Easy-to-assemble training device

Abstract

The present invention relates to a drive assembly for a component comprising a polyphase electric machine (100) equipped with a stator (110) supporting a plurality of coils (440) and a magnetized rotor (120), and an electronic board (200) comprising the electronic control circuit of said polyphase electric machine (100) and supporting multiple connectors (250, 260) characterized in that each of the windings of the coils (440) has two bare electrical terminations (441, 442) extending on the side of the electronic board (200), and in that at least a part of the proximal terminations (441) are electrically connected, by means of axial terminations (495), by insertion into connection lugs (230) in a reversible manner, at least a part of the distal terminations (442) are directly connected to each other in an irreversible manner. Figure from the summary: Figure 4

Description

Title of the invention: Easy-to-assemble training device Technical field of the invention

[0001] The present invention relates to the field of electrical equipment formed by an electric machine driving a controlled element which sets in motion, for example, a fluid such as oil, water or air in order to produce the level of pressure and flow required by the flow.

[0002] The drive of this type of component, particularly for applications on vehicles, especially when these devices are subject to safety requirements, is generally driven by an electric machine powered by a so-called low voltage of the order of 12V, 24V or 48V depending on the type of vehicle.

[0003] For commercial vehicles, the power involved in driving these components is in the order of 5kW to 10kW, which for a 24V power supply network represents current levels of several hundred amperes.

[0004] By way of non-limiting example, such equipment is an oil pump for truck power steering (eHPS: electro-hydraulic power steering) requiring pressures up to 200 bar for flow rates up to 30 L / min. The electrical power involved is 6 kW for currents at 24 V of approximately 250 A.

[0005] Such applications relating to the assistance of the steering of a heavy vehicle must be piloted and controlled precisely by a control electronic which is integrated directly into the electric machine associating this electronic with a motor consisting of a rotating mobile rotor and a fixed wound stator.

[0006] The realization of this type of electrical machine in an industrial context with significant and high requirements regarding costs, reliability, quality but also and above all green sustainability, induces particular constraints for the transmission of electrical power (and current) from the low voltage supply to the stator coils via the electronic control board. prior art

[0007] In the prior art, numerous solutions are known that implement a stator connected to an electronic control circuit capable of receiving a high level of current.

[0008] Patent WO2009041172A2 describes a stator structure comprising a plurality of teeth, a plurality of coils, a resin-molded portion, a busbar connected to the coils, and a busbar cooling unit, characterized in that each coil has its two ends projecting from the molded portion and in that the busbar connects the projecting ends, the assembly The stator is projecting and cooled by oil injection. This document provides a solution for creating a stator capable of handling high current, but it does not address the connection to an electronic control circuit. The use of oil to cool the coils is clearly problematic, particularly due to the risk of contamination and pollution of any electronic circuit located near the stator, or the complexity (both technical and costly) of creating a hermetically sealed connection between this electronic circuit and the stator.

[0009] Document WO2008153175A1 relates to an insulating member comprising a back surface section, a pair of back surface sections, and a pair of column sections. The back surface section is formed to be placed between a profile coil and the inner circumference surface of the collar of a stator core. The two side surface sections extend from the back surface section to cover the side surfaces on the right-hand side of the teeth and are flexibly formed in opposite directions. The two column sections extend from the back surface section along the back surfaces of the tooth-side end of the coil, while maintaining spaces between the column sections and the side surface sections so as not to interfere with the deformation of the side surface sections.A solution for mounting a winding, capable of receiving a high current, on a stator tooth is provided here, without describing a solution for connecting the stator coils and phases to each other, or describing the electrical connection of the stator to an electronic control circuit.

[0010] WO2017097807A1 is also known, describing an electric motor comprising a connection assembly to a printed circuit board having a conductive insert through which connection holes pass, and a wound assembly having electrical connections terminated by plugs. Although extremely relevant, this solution requires a hole with an insert in the printed circuit board to make the electrical connection with the added electrical plug, which itself connects via pins to the stator's connection plugs.The electrical connection between the circuit and the stator winding requires three components: the printed circuit board insert, the add-on connector, and the stator connector. It also requires the creation of a slot in the printed circuit board, resulting in significant manufacturing and assembly costs and reducing product performance through a thin add-on connector (therefore with limited current capacity) and partially floating (therefore sensitive to vibrations and mechanical wear, and also sensitive to an increase in electrical resistance at the contact points of its two interfaces).

[0011] The prior art also proposes, with document US10404141B2, a system comprising a rotating electrical machine integrating an electronic circuit of The control system consists of a first electrical terminal connected to the electrical machine, and a second terminal positioned on the surface of the electronic circuit and facing the electrical machine in such a way as to reliably contact the second terminal with the electrical machine. This ensures insertion in a preferred direction to secure the contact and prevent any relative movement between the terminals in the anti-insertion direction. Once engaged in the insertion direction, this solution prevents any further disassembly by relative movement in the anti-insertion direction.Thus, the issues related to green sustainability, which require the ability to easily and readily replace defective assemblies (an electronic board that is economically expensive and has a very high carbon footprint due to its production and transport), are not resolved because the rotating electric machine must be discarded if a defect occurs (during poor assembly on the production line: scrap, or during its operation on a vehicle: waste disposal followed by new maintenance).

[0012] Furthermore, patent EP3526858B1 is known, describing a printed circuit board contact and connection device with its manufacturing method. This type of device can be particularly suitable for transmitting significant electrical currents between a stator of an electrical machine and an electronic circuit. Beyond the connection device, the document provides no indication of how to design the stator.

[0013] We finally know of patent CN103318250B, which describes an electrical system for application on electric or combustion engine vehicles, particularly for controlling their steering. The electrical system comprises a first circuit with a first terminal connection and a second circuit connected to the first terminal. The electrical connection here is based on a blade inserted into an elastic terminal. The possibility of offering a compact system is reduced by the numerous electrical circuits stacked one on top of the other in a mezzanine configuration. Furthermore, the possibility of having removable electrical connections to allow for repair by partially replacing only defective parts is not possible due to the elastic movement of the terminal.

[0014] Finally, patent WO2017178207A1 claims a drive device comprising an electric machine with at least one winding and a control unit, the machine winding being connected to the control unit by a movable sliding element or a deformable flexible element. The contact thus created is maintained here solely by unidirectional contact pressure: the contact resistance is therefore necessarily higher than for other technical solutions, inducing a lower current capable of crossing the contact, with the risk of excessive heating. Similarly, the significant sensitivity to vibrations, to Thermal expansion and wear from friction make this solution not robust enough. Disadvantages of prior art

[0015] The state of the art offers numerous solutions for establishing the electrical connection between an electronic control circuit and the stator of an electric machine. Robust solutions capable of transmitting high electrical power and significant current levels are often non-dismountable, very frequently expensive, and complex to assemble, rendering them incapable of meeting the challenges and expectations of green sustainability. Economically attractive solutions, on the other hand, appear insufficiently robust to withstand the constraints and requirements of applications such as commercial vehicles (temperature, vibration, lifespan). The few dismountable solutions present certain limitations in terms of their performance.No prior art solution thus makes it possible to resolve the green sustainability challenges allowing easy assembly and disassembly of the electronic circuit of an electrical machine operating at high power under high currents, while respecting strong constraints of compactness (avoiding too great a distance between the top of the stator windings and the PCB of the electronic circuit) and cost (avoiding expensive intermediate components such as leadframes, plugs, terminals). Description of the invention

[0016] The present invention aims to overcome the disadvantages of the prior art by enabling a simplified, economical, robust and easily disassembled industrial implementation to ensure efficient maintenance of an electrical machine incorporating an electronic control board.

[0017] To this end, the present invention proposes a drive assembly for a component comprising: - a polyphase electrical machine equipped with a stator supporting a plurality of coils and a magnetized rotor, - an electronic board comprising the electronic control circuit of said polyphase electric machine and supporting multiple connectors for the power supply of said electronic board, and the communication of control instructions for driving the driven component, as well as connection terminals - each of the windings of said plurality of coils having two electrical terminations extending from said electrical machine on the side of the electronic board, the first electrical termination, called distal, adjoining the outer radial periphery of the stator assembly; the second electrical termination, called proximal, adjoining the inner radial periphery forming the air gap with the rotor. At least some of the proximal terminations connect electrically, by means of axial terminations, through reversible insertion into said connecting lugs.

[0018] At least some of the distal terminations are directly and irreversibly connected to each other.

[0019] Optionally, at least part of the proximal terminations are irreversibly connected to an interconnecting bar.

[0020] Advantageously, the stator of said electric machine is overmolded to form a sub-assembly inserted in a housing closed by an intercalary plate separating said electric machine from said electronic board, said intercalary plate comprising a guide support for the shaft of said rotor.

[0021] According to alternative embodiments:

[0022] - said interlayer plate constitutes the bottom of a housing containing said card control electronics.

[0023] - said electrical coils are made up of a flat wire wound every windings being two by two contiguous along the radial direction of the stator.

[0024] - said interconnection bar is made by a flat wire identical to that of the windings

[0025] - the intercalated plate has openings ensuring the passage and guidance of axial terminations inserted reversibly into connection lugs of the electronic board.

[0026] The invention also relates to a drive assembly for a component where the stator has: - a first part in the form of an internal yoke consisting of a multitude of straight teeth joined by a ring connecting the end of the teeth adjoining the internal periphery of the stator, the other end of the teeth being free to allow the insertion of coils or to facilitate winding, - and a second part in the form of an outer, annular-shaped cylinder head designed to house the inner cylinder head, said outer cylinder head having a plurality of zones ensuring the guidance of the teeth during the axial insertion of the first part into the second part of the stator.

[0027] Advantageously:

[0028] - said inner cylinder head connecting the end of the teeth is made of a material ferromagnetic and has sufficient thickness to ensure magnetic shielding from the flux generated by the magnetized rotor.

[0029] - the wound stator has 12 electrical windings to form two sets three-phase, each of the three-phase sets constituting a half-machine, the wound stator having 6 axial terminations for connecting the phases to the electronic board.

[0030] - the wound stator has two additional axial connection terminations from each of the neutral points, of the two half-machines, to the electronic board.

[0031] - each phase consists of two adjacent windings.

[0032] - each phase consists of two diametrically opposed windings. brief description of the figures

[0033] Other features and advantages of the invention will become apparent from the following detailed embodiments, with reference to the accompanying figures which respectively represent: 1. Figure 1 is an overview of a device according to a first embodiment of the invention. 2. Figure 2 is an exploded view of a device according to a first embodiment of the invention. 3. [Fig.3] is an exploded view of the sub-assemblies of a device according to a first embodiment of the invention. 4. [Fig.4] is a partial cross-sectional view of a device according to a first embodiment of the invention. 5. Figure 5 is a detailed view of a device according to a first embodiment of the invention. 6. Figure 6 is an overview of the electrical machine of a device according to a first embodiment of the invention. 7. Figure 7 is an overview of a device according to an alternative embodiment of the invention. 8. Figure 8 is an overview of a device according to an alternative embodiment of the invention. 9. Figure 9 is an overview of a device according to another alternative embodiment of the invention. 10. Figure 10 is an exploded detailed view of the stator winding supports of the electric machine according to a preferred embodiment. 11. Figure 11 is an overview of the phase connection of the stator of the electrical machine of a device according to a first embodiment of the invention. 12. Figure 12 is an overview of the phase connection of the stator of the electrical machine of a device according to a second embodiment of the invention. 13. Figure 13 is an overview of the phase connection of the stator of the electrical machine of a device according to a third embodiment of the invention. 14. Figure 14 is an overview of the phase connection of the stator of the electrical machine of a device according to a fourth embodiment of the invention. 15. Figure 15 is an overview of the phase connection of the stator of the electrical machine of a device according to a fifth embodiment of the invention. General principle of the invention

[0034] The drive assembly according to the invention comprises two autonomous sub-assemblies which can be assembled and separated electrically and mechanically in a reversible manner, by axial insertion.

[0035] The first subassembly (1) comprises the electrical and mechanical elements of an electric machine (100), namely a wound stator (110) and a rotor (120) with permanent magnets, as well as the guide supports. This first subassembly (1) comprises a plurality of coils (440) arranged on the periphery of the stator (110), each coil having a proximal termination (441) extending axially and a distal termination (442), the proximal termination being the end of the turn closest to the rotor. Part of the proximal terminations (441) is connected by an interconnecting bar (493) which irreversibly provides the electrical connection for the transmission of high currents, typically more than 100 amperes.

[0036] The second subassembly (2) comprises the control electronics, typically consisting of an electronic board (200) on which power components such as MOSFET transistors are mounted, as well as electronic components such as a position sensor and a microcontroller ensuring the control of the motor phases. This electronic board (200) has on its lower surface connection lugs (230), electrically and mechanically connected to said printed circuit board by reversible terminations, for example of the "pressfit" type (231), and arranged opposite the proximal terminations (441) of the coils not connected by said interconnecting bar (493).

[0037] These two sub-assemblies (1, 2) are electrically connected via rigid axial terminations (495) which engage by axial movement in the complementary connection lugs (230) provided on the second sub- together (2). These engagements are reversible insofar as the axial terminations (495) are inserted and come into contact with the connection lugs (230) at the level of deformable elastic elements (232) capable of transmitting the high current while allowing disengagement without damage, thus allowing several successive engagements and disengagements, typically more than 5. The axial terminations (495) are either directly constituted by some of the proximal terminations (441) of the coils (440) which extend to the electronic board (200), or extensions of multiple intermediate connectors (490) each of which connect electrically, irreversibly, to some of the proximal terminations (441) of the coils (440).

[0038] For the purposes of this patent, "rigid" means that these axial terminations (495) resist transverse deformation when applied against the connecting lugs (230), and do not bend or buckle when pressed against the connector with an axial force.

[0039] To allow the passage of strong currents, the coils (440) are preferably made by winding a massive strip of copper with a rectangular cross-section, with an irreversible connection of some of the terminations by an interconnecting bar (493) made up of an identical strip welded on the terminations to be electrically connected.

[0040] The reversible connection lugs (230) have a metal frame supporting, on the one hand, deformable elastic elements (232), in the form of deformable conductive lips, to allow the insertion of a rectangular strip of material, and on the other hand, terminations (231) suitable for electrical connection and for securing it to an electronic board. The number of deformable elastic elements (232) and terminations (231) is chosen according to the current to be carried through the connectors. detailed description of a method of implementation

[0041] Fig. 1 represents an overview of a first embodiment according to the invention.

[0042] According to this embodiment, the first subassembly (1) incorporates an electrical machine (not visible) and is associated with a control element (3), a pump. It is connected at its upper part to a second subassembly (2) which incorporates an electronic control board (not visible) as well as the electrical interfaces with the application, namely at least one power connector (250) and one signal connector (260).

[0043] Figure 2 shows an exploded view of a first embodiment according to the invention. The electric machine (100) of the first subassembly (1) consists of a wound stator (110) associated with a rotor (120). The wound stator (110) is housed in a first casing (130) closed in its lower part by a cover (150) through which a first guide (152) of the rotor (120) passes, the casing (130) and the cover (150) being brought into contact by their respective axial surfaces (133, 151); the rotor (120) is coupled with a pump (3) and more generally with a component driven by a coupling element (126) capable of transmitting the mechanical power produced by the electric machine (100), the component to be driven (3) being fixed to the cover (150) via a suitable interface (153).

[0044] The wound stator (110) is advantageously enclosed in an overmolding (114) to form a rigid element engaged in the housing (130) at the level of the recess (131) in order to ensure, on the one hand, effective mechanical retention and, on the other hand, thermal conduction capable of dissipating the losses of the stator (110). The housing (130) further incorporates elements for fixing (132) to the frame, such as threaded holes or fixing lugs.

[0045] The upper part of the housing (130) is closed by an interlayer plate (140) by bringing the respective axial surfaces (134, 143) of these two elements into contact. The interlayer plate (140) has a second guide (145) for the rotor, as well as openings (141) for the passage of the axial terminations (495) of the wound stator (110). The interlayer plate (140) also has an opening (142) corresponding to the positioning of a position sensor (123) linked to the rotor (120) in interaction with a sensitive element fixed to the lower surface of the electronic board (200), for example, a Hall sensor.

[0046] The electronic board (200) is housed in a compartment closed by a top cover (240) having cooling fins (243), this top cover (240) being fixed to the interlayer plate (140) by the contact of their respective axial surfaces (242, 144). The cover (240) further includes a power connector (250), connected to the electronic board (200) through a slot (241), and a signal connector (260).

[0047] Figure 3 shows an exploded view of the subassemblies of a device according to a first embodiment. The first subassembly (1), comprising the electric machine (100), interacts in its upper part with the second subassembly (2), comprising the electronic control board (200), at the axial interaction surfaces (144, 242), allowing assembly and disassembly via a reversible electrical connection between the axial terminations (495) and the (not visible) connection lugs of the electronic board. The first subassembly (1) interacts in its lower part with the controlled element (3) at the axial interface surface (153) to transmit mechanical power to it via the transmission element (126).Thus, in a green sustainability approach, it is easy to replace, as a non-limiting example, the possibly defective sub-assembly (2) by a simple operation of unscrewing the cover (242) to release. the intercalated plate (140) followed by an axial movement of disengagement of the reversible electrical connections, consisting of the axial terminations (495) and the connection lugs, the next operation consisting of reassembling a new sub-assembly (2) solving the failure encountered.

[0048] Figure 4 shows a partial cross-sectional view of the invention according to the first embodiment. The rotor (120) is guided in the interlayer plate (140) via a bearing (124). The MOSFET-type power transistors (210) mounted on the electronic board (200) are thermally coupled to the cover (240) by thermal paste (211) in order to efficiently dissipate losses by conduction and then by convection through the fins (243) of the cover (240). Advantageously, and without limitation, the power transistors (210) are of the "Top Cooled" type: the heat dissipation of their losses is ensured by the upper part of the component housing, which is thus assembled on the upper surface of the electronic board (200) so as to face and be close to the cover (240) and the finned dissipation areas (243). The power connector (250), fixed to the cover (240), is connected to the electronic board (200).In its upper part, the connector (250) has a first blade (251) adapted to connect electrically to the application to receive power from the battery. In its lower part, it has a second blade (252) electrically connected to a connection lug (220). This connection lug (220) has a structure similar to the connection lugs (230) that provide the electrical connection between the electronic board (200) and the stator (110), namely a metal frame supporting, on one side, deformable elastic elements (222), in the form of deformable conductive lips, to allow the insertion of a rectangular strip of material, and on the other side, terminations (221) adapted for electrical connection and retention on an electronic board. The size and cross-section of the connector (250) are adapted to the current to be transmitted directly from the main power supply.In a green sustainability approach, it is also easy to replace only the power connector (250) of the sub-assembly (2) thanks to the reversible electrical connection made between the connection lugs (220) and the rigid blades (252) of the connector (250), typically in the event of mechanical shocks that may have damaged the connector, allowing for its replacement with a new one. The added value of the product is thus preserved and the environmental impact significantly reduced by eliminating a number of waste products.

[0049] In order to limit and reduce interference and heat exchange between the stator (110) and the electronic board (200), an axial gap is provided between the lower surface of the electronic board (200) and the upper surface of the interlayer plate (140), this axial space also being used to accommodate the sensor magnet (123) and all reversible electrical connections between the electronic board (200) and the wound stator (110) or the connectors (250, 260).

[0050] Intermediate connectors (490) of the coil terminations (440) of the wound stator (110), detailed in [Fig. 10], pass through the interlayer plate (140) at the slots (141). The plastic overmolding (114) of the stator encloses the intermediate connectors (490) and the axial terminations of the coils (440) in this passage area to ensure precise guidance by fitting with the cross-section of the slots (141), thus ensuring efficient centering and positioning of the intermediate connectors (490) to allow the insertion of the axial terminations (495) into the connection lugs (230) of the electronic board (200).

[0051] Figure 5 shows a detailed view of the invention according to a first embodiment, the interlayer plate (140), the housing (130), and the stator overmolding (114) not being visible. The power connector (250) is electrically and reversibly connected to the electronic board (200) by a set of two connection lugs (220): one for voltage (positive terminal) and the other for ground (negative terminal). The wound stator (110) is connected to the electronic board (200) by a set of six connection lugs (230), only four of which are visible in the figure.

[0052] Detailed description of the electrical machine and coils

[0053] Figure 6 shows a detailed view of the electrical machine of the invention according to a first embodiment. The electrical machine (100) comprises an internal rotor (120) made up of a lamination (121) and a set of permanent magnets (122) integrated into the lamination (121). The wound stator (110) comprises a lamination consisting of an outer yoke (111) of annular shape, which fits into the housing (131) of the casing (130); and a complementary inner yoke (112) consisting of a ring, the inner surface of which forms a cylinder concentric with the rotor, and from which teeth (113) radiate radially towards the outer yoke (111), the inner yoke having a star shape. The said stator teeth (113) are also suitable for receiving the wound assemblies and coils (440).The windings (443) of the coils (440) are made of rectangular metal wire with a cross-section large enough to withstand the high currents flowing through them. The relative movement of the permanent magnets (122) due to the rotation of the rotor (120) in the immediate vicinity of the coils (440) can generate induced currents which, given the large cross-section of the windings (443), can develop and cause significant losses (known as AC copper losses and Joule heating losses that slow the rotor's movement), which are detrimental to the machine's performance. To mitigate this, the inner yoke (112) has a solid cylinder that is closed over 360° between the permanent magnets (122) and the windings (443) of the coils (440), the cylinder thus acting as a shielding element. magnetic limiting the development of currents induced in the stator (110) by the rotor (120) and contributing to the high level of efficiency of the electric machine (100).

[0054] The coils (440) are supported by a coil body (400) preferably, but not exclusively, made of plastic. The windings (443) of all the coils (440) are identical, although the coils (440) may differ in their proximal (441) and distal (442) terminations. Adjacent coils are irreversibly electrically connected to each other via the distal terminations (442) by means of, for example, laser welding.The pair of coils thus formed has a first proximal termination (441) electrically irreversibly connected, for example by laser welding, to the intermediate connector (490) itself reversibly connected to the electronic board (200) via the insertion of its axial termination (495) into a connection lug (230); a second proximal termination (441) being electrically irreversibly connected, for example by laser welding, to the interconnecting bar (493).

[0055] Figure 10 shows an exploded view of a wound assembly according to a first embodiment of the invention. The windings (443) of the coil (440) are supported by a coil body (400) that is identical for all the coils (440) constituting the wound stator (110). The coils are preferably wound on a suitable support and then inserted onto the coil bodies (400). The coil body (400) has a base (460) connected to a central core (410). The central core (410) is hollowed out in a shape complementary to the stator teeth (113) to allow their insertion and retention without risk of damaging the windings (443).To hold the reel (440) in place, the reel body (400) is provided with deformable tabs (421, 422, 423, 424) whose length is adapted to the local winding depth (443). Each end of said deformable tabs is provided with a shoulder (431, 432, 433, 434) capable of engaging by the elastic effect of said tabs and holding the reel in position against the base (460). The reel body (400) is also provided with centering elements (451, 452) capable of precisely positioning the reel (440), and therefore its proximal (441) and distal (442) ends. In order to perfect the positioning of the proximal (441) and distal (442) terminations, the base (460) of the coil body (400) has at its upper axial end, a means of positioning and guiding (470).This guiding means (470) has a first set of positioning elements (471, 472, 473), in the form of tabs, for inserting and holding the interconnecting bar (493), so as to achieve a simple and robust electrical connection by laser welding, for example. In the example shown, two positioning elements (471, 472) are coplanar. and provide a support surface for the interconnecting bar (493), the third positioning element being parallel to the first two and located in a plane offset by the thickness of the connecting bar (493) to provide it with a reception and retention area. The positioning elements (471, 472, 473) have an axial extent equivalent to the thickness of the rectangular flat wire constituting the interconnecting bar (493).The third guide element (473) has ribs on its face facing the coil (440) to provide a bearing area for the interconnecting bar (493). The interconnecting bar can therefore either be inserted into the receiving area located between the three positioning elements (471, 472, 473) to ensure its guidance and retention, or be pressed against the surface of the third guide element (473) facing the coil (440) for connection to a proximal end (441) of the coil (440) via the intermediate connector (490). The guide means (470) also has a second set of positioning elements (480, 481, 482), in the form of tabs, to ensure the guidance and retention of the intermediate connector (490).

[0056] The intermediate connector (490) consists of a cut and folded conductive strip. The connector has an axial termination (495) for insertion into the connection lugs (230) of the electronic board, extended laterally by a U-shaped folded interface area (491) designed to receive the proximal termination (441) to ensure its irreversible electrical connection, for example, by laser welding. Similar to the first set of positioning elements, the second set of positioning elements consists of two coplanar positioning elements (481, 482), with the third positioning element (483) being parallel and located in a plane offset by the thickness of the conductive strip constituting the intermediate connector (490). The intermediate connector (490) can then be held in place by slight wedging through insertion into the second set of positioning elements.In order to perfect its lateral positioning, the intermediate connector has, on the one hand, at the lower end of the axial termination (495) a notch (492) cooperating with a protrusion (483) of the guiding means (470), extending between the positioning elements (480, 481, 482); and on the other hand the positioning element (481) has a radial extension, to offer a lateral stopping surface to the intermediate connector. Description of alternative embodiments

[0057] Figure 7 represents a device according to an alternative embodiment of the invention. For the purposes of technical simplification and cost reduction, the first housing (130) and the intermediate plate (140) are made from a single housing. The guide and passage slots (141) for the electrical connections of the The stator (110) to the electronic board (200), the rotor (120) guide support (145), the stator (110) housing (131), the frame mounting elements (132), and the interaction surfaces (133, 144) with the driven component (3) and with the second sub-assembly (2) are obtained through a single, fast, and precise machining operation, thus reducing production and assembly costs and improving manufacturing tolerances, particularly for the positioning and guiding elements. This embodiment also eliminates the need for a seal between the intermediate plate (140), which is now integral with the housing (130).

[0058] Figure 8 shows an overview of a device according to an alternative embodiment of the invention. The second subassembly (2) includes two power connectors (250) in order, on the one hand, to compensate for a possible failure of the power supply via redundancy, and on the other hand, to reduce (divide by a factor of 2) the current level to be transmitted by the connector, thus allowing the use of smaller, less bulky and less expensive connection lugs (220) from the power connector (250) to the electronic board (200).

[0059] Figure 9 shows an overview of a device according to another alternative embodiment of the invention. The single power connector (250) is in the form of a pair of screw terminals, one for the voltage (positive terminal) and the other for the ground line (negative terminal). The means for attaching it to the frame are located on the lower cover (150) in the form of mounting lugs (154). Topology of the electrical machine

[0060] In general, the motor according to the invention is configured to allow a degraded operating mode without requiring physical modification, by a simple change in the control mode which can be automatically controlled in the event of detection of a failure.

[0061] In normal mode, the electric machine operates in polyphase mode, with a replication of two "half polyphase machines" each corresponding to half of the electric coils.

[0062] In the event of a failure, by a short circuit on a coil (440) or on a power transistor (210) or on an electronic component for example, the electrical machine can continue to operate in degraded mode by isolating one of the half-machines, that is to say by short-circuiting all the phases of the affected half-machine or by opening the phases concerned.

[0063] In particular, this solution is implemented for a three-phase machine, with six coils per half-machine, i.e., 12 coils in total. Each phase of a half-machine consists of two electrical coils. Various possible combinations are detailed in Figures 11 to 13, without limiting the invention.

[0064] Figure 11 shows an overview of a wound stator (110) according to an alternative embodiment of the invention. The configuration of the wound stator (110) is very close to the preferred embodiment described in Figure 6. This alternative embodiment differs in the electrical connection between the wound stator (110) and the electronic control board (200) insofar as the intermediate connectors (490) are eliminated. In fact, the proximal terminations (441) of the coils (440) engage and insert directly into the connection lugs (230) in a reversible manner. The interconnection of the 12 coils (440) produces a two-by-three-phase system inducing a total of 6 connection points via 6 proximal terminations (441) with the electronic board (200), the coils (440) operating in adjacent pairs connected in series via the distal terminations (442).The neutral point of each of the two three-phase systems is achieved by means of an interconnecting busbar (493) that irreversibly connects three pairs of coils (440), for example, by laser welding. The two interconnecting busbars (493) are electrically insulated and guided by positioning elements (471, 472) integrated into the coil bodies (400). The interconnecting busbars (493) are made of the same flat wire as the windings (443) of the coils (440). In this embodiment, the electrical phases of two half-machines are formed by the combination of two adjacent coils. The electrical phases of the same type belonging to each half-machine are diametrically opposed, or alternatively, they are separated by a mechanical angle of 180°.The three electrical phases of a single half-machine can either be distributed over the entire electrical machine, and therefore be spaced at a mechanical angle of 30°, to provide a better distribution of magnetic forces, or be adjacent and contained within a mechanical angle of 180°, and therefore be spaced at a mechanical angle of 60°, so as to provide better magnetic decoupling between the two half-machines.

[0065] The solution presented in [Fig. 12] offers an alternative embodiment that allows for diversifying control strategies in case of a fault. This embodiment differs from the embodiment presented in [Fig. 11] in that each of the interconnecting bars (493), forming the neutral point of each of the two three-phase systems, is provided with an axial termination (494) extending identically to the other proximal terminations (441) so as to allow the connection of the neutral point of each three-phase system to the electronic board (200). These axial terminations can be proximal terminations (441) of a coil (440) electrically connected to the interconnecting bar (493), as illustrated in [Fig. 12], or can alternatively be an extension of the interconnecting bar (493) or even a strip of material added and welded to the connecting bar (493).This solution allows for a specific control system consisting, in the event of a failure, of isolating one. only part of a half-machine, and not the entire half-machine. This allows for a greater number of control modes to be maintained in case of failure.

[0066] Figure 13 shows an overview of a stator wound according to another variant embodiment of the invention. The interconnection of the 12 coils (440) produces a two-by-three-phase system inducing a total of 6 connection points via 6 proximal terminations (441) with the electronic board (200), the coils (440) operating in opposite pairs connected in series via the distal terminations (442). The series connection of the opposite coils requires a larger number of interconnecting bars (493) to achieve this configuration which brings the advantage of better distributing and balancing the magnetic fluxes created by the two three-phase systems which are thus no longer arranged in a diametrically opposite way (each phase of one half-machine offset by 180° mechanically with respect to the same phase of the other half-machine, as illustrated in [Fig. 11]) but in an entangled way (a coil of one phase of one half-machine being adjacent to a coil of the same phase of the other half-machine, i.e. offset by 30° mechanically).In fact, in the event of a failure, the healthy three-phase system, which continues to operate, is distributed homogeneously with respect to the rotor, limiting performance losses by reducing torque oscillations, by better balancing of radial magnetic forces and by better homogeneity of heat dissipation in the casing.

[0067] Figure 14 shows an overview of a stator wound according to another variant embodiment of the invention. The solution illustrated in [Fig. 14] is to the solution illustrated in [Fig. 13] what the solution illustrated in [Fig. 12] is, mutatis mutandis, to the solution illustrated in [Fig. 11]. An axial termination (494) by three-phase system allows the connection of the neutral point to the electronic control board (200).

[0068] In an alternative illustrated by [Fig. 15], the pairs of adjacent coils (440) irreversibly connected at the distal terminations (442) are no longer linked by an interconnecting busbar (493). A set of 6 phases is thus electrically connected to the electronic control board (200) via a set of 12 proximal terminations (441). This type of configuration and this solution allows for a specific control method which, in the event of a failure, isolates only the phase corresponding to the coil pair affected by the failure. It is therefore possible to maintain a greater number of control modes in the event of a failure.

Claims

Demands

1. A drive assembly for a component comprising: - a polyphase electric machine (100) equipped with a stator (110) supporting a plurality of coils (440) and a magnetized rotor (120), - an electronic board (200) comprising the electronic control circuit for said polyphase electric machine (100) and supporting multiple connectors (250, 260) for supplying power to said electronic board (200), and for communicating control instructions for driving the driven component, as well as connection terminals (230) characterized in that each of the windings of said plurality of coils (440) has two bare electrical terminations (441, 442) extending from said electric machine (100) on the side of the electronic board (200), the first electrical termination (442), referred to as the distal termination, being adjacent to the outer radial periphery of the assembly stator;the second electrical termination, called proximal, adjoining the inner radial periphery forming the air gap with the rotor (120), and characterized in that - at least a part of the proximal terminations (441) are electrically connected, by means of axial terminations (495), by insertion into said connecting lugs (230) in a reversible manner, - at least a part of the distal terminations (442) are directly connected to each other in an irreversible manner.;

2. A drive assembly of an organ according to claim 1 characterized in that at least a portion of the proximal terminations (441) are irreversibly connected to an interconnecting bar (493).

3. A drive assembly of a component according to claim 1 characterized in that the stator (110) of said electrical machine (100) is overmolded to form a sub-assembly (1) inserted into a housing (130) closed by an interlayer plate (140) separating said electrical machine (100) from said electronic board (200).

4. A drive assembly of a component according to the preceding claim characterized in that said intermediate plate (140) constitutes the bottom of a housing containing said electronic control card (200).

5. A drive assembly of a component according to claim 1 characterized in that said electrical coils (440) are constituted by the winding of a flat wire, all the windings (443) being two by two contiguous along the radial direction of the stator.

6. A drive assembly of a component according to the preceding claim characterized in that said interconnecting bar (493) is made of a flat wire identical to that of the windings (443).

7. A drive assembly of a component according to claim 1 characterized in that the intermediate plate (140) has openings (141) ensuring the passage and guidance of the axial terminations (495) inserted reversibly into connection lugs (230) of the electronic board (200).

8. A drive assembly for a component according to claim 1 characterized in that the stator (110) has: - a first part in the form of an inner yoke (112) made up of a multitude of straight teeth (113) joined by a ring connecting the end of the teeth adjoining the inner periphery of the stator, the other end of the teeth (113) being free to allow the insertion of the coils (440) or to facilitate winding, - and a second part in the form of an outer yoke (111) of annular shape provided to receive the inner yoke (112), said outer yoke (111) having a plurality of zones ensuring the guidance of the teeth during the axial insertion of the first part into the second part of the stator.

9. A drive assembly of a component according to the preceding claim characterized in that said inner cylinder head (112) connecting the end of the teeth (113) is made of a ferromagnetic material and has a thickness sufficient to ensure magnetic shielding from the flux generated by the magnetized rotor (120).

10. A drive assembly for a component according to claim 1, characterized in that the wound stator (110) has 12 windings (443) electrical to form two three-phase sets, each of the three-phase sets constituting a half-machine, the wound stator having 6 axial terminations (495) for connecting the phases to the electronic board (200).

11. A drive assembly of a component according to the preceding claim characterized in that the wound stator (110) has two additional axial terminations (495) for connecting each of the neutral points of the two half-machines to the electronic board (200).

12. A drive assembly of a component according to claim 9 characterized in that each phase consists of two adjacent windings (443).

13. A drive assembly of a component according to claim 9 characterized in that each phase is made up of two diametrically opposed windings (443).