EP4483475A1 - Isolationsring, stator und verfahren zur herstellung eines stators - Google Patents
Isolationsring, stator und verfahren zur herstellung eines statorsInfo
- Publication number
- EP4483475A1 EP4483475A1 EP22843112.8A EP22843112A EP4483475A1 EP 4483475 A1 EP4483475 A1 EP 4483475A1 EP 22843112 A EP22843112 A EP 22843112A EP 4483475 A1 EP4483475 A1 EP 4483475A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- insulating ring
- winding
- ring
- base body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
-
- 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
- H02K15/10—Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes
- H02K15/104—Insulating between conductors
-
- 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
- H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
Definitions
- the present invention relates to an insulating ring for a winding overhang of a hairpin winding of a stator of an electrical machine within a drive train of a motor vehicle, the insulating ring having an annular disk-shaped base body with a plurality of openings extending axially through the base body, each opening from the free Ends of a hairpin conductor bar pair are at least partially penetrated.
- the invention also relates to a stator and a method for producing a stator.
- Electric motors are increasingly being used to drive motor vehicles in order to create alternatives to internal combustion engines that require fossil fuels.
- Significant efforts have already been made to improve the suitability for everyday use of electric drives and also to be able to offer users the driving comfort they are accustomed to.
- hybrid drive trains are also known.
- Such drive trains of a hybrid vehicle usually include a combination of an internal combustion engine and a Electric motor, and enable - for example in urban areas - a purely electric mode of operation with simultaneous sufficient range and availability, especially for overland journeys.
- stator windings are therefore typically in the form of hairpin windings.
- essentially U-shaped wire segments are introduced into the stator slots from one end face of the stator and then reshaped on an opposite end face of the stator and connected, for example, by welding.
- closed caps for isolating the hairpin ends are also known from the prior art Winding head of a hairpin winding known.
- An example of this is disclosed in JP2000209802A.
- an insulating ring for a winding overhang of a hairpin winding of a stator of an electrical machine within a drive train of a motor vehicle, the insulating ring having an annular disk-shaped base body with a plurality of openings extending axially through the base body, each opening from the free ends of a pair of hairpin conductor bars can be reached through at least in sections, with at least one spacer element extending out of the base body in a first axial direction and at least one holding element extending out of the base body in a second axial direction.
- the insulating ring can be placed axially on a stator in a simple manner, the axial distance between the stator and the base body being defined by the at least one spacer element.
- the at least one spacer element forms an axial stop for the insulating ring relative to the stator.
- the insulating ring can be held by means of the at least one holding element, for example by means of a corresponding tool, and pushed onto the winding overhang of the hairpin winding.
- the stator according to the invention is intended for use in an electrical machine.
- the electrical machine is used to convert electrical energy into mechanical energy and/or vice versa, and it generally includes the stationary part, referred to as the stator, stand or armature, and a part that is referred to as the rotor or runner and is arranged such that it can move, in particular rotate, relative to the stationary part Part.
- the electric machine is dimensioned in such a way that vehicle speeds of more than 50 km/h, preferably more than 80 km/h and in particular more than 100 km/h can be achieved.
- the electric motor particularly preferably has an output of more than 30 kW, preferably more than 50 kW and in particular more than 70 kW.
- the electrical machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, very particularly preferably greater than 12,500 rpm.
- the stator can in particular be energized by power electronics.
- the power electronics is preferably a combination of different components that control or regulate a current to the stator, preferably including the peripheral components required for this purpose, such as cooling elements or power supply units.
- the power electronics contain one or more power electronics components that are set up to control or regulate a current. This is particularly preferably one or more power switches, e.g. power transistors.
- the power electronics particularly preferably have more than two, particularly preferably three, phases or current paths which are separate from one another and each have at least one separate power electronics component.
- the power electronics are preferably designed to control a power per phase with a peak power, preferably continuous power, of at least 10 W, preferably at least 100 W, particularly preferably at least 1000 W regulate.
- motor vehicles are land vehicles that are moved by machine power without being tied to railroad tracks.
- a motor vehicle can be selected, for example, from the group of passenger cars (cars), trucks (lorries), mopeds, light motor vehicles, motorcycles, buses (COM) or tractors.
- the stator according to the invention can preferably be configured for a radial flux machine.
- the stator of a radial flow machine is usually constructed cylindrically or in the form of a cylindrical ring and generally consists of a stator body which is formed by electrical laminations which are electrically insulated from one another and are constructed in layers and packaged to form laminated cores. This structure keeps the eddy currents in the stator caused by the stator field low.
- stator slots are let into the electrical sheet running parallel to the rotor shaft and accommodate the stator winding or parts of the stator winding.
- the slots can be closed with locking elements such as locking wedges or covers or the like in order to prevent the stator winding from being detached.
- the stator body is preferably designed in one piece.
- a one-piece stator body is characterized in that the entire stator body is formed in one piece, viewed circumferentially.
- the stator body is generally formed from a large number of stacked, laminated electrical laminations, each of the electrical laminations being closed to form a circular ring.
- the individual laminations can be held together in the stator body, for example, by gluing, welding or screwing.
- stator teeth of the stator are preferably formed in the stator body.
- Stator teeth are components of the stator body that are circumferentially spaced, tooth-like radially inward (internal rotor) or radially outward (Outer rotor) directed parts of the stator body are formed and an air gap for the magnetic field and for the rotational movement of the rotor is formed between the free ends and a rotor body.
- the non-magnetic gap between the rotor and the stator is called the air gap.
- this is, for example, an essentially annular gap with a radial width that corresponds to the distance between the rotor body and the stator body.
- a stator winding is embedded in the stator slots of the stator according to the invention.
- a stator winding includes electrically conductive conductors whose length is significantly greater than their diameter.
- the stator winding can have any desired cross-sectional shape. Rectangular cross-sectional shapes are preferred, since they can be used to achieve high packing densities and consequently high power densities.
- a stator winding made of copper is very particularly preferably formed. According to the invention, the stator winding is designed as a hairpin winding.
- the insulating ring is preferably made of a material that is not electrically conductive or at least only weakly conductive.
- the insulating ring can be formed from a ceramic or a plastic, for example.
- the plastic is preferably a fiber-reinforced plastic.
- the insulating ring is most preferably formed from a plastic by means of an injection molding process.
- the openings of the insulating ring are preferably arranged along concentric diameters in the annular disk-shaped base body. Furthermore, the openings are preferably positioned equidistantly from one another on a diameter. In this regard, it is further preferred that the openings are positioned on the concentric diameters in circumferentially distributed groups of radially aligned openings. It is also highly preferred in this respect that openings of a group which are arranged radially aligned are spaced equidistantly from one another. It is also highly preferred that the openings are shaped substantially identically. It may be preferred that an opening in the Is substantially rectangular in shape with rounded corners and its longitudinal extent is oriented in the circumferential direction of the insulating ring.
- the insulating ring can be designed in one piece or in several parts.
- the base body of the insulating ring is preferably formed in one piece, more preferably monolithically.
- the insulating ring it would also be possible for the insulating ring to be formed from a plurality of ring segments which are connected to one another in a materially, non-positively and/or form-fitting manner.
- the at least one spacer element is formed in one piece, preferably monolithically, with the base body.
- the spacer element it would also be conceivable for the spacer element to be formed from a material that differs from the material of the base body. It would also be possible to design the spacer element as a component that is separate from the base body and that is connected to the base body in a form-fitting, force-fitting and/or cohesive manner.
- the holding element can preferably be formed in one piece, in particular also monolithically, with the base body of the insulating ring.
- the holding element it would also be conceivable for the holding element to be formed from a material that differs from the material of the base body. It would also be possible to design the holding element as a component that is separate from the base body and is connected to the base body in a form-fitting, non-positive and/or cohesive manner.
- the insulating ring has at least three spacer elements and/or at least three holding elements.
- the advantage of this configuration is that it allows statically determined supports or contacts to be provided which prevent the insulating ring from tilting unintentionally, for example on the end face of the stator.
- the spacer elements and/or the holding elements are arranged equidistantly along the circumference of the insulating ring, which further increases the tilting security of the insulating ring.
- the at least three spacer elements can be designed as webs.
- the spacer elements are preferably designed in the manner of segments of a circular ring shell.
- the spacer elements are preferably arranged on the radially outer diameter of the annular disk-like base body. Furthermore, it may be preferable for the spacer elements to extend in a trapezoidal shape in the axial direction, with the long trapezoidal side facing the base body and the short trapezoidal side facing the stator. Most preferably, the at least three spacer elements are formed in the same part. According to a further, highly preferred embodiment of the invention, the insulating ring has exactly three spacer elements. All of these measures can support the lightweight construction of the electrical machine by the spacer elements being designed only for the axial positioning of the insulating ring relative to the stator.
- the at least three holding elements can be designed as webs.
- the webs are preferably configured in a cylindrical manner.
- the holding elements are preferably arranged on the radially outer diameter of the annular disk-like base body.
- the at least three holding elements are formed in the same part.
- the insulating ring has exactly three holding elements. All of these measures can support the lightweight construction of the electrical machine by the holding elements being designed only for the axial and circumferential positioning of the insulating ring relative to a tool.
- the spacer elements and the holding elements each form pairs assigned to one another, which are each positioned in a common circumferential segment of the insulating ring.
- the object of the invention is also achieved by a stator for an electrical machine within a drive train of a motor vehicle, the stator being in the form of a cylindrical ring and a winding overhang of a hairpin winding extending axially out of the stator on at least one axial end face, the free ends of a
- a plurality of hairpin conductor bar pairs are accommodated in openings of an insulation ring according to claim, wherein at least these Openings are filled with a preferably electrically insulating potting compound and the insulating ring rests against the axial end face of the stator via the at least one spacer element extending axially out of the base body of the insulating ring, without torques being able to be transmitted between the insulating ring and the stator.
- the effect can be achieved that no vibrations are transmitted to the insulation ring in the circumferential direction during operation of the stator, as a result of which the insulation of the hairpin winding head can be made significantly more durable against unwanted cracking. Also, if cracking occurs in the potting compound, the isolation ring will help reduce the propagation of such cracks and prevent or reduce further damage from electrical leakage.
- the invention can also be further developed to the effect that the at least one spacer element has no casting compound on its section that contacts the stator, which can also contribute to the lightweight construction of the stator.
- the at least one retaining element of the insulating ring projects out of the casting compound in the axial direction or is at least not covered by casting compound in the circumferential direction.
- the insulating ring is fixed relative to the hairpin winding in the circumferential direction, in the radial direction and in an axial direction only via the casting compound, which also prevents the risk of unwanted cracking and the formation of electrical creepage distances or at least reduced.
- the object of the invention is also achieved by a method for producing a stator for an electric machine within a drive train of a motor vehicle, comprising the following steps: Provision of a stator, wherein the stator is in the form of a cylindrical ring and a winding overhang of a hairpin winding extends axially out of the stator on at least one axial end face,
- an insulating ring in particular an insulating ring according to one of claims 1 -4, wherein the insulating ring has an annular disk-shaped base body with a plurality of openings extending axially through the base body, as well as a spacer element extending out of the base body at least in a first axial direction and at least one retaining element extending out of the base body in a second axial direction,
- the method according to the invention can also be implemented in an advantageous manner such that the fixing of the casting tool relative to the at least one retaining element of the insulating ring takes place in the axial and circumferential direction before the insulating ring is placed on the end winding of the hairpin winding, so that the insulating ring is Potting tool is placed on the end winding.
- FIG. 2 shows a perspective representation of a stator with an insulation ring placed on the end winding of a hairpin winding
- FIG. 3 a detailed view of the insulation ring placed on the end winding of the hairpin winding in a perspective representation
- FIG. 4 shows a perspective representation of a stator with an insulation ring placed and cast on the end winding of a hairpin winding
- FIG. 5 shows a hybrid and a motor vehicle that can be operated fully electrically in a schematic block diagram.
- FIG. 1 shows an insulating ring 1 for a winding overhang 2 of a hairpin winding 3 of a stator 4 of an electrical machine 5, such as is used within a drive train 15 of a motor vehicle 16, which is sketched in FIG. 5 as an example
- the insulating ring 1 has an annular disc-shaped base body 6 with a plurality of openings 7 extending axially through the base body 6, through which the free ends 8 of a pair of hairpin conductor bars 9 can reach at least in sections, which can be clearly seen from the combination with Figure 3 reveals.
- Three spacer elements 10 extend out of the base body 6 in a first axial direction and three holding elements 12 in a second axial direction.
- the spacer elements 10 and the holding elements 12 are equidistant along the Circumference of the insulating ring 1 arranged.
- the spacer elements 10 and the holding elements 12 each form pairs 13 associated with one another, which are each positioned in a common circumferential segment 14 of the insulating ring 1 .
- the insulating ring 1 is formed in one piece from a plastic by means of an injection molding process.
- the openings 7 of the insulating ring 1 are arranged along concentric diameters in the annular disk-shaped base body 6 .
- the openings 7 are each positioned equidistantly from one another on a diameter. 1 also clearly shows that the openings 7 are positioned on the concentric diameters in circumferentially distributed groups of radially aligned openings 7, the radially aligned openings 7 of a group also being spaced equidistantly from one another.
- the openings 7 are essentially identically rectangular in shape with rounded corners, with their longitudinal extension being oriented in the circumferential direction of the insulating ring 1 .
- the design of the openings 7 is selected such that the hairpin conductor bar pairs 9 accommodated in an opening 7 ideally do not contact the opening 7, so that between the hairpin conductor bar pairs 9 and the openings 7, potting compound 18 can ensure complete insulation.
- the insulating ring 1 has no contact with the end winding 2 .
- the spacer elements 10 and the holding elements 12 are formed monolithically with the base body 6 .
- the three spacer elements 10 are designed as webs, which are arranged on the radially outer diameter of the annular disk-like base body. These spacer elements 10 extend in a trapezoidal manner in the axial direction, with the long trapezoidal side facing the base body 6 and the short trapezoidal side facing the stator 4 .
- the three spacer elements 10 are formed in the same part.
- the three holding elements 12 are also designed as webs, but have a cylindrical configuration and are arranged on the radially outer diameter of the annular disk-like base body 6 .
- the three holding elements 12 are formed in the same part.
- the underside of the base body 6 can have a slight slope so that no gas bubbles get stuck on or in the base body 6 when the casting compound 18 is poured in from below.
- FIG. 2 shows a stator 4 for an electric machine 5, such as is used within a drive train 15 of a motor vehicle 16, for example.
- the stator 4 is designed in the shape of a cylindrical ring and a winding overhang 2 of a hairpin winding 3 extends axially out of the stator 4 on at least one axial end face 17 .
- the hairpin winding 3 can be connected via the HV terminal 20 to power electronics for energizing the hairpin winding 3 . This connection is made via HV connection pins 21 of the hairpin winding 3 that protrude axially out of the end winding 2, as is also shown in FIG.
- FIG. 2 thus shows the stator 4 with the insulation ring 1 placed on the end winding 2 .
- These openings 7 of the insulating ring 1 are filled with a preferably electrically insulating casting compound 18, which is shown in FIG.
- the insulating ring 1 rests against the axial end face 17 of the stator 4 via the three spacer elements 10 extending axially out of the base body 6 of the insulating ring 1 , without torques being able to be transmitted between the insulating ring 1 and the stator 4 . There is therefore no circumferential positioning, no snapping or any other position securing between the insulating ring 1 and the stator 4 in the circumferential direction.
- the insulating ring 1 is thus fixed in the circumferential direction, in the radial direction and in an axial direction relative to the hairpin winding 3 only via the casting compound 13 . It can also be seen from FIG.
- the twist side and the HV terminating terminal 20 side of the hairpin winding 3 are in the same end winding 2 .
- the hairpins are twisted differently than in the rest of the winding head 2, which prevents additional possible creepage distances between the terminal pins and the welded hairpins
- some of the openings 7 can also be completely or partially covered by a cover element 11 .
- the cover element 11 is designed in one piece with the insulating ring 1 or as a separate component that is fixed to the insulating ring 1 .
- the creepage distances between the conductors of the winding overhang 2 can be lengthened by a cover element 11, as a result of which security against undesired local short circuits in the winding overhang 2 can be increased.
- FIGS. 2 and 4 A possible method for producing a stator 4, as is known from FIGS. 2 and 4, is explained in more detail below.
- a stator 4 is provided, the stator 4 being in the form of a cylindrical ring and a winding overhang 2 of a hairpin winding 3 extending axially out of the stator 4 on at least one axial end face 17 .
- an insulating ring 1 is provided, as is known from FIG spacer element 10 extending out of the base body 6 and at least one retaining element 12 extending out of the base body 6 in a second axial direction.
- the insulating ring 1 is then fixed relative to a casting tool by means of the three holding elements 12 of the insulating ring 1 in the axial and circumferential direction.
- the insulation ring 1, which is fixed relative to the casting tool is then placed by the casting tool on the end winding 2 of the hairpin winding 3, so that the openings 7 are penetrated at least in sections by the free ends 8 of a hairpin conductor bar pair 9, and the insulation ring 1 via the at least one spacer element 10 extending axially out of the base body 6 of the insulating ring 1 bears against the axial end face 17 of the stator 4 without torques being able to be transmitted between the insulating ring 1 and the stator 4 .
- This assembly state of the stator 4 is shown in FIG. 2, but without the casting tool.
- the openings 7 are then filled with a casting compound 18 using the casting tool. Finally, the casting tool is removed from the holding elements 12 and the result is the manufacturing state of the stator 4 shown in Figure 4.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022104442.4A DE102022104442A1 (de) | 2022-02-24 | 2022-02-24 | Isolationsring, Stator und Verfahren zur Herstellung eines Stators |
| PCT/DE2022/100957 WO2023160739A1 (de) | 2022-02-24 | 2022-12-15 | Isolationsring, stator und verfahren zur herstellung eines stators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4483475A1 true EP4483475A1 (de) | 2025-01-01 |
Family
ID=84943895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22843112.8A Withdrawn EP4483475A1 (de) | 2022-02-24 | 2022-12-15 | Isolationsring, stator und verfahren zur herstellung eines stators |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250183746A1 (de) |
| EP (1) | EP4483475A1 (de) |
| CN (1) | CN118830171A (de) |
| DE (1) | DE102022104442A1 (de) |
| WO (1) | WO2023160739A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024112537A1 (de) | 2024-05-03 | 2025-11-06 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Statoranordnung und Verfahren zur Herstellung |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3921859B2 (ja) | 1999-01-18 | 2007-05-30 | 株式会社デンソー | 接合部の絶縁構造、回転電機の絶縁構造およびその製造方法 |
| ITBO20150189A1 (it) | 2015-04-16 | 2016-10-16 | Magneti Marelli Spa | Metodo di costruzione di una macchina elettrica presentante un avvolgimento statorico con barre rigide |
| DE102016214031A1 (de) * | 2016-07-29 | 2018-02-01 | Volkswagen Aktiengesellschaft | Elektromotor sowie ein Verfahren zur Herstellung eines Stators für einen Elektromotor |
| AT521060A1 (de) * | 2018-03-27 | 2019-10-15 | Miba Ag | Stator |
| DE102019207666A1 (de) | 2018-09-26 | 2020-03-26 | Zf Friedrichshafen Ag | Stator einer elektrischen Maschine mit einem Temperatursensor |
| DE102019134792A1 (de) * | 2019-12-17 | 2021-06-17 | Valeo Siemens Eautomotive Germany Gmbh | Isolationsvorrichtung, Statorvorrichtung, elektrische Maschine und Verfahren zur Herstellung einer Statorvorrichtung |
| DE102020118224A1 (de) | 2020-06-30 | 2021-12-30 | Schaeffler Technologies AG & Co. KG | Stator |
-
2022
- 2022-02-24 DE DE102022104442.4A patent/DE102022104442A1/de not_active Withdrawn
- 2022-12-15 US US18/839,725 patent/US20250183746A1/en active Pending
- 2022-12-15 EP EP22843112.8A patent/EP4483475A1/de not_active Withdrawn
- 2022-12-15 CN CN202280091571.3A patent/CN118830171A/zh active Pending
- 2022-12-15 WO PCT/DE2022/100957 patent/WO2023160739A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN118830171A (zh) | 2024-10-22 |
| WO2023160739A1 (de) | 2023-08-31 |
| US20250183746A1 (en) | 2025-06-05 |
| DE102022104442A1 (de) | 2023-08-24 |
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