WO2024104904A1 - Stator de machine électrique tournante comportant des isthmes pliables - Google Patents
Stator de machine électrique tournante comportant des isthmes pliables Download PDFInfo
- Publication number
- WO2024104904A1 WO2024104904A1 PCT/EP2023/081442 EP2023081442W WO2024104904A1 WO 2024104904 A1 WO2024104904 A1 WO 2024104904A1 EP 2023081442 W EP2023081442 W EP 2023081442W WO 2024104904 A1 WO2024104904 A1 WO 2024104904A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- notch
- foldable
- stator
- isthmuses
- notches
- Prior art date
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
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
- H02K3/493—Slot-closing devices magnetic
-
- 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
- H02K15/13—Applying slot closure means in the cores; Manufacture of slot closure means
-
- 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
- H02K15/08—Forming windings by laying conductors into or around core parts
- H02K15/085—Forming windings by laying conductors into or around core parts by laying conductors into slotted stators
-
- 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
-
- 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
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
Definitions
- the present invention relates to rotating electrical machines and more particularly to the stators of such machines.
- the yoke of the stator provides completely open or semi-open notches in the direction of the air gap, so as to allow the introduction of windings.
- the semi-open slots accommodate electrical conductors of circular cross section arranged in bulk, while the fully open slots accommodate electrical conductors of rectangular cross section, arranged in a row.
- the fully open slots are characterized by the fact that they open into the stator bore over their entire width, while the semi-open slots, which also open into the bore, only do so through a significantly narrower opening. This restriction corresponds to a local enlargement of the teeth which are on either side of the notch; these parts are commonly called notch isthmuses.
- a rigid wedge with a rectangular profile, which slides into grooves specially designed for this purpose in the teeth
- a flexible wedge of the “paper insulating” type at the bottom
- curved profile which is interposed between the conductors and the isthmuses.
- Patent application EP 1 283 583 relates to a stator comprising wires having a width substantially equal to the notch width. This stator is intended for a low voltage alternator such as 12 V or 24 V.
- a stator of a rotating electric machine comprising a stator mass having a plurality of notches and a winding arranged in the notches, the winding comprising bundles of round wires, at least one notch, or even each of the notches, comprising several round wires succeeding each other circumferentially, and at least one notch, or even each of the notches, being open towards an air gap of the machine and comprising two foldable isthmuses partially closing the corresponding notch.
- the stator includes a stator mass which can be produced by stacking magnetic sheets, the notches being made by cutting the sheets. Closing the notches on the air gap side is obtained by the foldable isthmuses which can be fitted in one piece with the rest of the sheets forming the stator mass.
- the stator mass can be produced at least partially by an additive manufacturing technique, in particular by powder sintering and machining.
- the stator may include a plurality of stacked wafers, each produced by additive manufacturing.
- the stator according to the invention may be devoid of attached magnetic wedges. The risk of detachment of closing wedges from the notches is eliminated.
- the stator mass may include teeth provided between the notches.
- each notch is semi-closed on the air gap side by two foldable isthmuses connected to two consecutive teeth of the stator mass.
- foldable isthmus we mean that an isthmus comprises a bridge of material connecting it to the tooth which is deformable, so as to allow a change in the orientation of the isthmus relative to the corresponding tooth.
- the foldable isthmus can be movable between a first position in which it extends into the bore of the stator, and a second position in which it partially closes the opening of the notch, and extends in the extension of an edge of the tooth defining the stator bore.
- the foldable isthmuses are arranged at the foot of the corresponding tooth. Bendable isthmuses are integral with adjacent teeth. Each tooth may include at least one foldable isthmus, in particular two foldable isthmuses.
- the cylinder head is made in one piece with the teeth.
- the stator thus has no cylinder head attached to a serrated crown.
- At least one slot, or even each of the slots, can be opened towards the stator bore.
- At least one notch, or even each of the notches, may include several round wires succeeding each other radially.
- the winding has round wires.
- a diameter of round wires can be between 0.8 and 2 mm.
- the diameter of the wires is small compared to the size of a notch.
- a ratio of the wire diameter to a notch width can be less than 0.5, better still less than 0.6, even better less than 0.7, even less than 0.8, or even less than 0.9.
- the round wires can be arranged roughly staggered in the corresponding notch.
- the stator notches can receive a superposition of beams corresponding to different phases; the beams of the different phases can be isolated by thin insulators, from each other and from the stator mass.
- the bundles can be made up of a variable number of turns; the turns can include a variable quantity of wires in parallel, and these wires in parallel can be a mixture of different diameters.
- At least one foldable isthmus better all the foldable isthmuses can have a length greater than 2 mm, better still greater than 2.5 mm, or even greater than 3 mm.
- At least one collapsible isthmus better all collapsible isthmuses can have a length less than 10 mm, better less than 9 mm, or even less than 8 mm.
- At least one collapsible isthmus better all the collapsible isthmuses can have a length corresponding to 20 to 45% of the width of the notch.
- the length of the foldable isthmuses can be quite significant, since in their folded position, the foldable isthmuses almost completely close the notches.
- At least one foldable isthmus can be connected to the corresponding tooth by a bridge of material delimited by a cutout made on the side of the notch. The presence of the cutout makes it possible to encourage the folding of the corresponding foldable isthmus to partially close the notch.
- the cutout can be in cross section of generally triangular shape, especially when the isthmus is unfolded.
- the cutout forms a notch at the base of the foldable isthmus, which facilitates its folding after insertion of the wires. It can be triangular or any other shape.
- the two foldable isthmuses partially closing a notch can provide a notch opening between them.
- a width of the notch opening provided between the two foldable isthmuses of the notch can be, when the isthmuses are folded, less than 40% of the width of the notch, better still less than 30%, being for example the order of 20% of the width of the notch. This narrowing of the opening is particularly advantageous because
- an opening whose width is slightly greater than the air gap is a good compromise.
- the width of the notch opening can be, when the isthmuses are folded, greater than the width of the air gap. In this configuration, the quality of the signal can be improved, without unnecessarily short-circuiting part of the magnetic flux in the stator.
- the two foldable isthmuses partially closing a notch can provide a notch opening between them.
- a width of the notch opening provided between the two foldable isthmuses of the notch can be, when the isthmuses are unfolded, greater than 60% of the width of the notch, better still greater than 70%, being for example the order of 80% of the width of the notch.
- the ratio can be of the order of 50%.
- At least one notch, preferably all notches, may have a flat bottom. The edge of the notch defining the bottom of the notch may be at least partially rectilinear.
- At least one notch may have two radial edges parallel to each other.
- the notches may be of substantially rectangular shape.
- At least one tooth can have two radial edges converging in the direction of the axis of rotation of the machine.
- a ratio of the surface area of a notch to the section of the wires of the notch may be less than 2.5, or even strictly less than 2.5, in particular less than 2.4, or even less than 2.3, better still less to 2.2, being for example of the order of 2 only.
- the invention also relates, independently or in combination with the above, to a rotating electric machine comprising a stator as described above and a rotor.
- the machine may be an alternator. It may be an alternator producing a voltage greater than 100 V, better still greater than 200 V, for example greater than 300 V, being for example of the order of 400 V or more.
- the voltage delivered can be alternating. It can be three-phase. The different phases can be distributed in the notches. The winding can be shortened.
- the power supplied can be of the order of a few kVA to several MVA.
- the stator according to the invention can advantageously be wound for different voltages, frequencies, and powers.
- the invention also relates, independently or in combination with the above, to a method of manufacturing a stator of a rotating electrical machine as described above, in which bundles of round wires are inserted into the notches of the stator by introducing them radially into the corresponding notches starting from one of the axial ends of the machine, with a longitudinal translation.
- the wire bundles can be wound into closed turns, the shape of which is comparable to rectangles with rounded corners, thus forming coils. There can be continuity between the different coils of the same phase when the windings are formed. You can have either single coils or a string of coils.
- Coils can be formed on winding shapes.
- the winding shapes used can be configured to guide and hold the wire bundles, while keeping the bobbin heads free. Thus, the arrangement of the wires in the bundles can be controlled much better.
- Winding shapes may have grooves to receive the wires. They can be U-shaped in cross section. These grooves which receive the wires can have a width equivalent to, or even slightly less than, the width of a notch.
- the coils are inserted into the stator bore opposite their respective slots, and the wires of the bundles are inserted into the slot through the slot opening.
- the introduction of a bundle is done gradually by spreading the wires through the opening.
- the diameters of the wires which constitute the bundle are smaller than the width of the notch opening.
- the coils may first be lightly engaged in the bore of the stator mass by one of the axial ends of the machine on the side which is opposite to their final position, so that the beginning of the beams enters the notch between the isthmuses. A small part of the beams are then in the notch, and the rest is waiting in front of the stator mass. The beams are then translated longitudinally towards the opposite side of the stator mass. In this movement, the part of the beams which are outside the stator mass slide in the notches, and the front parts of the beams which pass through the notch opening end up emerging at the downstream end of the stator mass. At the end of this translation, the beams are inside the notches.
- the filling of a notch can be carried out by installing the insulators at the bottom of the notch, then by inserting a first beam, then if necessary by installing inter-beam insulators, then by the insertion of a second beam, and finally by the installation of notch closure insulators.
- This operation is repeated as many times as necessary to enter the different reels.
- sheets can be cut beforehand to form the stator mass, the sheets having foldable isthmuses extending into the stator bore.
- the isthmuses When cutting the poles, the isthmuses are open, being unfolded. They may have edges converging towards the axis of rotation of the machine.
- the collapsible isthmuses may not be tangential to the bore to form the boundary between the interior of the notch and the central bore of the sheet metal. Their orientation is rather radial and they extend into the bore. They are connected to the teeth by a geometry which will subsequently favor their change of position. Their length can also be quite significant, since in their future folded position, the foldable isthmuses will almost completely close the notches. Bendable isthmuses, which can extend the radial edges of the notches into the bore, do so with a non-zero angle that allows the notch opening to be slightly reduced.
- the stator mass can be formed from a strip of sheet metal cut into sectors, each sector comprising one or more notches and/or one or more teeth. Alternatively, a sheet of the stator mass can be formed from a plurality of sectors assembled together, each sector comprising one or more notches and/or one or more teeth.
- a sector may include cooling channels or cooling fins.
- the isthmuses of one sector can be cut between cooling fins of another sector. Before cutting, they can be nested.
- At least one foldable isthmus can form a non-zero angle with the radial edges of the corresponding notch before folding.
- the angle can be between 5° and 45°, better between 10° and 40°, even between 15° and 35°, even better between 20° and 30°.
- the angle can be small enough so as not to disrupt the arrangement of the wires during their insertion. In addition, the angle may nevertheless be sufficient so that the isthmuses can retain the notch closing insulators.
- the foldable isthmuses are folded so as to be in the extension of the teeth of the stator.
- the outline of the stator at its bore may be cylindrical or substantially cylindrical in shape. Once folded, the foldable isthmuses do not form reliefs in the air gap.
- the wires have more space than the space of the notch alone. In fact, they also have a space provided by the isthmuses open before folding. The folding of the isthmuses thus forces the wires to pack into the notch, the space provided by the isthmuses opened before folding then no longer being available.
- the round wires When we pack the round wires into the corresponding notch, the round wires can be arranged substantially in a staggered pattern, given their circular section. They are pushed by the internal edges of the isthmuses. The excess of wires is reduced.
- Figure 1 represents in cross section, schematically and partially, a notch of a stator according to the invention.
- Figure 2 represents in cross section, schematically and partially, the notch of Figure 1 with the foldable isthmuses unfolded.
- Figure 3 a represents in cross section, schematically and partially, the notch of Figure 1, superimposed with a notch of the prior art.
- Figure 3b represents in cross section, schematically and partially, the notch of Figure 1 with the foldable isthmuses unfolded, superimposed with a notch of the prior art.
- Figure 4a represents in cross section, schematically and partially, the notch of Figure 1 with the foldable isthmuses unfolded.
- Figure 4b is a view similar to Figure 4a of a notch of the prior art.
- Figure 5 is a view similar to Figure 2 of an alternative embodiment.
- FIG 6 illustrates the method of manufacturing a stator according to the invention.
- FIG. 1 We illustrate in Figure 1 a notch 10 of stator 1 of a rotating electric machine, with a stator mass 3 and a winding 5 arranged in the notch 10.
- the winding 5 comprises bundles of round wires 6, the notch 10 comprising, as illustrated, several round wires 6 succeeding one another circumferentially and radially.
- a diameter of the round wires 6 can be of the order of 1 mm.
- a ratio of the diameter d of wires to a width Le of notch can be of the order of 10, the width Le of the notch notch being approximately 10 mm.
- the round wires 6 are arranged substantially staggered in the corresponding notch.
- the notch 10 receives a superposition of two beams corresponding to two different phases, the beams of the two phases being isolated, from each other and from the stator mass 3, by thin insulators 12.
- the notch 10 is open towards an air gap of the machine and the stator bore, and has two foldable isthmuses 20 partially closing it.
- the notch having come by cutting the sheets, the closure of the notches on the side of the air gap is obtained by the foldable isthmuses 20 which come in one piece with the rest of the sheets forming the stator mass 3.
- Notch 10 has a flat bottom.
- the edge 13 of the notch defining the bottom of the notch is rectilinear, with rounded corners.
- the notch 10 also has two radial edges 14 parallel to each other. The notch 10 is thus of substantially rectangular shape.
- the stator mass 3 comprises teeth 8 provided between the notches 10.
- each notch 10 is semi-closed on the side of the air gap by two foldable isthmuses 20 connected to two consecutive teeth 8 of the stator mass 3.
- the foldable isthmuses 20 are arranged at the foot of the corresponding tooth 8.
- the foldable isthmuses 20 are in one piece with the adjacent teeth 8.
- Each tooth 8 has two foldable isthmuses 20.
- Each isthmus 20 includes a bridge of material 21 connecting it to the tooth 8 which is deformable, so as to allow a change in the orientation of the isthmus relative to the corresponding tooth.
- the foldable isthmus 20 is movable between a first position illustrated in Figure 2 in which it extends into the bore of the stator, and a second position illustrated in Figure 1 in which it partially closes the opening of the notch 10, and extends in the extension of an edge of the tooth 8 defining the bore of the stator.
- the material bridge 21 is delimited by a cutout 22 made on the side of the notch 10, which makes it possible to promote the folding of the corresponding foldable isthmus 20 to partially close the notch 10.
- the cutout 22 is in this example in section transversal with a generally triangular shape.
- the cutout 22 forms a notch at the base of the foldable isthmus 20, which makes it easier to fold after inserting the wires. It can be triangular or of any other shape, as illustrated by way of example in Figure 5, where the cutout 22 is a little deeper.
- the foldable isthmus 20 has in the example described a length Li of approximately 4 mm, or approximately 40% of the notch width.
- the length of the foldable isthmuses 20 can be enough important, since in their folded position, the foldable isthmuses 20 almost completely close the notches 10.
- the two foldable isthmuses 20 partially closing the notch 10 provide between them a notch opening 30, a width If of the notch opening 30 provided between the two foldable isthmuses 20 of the notch being, when the isthmuses are folded as illustrated in Figures 1 and 3a, of the order of 20% of the width Le of the notch.
- the two foldable isthmuses 20 partially closing a notch 10 provide between them a notch opening 35, a width lo of the notch opening 35 provided between the two foldable isthmuses of the notch being, when the isthmuses are unfolded as illustrated in Figure 4a and 3b, of the order of 80% of the width Le of the notch.
- the ratio can be of the order of 50%, as shown in Figure 4b.
- the sheets comprising foldable isthmuses 20 extending into the stator bore, as illustrated in Figure 3b.
- the isthmuses 20 are open, being unfolded.
- the collapsible isthmuses are not tangential to the bore to form the boundary between the interior of the notch and the central bore of the sheet metal. Their orientation is rather radial and they extend into the bore.
- the foldable isthmuses which extend the radial edges of the notches in the bore, do so with a non-zero angle y which makes it possible to reduce the notch opening 35.
- the foldable isthmuses 20 thus form, before folding, a non-zero angle y with the radial edges 14 of the notch 10.
- bundles of round wires 6 are inserted into the notches 10 of the stator by introducing them radially into the corresponding notches starting with one of the axial ends of the machine, with a longitudinal translation, as illustrated in Figure 6 Since the collapsible isthmuses 20 are in the open position, the notches are almost completely open on the stator bore. Also, we obtain a distribution of wires within the notches that is much less chaotic than in a classic semi-open notch, as illustrated in Figure 2.
- the coils may first be lightly engaged in the bore of the stator mass by one of the axial ends of the machine on the side which is opposite to their final position, so that the beginning of the beams enters the notch between the isthmuses. A small part of the beams are then in the notch, and the rest is waiting in front of the stator mass. The beams are then translated longitudinally towards the opposite side of the stator mass. In this movement, the part of the beams which were outside the stator mass slide in the notches, and the front parts of the beams which passed through the notch opening end up emerging at the downstream end of the stator mass. At the end of this translation, the beams are inside the notches.
- the filling of a notch 10 is carried out by the installation of the insulators 12 at the bottom of the notch, then by the insertion of a first beam, then if necessary by the installation of inter-beam insulators , then by the insertion of a second beam, and finally by the installation of notch closure insulators.
- the foldable isthmuses 20 are folded so as to be in the extension of the teeth 8 of the stator 1.
- the contour of the stator 1 at the level of its bore is of cylindrical or substantially cylindrical shape. Once folded, the foldable isthmuses 20 do not form reliefs in the air gap.
- the wires 6 have a larger space than the space of the notch 10 alone. In fact, they also have a space provided by the open isthmuses 20 before folding. The folding of the isthmuses 20 thus forces the wires 6 to pack into the notch, the space provided by the isthmuses opened before folding then no longer being available.
- the round wires When we pack the 6 round wires into the corresponding notch, the round wires can be arranged substantially in a staggered pattern, given their circular section. They are pushed by the internal edges of the isthmuses. The excess of wires is reduced.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Windings For Motors And Generators (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202380078779.6A CN120226237A (zh) | 2022-11-15 | 2023-11-10 | 包括可折叠峡部的旋转电机的定子 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FRFR2211860 | 2022-11-15 | ||
FR2211860A FR3142052A1 (fr) | 2022-11-15 | 2022-11-15 | Stator de machine électrique tournante comportant des isthmes pliables |
Publications (1)
Publication Number | Publication Date |
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WO2024104904A1 true WO2024104904A1 (fr) | 2024-05-23 |
Family
ID=84887595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2023/081442 WO2024104904A1 (fr) | 2022-11-15 | 2023-11-10 | Stator de machine électrique tournante comportant des isthmes pliables |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN120226237A (fr) |
FR (1) | FR3142052A1 (fr) |
WO (1) | WO2024104904A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54176802U (fr) * | 1978-06-01 | 1979-12-13 | ||
JP2002101581A (ja) * | 2000-09-26 | 2002-04-05 | Showa Corp | モータ回転子 |
EP1283583A2 (fr) | 2001-08-08 | 2003-02-12 | Delphi Technologies, Inc. | Stator à haut taux de remplissage des encoches |
US20110025165A1 (en) * | 2009-07-31 | 2011-02-03 | Hitachi, Ltd. | Rotating electrical machine |
US20190020228A1 (en) * | 2016-01-12 | 2019-01-17 | Mitsubishi Electric Corporation | Stator for rotary electric machine, rotary electric machine, and method for manufacturing stator for rotary electric machine |
US20190280573A1 (en) * | 2018-03-06 | 2019-09-12 | GM Global Technology Operations LLC | Method of manufacturing a stator |
-
2022
- 2022-11-15 FR FR2211860A patent/FR3142052A1/fr active Pending
-
2023
- 2023-11-10 CN CN202380078779.6A patent/CN120226237A/zh active Pending
- 2023-11-10 WO PCT/EP2023/081442 patent/WO2024104904A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54176802U (fr) * | 1978-06-01 | 1979-12-13 | ||
JP2002101581A (ja) * | 2000-09-26 | 2002-04-05 | Showa Corp | モータ回転子 |
EP1283583A2 (fr) | 2001-08-08 | 2003-02-12 | Delphi Technologies, Inc. | Stator à haut taux de remplissage des encoches |
US20110025165A1 (en) * | 2009-07-31 | 2011-02-03 | Hitachi, Ltd. | Rotating electrical machine |
US20190020228A1 (en) * | 2016-01-12 | 2019-01-17 | Mitsubishi Electric Corporation | Stator for rotary electric machine, rotary electric machine, and method for manufacturing stator for rotary electric machine |
US20190280573A1 (en) * | 2018-03-06 | 2019-09-12 | GM Global Technology Operations LLC | Method of manufacturing a stator |
Also Published As
Publication number | Publication date |
---|---|
CN120226237A (zh) | 2025-06-27 |
FR3142052A1 (fr) | 2024-05-17 |
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