EP4260438A1 - Rotor bobiné - Google Patents
Rotor bobinéInfo
- Publication number
- EP4260438A1 EP4260438A1 EP21820552.4A EP21820552A EP4260438A1 EP 4260438 A1 EP4260438 A1 EP 4260438A1 EP 21820552 A EP21820552 A EP 21820552A EP 4260438 A1 EP4260438 A1 EP 4260438A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- heads
- teeth
- sheet metal
- head
- 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
- H02K1/26—Rotor cores with slots for windings
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
Definitions
- the invention relates to the field of electrical machines with wound rotors.
- the invention relates to the field of the design and manufacture of wound rotors.
- An electric machine comprises a stator in which a rotor is installed.
- a stator in which a rotor is installed.
- wound rotors are known in particular.
- a wound rotor 1 is made of a stack of sheets of magnetic laminations 10 which are secured to each other.
- the rotor 1 has alternating teeth 11 and notches 12, windings 13 being installed around the teeth 11, in the notches 12, so as to create rotor poles.
- wedges 14 are installed in the notches 12, bearing radially 15 against the heads 16 of the teeth 11.
- Such a structure is disclosed in particular in the document FR3068538.
- the purpose of the varnishing process is to fill and surround the windings with varnish, and to avoid varnish on the outer surface.
- the varnish then solidifies the windings and provides better insulation between the windings.
- the rotor is first heated and then partially immersed in a varnish bath. The rotor rotates during soaking in the varnish bath. Then it is gelled in the oven. The rotor continues to rotate to prevent leaks and varnish drips, especially on the outer surface of the rotor.
- the air gap between the stator and the rotor 1 is generally of a radial length of substantially 1 mm.
- the layer of varnish must be thin in order to prevent the rotor 1 from touching the stator. For this reason, a varnish scraping procedure is implemented.
- the outer surface of rotor 1 is corrugated, as shown in FIG. 1a; the heads 16 of teeth 11 of the rotor 1 protruding radially with respect to the wedges 14. This is why in such a situation, the scraping must be carried out after the varnish has gelled.
- a coiled rotor made of a stack of sheets of sheet metal secured to each other, each sheet of sheet metal of the stack defining a circumferential alternation of teeth and notches, each tooth receiving a longitudinal winding intended to generating a rotor pole, and each tooth comprising an enlarged head, so that said windings are held in each notch around the teeth in radial support against said heads of the teeth framing said notch by wedges inserted in said notches.
- Each wedge has a wedge body inserted into the notch, a bearing surface against adjacent tooth heads, and a wedge head extending between adjacent tooth heads such that the alternating tooth heads and wedge heads of the rotor form a substantially cylindrical outline of the rotor; and said rotor being formed by the repetition of at least one stacking pattern comprising a succession of sheet metal sheets of different models and/or of sheets of the same model pivoted with respect to each other; each model of sheet metal differing from the others by the shape of the profile of the heads of the teeth; said stacking pattern being produced so that the shapes of the profiles of the superimposed heads vary, and so that, on average, the air gap volume facing the tooth heads is constant.
- the varnish can optimally penetrate the ends of the rotor tooth heads, ensuring a robust hold.
- a sheet metal sheet model comprises at least a part of the tooth heads having an elliptical external profile between its two ends.
- a model of sheet metal comprises at least a portion of tooth heads having an elliptical external profile terminated at each end by a fillet and a flattened edge.
- a sheet metal sheet model comprises at least a part of tooth heads having an elliptical external profile, in particular a piece of ellipse truncated at each end by a rounding, thus one can obtain a volume of air gap for this sheet model lower than for the heads of teeth known from the prior art.
- At least part of the wedges has the general shape of a triangular prism, and lateral recesses forming a radial bearing surface.
- At least part of the wedges has a body in the shape of a triangular prism surmounted by a head in the shape of a rectangular prism, separated by lateral recesses forming a radial bearing surface.
- each head has the same radial length relative to the center of the metal sheet. This ensures better uniformity of the sheets and therefore of the rotor.
- each head has the same direct distance between its two ends. This brings a greater uniformity of the heads.
- the invention also relates to an electric machine comprising a stator in which is installed a wound rotor as described above.
- the invention also relates to a motor vehicle comprising an electric machine as described above.
- FIG. 1a [Fig. 1 b] are schematic views of a rotor known from the prior art;
- FIG. 2a] is a schematic sectional view of a rotor according to one embodiment of the invention;
- FIG. 2b is a schematic perspective view of a rotor according to the embodiment of the invention of Figure 2a;
- FIG. 3 is a representation of three different models of sheet metal sheets making up a rotor according to the embodiment of the invention of Figure 2a;
- FIG. 4 is a representation of three different tooth tip profiles of a rotor according to the embodiment of the invention of Figure 2a;
- FIG. 5a [Fig. 5b] represent a detail view of a first superposition pattern of different models of sheet metal sheets according to one embodiment of the invention
- FIG. 6a [Fig. 6b] represent a detail view of another pattern for superimposing different models of sheet metal sheets according to a variant embodiment of the invention
- FIG. 7 represents a side view of a particular pattern of superposition of different models of sheets of sheet metal comprising punched tooth heads.
- FIG. 8a [Fig. 8b] represent two wedges according to the invention.
- an electric machine comprises a stator, not shown, in which a wound rotor 1 is installed.
- the wound rotor 1, also called rotor 1, comprises a longitudinal body 17, made of a stack of sheet metal parts 10, traversed along its length by a shaft 5 with center O and radius R.
- the shaft 5 is represented schematically in FIG. 2a, but in practice the shaft 5 is inserted by fitting into the body 17 and therefore has a shape substantially complementary to the internal radius of the body 17, the radius R of the shaft then reaching the internal slots of the sheets 10.
- the shaft 5, which is rotationally coupled to the body 17 of the rotor 1, extends in a longitudinal direction X.
- This same longitudinal direction X defines the main axis X of revolution of the rotor 1.
- Body 17 of rotor 1 defines a circumferential succession of teeth 11 and notches 12.
- Rotor windings 13 are installed in the notches 12 so as to surround the teeth 11 according to a longitudinal winding X.
- the rotor windings 13 define at each longitudinal end of the rotor 1 coil heads, not shown, held by holding rings.
- the set of coil heads at a longitudinal end X of the rotor 1 is also called the bun.
- the rotor 1 is formed from a stack of magnetic sheet metal 10.
- Each metal sheet 10 of the stack also defines a circumferential alternation of teeth 11 and notches 12.
- Each tooth 11 receives a longitudinal winding 13 intended to generate a rotor pole.
- each tooth 11 comprising an enlarged head 16.
- Each metal sheet 10 is selected from a plurality of different models 30-32, shown in Figure 3, of metal sheets 10.
- each model 30-32 of sheet metal 10 differs from the others in the shape of the profile of the heads of the teeth. However, in order to ensure correct stacking, it is defined that each different head has the same direct distance d between its two ends 16a, 16b, in other words that none of the stacked heads 16 protrude from the others in a substantially circumferential direction. Alternatively, the pole heads have slightly different maximum lengths in the circumferential direction.
- each head 16 has the same maximum radial length Rmax relative to the center of the sheet metal. In other words, no head 16 protrudes radially from the others.
- a first head profile corresponds to the profile known from the prior art.
- This external profile has the shape of a continuous ellipse 1600 between its two ends 16a, 16b.
- these three profiles 161, 162, 163 have different elliptical curves: the second profile having the most small radius of curvature while the third has the largest radius of curvature.
- Each model 30-32 of rotor sheet 10 can comprise for its tooth heads 11 different different profiles.
- the rotor 1 is then formed by repeating a stacking pattern comprising a succession of sheet metal sheets of different models and/or of sheets of the same model pivoted relative to each other, so as to vary the profiles of heads 16 superimposed according to a predetermined pattern.
- a pattern is defined consisting of the successive stacking of four sheet patterns positioned so that the head profiles follow the following repeating pattern: the third profile 162 superimposed on the first profile 160 , superimposed on the second profile 161 and superimposed to the first profile 160.
- Such a pattern according to the invention is preferably chosen so that for each head of this stack pattern, the average value of the air gap volume facing the head 16 of tooth 11 of the rotor created by this stack is constant.
- Another pattern shown in Figure 6a and Figure 6b, may include an alternation of two profiles: the third profile 162 superimposed on the second profile 161.
- Each pattern of sheet metal sheet 30-32 being able to present heads 16 of different teeth 11, it is moreover possible, according to a particular implementation of the invention, to produce stacking patterns by stacking the same patterns of metal sheets. , pivoted relative to each other so as to vary the heads 16 of teeth 11 aligned with each other. In the same way, patterns can be created combining the same 30-32 patterns rotated relative to each other and different 30-32 patterns.
- head models 16 having slots, through holes 70, 71 or any other punching, in a direction that is substantially circumferential, or tangential, or even radial, so as to obtain profiles as shown in figure 6b and figure 7.
- the wedges 14a, 14b have a wedge body 140 inserted in a notch 12, a bearing surface 15 radial against the heads 16 of adjacent teeth 11, and a wedge head 141 extending between the heads 16 of adjacent teeth 11, so that the alternating heads 16 of teeth 11 and heads 141 of wedges 14 of the rotor 1 form a substantially cylindrical contour of the rotor 1 as shown in particular in FIG. 2b.
- contour shape of the rotor 1 according to the invention differs from the rotor contour known from the prior art according to FIGS. 1a and 1b, in which the contour is wavy by the alternation of tooth heads 11 and wedges of the prior art.
- the superposition structure of the sheet metal sheets 10 with the different head profiles 16 of tooth 11 makes it possible to ensure optimum electromagnetic performance, while making the varnishing steps simpler, and gives the rotor good mechanical strength.
- a first wedge 14a according to the invention has the general shape of a triangular prism, with lateral recesses 142, 143 forming a bearing surface 15.
- Another wedge 14b has a body 140 in the shape of a triangular prism surmounted by a head 141 in the shape of a rectangular prism, separated by lateral recesses 142, 143 forming a support surface 15.
- this solution allows the varnish to better penetrate the ends of the rotor tooth heads, ensuring robust support, with a very thin surface varnish thickness, which thus allows optimal thermal conduction of the roto and a better reduction of losses. by friction.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2013141A FR3117696B1 (fr) | 2020-12-14 | 2020-12-14 | Rotor bobiné |
| PCT/EP2021/083197 WO2022128412A1 (fr) | 2020-12-14 | 2021-11-26 | Rotor bobiné |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4260438A1 true EP4260438A1 (fr) | 2023-10-18 |
Family
ID=74347409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21820552.4A Pending EP4260438A1 (fr) | 2020-12-14 | 2021-11-26 | Rotor bobiné |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4260438A1 (fr) |
| FR (1) | FR3117696B1 (fr) |
| WO (1) | WO2022128412A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11252832A (ja) * | 1998-03-06 | 1999-09-17 | Asmo Co Ltd | コア・シート、コアおよび電機子の製造方法 |
| DE102011090081A1 (de) * | 2011-12-29 | 2013-07-04 | Robert Bosch Gmbh | Lamellenpaket |
| KR101855763B1 (ko) * | 2016-06-03 | 2018-05-09 | 현대자동차 주식회사 | 계자권선형 구동모터 |
| DE102017205021A1 (de) * | 2017-03-24 | 2018-09-27 | Bayerische Motoren Werke Aktiengesellschaft | Polschuh, elektrische maschine und fahrzeug |
| FR3066333B1 (fr) * | 2017-05-09 | 2021-04-16 | Renault Sas | Rotor a poles vrilles pour machine electrique tournante synchrone. |
| FR3068538B1 (fr) | 2017-06-29 | 2020-01-10 | Renault S.A.S | Rotor de machine electrique. |
-
2020
- 2020-12-14 FR FR2013141A patent/FR3117696B1/fr active Active
-
2021
- 2021-11-26 WO PCT/EP2021/083197 patent/WO2022128412A1/fr not_active Ceased
- 2021-11-26 EP EP21820552.4A patent/EP4260438A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3117696B1 (fr) | 2024-05-03 |
| WO2022128412A1 (fr) | 2022-06-23 |
| FR3117696A1 (fr) | 2022-06-17 |
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Legal Events
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