magnets in a "Halbach arrangement". In addition, they enable a compact design of the machine and reduce the energy loss associated with excitation.
- the magnetic elements each have a first end face and a second end face and the reinforcing layers cover the end faces, at least in sections, preferably completely.
- Complete coverage has the advantage, for example, of a particularly good adhesive bond and thus a good force transmission from a magnetic segment to a reinforcing layer.
- At least two axially spaced reinforcement layers are connected to one another. This makes it possible in particular to achieve the effect that a reinforcement layer can be placed around the rotor magnet segments, which can bring advantages in terms of manufacturing. Furthermore, such a connection of reinforcement layers can lead to improved power transmission.
- the invention can also be further developed in such a way that the rotor is made of laminated material and that a reinforcing layer runs between at least one group of the rotor sheets. It would therefore also be conceivable to additionally reinforce laminated rotors for high-speed applications using fiber composite layers. Such reinforcing layers can preferably also overlap with inner rings placed on the inner diameter of the magnet segments, which absorb the forces of the magnet segments and transmit the torque.
- the reinforcement layers are designed in the form of circular disks. This means that forces occurring during operation can be transmitted in both the circumferential and radial directions. In principle, however, shapes of the reinforcement layers other than the circular disk are also possible. For example, it would also be conceivable for the reinforcement layers to be designed as radially extending web-like elements that run like rays of sunshine from the radially inside to the outside, but are not connected in the circumferential direction.
- the rotor has a plurality of inner rings, on which the magnet segments rest radially and to which the reinforcement layers are fixed.
- These inner rings can also be made of fiber composite material.
- the inner rings can also take over the correct positioning of the magnet segments when assembling the rotor.
- the inner rings also advantageously produce the force and torque transmission by means of a force or form fit to the rotor shaft.
- the number of inner rings corresponds to the number of magnet segments per magnet element, which can contribute to a particularly uniform power transmission and a particularly high speed stability of the rotor.
- Such an electric machine with a permanently excited rotor can help create powerful and efficient electric drives that can be used in various applications such as electric vehicles, industrial robots, wind turbines and other fields.
- the invention will be explained in more detail below with reference to figures without limiting the general inventive concept.
- Figure 1 shows a radial flow machine in an axial section view
- Figure 2 shows a rotor section in an exploded view
- Figure 3 shows a first embodiment of a magnet segment reinforcement layer configuration in a schematic axial sectional view
- Figure 4 shows a second embodiment of a magnet segment reinforcement layer configuration in a schematic axial sectional view
- Figure 5 shows a third embodiment of a magnet segment reinforcement layer configuration in a schematic axial sectional view.
- Figure 1 shows a rotor 1 for an electric radial flow machine 2 comprising a plurality of magnetic elements 3 which are arranged distributed over the circumference in the rotor 1, wherein the magnetic elements 3 are each formed from magnetic segments 4 which are fixed axially to one another.
- the individual magnetic elements 3 lie against one another in the circumferential direction, which can be clearly seen from Figure 2.
- the individual magnetic segments 4 are designed to be essentially identical.
- the rotor 1 constructed in this way is arranged between the cylindrical ring-like stator 10 of the radial flow machine 2. Even though Figure 1 shows a radial flux machine 2, it is of course understood that a rotor 1 according to the invention can also be used for an axial flux machine.
- the magnet segments 4 are each separated from one another by a reinforcing layer 6 running in a radial plane 5, which can be clearly seen from a comparison of Figure 1 with Figure 2.
- the respective reinforcing layers 6 are connected to the magnet elements 4 by means of an adhesive bond.
- the reinforcement layers 6 are made of a fiber-reinforced material.
- the magnetic elements 3 each have a first end face 7 and a second end face 8, with the ring-disk-like reinforcement layers 6 completely covering the end faces 7, 8.
- the rotor 1 further comprises a plurality of inner rings 9, against which the magnet segments 4 rest radially and to which the reinforcement layers 6 are fixed.
- the number of inner rings 9 preferably corresponds to the number of magnet segments 9 per magnet element 3.
- the rotor 1 can also have a first group 11 of magnet segments 4 and a second group 12 of magnet segments 4 axially spaced from the first group 11, wherein one or more reinforcing layers 6 can be arranged in various ways between these groups 11, 12.
- two reinforcement layers 6 are arranged in the rotor 1, but between the two reinforcement layers 6 a magnet segment from the first group 11 and the second group 12 lie axially directly against each other.
- Figure 5 shows a further preferred embodiment of the rotor 1, in which a reinforcing layer 6 is present between all magnet segments of the groups 11, 12, which leads to a particularly good and secure radial fixation of the magnet segments 4, in particular in high-speed applications.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24729182.6A EP4728621A1 (de) | 2023-06-16 | 2024-05-15 | Rotor und elektrische maschine |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023115829.5 | 2023-06-16 | ||
| DE102023115829.5A DE102023115829A1 (de) | 2023-06-16 | 2023-06-16 | Rotor und elektrische Maschine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024255950A1 true WO2024255950A1 (de) | 2024-12-19 |
Family
ID=91302577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2024/100447 Ceased WO2024255950A1 (de) | 2023-06-16 | 2024-05-15 | Rotor und elektrische maschine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4728621A1 (de) |
| DE (1) | DE102023115829A1 (de) |
| WO (1) | WO2024255950A1 (de) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10236609A1 (de) * | 2002-06-22 | 2004-01-08 | Zf Friedrichshafen Ag | Synchronmaschine und Verfahren zur Montage der Synchronmaschine |
| DE102008055893A1 (de) | 2008-10-31 | 2010-05-12 | Esw Gmbh | Rotor für eine schnell drehende permanenterregte elektrische Maschine und Verfahren zur Herstellung eines solchen Rotors |
| DE102009054191A1 (de) * | 2009-11-20 | 2011-05-26 | Esw Gmbh | Vorrichtung und Verfahren zur Befestigung von Magneten auf einen Rotor |
| US20160020008A1 (en) * | 2013-03-08 | 2016-01-21 | Magnomatics Limited | Apparatus and methods for magnet retention |
| EP2973946B1 (de) * | 2013-04-16 | 2017-02-22 | Siemens Aktiengesellschaft | Verfahren zum herstellen eines einzelsegmentläufers und entsprechender läufer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5238231B2 (ja) * | 2007-11-28 | 2013-07-17 | 株式会社東芝 | 回転電機の回転子 |
| EP2793362B1 (de) * | 2013-04-15 | 2015-06-17 | Siemens Aktiengesellschaft | Reluktanzmotor und zugehöriger Rotor |
| DE102014213508A1 (de) * | 2014-07-11 | 2016-01-14 | Robert Bosch Gmbh | Scheibenläufer für eine elektrische Maschine |
| US10826344B2 (en) * | 2016-11-17 | 2020-11-03 | General Electric Company | High speed electric machine with embedded rotor magnets |
| DE102017223622A1 (de) * | 2017-12-21 | 2019-06-27 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Rotor für einen Elektromotor und Elektromotor |
| KR102626459B1 (ko) * | 2018-09-03 | 2024-01-18 | 엘지이노텍 주식회사 | 모터 |
-
2023
- 2023-06-16 DE DE102023115829.5A patent/DE102023115829A1/de active Pending
-
2024
- 2024-05-15 WO PCT/DE2024/100447 patent/WO2024255950A1/de not_active Ceased
- 2024-05-15 EP EP24729182.6A patent/EP4728621A1/de active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10236609A1 (de) * | 2002-06-22 | 2004-01-08 | Zf Friedrichshafen Ag | Synchronmaschine und Verfahren zur Montage der Synchronmaschine |
| DE102008055893A1 (de) | 2008-10-31 | 2010-05-12 | Esw Gmbh | Rotor für eine schnell drehende permanenterregte elektrische Maschine und Verfahren zur Herstellung eines solchen Rotors |
| DE102009054191A1 (de) * | 2009-11-20 | 2011-05-26 | Esw Gmbh | Vorrichtung und Verfahren zur Befestigung von Magneten auf einen Rotor |
| US20160020008A1 (en) * | 2013-03-08 | 2016-01-21 | Magnomatics Limited | Apparatus and methods for magnet retention |
| EP2973946B1 (de) * | 2013-04-16 | 2017-02-22 | Siemens Aktiengesellschaft | Verfahren zum herstellen eines einzelsegmentläufers und entsprechender läufer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102023115829A1 (de) | 2024-12-19 |
| EP4728621A1 (de) | 2026-04-22 |
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