Improved assembly electric motor

Abstract

The invention relates to an electric motor comprising a rotor (200) and a stator (100) having a plurality of coils (130) interconnected with an electronic board (400) in a sealed area, said electronic board (400) being housed in a compartment separated from the stator coils on the one hand and from the rotor on the other by a transverse partition (151) or a transverse piece (300), characterized in that said coils (130) are mounted on an annular stator support (150), said stator support (150) or said transverse piece (300) having a front annular partition (160), said front annular partition (160) separating a first space in which said coils (130) are located, and a second space formed by a sealed chamber (170) in which the inter-coil connections are located, said front annular partition (160) being radially traversed by the wire pairs (131) of the said coils (130). Abbreviated figure: 2

Description

Title of the invention: Electric motor with improved assembly Field of invention

[0001] The present invention relates to the field of electric motors, and in particular electric motors for fans.

[0002] For certain applications likely to subject the engine to an aggressive environment laden with moisture and / or particles, it is necessary to preserve the electrical connections and bare live parts by protecting them in a sealed space. With the arrival of high-voltage power supplies, particularly in the automotive sector, where standard supply voltages can be 400 volts or even 800 volts, this problem becomes particularly important because the presence of moisture or conductive particles can result in the formation of electric arcs causing serious damage to the electrical connections, or even local destruction or fire risks.

[0003] For this reason, it has been proposed in the prior art to separate the space containing the motor components, namely the magnetized rotor and the stator coils, and a sealed space where the electronic components, the printed circuits and the electrical connections are housed. Different solutions have been proposed to ensure the sealing of this connection area. State of the art

[0004] Known in particular in the state of the art is patent application WO2013037453A2 which relates to an electric motor, in particular a radiator fan motor of a motor vehicle, comprising a rotor (8) rotatably mounted relative to a stator (6) and a motor support (13) provided with an electronics compartment (14) intended to receive an electronic converter system (15), as well as an electronics compartment cover (16), which has a peripheral sealing groove (26) in which the peripheral edge (22) of the electronics compartment (14) provided with a corresponding sealing element (25) engages, in order to achieve a reliable sealed closure of the electronics compartment (14).

[0005] Utility model DE202013012219U1 describes an electric motor, in particular a radiator fan motor for a motor vehicle, with a rotor rotatably mounted relative to a stator, and having a motor support comprising an electronics compartment closed by a cover. An electronic card is arranged in the electronics compartment and the electronics compartment cover is connected to the motor support by means of an anchor hook and a hook nose comprising a connection.

[0006] The solutions of the prior art are not entirely satisfactory because they provide either for sealing the complete motor assembly and therefore pose a problem for cooling the coils, or for placing only the electronic card in a sealed compartment and therefore sealing the rigid and discrete conductors connecting it to the phases of the winding.

[0007] These sealing means are provided axially, which complicates manufacturing because the output wire of the coil is floating, that is to say with a free end, which must be "pushed" through a sealing joint, which represents an operation which is difficult to carry out industrially at high speeds.

[0008] Furthermore, we propose a multiplication of the passages between the two spaces, and therefore the risk of loss of sealing in the event of deterioration of one of the sealing joints, the discrete solutions of the prior art are therefore not satisfactory with regard to their industrialization because of the multiplication of manual operations. Solution provided by the invention

[0009] The object of the present invention is to remedy these drawbacks and relates, in its most general sense, to an electric motor comprising a rotor and a stator comprising a plurality of coils interconnected with an electronic card in a sealed area, said electronic card being housed in a compartment separated from the coils of the stator on the one hand and from the rotor on the other hand by a transverse partition or a transverse part,

[0010] characterized in that • said coils are mounted on an annular stator support, • said stator support or said transverse part having a frontal annular partition, • said frontal annular partition separating a first space in which said coils are located, and a second space formed by a sealed chamber in which the inter-coil connections are located, • said frontal annular partition being crossed radially by the pairs of wires of said coils.

[0011] In a particular embodiment, said frontal annular partition is an extension of said stator support, and is closed by a transverse partition to form the chamber.

[0012] Furthermore, said annular partition is associated with a deformable seal to provide the sealed radial passage of said pairs of wires.

[0013] In particular, said annular partition has two rings defining between them an annular groove in which said deformable seal is housed, said rings being provided with slots for the passage of said wires.

[0014] In a variant, said deformable seal is an O-ring having a part lower formed of two coaxial lips, coming astride said peripheral crown, one of the lips being inserted into the annular groove.

[0015] More particularly, said toric part is also provided with indentation slots covering the sides of the slots of the crown, said indentation slots being narrower than the wires to force a deformation of the toric part at the time of insertion of the wires.

[0016] Even more particularly, the bottom of said slots of the crown has a projection to form a stop during the axial insertion of said wires through the slots.

[0017] In one variant at least one complementary annular seal is associated with said deformable seal to close the passage of said wires.

[0018] In particular, the rotor is housed within the stator.

[0019] In this case, the stator support produces coil bodies by overmolding the stator teeth.

[0020] In particular, the coils are produced by winding the wires directly onto said coil bodies of the stator support.

[0021] Furthermore, the magnetic body of the stator consists of the assembly of the teeth with a stator crown, the whole being secured by means of the stator support.

[0022] Alternatively, the stator is housed inside the rotor.

[0023] The invention also relates to a method of manufacturing an electric motor integrating one or a combination of the preceding characteristics for which all the coils are produced sequentially and without interruption of the wire between two coils.

[0024] Detailed description of a non-limiting example of embodiment

[0025] The present invention will be better understood on reading the following description, concerning a non-limiting example of embodiment illustrated by the appended drawings where:

[0026] [Fig.l] [Fig.l] represents an exploded view of an exemplary embodiment of an engine according to the invention,

[0027] [Fig.2] [Fig.2] represents a detailed perspective view of the wound stator of said engine,

[0028] [Fig.3] [Fig.3] represents a detailed perspective view of the coil support overmolding the teeth of said stator,

[0029] [Fig.4] [Fig.4] represents a perspective and sectional view of the support of coils overmolding the teeth of said stator,

[0030] [Fig.5] [Fig.5] represents a perspective view of the stator before assembly of the crown,

[0031] [Fig.6] [Fig.6] represents a sectional view of said engine,

[0032] [Fig.7] [Fig.7] represents a detailed view, in perspective, of the passage of the wires of the reels,

[0033] [Fig-8] [Fig.8] represents another detailed view of the passage, in perspective, of the coil wires,

[0034] [Fig.9] [Fig.9] represents a perspective view in section of the rotor assembly,

[0035] [Fig. 10] [Fig. 10] represents a detailed view of the rotor assembly showing the mounting of a bearing in the rotor yoke,

[0036] [Fig. 11] [Fig. 11] represents a sectional view of an engine according to the invention and its propeller,

[0037] [Fig. 12] [Fig. 12] represents a view of an alternative embodiment of the electrical circuit without lugs for soldering the coil wires.

[0038] [Fig. 13] [Fig. 13] represents a schematic view of another embodiment variant with an external rotor

[0039] [Fig. 14] [Fig. 14] represents a schematic view of another variant embodiment with a housing for the electronic card integrated in the stator General principle of the invention

[0040] The embodiment described relates to an electric motor used for forced ventilation functions, and particularly that of polyphase motors with electronic commutation with pilot control integrated into the motor housing and coils exposed to the air flow to allow optimal cooling, while sealingly protecting the connection portions and the electronic pilot device, so as to avoid short circuits during immersion, if necessary.

[0041] The solution that is the subject of the present invention is particularly interesting for the construction of a high-power ventilation motor (greater than 1 KW) used for cooling the components of a fast-charging device for an electric vehicle, but it can be used for any type of ventilation drive motor or pump with integrated electronics, making it possible to benefit from the fluid flow to cool the stator coils located in the space exposed to the air flow without risk of contamination for the sealed areas facing the external environment. It is also possible to create a sealed area that encompasses the rotor to guarantee reinforced protection by taking advantage of the overmolding of the stator, by adding a part that closes this cavity and which can also serve as a rotor guide.

[0042] The invention is distinguished in particular by the embodiment of the sealed closure zone at the level of the insulated winding wires, so as to ensure that no stripped zone can be exposed to projections or to water intrusion during the immersion phase of the motor. It is then possible to have windings exposed to the air flow to best evacuate the heat produced by the iron losses and copper losses of the motor, without risking a short circuit.

[0043] It should be noted that the two sealed spaces, the one containing the connection portions and the one containing the electronic control device, may have passages from one to the other through the wall of the housing because this does not compromise the protection of all the sensitive elements located inside one or other of these spaces.

[0044] Detailed description of an exemplary embodiment with an internal rotor

[0045] Figures 1 to 10 illustrate a non-limiting exemplary embodiment described in detail below.

[0046] [Fig.l] represents an exploded view of the engine, without its propeller. It is made up of: - a rotor (200), - a stator (100), - a transverse part (300), for example a metal part, in particular made of aluminum, - a printed electronic card (400), - a closing cover (500). Detailed description of the stator (100)

[0047] Figures 2 and 5 show a detailed view of the stator (100). It is constituted by a stator support (150) more particularly shown by Figures 3 and 4, and a stator crown (110) formed by a pack of sheets each having an annular cutout, [Fig.5] showing the stator before assembly of the stator crown (110) on the stator support (150).

[0048] The stator support (150) is constituted by an overmolding, by injection of a plastic material, of a set of radial teeth (120) also formed by a pack of sheets. This overmolding makes it possible to constitute spaces, called coil bodies (140), making it possible to produce the winding generating the magnetic field interacting with the rotor (200). Said coil bodies (140) extend radially from an annular envelope (141), the inner surface of which is coplanar with the front of the teeth (120) and which extends axially on either side of the teeth over the desired coil height so as to provide a frontal support zone for the wires of the coils (130). In its internal part, said annular envelope (141) defines a receiving cavity (158) of the rotor visible in [Fig.4].The radial extension of the coil bodies is along the teeth (120) with a minimum thickness making it possible to maximize the space intended for the coils (130) while ensuring electrical insulation between the coils (130) and the stack of sheet metal of the teeth (120). The coil bodies (140) are extended at their outer end by an annular sector (142), adjoining the outer surface of the teeth (120), and of the same axial extent as the annular envelope (141) so as to provide distal support for the wires of the coils (130). The peripheral annular sectors (142) are not contiguous between the . teeth (120), but leave a free angular sector (143) to facilitate the path of the needle during the winding operation. In an advantageous configuration, visible in [Fig.3], these coil bodies (140) are striated so as to guide the wires and facilitate winding, this is particularly interesting in the case of winding wires of large section and therefore of great rigidity.

[0049] The annular sectors (142) of the coil bodies (140) are radially extended in their upper part by U-shaped protrusions (145) whose legs extend in the direction of the teeth. Some of these protrusions (145) are provided with flexible extensions (156) extending axially beyond the opposite end of the teeth, these flexible extensions (156) being terminated by hooks so as to ensure the retention by clips of the stator crown once the latter is assembled to the stator support (150).

[0050] As shown in [Fig.5], the stator ring (110) is put in place by an axial insertion, so that the outer surface of the teeth (120) comes into mechanical and magnetic contact with the inner surface of the stator ring (110) to ensure the closure of the magnetic flux. The stator ring is then held in position by the flexible extensions (156).

[0051] In a direction opposite to the extension of said flexible extensions (156), part or all of the protrusions (145) have a protuberance (157) ensuring the connection by rolling with the transverse part (300).

[0052] More visible in Figures 3 and 4, the stator support (150) has an inner core closed by a transverse partition (151) crossed by an axial passage (152). This axial passage (152) is crossed by a central shaft (350) intended for guiding the rotor (200). A housing (153) is provided to receive an O-ring seal (220) of the “O Ring™” type to seal the upper part in a sealed manner. The central shaft is fixedly mounted in a guide nose (330) of the transverse part (300), this guide nose (330) being inserted into the axial passage (152) during assembly of the transverse part (300) on the stator support (150).

[0053] The upper surface of the transverse partition (151) has protrusions (154) constituting plastic rivets for fixing by plastic riveting of the inter-coil connection tracks (610, 620, 630) which will be detailed below. Protrusions (155) having a tapped hole are intended to receive screws for fixing the transverse part (300).

[0054] The transverse partition (151) is surrounded at its periphery by a frontal annular partition (160) extending perpendicular to its surface to form a sealed chamber (170) in which the inter-coil connections and the stripped areas of the wires are enclosed, while the wire outside this chamber (170) is always insulated and continuous.

[0055] Detailed description of the annular partition (160)

[0056] The front annular partition (160) provides a sealed passage function for the pairs of wires extending radially from the coils (130) to reach the sealed chamber (170). In the general case, each coil has a pair of wires passing through the front annular partition (160). In particular cases, two or more coils are connected in series by a continuous and unstripped wire, and in this case, the connecting wire between the coils does not need to pass back into the sealed chamber (170), thus the pair of wires extending radially will correspond to the set of coils in series. This remark is all the more valid if the coils connected in series are adjacent, but the person skilled in the art could also find ways to connect in series a set of non-adjacent coils using a continuous wire, while ensuring routing compatibility with respect to the sets of the other phases.

[0057] In a preferred embodiment, and described in this example, the winding of the teeth is carried out by a single continuous wire, successively running through the coils and forming loops inside the chamber (170), where the wire surrounds interconnecting support pads (650). It is nevertheless also possible to provide independent coils, wound separately, inserted radially on the teeth of the support, with the wires arranged radially through said front annular partition (160).

[0058] [Fig. 3] represents a detailed view of a non-limiting example of the frontal annular partition (160). It has two concentric rings (161, 162) defining an annular groove (163). The rings (161, 162) are indented by radial slots (164, 165) respectively to allow the radial passage of the wires (131) of the coils (130) and their guidance at the time of winding the stator support (150). The top of the peripheral ring (162) has anchoring housings (166) for the engagement of hooks (185) for positioning and hooking a deformable indented toric part (180), for example made of elastomer.

[0059] This toric part (180) has a lower part formed by two coaxial lips (181, 182), coming astride said peripheral crown (162), the lip (182) being inserted into the annular groove (163), and an indented upper part being locally crossed by the radial wires of the coils (130), the width of the indentation slots (183) being less than the section of the winding wire (131) to ensure a sealed pinching of the wire.

[0060] This toric part (180) has on either side of each indentation slot (183) a cavity (184) opening onto the adjacent slot (183) to allow filling with a glue or a resin ensuring sealing after insertion of the winding wires (131).

[0061] These indentation slots (183) fit the side walls of the slots (165) of the peripheral crown (162).

[0062] The bottom of the slots (165) of the peripheral crown (162) each have a projection (167) of the same width as the cavities (184) to form a support for the winding wire (131) and prevent it from causing shearing of the bottom of the toric part (180) during winding and a potential loss of sealing of the front annular partition (160).

[0063] When the wires are all in place, the sealing of the chamber (170) is perfect by an additional seal (800), for example produced by the deposit of an adhesive or silicone, arranged between the periphery of the front annular partition (160) and the transverse part (300). The annular configuration of the toric part (180) makes it possible to deposit this seal (800) over its entire upper face in a single continuous dosage so as to ensure perfect sealing while limiting its production cost.

[0064] The transverse part (300) has an annular protrusion (320) of a shape complementary to that of the frontal annular partition (160), or to the toric part (180) covering it, to ensure a sealed peripheral barrier of the chamber (170).

[0065] This embodiment corresponds to an advantageous example but it is understood that other solutions for sealing the passage of the wires (131) are possible. For example, the annular groove (163) between the rings (164, 165) could be filled by a deposit of glue or silicone which can be forced inside the slots (164, 165) by piston effect during assembly with the transverse part (300) thanks to a shape complementary to said space and located on said transverse part. This second solution would nevertheless be more expensive because it would require a much larger deposit of glue, a material known to be expensive. Other alternatives would be the deposit of a crown of resin or silicone on the stripped area of ​​the wires (131), or even that the peripheral ring does not surmount the surface of the stator support, but is a frontal annular partition formed on the lower surface of the transverse part (300). Closing the watertight space

[0066] In the embodiment described, the electronic card (400) is housed in a sealed chamber (310) separate from the chamber (170), the two chambers communicating with each other. An alternative embodiment consists of providing only one chamber (170), the volume of which is sufficient to house both the interconnection of the coils and the electronic card (400).

[0067] A closing cover (500) seals the chamber (310).

[0068] Detailed description of the interconnection of the coils

[0069] In the example described, the motor has three phases, resulting in an interconnection of the coils for groupings via an electrical circuit (600) formed of three metal tracks (610, 620, 630).

[0070] As more particularly visible in [Fig.2], the wire (131) alternately runs the coils (130) and the electrical circuit (600) during winding by an automaton, without breaking the wire.

[0071] The wire (131) is anchored at a starting point (640) consisting of a flared shape in which the start of the wire is engaged and held by wedging. It then passes radially through the front annular partition (160) successively through slots (164, 165) provided in the crowns (161, 162), and then winds a first tooth (120), before radially joining the chamber (170) by passing again successively through other slots (165, 164) of the front annular partition (160). Inside the chamber (170), it goes around a support pad (650) of a first track (610), before returning radially towards another coil (130) adjacent to the previous one, after having crossed the frontal annular partition (160) via still other slots (164, 165).

[0072] The wire (131) then winds the second tooth, before radially joining the chamber (170) by passing again through slots (165, 164) of the front annular partition (160). Inside the chamber (170), it goes around a support pad (650) of a second track (620), before returning radially towards another coil (130) adjacent to the previous one; and so on.

[0073] Each support pad (650) is associated with a deformable lug (660) which is folded back, after the passage of the wire (131), against the wire (131) surrounding the support pad (650) to provide a welding point locally removing the insulation coating of the wire. The support pads (650) and the lugs (660) are produced by local deformations of the metal track (610, 620, 630).

[0074] In the most general case, the wire (131) passes through the front annular partition (160) before and after each coil (130). However, in the case where certain coils (130) are connected in series, whether consecutive or not, the wire (131) passes through the front annular partition (160) only to ensure the connections between a coil and a track (610, 620, 630), but not for the direct connections of two coils (130), in order to reduce the passages and therefore the possible sources of leaks. Detailed description of the rotor (200)

[0075] The embodiment described provides a rotor architecture guided by two ball bearings (230, 240) inserted in the rotor yoke (210) consisting of a stack of laminations, axially spaced apart to ensure its stability. The outer rings of the ball bearings (230, 240) are both mounted tightly in the rotor yoke (210) constituting the rotor yoke. Note that in Figures 1, 4 and 10 the laminations are not shown to improve readability. The inner rings of the ball bearings (230, 240) are slidably mounted on the central shaft (350).

[0076] The rotor yoke (210) has, for the sheets located at the level of the bearings (230, 240), recessed areas (215) with a non-circular central cutout (216) to provide radial elasticity allowing the insertion of the outer ring of the bearing by fitting and elastic deformation of the bearing housing. The other sheets have a simple circular central cutout, with an internal diameter smaller than the external diameter, d, of the outer ring of the bearings (230, 240), but greater than the diameter D of the central shaft (350), so as to form an axial stop (213, 214) for the bearings (230, 240).

[0077] The central shaft (350) is fixed and secured to the transverse part (300) into which it is forced or overmolded, or secured by any other known means.

[0078] In this way, the insertion of the rotor (200) into the stator (100) is easy, since the two bearings (230, 240) integral with the rotor, slide onto the central shaft (350) fixed and planted in the transverse part (300). The guidance provided by the central shaft (350) makes it possible to take up the radial magnetic forces between the rotor (200) and the stator (100), without hindering its assembly.

[0079] The final height of the rotor (200) plus stator (100) assembly is optimized because it is then possible to fix the propeller, not shown, directly in the rotor yoke (210) formed from a pack of sheets through flanges (250) provided with claws (260) for holding the magnets (270), and thus to eliminate the lower flange which holds the front bearing of the rotor in the case of known solutions of the prior art. Fixing the propeller

[0080] [Fig. 10] shows a sectional view of the engine equipped with the propeller (900).

[0081] The propeller (900) is not driven by the central rotor guide shaft (350), but by a direct connection with the rotor yoke (210).

[0082] The fixing points of the propeller (900) on the rotor yoke (210), which must allow the transmission of the drive torque, can be freely positioned on a diameter which can be larger than the diameter of the central shaft (350), since the only constraint is to remain inscribed in the interior of the rotor yoke (210) or of a flange (250) for holding the magnets (270) which can be attached to it. This positioning diameter D is of the same order of magnitude as the positioning diameter of the magnets (270) and therefore much larger than the diameter d of the fixed central shaft (350) or of the bearings which can be of small dimensions to reduce their cost.

[0083] This makes it possible to transmit a high torque (of several Newton meters) without exerting high stresses in the mechanical components, due to the much larger positioning radius than in the state-of-the-art solutions already mentioned previously.

[0084] In the embodiment proposed below, the mounting of the bearings (230) and (240) is called an “O” assembly and allows the centers of force to be moved away from the bearings for greater stability of the rotating assembly.

[0085] The use of an internal sheet metal cutout of the rotor (200), which forms a central shoulder (213, 214) on which the outer rings of the two bearings (230, 240) mounted tightly in this housing come to bear axially, combined with force absorption of the inner rings of the bearings (230, 240) respectively against an elastic washer in abutment on the axial passage (152) of the transverse cavity (151) on the one hand and a clip clamp mounted at the end of the central shaft (350) on the other hand, makes it possible to produce a configuration which gives the best guidance for a rotating assembly of large dimensions and high inertia.

[0086] Finally, in order to position and guide the insertion of the propeller in an optimal manner, axial fingers of the propeller are able to be inserted into hollowed-out zones (215) of the rotor sheet pack.

[0087] Alternative embodiment of the electrical circuit (600)

[0088] [Fig. 12] represents an alternative embodiment of the electrical circuit (600) without the lugs (660) provided for the electrical welding of the wires (131) of the coils (130) and as represented in [Fig.2]. In the case where the discharge energy of the electric arc is sufficient, it is not necessary to fold back lugs (260) from the tracks (610, 620, 630) to minimize the electrical resistance around the welding point. This embodiment makes it possible to avoid a folding operation and can lead to substantial savings by simplifying the process and reducing the cycle time. Alternative embodiment with external rotor (200)

[0089] [Fig. 13] shows an alternative embodiment known as an external rotor (200). This embodiment differs in that the rotor (200) is not fully housed within the stator, but extends axially from the receiving cavity (158), where it is guided on the central shaft (350) by means of the bearings (230, 240), to envelop the stator lamination packs, defining a bell (250). The magnets (270) of the rotor (200) line the internal cavity of this bell (250) to face the teeth (120). The stator crown (110) then joins the teeth (120) on their inner end. Alternative embodiment with a single cavity

[0090] [Fig. 14] shows an alternative embodiment of the invention. This embodiment differs from the previous embodiments in that the electronic card (400) and the electrical circuit (600) are housed in a single chamber (170). The transverse part (300) is then an integral part of the stator support (150) and the sealing of said chamber (170) at the level of the frontal annular partition (160) is ensured by the use of an annular shape (380) interposed between the part transverse (300) and the closing cover (500).

[0091] Of course, the embodiment of a single sealed cavity presented in [Fig. 14] is in no way limiting of the invention and the person skilled in the art could quite easily imagine associating this single cavity with an external rotor configuration, but also that the single cavity is formed between the stator support (150) and the transverse part (300) acting as a cover.

Claims

Claims

1. Electric motor comprising a rotor (200) and a stator (100) comprising a plurality of coils (130) interconnected with an electronic card (400) in a sealed area, said electronic card (400) being housed in a compartment separated from the coils of the stator on the one hand and from the rotor on the other hand by a transverse partition (151) or a transverse part (300), characterized in that • said coils (130) are mounted on an annular stator support (150), • said stator support (150) or said transverse part (300) having a front annular partition (160), • said front annular partition (160) separating a first space in which said coils (130) are located, and a second space formed by a sealed chamber (170) in which the inter-coil connections are located, • said front annular partition (160) being traversed ra- dially by the pairs of wires (131) of said coils (130).

2. Electric motor according to claim 1 characterized in that said frontal annular partition (160) is an extension of said stator support (150), and in that it is closed by a transverse partition (151) to form the chamber (170).

3. Electric motor according to claim 1 or 2 characterized in that said annular partition (160) is associated with a deformable seal to provide the sealed radial passage of said pairs of wires (131).

4. Electric motor according to the preceding claim, characterized in that said annular partition (160) has two rings (161, 162) defining between them an annular groove (163) in which said deformable seal is housed, said rings being provided with slots (164, 165) for the passage of said wires (131).

5. Electric motor according to claim 3 or 4 characterized in that said deformable seal is a toric part (180) having a lower part formed of two coaxial lips (181, 182), coming astride said peripheral crown (162), one of the lips (181, 182) being inserted into the annular groove (163).

6. Electric motor according to the preceding claim, characterized in that said toric part (180) is also provided with indentation slots (183) covering the sides of the slots (165) of the crown (162), said indentation slots (183) being narrower than the wires (131) to force a deformation of the toric part (180) at the time of insertion of the wires (131).

7. Electric motor according to the preceding claim characterized in that the bottom of said slots (165) of the crown (162) has a projection (167) to form a stop during the axial insertion of said wires (131) through the slots (164, 165).

8. Electric motor according to any one of claims 4 to 7 characterized in that at least one complementary annular seal (800) is associated with said deformable seal to close the passage of said wires (131).

9. Electric motor according to any one of the preceding claims, characterized in that the rotor (200) is housed within the stator (100).

10. Electric motor according to the preceding claim, characterized in that the stator support (150) produces coil bodies (140) by overmolding the teeth (120) of the stator.

11. Electric motor according to the preceding claim, characterized in that the coils (130) are produced by winding the wires directly onto said coil bodies (140) of the stator support (150).

12. Electric motor according to the preceding claim, characterized in that the magnetic body of the stator (100) consists of the assembly of the teeth (120) with a stator crown (110), the whole being secured by means of the stator support (150).

13. Electric motor according to any one of claims 1 to 9 characterized in that the stator is housed inside the rotor.

14. Method of manufacturing an electric motor according to claim 11 characterized in that all the coils (130) are produced sequentially and without interruption of the wire (131) between two coils (130).

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