EP3931948A1 - Dispositif de connexion pour stator - Google Patents
Dispositif de connexion pour statorInfo
- Publication number
- EP3931948A1 EP3931948A1 EP20714266.2A EP20714266A EP3931948A1 EP 3931948 A1 EP3931948 A1 EP 3931948A1 EP 20714266 A EP20714266 A EP 20714266A EP 3931948 A1 EP3931948 A1 EP 3931948A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connection
- metal elements
- stator
- support
- elements
- 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
- 229910052751 metal Inorganic materials 0.000 claims abstract description 165
- 239000004020 conductor Substances 0.000 claims abstract description 116
- 230000002093 peripheral effect Effects 0.000 claims abstract description 51
- 238000004804 winding Methods 0.000 claims abstract description 44
- 239000002184 metal Substances 0.000 claims description 37
- 239000004033 plastic Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 229910000679 solder Inorganic materials 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 17
- 230000008901 benefit Effects 0.000 description 7
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
-
- 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 synchronous or asynchronous alternating current machines, and in particular traction or propulsion machines for electric motor vehicles (Battery Electric Vehicle) and / or hybrids (Hybrid Electric Vehicle - Plug-in Elybrid Electric Vehicle), such as as individual cars, vans, trucks or buses.
- the invention also applies to rotating electrical machines for industrial and / or energy production applications, in particular naval or wind turbines.
- the invention relates more particularly to connection devices used to connect the coils of a stator to a power supply bus thereof.
- connection devices to facilitate the connection of the windings of an electric machine stator to a power bus.
- connection device is known from application US 2011/0175471, and comprises three metal elements having connection lugs to the stator conductors as well as to the supply bus, and a plastic support, molded onto these elements.
- the leads for connection to the conductors are mostly open in the circumferential direction.
- the overmolding of the support on all the metal elements is a complex operation because the molding operation is critical given the positioning precision of the metal elements.
- the mold is complex, because the plastic material must not cover the connection lugs, and the metal elements must be positioned precisely in this mold.
- connection device which is reliable and which meets the requirements of large-scale industrial production, such as in the automobile, by being in particular easy to manufacture and to use.
- connection device which makes it possible to simplify the connection to a supply bus of the stator.
- connection device making it possible to simplify the production of the stator windings and / or to gain in compactness.
- connection device for a stator comprising:
- Peripheral metal elements each comprising at least one lug for connection to a stator winding conductor, this lug having a groove open radially outwards to receive the conductor, this groove being preferably delimited at least partially by a flanged edge, of preferably radially oriented, at least some of these peripheral metal elements further comprising at least one tab for connection to a stator power supply bus, at least part of the metal elements comprising a curvilinear portion connecting the connection tabs to each other, a insulating support for retaining the metal elements, preferably comprising housing for receiving the metal elements.
- connection device makes it possible to easily connect the conductors of the coils to each other and / or to the terminals of the supply bus, the number of these terminals being typically equal to the number of phases.
- the orientation and shape of the connection lugs intended to be connected to the conductors of the windings allows easy and reliable connection of the windings.
- the strand or strands of a conductor can engage in the aforementioned groove, preferably with play so as to facilitate the insertion of the conductors into the corresponding tabs. All the conductors can be placed in the grooves provided for this purpose on the tabs of the metal elements, and thus prepositioned while awaiting welding. The welds can then be carried out using a tool which presses the conductors against the fallen edges.
- the presence of the grooves limits the risk of incorrect positioning of the conductors during welding, and can facilitate the action of the welding tool.
- the fallen edges there is a relatively large contact surface between the conductors and the lugs, conducive to good quality of electrical contact and to good mechanical strength, in particular with respect to vibrations.
- the flanged edge is preferably formed by a portion bent at right angles. We then take advantage of the space freed by the formation of the elbow to make the groove, the width of the corresponding raised edge of preferably substantially the width of the groove minus the thickness of the metal sheet from which the element was made.
- connection lug to the power supply bus is preferably rigidly linked to the rest of the corresponding metal element.
- the number of connection lugs to the winding conductors is for example 6, and that of the connection lugs to the power supply bus equal to the number of phases, in particular 3, the number of phases of the machine not however being limited. to 3 and may be other, in particular greater than 3.
- the power bus connection tabs can be aligned in a plane or arranged in an arc of a circle. An arcuate arrangement can make it possible to gain in compactness.
- the legs can be in the form of connector rings, if desired.
- connection device can provide a star or delta connection of the stator phases.
- a single insulating support can be provided, on which the metal elements are fixed in a predefined manner according to the star or delta assembly. This makes it possible to reuse the same insulating support to make connection devices suitable for a star connection and others suitable for a delta connection.
- connection device comprises metal belt elements, radially inside said peripheral metal elements, held by the insulating support and each having two free ends for connection to one or more conductors of the stator.
- metal belt elements simplify the production of the windings by avoiding having to extend certain conductors of the coils out of the notches of the stator to ensure electrical continuity between the conductors engaged in certain notches.
- the metal belt elements are for example 3 in number. The invention makes it possible to take advantage of the presence of the support to hold the metal belt elements in the appropriate locations.
- connection ends of each metal belt element preferably each have a groove oriented in the circumferential direction. This groove is preferably narrow enough to obtain a tightening of the conductor inserted inside, as soon as it is inserted into the groove.
- the support comprises a nut holder comprising housings and associated nuts, retained in these housings, intended to receive assembly screws of the bus.
- the power supply bus may include a three-terminal plug formed by rigid connection lugs, parallel to each other, each traversed by a hole allowing the passage of a fixing screw on the nut holder. These three terminals can be coplanar.
- the plug can be connected to a connection cable to power electronics.
- the bracket can extend for less than a full turn, which helps to make the stator compact.
- the connection device is arranged at an axial end of the stator.
- the latter is preferably a stator radially outside the rotor.
- the support is formed from a single piece of plastic material.
- the support comprises several assembled parts.
- the support can be produced by injection molding of thermoplastic material, or otherwise, for example by machining or by an additive manufacturing technique.
- the support is preferably prefabricated before the placement of at least one of the metal elements on the support, and in particular all the metal elements on the support. This avoids the use of a complex mold.
- the radial orientation of the lugs and receiving grooves of the peripheral metal elements is compatible with the mounting of the metal elements on the support.
- the support may have grooves open radially inwards to accommodate the peripheral metal elements, openings opening radially to the outside being provided for the passage of the connection lugs to the conductors of the coil. These peripheral metal elements can be introduced radially into said grooves, by a movement directed from the inside to the outside.
- the support is designed to retain the metal elements by snap-fastening. This avoids the use of screws and simplifies the assembly operation.
- the support may include lugs for retaining the metal elements by snap-fastening, made in one piece with the support. At least one of the metal elements can also include at least one relief adapted to snap onto the support.
- the aforementioned connection tabs engaged through the openings of the support have teeth which hook onto the edge of the support once the opening has been crossed.
- the support may include at least two grooves located at different heights on the support, to receive the peripheral metal elements.
- the support can include a third groove offset in height with respect to the other two and radially more interior than the other two, to receive the metal belt elements.
- At least one of the peripheral or belt metal elements can alternatively be introduced into the support by moving it in the circumferential direction therein, the metal element then preferably comprising a relief ensuring its retention radially on the support once engaged in it.
- the peripheral metal elements can alternatively be held by screws on the support.
- connection device for a stator comprising:
- Peripheral metal elements each comprising at least one lug for connection to at least one stator winding conductor, at least some of these peripheral metal elements further comprising at least one lug for connection to a stator power bus,
- metal belt elements intended to connect stator winding conductors, the metal belt elements being radially offset with respect to the peripheral metal elements, in particular being radially inside them,
- an insulating support for retaining the peripheral metal elements and the belt, preferably comprising housing for receiving the metal elements.
- connection lugs to the conductors of the stator winding are not limited to a particular shape.
- the presence of the metal belt elements avoids having to produce some of the stator winding conductors with relatively long portions extending outside the magnetic circuit of the stator, which simplifies the production of the winding and makes it possible to gain in compactness. .
- This also simplifies the making of the pins when the winding is done with pins.
- the metal belt elements provide a bridging between certain pins in a particularly compact manner, taking advantage of the free space present on the radially inner side of the metal elements used for connection to the supply bus. All the characteristics stated above in connection with the first aspect of the invention can be repeated in this second aspect of the invention.
- Another subject of the invention is a connection device for a stator, comprising:
- Peripheral metal elements each comprising at least one lug for connection to at least one stator winding conductor, at least some of these peripheral metal elements further comprising at least one lug for connection to a stator power bus,
- an insulating support for maintaining the metal elements this support being produced with a nut holder, this nut holder comprising housings defined by the insulating support, in which respective nuts are received, the connection lugs to the power bus being arranged relative to said housings so as to allow the establishment of an electrical contact with terminals of the supply bus, held in place by means of tightening screws engaged in the nuts.
- the electrical connection to the power supply bus is simplified because the use of an additional terminal block is avoided. Assembly time and reliability can be saved, the number of constituent parts to be assembled being reduced. All the characteristics stated above in connection with the first aspect of the invention can be repeated in this third aspect of the invention.
- the use of flexible wires connected directly to the connection lugs on the connection device can be avoided, and the power supply bus can be made with terminals formed by rigid metal lugs, which are pressed against the tabs of the connection device and held against them by the screws engaged in the nuts. This makes the positioning of the power bus conductors more reliable and the electrical connection is facilitated.
- connection device for a stator comprising:
- Peripheral metal elements each comprising at least one lug for connection to at least one stator winding conductor, at least some of these peripheral metal elements further comprising at least one lug for connection to a stator power bus,
- metal belt elements intended to connect stator winding conductors, the metal belt elements being radially offset with respect to the peripheral metal elements, an insulating support for retaining the peripheral metal elements and any metal belt elements, comprising housing for receiving the metal elements, at least one of the metal elements being retained by snap-fastening on the support.
- the fixing of the metal elements is ensured in a reliable manner and compatible with rapid assembly.
- the support can be made with retaining means such as clamps and / or teeth which deform elastically upon insertion of the metal elements into the support to retain them thereon.
- the insertion of the metal elements can be done in the radial direction.
- snap-fastening reliefs can be produced on the metal elements.
- the connection lugs to the conductors of the stator winding include at least one tooth which opposes the removal of the element once placed on the support.
- the latter may have openings through which the tabs are introduced, and at least some of these tabs may include on opposite sides teeth which bear against the edge of the corresponding opening to retain the dough engaged through the opening.
- connection device can be prefabricated, for example by injection molding, and the metal elements are then fixed by snapping onto the support. All the characteristics stated above in connection with the first aspect of the invention can be repeated in this fourth aspect of the invention.
- stator connection device comprises:
- Peripheral metal elements each comprising at least one lug for connection to a stator winding conductor, at least some of these peripheral metal elements further comprising at least one lug for connection to a power bus of the stator, at least part of the metal elements comprising a curvilinear portion connecting the connection lugs between them,
- an insulating support for retaining the metal elements, preferably comprising housing for receiving the metal elements, the insulating support being produced with means for positioning the metal elements allowing the use of this insulating support either to ensure a star connection, or to ensure a delta connection of the phases of the stator.
- connection device is advantageous in that it makes it possible to manufacture only one type of insulating support capable of being used for the manufacture of connection devices that can be used either for a delta connection of the phases of the stator, or for a star connection, depending on the locations of the bracket used to position the metal elements. It is thus possible to reduce the number of references necessary for the manufacture of connection devices and to benefit from an economy of scale.
- stator connection device comprises:
- Peripheral metal elements each comprising at least one lug for connection to a stator winding conductor, at least some of these peripheral metal elements further comprising at least one lug for connection to a power bus of the stator, at least part of the metal elements comprising a curvilinear portion connecting the connection lugs between them,
- an insulating support for retaining the metal elements in at least two layers of elements located at different axial positions on the support.
- the number of layers is two, the insulating support comprising two grooves located at different heights, each capable of accommodating one or more metal elements.
- the number of grooves is three, making it possible to accommodate peripheral metal and belt elements on three levels.
- stator connection device comprises:
- Peripheral metal elements each comprising at least one lug for connection to a stator winding conductor, this lug having at least one surface for connection to a conductor of the stator, at least some of these peripheral metal elements further comprising at least one lug of connection to a stator power supply bus, at least part of the metal elements comprising a curvilinear portion connecting the connection lugs to each other, an insulating support for retaining the metal elements, preferably comprising housing for receiving the metal elements.
- connection surface can be defined by a flanged edge, oriented radially.
- the connection surface can be oriented radially.
- the flanged edge provides a larger contact area for attaching a conductor to the stator, and its radial orientation facilitates the positioning and soldering of the conductor, even when the conductor has limited flexibility.
- the orientation of the connection surfaces according to this aspect of the invention facilitates the mounting of the connection device and makes it possible to take advantage of the flexibility of the stator conductors to have a more hyperstatic mounting and not to force too much on the welds.
- the device according to the invention may have all or some of the following characteristics, which can be taken alone or in combination with each other or with the above:
- the power bus connection lugs are connected to the rest of the element by a U-shaped portion
- one of the elements has a tab for fixing a temperature sensor
- connection lugs for the stator conductors which connect to the rest of the element by a radial extension located in the plane of the curvilinear portion of the element;
- At least one tab for connecting to a stator conductor is formed by a 90 ° bend carried by said radial extension;
- the device has at least one connection surface to a stator conductor which is connected to the rest of the element by a first 90 ° bend around a geometric axis and by a second 90 ° bend around a second geometric axis perpendicular to the first, the tabs preferably being oriented axially in a direction opposite to the stator and their main face being oriented substantially radially; the tabs can provide a surface for receiving the stator conductors which extends over the entire width of the tab, which facilitates the welding operation and makes it possible to have a large current conduction section; such a lug shape makes it possible in particular to weld one end of the conductor of the stator formed of several strands arranged side by side; the orientation of the tab limits the deformations to be imposed on the stator conductors to bring them into a configuration allowing their ends to be welded to a tab corresponding, which facilitates the manufacture of the stator, in particular in a compact form
- At least one of the conductive elements has a positioning hole in the mold serving to mold the insulating support
- the insulating support has at least one recess which is the mark left by a member for holding a conductive element in the mold; the presence of these recesses, which open onto a corresponding conductive element, is advantageous in that it allows the immobilization of the conductive element by pinching without having to make bores therein, bores which would locally reduce the section of passage offered to current;
- At least one of the conductive elements has an inward projection, preferably located in the extension of a radial extension, with an edge preferably coming in the extension of an edge of the extension, which can facilitate the production of the advance by cutting at the same time as the radial extension; the projection (s) are preferably not covered by the plastic material of the insulating support at their free end,
- the insulating support is produced with at least one stud serving for positioning during assembly on the stator, and preferably at least two positioning studs, these studs possibly having different heights on the stator side; in particular, these pads can make it possible to ensure the parallelism of the insulating support with the package of stator sheets;
- stator connection lugs are located on the side of the insulating support which is radially outside; it is thus possible to provide a relatively large internal diameter of the support, facilitating the positioning of the rotor,
- connection lugs to the stator conductors carrying pieces of solder crimped onto the material of the tabs, these pieces of solder being present during assembly of the conductive elements in the mold.
- the subject of the invention is also an electric machine stator comprising a winding whose conductors are connected to a connection device according to the invention, as defined above.
- This connection device can be according to any of the different aspects of the invention mentioned above.
- the winding can include I-shaped or U-shaped pins.
- the coil may include conductors connected to the metal belt elements.
- the stator can be wavy winding or the like.
- a further subject of the invention is a method for manufacturing a stator according to the invention, in which the conductors of the coils are all placed in relation to the connection lugs of the metal elements before being welded thereto.
- Fig 1 schematically shows an example of a connection device made in accordance with the invention
- Fig 2 shows in isolation the insulating support of the connection device of Figure 1
- Fig 3 illustrates the assembly of the components of the connection device of Figure 1
- Fig 4 is a schematic section of the connection device
- Fig 5 is a view similar to Figure 1 of a variant of the connection device
- Fig 6 is a view similar to Figure 1 of another variant of the connection device
- Fig 7 shows the nut holder fitted with screws
- Fig 8 shows an example of retaining means
- Fig 9 shows a detail of the device of Figure 6,
- Fig 10 is a schematic section of the device of Fig 5,
- Fig 11 illustrates the connection of the connection device to a power supply bus
- Fig 12 illustrates an alternative embodiment of means for holding the metal elements in the support
- Fig 13 illustrates a variant of mounting the metal elements in the support
- Fig 14 shows a detail of the device of Figure 13,
- Fig 15 is a view similar to Figure 14, of an alternative embodiment of the retaining means
- Fig 16 is a view similar to Figure 1 of an alternative embodiment of the connection device of Figure 1,
- Fig 17 shows a stator equipped with a connection device according to the invention
- Fig 18 shows a detail of an embodiment of a connection tab
- Fig 19 shows a stator equipped with a connection device such as that in Figure 1,
- Fig 20 shows a connection tab having at least one flanged edge
- Fig 21 illustrates an arrangement of the connection terminals to the power supply bus in an arc of a circle
- Fig 22 illustrates the phase connection using a star connection
- Fig 23 illustrates the phase connection using a delta connection
- Fig 24 shows in perspective an alternative embodiment of the connector
- Fig 25 is a view similar to Figure 24 from another angle of view
- Fig 26 is a view similar to Figure 24 from another viewing angle
- Fig 27 is a view similar to Figure 24 from another angle of view
- Fig 28 shows in isolation the metal elements of the connector of figure 24,
- Fig 29 is a view similar to Figure 28 from another viewing angle
- Fig 30 is a view similar to Figure 28 from another angle of view
- Fig 31 is a view similar to Figure 28 from another angle of view
- Fig 32 shows in isolation the plastic part overmolded on the metal elements
- Fig 33 is a view similar to Figure 32 from another angle of view
- Fig 34 is a view similar to Figure 32 from another angle of view
- Fig 35 is a view similar to Figure 32 from another viewing angle
- Fig 36 schematically and partially illustrates the assembly of the connector of Figure 24 and the coil
- Fig 37 is a view similar to Figure 36 from another angle of view
- Fig 38 shows a detail of the connector of Fig 24,
- Fig 39 illustrates the assembly of a coil conductor with a tab provided for this purpose on the connector
- Fig 40 is a view similar to Figure 39 for an alternative connector.
- connection device 1 shown in FIG. 1 comprises an insulating support 10 and metal elements 20 carried by this support 10.
- the support 10 is produced in the example considered by molding a thermoplastic material, in a monolithic manner, but the invention is not limited to a particular technique for manufacturing the support and the latter can also be produced by an additive manufacturing technique. or by machining, in a plastic or any other electrically insulating material.
- the support 10 is shown in isolation in Figure 2. It is preferably prefabricated, then the metal elements are placed on it, as shown in Figure 3.
- the support 10 has an incomplete circular shape, and extends around the axis of rotation of the rotor over, for example, more than 270 °.
- the angular opening of the support 10 is for example more than 90 °, as illustrated.
- the support 10 is made with two grooves 12 and 13 separated by a rib 11. The grooves
- the metal elements 20 consist of two elements each comprising an arcuate portion 21 connecting a tab 22 for connection to a conductor of the coil. stator with a lug 23 for connection to a stator power supply bus, a short element without portion 21 and an element with three lugs 22 and a portion 21 but without lug 23.
- the tabs 22 are oriented radially and exit through the openings 15 of the support 10.
- the legs 23 are bent a first time at a right angle at their connection to the arcuate portion 21, then a second time at a right angle radially outwards.
- the metal elements 20 are formed by cutting and bending a plate of an electrically conductive material, preferably copper.
- the total thickness e of the device 1 is for example less than 15 mm, being for example
- Each tab 22 has a groove 26, open radially outwards, intended to receive one or more strands of an electrical conductor from the stator windings.
- the groove 26 is relatively narrow, being elongated in the radial direction. Its width w may correspond to the thickness of the strand or strands intended to be connected, or even be slightly less, so that this or these strands are received with clamping in the lug before they are welded to it.
- the groove 26 can alternatively be wider.
- the groove 26 is formed between two branches 27, of which at least one and better both, preferably have, as illustrated, oblique edges 28 converging inwardly, to facilitate the insertion of the strand or strands between the branches.
- connection tabs 22 there is illustrated the possibility for the connection tabs 22 to have at least one flanged edge 120, formed by a portion bent at right angles to the tab 22.
- the bent portion 120 s' extends axially in the direction opposite to the stator winding.
- the flanged edge 120 is oriented radially, like the tab 22.
- the width of the groove 26 is greater than the thickness of the end E of the conductor engaged inside.
- the conductor is preferably fixed by its flat on the face 121 of the flanged edge turned towards the groove 26.
- the width of the groove 26 corresponds to the height of the flanged edge, minus the thickness of the sheet from which this edge is. realized.
- the latter is formed by cutting the tab 22 and straightening the portion thus cut at right angles, around a folding axis parallel to the longitudinal axis of the tab 22.
- the branches 27 may be of unequal widths, as illustrated. , the branch 27 carrying the flanged edge 120 being able to be wider than the other, as illustrated. All of the tabs 22 having an end as illustrated in FIG. 18 can advantageously be replaced, in examples not shown, by a tab as illustrated in FIG. 20.
- the tab 22 of FIG. 20 only includes the branch 27 carrying the flanged edge. In this case, the tab 22 no longer forms a groove 26 open radially outwards. The presence of the flanged edge nevertheless offers a larger fixing surface than in the case of the example of Figure 18, without a flanged edge. All the examples shown with tabs 22 such as that illustrated in FIG. 18 can be modified with tabs 22 having a flanged edge, according to this variant, not illustrated.
- Figure 5 there is shown an alternative embodiment of the device 1 which differs from the previous one by the presence of additional metal elements 30, called belt, carried by the support 10.
- Each metal belt element 30 has an arcuate portion 31, in the shape of a circular arc, and two tabs 32 at the end, each tab 32 having a shape similar to that of the tabs 22 but with a groove 33 oriented in the circumferential direction.
- This groove 33 is formed between two branches like the legs 22, these branches having oblique edges at the end, converging inwardly.
- the metal belt elements 30 are received in a third groove 16 of the support 10, offset from the other two in the direction of the height and radially more interior, as visible in Figures 5 and 10.
- the bottom of the groove 16 may be radially more interior than rib 1, as can be seen in figure 10.
- the support 10 may have, on one face, a chamfered edge 18, as visible in Figures 5 and 10.
- the total height m of the support 10 may be less than or equal to 20 mm, and for example between 16 and 18 mm
- the device 1 comprises three metal belt elements, each of the same angular extent.
- One of the tabs 32 may protrude from one end of the device 1, as illustrated.
- Each element 30 has at least one tab 32 directed towards a tab 32 of another element 30.
- the elements 30 are preferably made like the elements 20 by cutting a plate of an electrically conductive material such as copper, with the same thickness, for example 3mm.
- This example illustrates the possibility of producing the device 1 with a nut holder 40, shown more particularly in FIG. 7.
- This nut holder 40 has a boss 41 extending from the body in an arc of a circle of the support 10, this boss defining three housings 42 each receiving a nut 43.
- the tabs 23 come to rest on the top of the boss 4L. Screws 44 pass through the part of the tabs 23 resting on the boss 41 and are engaged in the nuts 43.
- the screws 44 are used for fixing a stator power bus connector 50, shown in Figure 11, comprising three terminals 51 intended to be tightened against respective lugs 23 by the screws 44.
- Retaining means may be provided on the support 10 to retain the metallic elements added above.
- These retaining means may include reliefs formed by molding with the rest of the support, for example elastic clamps 50 as illustrated in FIG. 8.
- These clamps 50 each comprise two branches forming between them a groove for receiving the metal element of belt 30, and provided on their opposite faces with teeth which snap onto the arcuate portion of the element, the flat of which is oriented perpendicular to the axis of rotation of the rotor.
- the retaining means can also include snap-fastening reliefs made on the metal elements 20 and / or 30, as illustrated in Figure 9.
- a dough 22 can be made with teeth 55 which hook onto the outer surface of the support 10 after passing through the corresponding opening 15.
- FIG. 12 shows the possibility of providing the support 10 with retaining teeth 58 on which the metal elements 20 snap into place once inserted into the bottom of the grooves 12 or 13.
- the radially inner edge of the elements 20 is held by the teeth 58, at the end of the insertion of the elements 20.
- the teeth 58 can be elastically deformed to allow the latter to be crossed by the element.
- the support 10 can also be made so as to allow the metallic elements to be fitted by sliding in a circumferential direction, as illustrated in FIG. 13.
- At least one groove for receiving the metal elements is open radially outwards, so as to allow passage for the tabs 22.
- Each metal element 20 can be retained in this groove because of its section and that of the groove, chosen to prevent radial outward movement of the metal element, while allowing movement in the circumferential direction.
- the element 20 can be made with a groove and the support 10 with a rib 60 engaged in this groove.
- the element 20 is produced with a return or a rib 62, engaged in a corresponding groove 63 of the support 10.
- the support 10 is made monolithically, as in the examples which have just been described.
- the support 10 can be produced by assembling several pieces of insulating material, in particular of plastic.
- the support 10 comprises two parts 70 and 72 assembled, for example using screws.
- Certain metal elements 20 can be placed between the parts 70 and 72.
- the tabs 23 can be formed in the plane of the elements 20.
- Two elements 20 can have bores 73 which coincide with holes made in the parts 70 and 72 for the passage of fixing screws of two of the terminals of the power bus.
- a third element 20 has a bore 74 and part 72 has a notch 76 for receiving the third terminal of the power bus.
- the stator is preferably three-phase, but the invention is not limited to a particular number of phases.
- stator winding can be "wavy" or the like.
- corrugated winding denotes a winding in which the electrical conductors of the same phase are electrically connected to one another so that the electrical current of the phase flows through the electrical conductors rotating around the machine's rotation axis always in one direction.
- the magnetic circuit of the stator preferably has closed notches.
- each pin can be U-shaped ("U-pin” in English) or straight, being I-shaped (“I-pin” in English).
- the electrical conductors can be introduced into the corresponding notches through one or both axial ends of the machine.
- An I-shaped electrical conductor has two axial ends each placed at one of the axial ends of the stator. It passes through a single notch, and can be welded at each of its axial ends to two other electrical conductors, at the axial ends of the stator.
- a U-shaped electrical conductor has two axial ends both placed at one of the axial ends of the stator. It passes through two different slots, and can be welded at each of its axial ends to two other electrical conductors, on the same side of the stator. The bottom of the U is on the other side of the stator.
- Each electrical conductor can include one or more strands ("wire” or “strand” in English).
- strand we mean the most basic unit for electrical conduction.
- a strand can be of round cross section, we can then speak of "wire”, or flat.
- the flattened strands can be shaped into a pin, for example U or I.
- each notch can include several conductors and / or several strands makes it possible to minimize losses by induced currents, or Joule AC losses, which evolve with the square of the supply frequency, which is particularly advantageous when the operating speed is high.
- the electrical conductors are preferably arranged in a row in the notches.
- row is meant that the electrical conductors are not arranged in the slots in bulk but in an orderly manner. They are stacked in the notches in a non-random manner, being for example arranged in one or more rows of aligned electrical conductors, in particular in the radial and / or circumferential direction.
- the electrical conductors may have a generally rectangular cross section, in particular with rounded edges.
- the circumferential dimension of an electrical conductor may correspond substantially to the width of a notch in the stator.
- a notch may have in its width only one electrical conductor. The width of the notch is measured in its circumferential dimension around the axis of rotation of the machine.
- the electrical conductors can be adjacent to each other by their long sides, the large side still being called “flat”.
- Optimization of the stack can allow a greater quantity of electrical conductors to be placed in the slots and thus obtain a stator of greater power, at constant volume.
- each electrical conductor may include one or more pins, each forming a strand, as explained above.
- all strands of the same electrical conductor can be electrically connected to each other at the exit of the notch.
- the strands electrically connected to each other are placed in short circuit.
- the number of strands electrically connected together may be greater than or equal to 2, being for example between 2 and 12, being for example 3, 4, 6 or 8 strands.
- Several strands can form the same electrical conductor.
- the same electric current of the same phase flows through all strands of the same electrical conductor.
- All the strands of the same electrical conductor can be electrically connected to each other, especially at the exit of the notch.
- All the strands of the same electrical conductor can be electrically connected to each other at each of their two axial ends, in particular at the exit from the notch. They can be electrically connected in parallel.
- each electrical conductor has a single strand. In another embodiment, each electrical conductor has three strands.
- a notch can accommodate two strands, or in a variant six strands, for example distributed between the two electrical conductors.
- a notch has four electrical conductors. Each electrical conductor can have two strands. The notch then accommodates eight strands, distributed between the four electrical conductors.
- the strands can be positioned in the notch so that their circumferential dimension around the axis of rotation of the machine is greater than their radial dimension. Such a configuration allows a reduction in Loucault current losses in the strands.
- a strand may have a width of between 1 and 5 mm, being for example of the order of 2.5 or 3mm.
- the width of a strand is defined as its dimension in the circumferential direction around the axis of rotation of the machine.
- Figure 17 shows a stator 100 equipped with a connection device 1 according to the invention.
- the stator 100 comprises a magnetic circuit comprising notches traversed by windings. These are formed by U or I pins.
- the conductors of the winding are for example multi-stranded and for example each include, as illustrated, three superimposed strands and electrically connected to one another.
- the ends E of the conductors are engaged in the tabs 22 provided for this purpose on the connection device 1.
- the conductors can then be soldered to the tabs by any suitable welding technique, for example by laser welding, or by soldering.
- the stator can be impregnated with resin.
- the ends E of these conductors about to be inserted into the grooves 26 of the tabs 22 intended to receive them.
- the legs 22 have a flanged edge 120, each end E is welded against this flanged edge.
- FIG 19 There is shown in Figure 19 a stator variant equipped with a connection device 1 such as that of Figure 1, without metal belt elements.
- the ends E of the conductors are shown before their insertion into the tabs 22.
- connection lugs 23 with a non-linear arrangement, in this case an arrangement in an arc of a circle of the axes of the passages for the fixing screws of the supply bus terminals.
- the tabs 23 can each have an annular shape around the corresponding passage.
- the connection device according to the invention can be made so as to provide a delta connection, as illustrated in FIG. 23, or a star connection, as illustrated in FIG. 22
- stator has six conductors, the ends E of which are fixed to the connection device according to the invention.
- ends E are on the side opposite to the welds between the stator pins. Among these six ends, three correspond to inputs, and three to phase outputs, which are connected differently depending on whether the assembly is star or delta, as illustrated.
- the three outputs are connected together by a single metal element 20 of the connection device, while in the delta connection, each input is connected to an output by a corresponding metal element 20.
- a variant of connector 1 will now be described with reference to FIGS. 24 to 40.
- This variant comprises four conductive elements 20a to 20d each having a flat portion 21 in the form of an arc of a circle.
- the elements 20a, 20c and 20d carry a tab 23 for connection to the power supply bus at one end.
- the elements 20a to 20d comprise radial extensions 170, which extend in the plane of the corresponding portions 21, and which each connect to a 90 ° bend 171, this bend also extending in the plane of the portion 21 concerned.
- Each bend 171 is extended by a raised portion 172 defining a tab 22.
- the latter is oriented perpendicular to the plane of the portions 21, upwards in FIG. 28, and substantially radially.
- Portions 21 extend over two floors, and partly overlap.
- the element 20c connected to the tab 23 furthest to the right in FIG. 28 has a rectilinear portion 190 which is connected by an elbow 191 to the portion 21 in an arc of a circle.
- the rectilinear portion 190 carries, on its inner edge, near the elbow 191, a tab 243, higher than the others, which is used for mounting a temperature sensor.
- the tabs 23 are connected, in this variant, by a U-shaped portion 251 to the rest of the element 20a, 20c or 20d concerned. Each tab 23 carries a nut 252 crimped in a opening of the tab, allowing a fixing screw to be held for a power bus connection terminal.
- the metal elements are advantageously produced with reliefs allowing their positioning in the mold used for the overmolding of the plastic material of the insulating support 10. At least one of these reliefs may be in the form of an inward projection 195. , formed at the end of the elements 20a and 20c opposite the legs 23.
- Each projection 195 may in particular have an edge 196 extending in the extension of an edge 197 of an extension 170 extending outwardly, as can be seen in FIG. 28 in particular.
- the element 20c can also include a hole 185 between the elbow 191 and the portion 21, near the tab 243, for the passage of a positioning pin in the mold.
- the metallic element 20c widens at the level of the hole, to compensate for the lack of material and to maintain a sufficient conductor section for the passage of current.
- the mold used to make the connector 1 may include pins which clamp the conductive elements, which bear on the main faces of the latter, thus leaving, during demolding, openings 260 visible in FIGS. 32 to 35 in particular .
- the support can be made with pads 270 intended to cooperate with a tool for positioning the connector on the coil, pending the attachment of the strands of the coils to the tabs 22 provided for this purpose.
- the studs 270 do not all have the same height, the stud 270 situated on the portion 280 of the support 10 covering the element 20c where it extends between the elements 20d and 20a being higher, of a height chosen such that its free end is situated substantially in the same plane as that of the other stud 170.
- the support 10 has on its face opposite to the direction in which the tab 243 extends, openings 281 leaving the underlying conductive element visible. These openings 281 are formed during demoulding, corresponding to the presence in the mold of members for holding the conductive elements during the step of injecting the plastic material.
- Each tab 22 carries a piece of solder 290, for example crimped thereon, awaiting the soldering of one end E of a conductor of the stator, as illustrated in FIG. 38.
- To manufacture the conductive elements 20a to 20d one can start by cutting a blank of the conductive element in a copper foil, then fix the nuts 252 and the pieces of solder 290, before bending the blank to form the tabs 22 .
- the end E has a single strand.
- tabs 22 are oriented in the axis of the stator opposite the latter, ie upward in these figures, as is the tab 243. Access to the tabs s 'is facilitated, as well as the process of soldering the ends E of the conductive strands.
- the shape of the metal elements 20 or 30 and that of the support 10 can be modified as a function of the way in which the outputs of the conductors of the coils are arranged.
- the support can be overmolded on all or part of the metal elements.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1902070A FR3093387A1 (fr) | 2019-02-28 | 2019-02-28 | Dispositif de connexion pour stator |
PCT/FR2020/050344 WO2020174166A1 (fr) | 2019-02-28 | 2020-02-24 | Dispositif de connexion pour stator |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3931948A1 true EP3931948A1 (fr) | 2022-01-05 |
Family
ID=67441300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20714266.2A Pending EP3931948A1 (fr) | 2019-02-28 | 2020-02-24 | Dispositif de connexion pour stator |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3931948A1 (fr) |
FR (1) | FR3093387A1 (fr) |
WO (1) | WO2020174166A1 (fr) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1397784B1 (it) | 2010-01-15 | 2013-01-24 | Gate Srl | Collettore per lo statore di un motore brushless in corrente continua a magneti permanenti |
WO2014011811A1 (fr) * | 2012-07-11 | 2014-01-16 | Remy Technologies, Llc | Ensemble de barres omnibus comportant des barres omnibus sur cartes de circuits imprimés |
FR2995472B1 (fr) * | 2012-09-12 | 2015-10-16 | Valeo Equip Electr Moteur | Interconnecteur pour stator de machine electrique, cache isolant, et stator de machine electrique correspondants |
JP5661161B1 (ja) * | 2013-10-07 | 2015-01-28 | 三菱電機株式会社 | 回転電機 |
FR3019398B1 (fr) * | 2014-03-25 | 2017-08-25 | Valeo Equip Electr Moteur | Capteur de temperature pour stator de machine electrique et machine electrique comportant un tel capteur |
US10622864B2 (en) * | 2015-01-22 | 2020-04-14 | Jtekt Corporation | Electric motor unit and drive unit for vehicle |
JP2017208871A (ja) * | 2016-05-16 | 2017-11-24 | Kyb株式会社 | バスバーユニット及び回転電機 |
FR3058283B1 (fr) * | 2016-11-03 | 2020-12-18 | Valeo Equip Electr Moteur | Stator de machine electrique tournante muni d'un interconnecteur a positionnement optimum |
TWI606676B (zh) * | 2017-01-06 | 2017-11-21 | 群光電能科技股份有限公司 | 馬達定子結線固定裝置 |
-
2019
- 2019-02-28 FR FR1902070A patent/FR3093387A1/fr active Pending
-
2020
- 2020-02-24 WO PCT/FR2020/050344 patent/WO2020174166A1/fr unknown
- 2020-02-24 EP EP20714266.2A patent/EP3931948A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020174166A1 (fr) | 2020-09-03 |
FR3093387A1 (fr) | 2020-09-04 |
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