EP4309265A1 - Rotor de machine électrique tournante - Google Patents
Rotor de machine électrique tournanteInfo
- Publication number
- EP4309265A1 EP4309265A1 EP22714191.8A EP22714191A EP4309265A1 EP 4309265 A1 EP4309265 A1 EP 4309265A1 EP 22714191 A EP22714191 A EP 22714191A EP 4309265 A1 EP4309265 A1 EP 4309265A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- claws
- axis
- rotation
- 0dibg
- 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.)
- Pending
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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/243—Rotor cores with salient poles ; Variable reluctance rotors of the claw-pole type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to a rotor of a rotating electrical machine, in particular for an alternator or an alternator-starter.
- the invention finds particularly advantageous but not exclusive applications in the field of rotating electric machines for hybrid vehicles, in particular automobiles and, in particular, in the field of high-power reversible electric machines capable of operating in alternator mode and in motor mode coupled with a gearbox.
- rotating electrical machines comprise a stator and rotor secured to a shaft.
- the rotor may be integral with a driving and/or driven shaft and may belong to a rotating electrical machine in the form of an alternator, an electric motor, or a reversible machine that can operate in both modes.
- a high-power reversible rotating electrical machine is coupled to the vehicle gearbox or to a train of the motor vehicle.
- the electric machine is then able to operate in an alternator mode in particular to supply energy to the battery and/or to the on-board network of the vehicle, and in a motor mode, not only to ensure the starting of the combustion engine, but also to participate in the traction of the vehicle alone or in combination with the internal combustion engine.
- the stator comprises a body made up of a stack of thin laminations forming a crown, the inner face of which is provided with slots open inwards to receive the phase windings. These windings pass through the slots in the stator body and form buns protruding from either side of the stator body.
- the phase windings are obtained for example from a continuous wire covered with enamel or from conductive elements in the form of pins connected together by welding.
- the rotor comprises two pole wheels each comprising a flange and at its outer periphery claws directed axially in the direction of the flange of the other pole wheel.
- the claws of the pole wheels are nested with respect to each other.
- a core is interposed axially between the flanges of the pole wheels.
- This core carries at its outer periphery an excitation winding comprising a plurality of turns formed around an insulator inserted radially between the core and the winding.
- Assemblies of this type are known from the prior art and are very widely used in motor vehicle alternators. A constant objective in this field is to reduce the temperature of the rotor during its operation.
- the invention thus aims to provide a rotating electrical machine rotor with improved cooling.
- the present invention aims to improve the existing device by proposing a rotating electrical machine rotor, in particular for an alternator or an alternator-starter of a motor vehicle, rotatably mounted around an axis of rotation and comprising:
- an excitation winding comprising a plurality of turns mounted on a cylindrical core and fitted with an insulator, in which:
- said rotor has first and second recesses so as to reveal axially at least one turn, preferably at least two, of the excitation winding,
- an axial flow of air in the direction of the excitation winding makes it possible to reduce the temperature of the rotor without modifying the rotor/stator air gap in comparison with a rotor of the prior art which does not have such a ratio. .
- the rotor has at least one completely empty space between at least one turn of the winding and an axial end face of the pole wheel facing this turn.
- the terms "external” and “internal” as well as the “axial” and “radial” orientations will be used to designate, according to the definitions given in the description, elements of the rotor, of the stator and/or of the electric machine.
- the "radial” orientation is directed orthogonally to the axial orientation.
- the axial orientation refers, depending on the context, to the axis of rotation of the rotor, the stator and/or the electrical machine.
- the "circumferential" orientation is directed orthogonally to the axial direction and orthogonal to the radial direction.
- the recesses reveal axially between two and six turns of the excitation winding. Even more preferably, the recesses reveal axially between two and four turns of the excitation winding.
- the first recesses are formed on at least one pole wheel.
- the first recesses can be formed on the front pole wheel, the rear pole wheel or the two pole wheels.
- the second recesses are formed on the insulation of the excitation winding.
- the ratio R is less than 90%, preferably 88% and greater than or equal to 85%.
- the inter-claw space has a first and a second surface of generally triangular shape, of which: - the base is tangent to the cylinder coaxial with the axis of rotation defining the external diameter of the rotor for the first surface and tangent to the cylinder coaxial with the axis of rotation defining the internal diameter of the claws for the second surface,
- the sides are defined by two successive claws of the same pole wheel, in particular by two side faces facing each other of two claws, and - the top is defined by the tangent to the cylinder coaxial with the axis of rotation defining the internal diameter 0ig, wherein the ratio between the second and the first surface is greater than 15%, preferably greater than 17%.
- the rotor comprises 8 pairs of poles.
- the rotor can comprise 6 or 7 pairs of poles.
- the invention also relates to a rotating electrical machine equipped with a rotor as described above.
- the rotating electrical machine consists of an alternator, an alternator-starter, a reversible machine or an electric motor.
- FIG. 1 shows a perspective view of a rotor according to the present invention.
- FIG. 2 shows a front view of the rotor according to the present invention illustrating the first and second recesses revealing axially at least one turn of the excitation winding.
- FIG. 3 shows a longitudinal sectional view of the rotor of figure 1.
- FIG. 4 shows a front view of a pole wheel of the rotor according to the present invention illustrating the internal diameter of the inter-claw space (0ig), the external diameter of the rotor (0od) and the internal diameter of the claws (0Dibg) .
- FIG. 5 shows a partial longitudinal sectional view of the pole wheel of Figure 3.
- FIG. 6 represents the areas S1 and S2 on a partial front view of the pole wheel of figure 4.
- FIG. 1 represents a rotor 1 of a rotating electric machine for an alternator, an alternator-starter, a reversible machine or an electric motor rotatably mounted around an axis of rotation X-X'.
- the rotor 1 is force-fitted onto a shaft 2 extending along the axis X-X', and secured thereto in rotation around the axis X-X' by splines carried by this shaft 2, these splines cooperating with grooves provided in the rotor 1.
- the rotor 1 is a claw rotor comprising two pole wheels 8a, 8b.
- Each pole wheel 8a, 8b comprises, as can be seen in FIG. 3, a cylindrical half-core 34 which carries at its outer periphery an excitation winding 10 comprising a plurality of turns 11.
- This winding 10 is insulated from the core 34 by a insulation 20 interposed radially between these elements.
- the insulator is made of electrically insulating material, advantageously of plastic material.
- Each pole wheel 8a, 8b also comprises a disk flange 18 centered on the axis X-X', and substantially perpendicular to this axis and claws 9a, 9b directed axially in the direction of the flange 18 of the other pole wheel 8a, 8b.
- the flange is pierced by a central bore receiving the shaft 2.
- substantially radial means a direction forming an angle of between 80 and 100° with respect to the axis X -X'.
- a core is made up of half-cores 34, each half-core being integral with one of the two pole wheels 8a, 8b.
- the half-core 34 has a smaller outer diameter than the flange 18 and extends from a large axial face of the latter facing the opposite pole wheel.
- the two half-cores 34 are placed axially in the extension of one another.
- the core is pierced with a bore which receives the shaft 2.
- the two half-cores 34 can be a single piece, and be independent of the pole wheels 8a, 8b.
- the insulator 20 comprises a bottom 31 radially enveloping the core 34 and interposed between the winding 10 and the core 34, and two crowns 32 substantially perpendicular to the axis XX.
- the bottom 31 is itself cylindrical and coaxial with the axis of rotation X-X'.
- Rings 32 are integral with two opposite axial ends of the bottom and project radially outwards from these ends. These rings 32 are interposed axially on either side of the excitation winding 10, between the latter and the flanges 18 of the two pole wheels 8a, 8b.
- Each crown 32 comprises petals (not visible in the figures) regularly spaced along a radially outer edge of this crown and folded axially between the winding 10 and the claws 9a, 9b.
- the rotor 1 has first and second recesses 13, 14 so as to reveal axially at least one turn 11 of the excitation winding 10 as can be seen in particular in Figure 2.
- the pole wheels 8a, 8b do not extend radially outside or beyond the entire periphery of the winding 10.
- the winding 10 therefore has at least a part of an axial end not facing screw or a pole wheel 8a, 8b or insulation 20. This part is therefore composed of the turns 11 of the winding 10 which can be seen axially.
- the rotor 1 has at least one empty space from any part between at least one turn 11 of the coil 10 and an axial end face of the pole wheel 8a, 8b facing this turn.
- insulator 20 in particular the crowns 32, are of the mesh type and extend radially at least at the same height as the turn 11 located radially on the outside while revealing axially at least one turn 11.
- At least one pole wheel 8a, 8b and the insulator 20 are shaped to reveal axially at least one turn 11.
- the structure and/or the shape of at least one pole wheel 8a, 8b and/or insulation 20 are defined so as to reveal axially at least one turn 11 .
- the first recesses 13 are formed on at least one pole wheel 8a, 8b.
- the second recesses 14 are formed on the insulator 20 of the excitation winding 10, in particular on a crown 32.
- the claws 9a, 9b also called teeth, have a trapezoidal shape.
- the claws 9a, 9b of the same pole wheel 8a, 8b are secured to the flange 18 by respective bases 19 projecting radially from an outer edge of the flange 18 and extend axially from the bases 19.
- poles 8a, 8b are angularly offset relative to each other so that each claw 9a, 9b of a pole wheel 8a, 8b is interposed between two adjacent claws of the other pole wheel 8a, 8b.
- the claws 9a, 9b of the same pole wheel are mutually separated by inter-claw spaces 15 of inside diameter 0ig.
- the diameter 0ig is also used to define the outer periphery of the flange 18.
- the diameter 0ig defines the inner diameter of each inter-claw space 15 as well as the outer diameter of the flange 18.
- we meet therefore alternately an inter-claw space 15 and a base 19.
- the inter-claw spaces 15 are therefore delimited by two successive claws of a pole wheel, in particular the two side faces facing one of the other of two successive claws 9a or 9b respectively belonging to one and the other pole wheel 8a, 8b.
- each inter-claw space 15 is delimited by an arcuate bottom at the level of the periphery of the flange 18, by the two full lateral sides of the bases 19 framing space 15, and by a radially outer open side.
- the inter-claw spaces 15 form the first recesses 13.
- the claws 9a, 9b have radially outer faces 38 falling within a cylinder coaxial with the axis of rotation X-X' and defining the outer diameter of the rotor 0od.
- These faces 138 considered in planes perpendicular to the axis of rotation X-X', have respective widths which taper from the base 19 towards the opposite pole wheel.
- the claws 9a, 9b also have radially inner faces 39, the slopes of which form with the respective bases 19 points of intersection ibg falling within a cylinder coaxial with the axis of rotation X-X' and defining the inner diameter of the claws 0Dibg.
- a rotor according to the present invention R1
- RF reference rotor
- the ratio R is greater than or equal to 85%. In fact, beyond this ratio, the overhang of the holding of the claws would become too great.
- the inter-claw space 15 has a first and a second surface of generally triangular shape S1, S2 including:
- the base is tangent to the cylinder coaxial with the axis of rotation X-X' defining the external diameter of the rotor 0od for the first surface S1 and tangent to the cylinder coaxial with the axis of rotation X-X' defining the internal diameter of the 0Dibg claws for the second surface S2,
- the sides are defined by two successive claws 9a, 9b of the same pole wheel 8a, 8b, in particular by two side faces facing each other of two claws 9a, 9b, and - the vertex is defined by the tangent to the cylinder coaxial with the axis of rotation X-X' defining the internal diameter 0ig.
- Rotor R1 has an S2/S1 ratio of 17.75%.
- each claw 9a, 9b is configured for mounting pole magnets 40.
- each claw 9a, 9b comprises two grooves having a U-shaped profile and made in a side face of a claw.
- the grooves are grooves for receiving the permanent magnets 40, which are for example of the rare-earth or ferrite type.
- the choice of the type of magnet depends on the desired power of the electrical machine comprising the rotor 1.
- the magnets can be made by molding, in particular by sintering.
- the magnets 40 are parts made of a magnetic elasto-ferrite material.
- the permanent magnets 40 here are generally parallelepipedic in shape and are mounted in the grooves, being dimensioned according to the grooves in order to penetrate into them.
- the rotor 1 can comprise two fans each plated and welded on an axial face of the flange 18 of one of the pole wheels 8a, 8b, said face being turned in a direction opposite to the other wheel. The fans make it possible to create an air flow inside the rotor 1 for its cooling.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2102778A FR3120999B1 (fr) | 2021-03-19 | 2021-03-19 | Rotor de machine électrique tournante |
| PCT/EP2022/056461 WO2022194740A1 (fr) | 2021-03-19 | 2022-03-14 | Rotor de machine électrique tournante |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4309265A1 true EP4309265A1 (fr) | 2024-01-24 |
Family
ID=75539636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22714191.8A Pending EP4309265A1 (fr) | 2021-03-19 | 2022-03-14 | Rotor de machine électrique tournante |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4309265A1 (fr) |
| CN (1) | CN116998089A (fr) |
| FR (1) | FR3120999B1 (fr) |
| WO (1) | WO2022194740A1 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130097663A (ko) * | 2012-02-24 | 2013-09-03 | 레미 테크놀러지스 엘엘씨 | 교류기 비율 |
| FR3036236B1 (fr) * | 2015-05-15 | 2019-11-01 | Denso Corporation | Machine electrique rotative pour vehicules |
| JP6656338B1 (ja) * | 2018-10-29 | 2020-03-04 | 三菱電機株式会社 | 回転電機の回転子の製造方法 |
-
2021
- 2021-03-19 FR FR2102778A patent/FR3120999B1/fr active Active
-
2022
- 2022-03-14 EP EP22714191.8A patent/EP4309265A1/fr active Pending
- 2022-03-14 WO PCT/EP2022/056461 patent/WO2022194740A1/fr not_active Ceased
- 2022-03-14 CN CN202280022328.6A patent/CN116998089A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3120999B1 (fr) | 2023-12-08 |
| CN116998089A (zh) | 2023-11-03 |
| WO2022194740A1 (fr) | 2022-09-22 |
| FR3120999A1 (fr) | 2022-09-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
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| 17P | Request for examination filed |
Effective date: 20230912 |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VALEO ELECTRIFICATION |