Driving device that is easier to assemble

Abstract

The present invention relates to an assembly for driving a member comprising a polyphase electric machine (100) provided with a stator (110) bearing a plurality of coils (440) and a magnetized rotor (120), and a circuit board (200) comprising the electronic circuit for controlling said polyphase electric machine (100) and bearing multiple connectors (250, 260), characterized in that each of the windings of the coils (440) has two stripped electrical terminations (441, 442) that fan out on the side of the circuit board (200) , and in that - at least some of the proximal terminations (441) are electrically connected, by means of axial terminations (495), through reversible insertion into connection lugs (230), - at least some of the distal terminations (442) are connected directly to each other irreversibly.

Description

Easy-to-assemble training device Technical field of the invention 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. 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 around 12V, 24V or 48V depending on the type of vehicle. For commercial vehicles, the power required to drive these components is in the range of 5kW to 10kW, which for a 24V power supply network represents current levels of several hundred amps. By way of example, but not limited to, such equipment is an oil pump for truck power steering (eHPS: electro-hydraulic power steering) requiring pressures up to 200 bar and flow rates up to 30 L / min. The electrical power involved is 6 kW, with currents at approximately 250 A at 24 V. Such applications relating to the assistance of the steering of a heavy vehicle must be piloted and controlled precisely by control electronics which is integrated directly into the electric machine associating this electronics with a motor consisting of a rotating mobile rotor and a fixed wound stator. 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 The prior art includes patent application DE102015109845A1 concerning a three-phase six-pole electric motor, comprising a stator with a plurality of coils, a permanent magnet rotor, and an electronic control board equipped with power and control connectors (;

[0002] ,

[0018] ,

[0023] ,

[0024] ). Each coil has two bare terminations, directed towards the electronic board. The proximal terminations (internal, air gap side) are connected by insertion into lugs via axial extensions in a reversible manner, to withstand vibration and thermal expansion stresses (

[0024] ). The figures show two opposing coils winding in opposite directions, suggesting a different polarity requiring distinct potentials with no common neutral point at the six distal terminations. Application CN110050405A describes a three-phase electric motor stator comprising several windings inserted into a two-part structure: a slotted inner yoke for retaining the coils, and an insulating outer yoke facilitating assembly. Each winding has two ends, but no description is given on the specific arrangement of the terminations, their connection to an electronic board, or their method of attachment (reversible or irreversible). D2 focuses on the mechanical structure of the stator and the efficiency of the coil assembly, particularly for optimizing winding and magnetic shielding, but does not address the means of electrically connecting the coils or the radial arrangement of the wire ends. US patent application 2020106330A1 describes an electric machine integrated into a drive module, in which the stator has windings connected to a control board via pins passing through an insulating wall (,). The connections between the coils and the electronics are made by conductors forming resilient contacts, intended to dampen thermal and mechanical effects (cf.

[0025] ,

[0040] However, D3 does not specify the differentiated radial arrangement of the two winding ends, nor any direct and irreversible connection between the distal terminations. The figures illustrate wires or pins extended to the board but do not show any star topology or neutral point created by soldering between distal ends. Patent application WO2021155890A1 describes an electric motor with a wound stator whose winding ends are connected to a connection interface, often in the form of an integrated printed circuit board or terminal block, to facilitate assembly and maintenance. The document emphasizes a modular structure and an integrated connector system, including busbars or flexible printed circuit boards, to provide the link between the coils and the power electronics. However, no specific radial arrangement of the terminations is disclosed, and no direct irreversible connection between the distal terminations is mentioned. Patent JP3881520B2 relates to a method of securing winding wires to an insulating plate in an electrical machine. The ends of the coils are inserted into slots in the insulating plate to be held in place and connected to conductive elements, often by soldering. The aim is to ensure stable positioning of the windings and effective insulation. However, the document does not address the radial arrangement of the terminations, their different types of connection (reversible vs. irreversible), or a neutral point formed by direct interconnection of the distal ends. The following patent applications are also known: EP4383524A1 offers a modular coil cooling and integration structure, but does not teach a termination arrangement with radial differentiation or an irreversible connection of distals. EP3258574A1 which proposes a termination structure by omnibus bars or power conductors, but without detail on the internal / external radial arrangement or on the reversible / irreversible differentiation of the connections. JP2019092268A1, which deals with removable contact devices and flexible connectors for rotating machines, with priorities for disassembly, contradicts the teaching of an irreversible connection between distal terminations. JP2015144507A describes a motor integrated into a housing, with cable passages through a partition, but neither illustrates nor claims a radial topology distinct from the terminations nor an irreversible connection mode between the distal ends. JP2015106971A, which focuses primarily on thermal management and stress measurement in a motor, without addressing winding connection aspects CN105471152A) which describes multi-base connector structures, with no relation to a differentiated radial arrangement or irreversible interconnection of distal terminations. Disadvantages of prior art The state of the art offers numerous solutions for making the electrical connection between an electronic control circuit and the stator of an electrical machine. Existing solutions present various drawbacks related to the electrical connection between the wound stator and the electronic control board. Most implement solutions that are either fully reversible, like the solution described in patent application DE102015109845A1, or complex and unrobust, or poorly suited to the requirements of compactness, reliability, or maintenance. Robust solutions capable of transmitting high electrical power and significant current levels are often non-removable, very 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 removable solutions present significant limitations in terms of performance.No prior art solution addresses the challenges of green sustainability by enabling easy assembly and disassembly of the electronic circuit of a high-power electrical machine operating at high currents, while respecting stringent constraints of compactness (avoiding excessive 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, and terminals). Prior art systems either result in high manufacturing costs (multiple connectors, intermediate parts) or increased sensitivity to vibrations and thermal expansion. The present invention aims to overcome the drawbacks 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. To this end, the present invention proposes a drive assembly for an element comprising: a polyphase electric 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 element, as well as connection lugs, each of the windings of said plurality of coils having two electrical terminations extending from said electric 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, by reversible insertion into said connecting lugs. At least some of the distal terminations are directly and irreversibly connected to each other. Optionally, at least some of the proximal terminations are irreversibly connected to an interconnecting bar. Advantageously, the stator of said electrical machine is overmolded to form a sub-assembly inserted into a housing closed by an intercalary plate separating said electrical machine from said electronic board, said intercalary plate comprising a guide support for the shaft of said rotor. Depending on the specific implementation: - said intercalary plate constitutes the bottom of a housing containing said electronic control board. - said electrical coils are made up of the winding of a flat wire, all the windings being two by two contiguous along the radial direction of the stator. - said interconnecting bar is made of a flat wire identical to that of the windings - the intermediate plate has lights ensuring the passage and guidance of the axial terminations inserted reversibly into the connection lugs of the electronic board. The invention also relates to a drive assembly of a component where the stator has: a first part in the form of an inner yoke made up of a multitude of straight teeth joined by a ring connecting the end of the teeth adjoining the inner 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 yoke of annular shape provided to receive the inner yoke, said outer yoke 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. Advantageously: - said inner cylinder head connecting the end of the teeth is made of a ferromagnetic material and has sufficient thickness to ensure magnetic shielding from the flux generated by the magnetized rotor. - the wound stator has 12 electrical windings to form two three-phase sets, 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. - the wound stator has two additional axial terminations for connecting each of the neutral points of the two half-machines to the electronic board. - each phase consists of two adjacent windings. - each phase consists of two diametrically opposed windings. brief description of the figures Other features and advantages of the invention will become apparent from the following detailed examples of embodiments, with reference to the accompanying figures which respectively represent: Figure 1 is an overview of a device according to a first embodiment of the invention; Figure 2 is an exploded view of a device according to a first embodiment of the invention; Figure 3 is an exploded view of the sub-assemblies of a device according to a first embodiment of the invention; Figure 4 is a partial cross-sectional view of a device according to a first embodiment of the invention; Figure 5 is a detailed view of a device according to a first embodiment of the invention; Figure 6 is an overview of the electrical machine of a device according to a first embodiment of the invention; Figure 7 is an overview of a device according to an alternative embodiment of the invention; Figure 8 is an overview of a device according to an alternative embodiment of the invention.This is an overview view of a device according to another alternative embodiment of the invention; This is an exploded view of the stator winding supports of the electric machine according to a preferred embodiment; This is an overview view of the phase connection of the electric machine stator of a device according to a first embodiment of the invention; This is an overview view of the phase connection of the electric machine stator of a device according to a second embodiment of the invention; This is an overview view of the phase connection of the electric machine stator of a device according to a third embodiment of the invention; This is an overview view of the phase connection of the electric machine stator of a device according to a fourth embodiment of the invention.This is an overview of the phase connection of the stator of an electrical machine of a device according to a fifth embodiment of the invention. This is an overview of a device according to an alternative embodiment of the invention. General principle of the invention 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. The first subassembly (1) comprises the electrical and mechanical components 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 around 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. A portion 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. An "irreversible" connection is defined as a bond between proximal terminations and an interconnecting bar that cannot be broken by simple removal, by applying tension, or by elastic deformation of the contacting parts. Examples of an irreversible connection include welding or a "press-fit" connection (a mechanical assembly method where a metal part is inserted into a slightly smaller housing). The connection is held solely by dimensional interference and friction forces, without the use of welding, adhesives, or screws. A press-fit fitting is designed to be permanent: the male part and the female housing are in overlapping pattern (male diameter > female diameter). Disassembly results in plastic deformation (enlargement of the hole, scratches, marking), a loss of mechanical strength if the part is reassembled, or even destruction of the substrate (e.g., printed circuit boards). Therefore, a press-fit fitting is generally considered non-removable. 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 the printed circuit board by reversible terminations, for example of the "pressfit" type (231), and arranged opposite rigid axial terminations (495), electrically and mechanically connected to the proximal terminations of the coils, possibly via an interconnecting bar (493) or an intermediate connector (490). These two subassemblies (1, 2) are electrically connected via rigid axial terminations (495) which engage axially in complementary connecting lugs (230) provided on the second subassembly (2). These engagements are reversible insofar as the axial terminations (495) insert and make contact with the connecting lugs (230) at the level of deformable elastic elements (232) capable of transmitting the high current while allowing disengagement without damage, thus enabling 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), or the axial terminations (495) can extend from an interconnecting bar (493) linking several coils (440) of the same phase. 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. To allow the passage of high currents, the coils (440) are preferably made by winding a solid strip of rectangular copper, with some of the terminations irreversibly connected by an interconnecting bar (493) consisting of an identical strip welded to the terminations to be electrically connected. These interconnecting bars (493) aim to minimize the number of axial terminations (495), down to one axial termination (495) per electrical phase of the motor, and therefore the number of associated connection lugs (230). This minimization is not always desirable depending on the applications for which the motor is intended and, in particular, depending on the associated operational safety requirements. The reversible connection lugs (230) have a metal frame supporting, on one side, 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 side, terminations (231) suitable for electrical connection and its retention on 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 Figure 1 represents an overview of a first embodiment according to the invention. According to this embodiment, the first subassembly (1) integrates 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 integrates 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). Figure 1 represents 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 at 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). The wound stator (110) is advantageously encased 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 both effective mechanical retention and sufficient thermal conduction to dissipate the losses of the stator (110). The housing (130) also incorporates elements (132) for attaching it to the frame, such as threaded holes or mounting lugs. 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 effect sensor. 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 intermediate plate (140) by the contact of their respective axial surfaces (242, 144). The cover (240) also includes a power connector (250), connected to the electronic board (200) through a slot (241), and a signal connector (260). Figure 1 represents 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 connection terminals (not visible) 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 intercalary plate (140) followed by an axial movement of disengaging 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. Figure 1 represents a partial cross-sectional view of the invention according to the first embodiment. The rotor (120) is guided in the intermediate 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's 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 line with 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 between the connecting lugs (220) and the rigid blades (252) of the connector (250), typically in cases of mechanical shocks that may have damaged the connector, allowing for 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. In order to limit and reduce interference and heat exchange between the stator (110) and the electronic board (200), an axial gap is made between the lower surface of the electronic board (200) and the upper surface of the intercalated plate (140), this axial space also being used to accommodate the sensor magnet (123) and all the reversible electrical connections between the electronic board (200) and the wound stator (110) or the connectors (250, 260). Intermediate connectors (490) of the coil terminations (440) of the wound stator (110), detailed in, pass through the spacer 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). Figure 1 represents a detailed view of the invention according to a first embodiment, in which the interlayer plate (140), the housing (130), and the stator overmolding (114) are not 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. Detailed description of the electrical machine and coils Figure 100 represents 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 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. These stator teeth (113) are also adapted to receive 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 current levels 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) detrimental to the machine's performance.For this purpose, the inner cylinder head (112) has a solid cylinder closed over 360° between the permanent magnets (122) and the windings (443) of the coils (440), the cylinder thus acting as a magnetic shielding element limiting the development of the currents induced in the stator (110) by the rotor (120) and contributing to the high level of efficiency of the electric machine (100). 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 connected irreversibly, by laser welding for example, to the intermediate connector (490) itself connected to the electronic board (200) reversibly via the insertion of its axial termination (495) into a connection lug (230); a second proximal termination (441) being electrically connected irreversibly, by laser welding for example, to the interconnection bar (493). Figure 1 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 the insertion and retention of the interconnecting bar (493), so as to achieve a simple and robust electrical connection by laser welding for example. The interconnecting bar (493) is advantageously formed by an alternation of straight sections connected by curved bending zones of a wire of the same cross-section as the flat wires of the windings. In the example shown, two positioning elements (471, 472) are coplanar and provide a bearing surface for the interconnecting bar (493). The third positioning element is parallel to the first two and located in a plane offset by the thickness of the connecting bar (493) to provide a receiving and holding 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). 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. This axial termination is extended laterally by a U-shaped interface zone (491) designed to receive the proximal termination (441) for 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 a third positioning element (483) parallel to and located in a plane offset by the thickness of the conductive strip forming the intermediate connector (490). The intermediate connector (490) can then be held in place by a slight clamping action when inserted 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), spreading out 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 implementation methods The figure 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 from the stator (110) to the electronic board (200), the guide support (145) for the rotor (120), the housing (131) for the stator (110), the mounting elements to the frame (132), as well as the surfaces (133, 144) for interaction with the driven component (3) and with the second sub-assembly (2), are obtained by 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 saves the need for a sealing gasket between the intermediate plate (140) which has become integral with the housing (130). Figure 1 represents an overview of a device according to an alternative embodiment of the invention. The second sub-assembly (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). Figure 1 represents 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). Figure 1 illustrates an overview of a device according to another alternative embodiment of the invention. This embodiment differs from the previous embodiments in that the axial terminations (495), enabling electrical connection in a connection lug (230) of the electronic board, each extend from an interconnecting bar (493) connecting several coils (440) of the same phase by means of their proximal termination (441). The axial terminations (495) can be irreversibly connected to said associated interconnecting bar by soldering, or be directly a folded extension thereof.The example shown illustrates a three-phase motor for which a single axial termination (495) per phase is connected to the electronic board, and for which all the coils (440) of the same phase are connected to the same interconnecting bar (493), but a person skilled in the art could very well consider using several interconnecting bars per phase each equipped with an axial termination, or apply these teachings to a motor equipped with more than 3 phases. Topology of the electrical machine 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. In normal mode, the electrical machine operates in polyphase mode, with a replication of two "half polyphase machines" each corresponding to half of the electrical coils. 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. In particular, this solution is implemented for a three-phase machine, with six coils per half-machine, for a total of 12 coils. 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. Figure 1 represents 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 2; 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 resulting in 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 the same half-machine can either be distributed over the whole of the 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. The solution presented in Figure 1 offers an alternative embodiment that allows for diversifying control strategies in case of a fault. This embodiment differs from the one presented in Figure 2 in that each of the interconnecting busbars (493), forming the neutral point of each of the two three-phase systems, is equipped 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 busbar (493), as illustrated in Figure 3, or can alternatively be an extension of the interconnecting busbar (493) or even a strip of material attached and welded to the connecting busbar (493).This solution allows for a specific control method which, in the event of a failure, isolates only a portion of half a machine, rather than the entire half. This makes it possible to maintain a greater number of control modes in case of failure. Figure 1 represents an overview of a wound stator according to another 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).Connecting the opposing coils in series requires a greater number of interconnecting bars (493) to achieve this configuration, which offers the advantage of better distributing and balancing the magnetic fluxes created by the two three-phase systems. These systems are no longer arranged diametrically opposite (each phase of one half-machine is offset by 180° mechanically from the same phase of the other half-machine, as illustrated) but rather intertwined (a coil of one phase of one half-machine is adjacent to a coil of the same phase of the other half-machine, i.e., offset by 30° mechanically). Consequently, 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 through reduced torque oscillations, better balancing of radial magnetic forces, and improved homogeneity of heat dissipation within the housing. Figure 1 represents an overview of a wound stator according to another embodiment of the invention. The solution illustrated in Figure 2 is similar to the solution illustrated in Figure 3, which is similar to the solution illustrated in Figure 4. An axial termination (494) using a three-phase system allows connection of the neutral point to the electronic control board (200). In an alternative illustrated in Figure 1, 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 six phases is thus electrically connected to the electronic control board (200) via a set of twelve proximal terminations (441). This type of configuration and this solution allow 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 case of failure.

Claims

Drive assembly of 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 of said polyphase electric machine (100) and supporting multiple connectors (250, 260) for the power supply of said electronic board (200), and the communication of control instructions for driving the driven component, as well as connection lugs (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), 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 (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 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.; A drive assembly of an organ according to claim 1 characterized in that at least a part of the proximal terminations (441) are irreversibly connected to an interconnecting bar (493). 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 intercalary plate (140) separating said electrical machine (100) from said electronic board (200). 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). 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 windings (443) being two by two contiguous along the radial direction of the stator. 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). Drive assembly of a component according to the preceding claim characterized in that said interconnecting bar (493) is formed by an alternation of straight sections connected by curved bending zones. 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). 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. 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 of the flux generated by the magnetized rotor (120). Drive assembly of a component according to claim 1 characterized in that the wound stator (110) has 12 electrical windings (443) to form two three-phase assemblies, each of the three-phase assemblies constituting a half-machine, the wound stator having 6 axial terminations (495) for connecting the phases to the electronic board (200). 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). Drive assembly of a component according to claim 11 characterized in that each phase consists of two adjacent windings (443). Drive assembly of a component according to claim 11 characterized in that each phase is made up of two diametrically opposed windings (443).

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