EP4360191A1 - Corps de stator et methode d'assemblage d'un tel corps de stator - Google Patents
Corps de stator et methode d'assemblage d'un tel corps de statorInfo
- Publication number
- EP4360191A1 EP4360191A1 EP22741166.7A EP22741166A EP4360191A1 EP 4360191 A1 EP4360191 A1 EP 4360191A1 EP 22741166 A EP22741166 A EP 22741166A EP 4360191 A1 EP4360191 A1 EP 4360191A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- key
- groove
- tooth
- stator body
- fixing support
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/182—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to stators axially facing the rotor, i.e. with axial or conical air gap
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- 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
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/021—Magnetic cores
- H02K15/022—Magnetic cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
Definitions
- the present invention generally relates to the field of electrical machines.
- stator body for an electric machine comprising:
- Fixing means each adapted to fix one of said teeth on the fixing support.
- the invention finds a particularly advantageous application in an electric machine with axial flux, although it also applies to electric machines with radial flux.
- An electric or hybrid motor vehicle comprises a powertrain which comprises an electric machine.
- the electric machine comprises a rotor which is mounted on an output shaft, which is connected to the driving wheels of the vehicle.
- the electrical machine may be of the axial flux type and comprise a casing in two parts, which houses a disc-shaped rotor flanked by two stators. The stators are then slightly spaced on either side of the rotor to avoid any friction when the rotor turns. Thus, on each side of the rotor is a space called "air gap".
- the performance of the electric machine depends on the value of these air gaps (it must be minimal), on their constants all around the axis of rotation of the rotor, and on the symmetry of these air gaps on either side of the rotor.
- the slightest error in geometry has consequences on the performance of the engine and on its life. For example, it is understood that a difference in values between the two air gaps causes an attraction of the rotor by the closest stator. This effort can be significant. It can also be cyclical and lead to fatigue of the materials making up the electrical machine.
- the present invention proposes fixing the teeth by means of wedges.
- each fixing means comprises:
- At least one blocking element adapted to block the first key relative to the second key.
- the mounting bracket has a flat area in which the grooves are located, and a rim which rises around the flat area, it is possible to engage the keys by taking advantage of the reduced space between the edge and the teeth, thanks to the reduced length of the keys used.
- each key is housed in one of the two grooves only.
- the first key does not extend into the second keyway, and vice versa.
- each first and second groove has a bottom and two side walls inclined towards each other which together delimit an elongated orifice of less width than the bottom, the orifice of the first groove being superimposed on the orifice of the second groove;
- each blocking element is accessible from the side of the tooth
- Two separate second keys are provided, housed in the same second groove or in two second coaxial grooves;
- the blocking element is adapted to exert a tensile force from the first key to the second key
- the blocking element comprises a plastically deformable part which has just been formed with the second key
- the first key defines a passage for the plastically deformable part, on the edge of which the plastically deformable part is adapted to be crimped;
- the second groove is extended by an insertion ramp whose cross-section gradually widens from the second groove;
- the fixing support forms part of a casing of a stator
- each fixing means also comprises a relief which extends projecting or recessed from the fixing support and from which the tooth tears off.
- the invention also relates to an electric machine comprising a rotor and two stator bodies as mentioned above, located on either side of the rotor.
- the implementation step can be implemented before or after the engagement step.
- the blocking step is implemented by crimping the blocking element.
- FIG. 1 is a schematic sectional view of an electrical machine according to the invention.
- FIG. 1 is a schematic view of a tooth and part of a mounting bracket according to a first embodiment of the electric machine of Figure 1, before assembly and installation of the tooth key and after installing the mounting bracket keys;
- FIG. 3 is a schematic view of the tooth and the part of the mounting bracket of Figure 2, before assembly and after installation of the keys of the tooth and the mounting bracket;
- FIG. 4 is a schematic view of a detail illustrating the keys of the tooth and the fixing support before crimping
- FIG. 5 is a schematic perspective view of the head of a tool for crimping the keys of the tooth and the fixing support;
- - Figure 6 is a schematic sectional view along the plane A-A of Figure 5;
- - Figure 7 is a schematic perspective view of the keys of the tooth and the fixing support once crimped;
- FIG. 8 is a schematic view of a tooth and part of a mounting bracket according to a second embodiment of the electric machine of Figure 1, before assembly, on which the tooth has been represented transparently;
- Figure 9 is a schematic view of the tooth and the part of the mounting bracket of Figure 8, during assembly, on which the tooth has been shown transparently.
- FIG 1 there is shown an electric machine of a powertrain which can in particular be installed in a motor vehicle with electric or hybrid propulsion.
- the electric machine 10 could be of the radial flux type. However, preferably, it is of the axial flow type. It therefore comprises at least one rotor 200 and at least one stator.
- This electric machine 10 comprises a hollow casing 102 in two parts bolted to each other, hereinafter called half-casings 102A, 102B, which delimits a housing 103 inside which the rotor 200 is located. .
- the rotor 200 here has the shape of a disc pierced in its center. It comprises a star-shaped central hub 210 and a peripheral hoop 230 which hold between them magnets 220 (one-piece or formed from a plurality of unitary magnets) regularly distributed around an axis of rotation A1.
- the central hub 210 and hoop 230 are made of non-magnetic materials, for example composite material.
- the collar makes it possible, when the rotor turns, to take up the centrifugation forces of the magnets 220 in order to preserve the cohesion of the rotor 200 at high speed.
- the central hub 210 is bolted to an output shaft 300 which extends axially along the axis of rotation A1 and which is connected to the drive wheels of the motor vehicle.
- the stators 100A, 100B are placed on either side of the rotor 200 and they are designed so that the electric machine 10 has the smallest possible size.
- teeth 120 which are fixed on a fixing support so as to be evenly distributed around the axis of rotation A1, and coils 130 of electric wires mounted on the teeth 120 and connected to a power supply. so as to be able to rotate the rotor 200.
- the coils 130 of electric wires here comprise a bobbin 131 around which the electric wire is wound, which protects the electric wire.
- the mounting brackets on which the teeth 120 are fixed are designed to be fixed in the housing 102.
- these mounting brackets are formed by the two half-housings 102A, 102B, which makes it possible to reduce the number of components and the size of the electric machine 10.
- the teeth are they are directly attached to the casing 102.
- Each half-casing 102A, 102B then forms, with the teeth 120 that it supports, a “stator body 101 A, 101 B”.
- Each stator body 101A, 101B further forms, with the coils 130 of electric wires, a “stator 100A, 100B”.
- the casing is made of a metallic material and that the teeth are formed from a superposition of assembled metal sheets.
- each half-casing 102A, 102B has a substantially flat and circular bottom 104A, 104B, which is pierced in its center by a passage opening for the output shaft 300 (see also the figure 2).
- a passage opening for the output shaft 300 see also the figure 2.
- only one of these half-casings could be pierced with such an opening, the other being completely closed.
- Each bottom 104A, 104B is internally bordered, along this passage opening, by an inner collar 105A, 105B shaped to receive, on its cylindrical internal face, a ball bearing 310 in which the drive shaft is mounted. outlet 300.
- Each bottom 104A, 104B is also bordered along its periphery, by a peripheral rim 106A, 106B which rises up to the peripheral periphery of the other half-casing 102A, 102B, so as to hermetically closing the chamber 103.
- each tooth 120 has a base 121 in the form of a thick isosceles trapezium, a body 122 also in the form of a thicker isosceles trapezium, of the same height but narrower than the trapezium formed by the base 121, and finally a head 123 which gradually widens on either side of the body 122.
- Each tooth 120 thus delimits, on either side of its body 122, a groove around which the winding 130 of electric wire can be placed so that the latter is retained on one side by the base 121 and on the other through the head 123.
- the teeth 120 are shaped so that the distance separating them from the rotor 200, called air gap, is as small as possible.
- the invention relates more precisely then to the means which make it possible to fix the teeth 120 on each half-casing 102A, 102B.
- These fixing means are here designed to be rigid so that the air gap does not vary.
- this fixing then takes place by means of several keys.
- the fixing means used to fix each tooth on each part of the housing 102 are all identical. Consequently, in the rest of this presentation, we will focus exclusively on the fixing of any one of the teeth 120 on any one of the half-casings 102A. These two elements are shown in Figure 2.
- the base 121 of the tooth 120 has, recessed in its face in contact with the bottom 104A of the half-casing 102A, a groove 124.
- This groove 124 extends in length along an axis which is radial with respect to the axis of rotation A1 (that is to say perpendicular to the latter), and which is hereinafter called radial axis A2.
- the groove 124 is profiled along this radial axis A2, that is to say that any cross section of this groove (in planes orthogonal to the radial axis A2) has the same shape.
- this cross section is generally trapezoidal isosceles.
- the base of this trapezium is located on the side of the head 123 of the tooth 120 while its top opens on the side of the half-casing 102A.
- the groove 124 has a flat bottom 125 and two side walls 126 inclined towards each other so that it opens downwards through a rectangular orifice whose width is less than that of the bottom. 125.
- edges located on either side of the bottom 125 of the groove 124 are rounded.
- the half-casing 102A has, recessed in its face in contact with the tooth 120, a groove 111 A.
- This groove 111 A extends in length along an axis parallel to the radial axis A2. It is profiled along this radial axis A2.
- the shape of its cross section is identical or close to that of the groove 124 provided in the tooth 120, with a bottom 112A and two side edges 114A. Here, it has a slightly smaller size than that of groove 124.
- Its orifice on the other hand, has a width identical to that of the orifice of groove 124.
- the two grooves 111A, 124 overlap exactly by their holes.
- the cross section of this “superposition of grooves” has a “bow tie” shape (see FIG. 6), arranged to receive the keys 140, 150.
- This superposition of grooves 111 A, 124 therefore has a width variable, which is maximum at its high and low ends and minimum at the height of the orifices.
- the keys 140, 150 have the shape of prisms whose bases are trapezoids. Their shapes will be described in more detail below.
- the key 140 to be installed in the groove 124 of the tooth can be engaged there easily, before the tooth 120 is attached to the half-casing 102A, the same does not apply to the keys 150 to engage in the groove 111A of the half-casing 102A. Indeed, the peripheral rim 106A and the inner flange 105 are potentially troublesome.
- half-keys 150 there is provided here a single key 140 in the tooth 120 (hereinafter called long key 140) and several keys 150, preferably two, in the groove 111 A half-casing 102A (hereinafter referred to as half-keys 150).
- the groove 111A In practice, provision is made for the groove 111A to extend on either side of the tooth 120, by an insertion ramp 113A.
- These insertion ramps 113A are here provided in such a way that it is possible to engage the half-keys 150 therein from above (in the direction F1 parallel to the axis of rotation A1), before there slide these half-keys to the inside of the groove 111 A (in the direction F2 parallel to the radial axis A2).
- Each insertion ramp 113A then extends in length along the radial axis A2 but it has a cross section which is not uniform. It thus has, on the side of its end remote from the tooth 120, a section of rectangular shape which allows it to receive the half-key 150 in the direction F1. Then it has a section which becomes progressively trapezoidal towards its opposite end until it has a shape identical to that of the groove 111 A, so that the half-key 150 does not abut against any interference when it is slides in the direction F2.
- the insertion ramp 113A has a bottom of the same width as the bottom of the groove 111A, and two sides which gradually rise from the groove 111A towards its opposite end, from one angle of approximately 50 degrees up to an angle of approximately 90 degrees.
- two ramps are therefore provided so as to be able to engage the two half-keys 150 in the groove 111A when the tooth 120 is already in place on the half-casing 102A.
- a single ramp could have been provided, in which case at least one of the two half-keys 150 must be installed in the groove 111A before the tooth 120 is placed on the half-casing 102A.
- the long key 140 has the shape of an elongated bar along the radial axis A2. It thus has flat, rectangular and parallel upper faces (turned on the tooth side) and lower faces (turned on the half-casing side). It also has two flat side faces but inclined relative to each other with an angle of inclination identical to the angle provided between the side walls 126 of the groove 124 for receiving this long key. As clearly shown in Figures 5 to 7, the upper edges of this long key 140 are rounded chamfered.
- This long key 140 is profiled, that is to say it has a uniform section along the radial axis A2.
- the half-keys 150 have identical shapes, so that only one of the two can be described.
- this half-key 150 comprises a body 159 which has the shape of an elongated bar along an axis parallel to the radial axis A2.
- This body thus has flat, rectangular and parallel upper faces (turned on the tooth side) and lower faces (turned on the half-casing side). It also has two flat side faces but inclined with respect to each other with an angle of inclination identical to the angle provided between the side walls of the slot 111 A for receiving this half-key.
- the lower edges of this half-key 150 are rounded chamfered.
- This half-key 150 is profiled, that is to say its body has a uniform section along the radial axis A2.
- Means 151 are then provided to block each half-key 150 in a fixed position relative to the long key 140.
- these means are formed with the body of the half-key 150. [0097] As shown in Figures 4, 6 and 7, these are crimping means.
- these means comprise a cylindrical pin 154 which rises from the upper face of the body of the half-key 150, orthogonally thereto.
- They also comprise a cylindrical rod 152 which rises from the upper end of the cylindrical pin 154, in the axis of the latter, and which has a diameter smaller than the diameter of this pin.
- This rod 152 has an upper end which has an enlargement in section forming a gripping socket 155.
- the half-keys are here made of a metallic material.
- This crown 153 is then provided to be engaged in one of the notches 143 (see FIGS. 5 and 7) of the long key 140 and to be crimped above the latter in order to form a bulge which blocks the keys relative to each other. This crimping operation thus makes it possible to pull the keys towards each other.
- This head 400 comprises two parts 410, 420 movable in translation relative to each other, one of which is adapted to cling to the gripping socket 155 of the rod 152 and the other which is adapted to push back, like a press, the crown 153 so as to form the aforementioned bead.
- the long key 140 is engaged in the groove 124 of one of the teeth 120, by sliding it until its two ends overflow either side of tooth 120.
- the half-keys 150 are positioned in the insertion ramps 113A of one of the grooves 111 A of the half-casing 102A, then they are pushed towards each other. in order to enter this groove 111 A.
- the tooth 120 is positioned against the bottom 104A of the half-casing 102A, so that the groove 124 provided in this tooth 120 is superimposed above the groove 111 A.
- the positions of the half-keys 150 are adjusted so that the crowns 153 of the half-keys 150 are placed in the notches 143 of the long key 140.
- the body of the half-key 150 is not in contact with the long key 140, but there is play between these two elements.
- the present invention is in no way limited to the embodiment described and shown, but those skilled in the art will know how to make any variant in accordance with the invention. .
- the invention could be applied to a radial flux electric machine, in which case the tooth fixing support could be formed by the peripheral rim of the half-casing.
- the tooth fixing support could be formed by the peripheral rim of the half-casing.
- one could have provided a fixing support for the teeth which is separate from the casing, and which then comprises grooves for receiving the half-keys and means for fixing to the casing.
- the locking means 151 are replaced by rivets, the tool 400 then serving to rivet these rivets on the long key 140.
- FIGS. 8 and 9 a second embodiment of the invention.
- the tooth 120 is provided to be retained on one side by a half-key and by a long half-key (not shown).
- the tooth is provided to be retained on the other side (here the outer side) by a relief 160 which has just been formed with the bottom 104A of the half-casing 102 and which has a shape identical to that of a section of the long key 140.
- this relief 160 has a cross section in the shape of a dovetail.
- the method for assembling the stator body is slightly different from that described above.
- the tooth 120 equipped with its long key half 140 (not shown in the figures) is positioned on the half-casing 102A.
- the tooth 120 is first placed against this half-casing, by a first longitudinal movement (arrow F1) so that one of the ends of its groove 124 opens opposite the relief 160. It is then moved radially by a second movement (arrow F2 in Figure 9) to engage the groove 124 of the tooth 120 on this relief 160.
- the tooth 120 is fixed on the inside using a half-key 150 crimped on the long half-key, in the same way as in the first embodiment.
- the relief 160 could have a different shape, provided that it allows the tooth 120 to be hooked.
- it could have the shape of a hook suitable for hooking the tooth.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2106814A FR3124654B1 (fr) | 2021-06-25 | 2021-06-25 | Corps de stator et méthode d’assemblage d’un tel corps |
| PCT/EP2022/067423 WO2022269075A1 (fr) | 2021-06-25 | 2022-06-24 | Corps de stator et methode d'assemblage d'un tel corps de stator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4360191A1 true EP4360191A1 (fr) | 2024-05-01 |
Family
ID=77411853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22741166.7A Pending EP4360191A1 (fr) | 2021-06-25 | 2022-06-24 | Corps de stator et methode d'assemblage d'un tel corps de stator |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4360191A1 (fr) |
| CN (1) | CN117581451A (fr) |
| FR (1) | FR3124654B1 (fr) |
| WO (1) | WO2022269075A1 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013090461A (ja) * | 2011-10-19 | 2013-05-13 | Denso Corp | アキシャルギャップ型回転電機の固定子およびアキシャルギャップ型回転電機 |
| ITMI20121569A1 (it) * | 2012-09-20 | 2014-03-21 | Wilic Sarl | Sistema di bloccaggio di segmenti di una macchina elettrica rotante di un aerogeneratore |
| AT522711A1 (de) * | 2019-07-09 | 2021-01-15 | Miba Sinter Austria Gmbh | Stator für eine Axialflussmaschine |
-
2021
- 2021-06-25 FR FR2106814A patent/FR3124654B1/fr active Active
-
2022
- 2022-06-24 EP EP22741166.7A patent/EP4360191A1/fr active Pending
- 2022-06-24 CN CN202280045275.XA patent/CN117581451A/zh active Pending
- 2022-06-24 WO PCT/EP2022/067423 patent/WO2022269075A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US20240348109A1 (en) | 2024-10-17 |
| FR3124654B1 (fr) | 2024-02-16 |
| CN117581451A (zh) | 2024-02-20 |
| FR3124654A1 (fr) | 2022-12-30 |
| WO2022269075A1 (fr) | 2022-12-29 |
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