Electric motor with improved assembly

Abstract

The invention relates to an electric motor comprising a rotor and a stator, the stator comprising a plurality of coils that are interconnected with an electronic board in a sealed area, the electronic board being housed in a compartment that is separated both from the coils of the stator and from the rotor by a transverse partition or a transverse part, characterised in that the coils are mounted on an annular stator support, the stator support or the transverse part having a front annular partition, the front annular partition separating a first space in which the coils are located, and a second space formed by a sealed chamber in which the inter-coil connections are located, the pairs of wires of the coils passing radially through the front annular partition.

Description

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 motor 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, printed circuits and electrical connections are housed. Different solutions have been proposed to ensure the sealing of this connection area. State of the art

[0004] In particular, patent application WO2003081755 is known in the prior art, which relates to a stator intended for an electric motor, in particular for a high-power low-voltage motor of the external armature motor type, and which comprises a stack of stator laminations provided with a multitude of stator grooves and stator teeth for housing stator windings, as well as an interconnection system for interconnecting winding wires of the stator windings. The stator windings wound around the stator teeth through the stator grooves overhang the stack of stator laminations of a winding head on both end faces.The interconnection system consists of winding contact elements as well as interconnection contact elements, the interconnection contact elements at least being arranged on one end face of the stator lamination stack substantially within a space delimited by the stator windings and by a plane defined by the winding head.

[0005] Patent application US2012098363 describes a stator of an electric motor comprising phase potential bars and an insulating retaining element. The insulating retaining element comprises a first component configured to accommodate the phase potential bars and to electrically insulate the phase potential bars from each other. The insulating retaining element further comprises a second component separate from the first. The second component, in conjunction with the first component, forms a cup that borders the phase potential bars. Disadvantage of the prior art

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

[0007] These sealing means are provided axially, which complicates manufacturing because the output wire of the coil is floating, i.e. with a free end, which must be "pushed" through a sealing joint, which represents an operation difficult to carry out industrially at high speeds. The discrete solutions of the prior art are not satisfactory with regard to their industrialization because of the multiplication of manual operations.

[0008] Furthermore, the invention proposes an increase in the number of passages between the two spaces, and therefore the risk of loss of sealing in the event of deterioration of one of the sealing joints. Solution provided by the invention

[0009] The object of the present invention is to overcome these drawbacks by combining radial connections which lead into a watertight chamber with a separate chamber containing a printed circuit board.

[0010] It relates to an electric motor having the characteristics set out in claim 1.

[0011] This motor comprises 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,

[0012] 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.

[0013] 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.

[0014] Furthermore, said annular partition is associated with a deformable seal to achieve the sealed radial passage of said pairs of wires.

[0015] In particular, said annular partition has two crowns defining between them an annular groove in which said deformable seal is housed, said crowns being provided with slots for the passage of said wires.

[0016] In a variant, said deformable seal is an O-ring having a lower part formed of two coaxial lips, straddling said peripheral crown, one of the lips being inserted into the annular groove.

[0017] 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.

[0018] 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.

[0019] In one variant at least one complementary annular seal is associated with said deformable seal to close the passage of said wires.

[0020] In particular, the rotor is housed within the stator.

[0021] In this case, the stator support produces coil bodies by overmolding the stator teeth.

[0022] In particular, the coils are made by winding the wires directly onto said coil bodies of the stator support.

[0023] 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.

[0024] Alternatively, the stator is housed inside the rotor.

[0025] The invention also relates to a method of manufacturing an electric motor incorporating 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.

[0026] Detailed description of a non-limiting example of embodiment

[0027] 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:

[0028] represents an exploded view of an exemplary embodiment of an engine according to the invention,

[0029] represents a detailed perspective view of the wound stator of said motor,

[0030] represents a detailed perspective view of the coil support overmolding the teeth of said stator,

[0031] represents a perspective and sectional view of the coil support overmolding the teeth of said stator,

[0032] represents a perspective view of the stator before assembly of the crown,

[0033] represents a sectional view of said engine,

[0034] represents a detailed view, in perspective, of the passage of the wires of the coils,

[0035] represents another detailed view of the passage, in perspective, of the wires of the coils,

[0036] represents a perspective view in section of the rotor assembly,

[0037] represents a detailed view of the rotor assembly showing the mounting of a bearing in the rotor yoke,

[0038] represents a sectional view of an engine according to the invention and its propeller,

[0039] represents a view of an alternative embodiment of the electrical circuit without lugs for soldering the coil wires.

[0040] represents a schematic view of another embodiment variant with an external rotor

[0041] represents a schematic view of another embodiment variant with a housing for the electronic card integrated in the stator General principle of the invention

[0042] The embodiment described concerns 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.

[0043] The solution that is the subject of the present invention is particularly interesting for the construction of high-power ventilation motors (greater than 1 kW) used for cooling the components of fast-charging devices for electric vehicles, 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 any 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.

[0044] 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 area can be exposed to splashes 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.

[0045] Note that the two sealed spaces, the one containing the connection portions and the one containing the electronic control device, can have passages from one to the other through the wall of the box because this does not compromise the protection of all the sensitive elements located inside one or other of these spaces.

[0046] Detailed description of an example of an implementation with an internal rotor

[0047] Figures 1 to 10 illustrate a non-limiting exemplary embodiment described in detail below.

[0048] The figure represents an exploded view of the motor, without its propeller. It consists of: a rotor (200), a stator (100), a transverse part (300), for example a metal part, in particular aluminum, a printed electronic card (400), a closing cover (500). Detailed description of the stator (100)

[0049] Figures 2 and 5 represent a detailed view of the stator (100). It is constituted by a stator support (150) more particularly represented by figures 3 and 4, and a stator crown (110) formed by a pack of sheets each having an annular cutout, representing the stator before assembly of the stator crown (110) on the stator support (150).

[0050] 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 one, or possibly several, packs 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 on the.The radial extension of the coil bodies is made 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 routing of the needle during the winding operation.In an advantageous configuration, visible in, 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.

[0051] 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).

[0052] As shown in, the stator ring (110) is positioned by axial insertion, such 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 closure of the magnetic flux. The stator ring is then held in position by the flexible extensions (156).

[0053] In a direction opposite to the extension of said flexible extensions (156), some or all of the protrusions (145) have a protuberance (157) ensuring the connection by rolling with the transverse part (300).

[0054] 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).

[0055] 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).

[0056] 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.

[0057] Detailed description of the annular partition (160)

[0058] 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 skilled person 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.

[0059] 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).

[0060] The figure 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.

[0061] This toric part (180) has a lower part formed by two coaxial lips (181, 182), straddling 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.

[0062] 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).

[0063] These indentation slots (183) fit the side walls of the slots (165) of the peripheral crown (162).

[0064] 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).

[0065] When the wires are all in place, the sealing of the chamber (170) is perfect by an additional seal (800), for example made by the deposit of an adhesive or silicone, placed 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) on its entire upper face in a single continuous dosage so as to ensure perfect sealing while limiting its production cost.

[0066] 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).

[0067] 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 driven 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

[0068] 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).

[0069] A closing cover (500) seals the chamber (310).

[0070] Detailed description of coil interconnection

[0071] 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).

[0072] As more particularly visible in, the wire (131) alternately passes through the coils (130) and the electrical circuit (600) during winding by an automaton, without breaking the wire.

[0073] 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 passed through the front annular partition (160) through still other slots (164, 165).

[0074] 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.

[0075] 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).

[0076] 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)

[0077] 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 tightly mounted 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).

[0078] The rotor yoke (210) has, for the sheets located at the bearings (230, 240), hollowed-out areas (215) with a non-circular central cutout (216) to ensure 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, e, 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).

[0079] 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.

[0080] 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 opposing its assembly.

[0081] 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 as can be the case with known solutions of the prior art. Fixing the propeller

[0082] It represents a sectional view of the engine fitted with the propeller (900).

[0083] The propeller (900) is not driven by the central rotor guide shaft (350), but by a direct connection with the rotor yoke (210).

[0084] 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 registered 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.

[0085] This allows high torque (several Newton meters) to be transmitted 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.

[0086] In the embodiment proposed below, the mounting of the bearings (230) and (240) is called an “O” mounting and allows the centers of force of the bearings to be moved away for greater stability of the rotating assembly.

[0087] 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 a conical spring, or an elastic washer, in abutment on the axial passage (152) of the transverse cavity (151) on the one hand and a circlip 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.

[0088] Finally, since the propeller (900) can be a large diameter part and can rotate quickly, the correct balance of the masses of this part is necessary. In order to reduce or avoid balancing after mounting the propeller on the motor, it is necessary to center it as well as possible relative to the axis of rotation of the motor at the time of assembly. In order to position and guide the insertion of the propeller optimally, axial fingers (910) of the propeller are able to be inserted around the outer ring of the bearing (240), in recessed areas (218) of the rotor lamination pack. This provides very good concentricity of the propeller relative to the axis of rotation of the rotor (200). The axial fingers (910) have a beveled end so as to facilitate their insertion into the recessed areas (218). The propeller (900) is preferably molded in a single piece to control the geometric tolerances between the different surfaces.The propeller (900) is secured to the rotor by means of fixing screws (920).

[0089] Alternative embodiment of the electrical circuit (600)

[0090] La 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. In the case where the discharge energy of the electric arc is sufficient, it is simpler to fold lugs (260) from the tracks (610, 620, 630) to minimize the electrical resistance around the welding point. This embodiment makes it possible to simplify the folding operation and can lead to substantial savings by improving the process and reducing the cycle time. Alternative embodiment with external rotor (200)

[0091] The present embodiment is a variant 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. Single cavity variant

[0092] This is 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 front annular partition (160) is ensured by the use of an annular shape (380) interposed between the transverse part (300) and the closing cover (500).

[0093] Of course, the embodiment of a single sealed cavity presented is in no way limiting of the invention and the person skilled in the art could quite 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

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 of 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 radially by the pairs of wires (131) of said coils (130). 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). 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). 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). 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). 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). 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). 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). Electric motor according to any one of the preceding claims, characterized in that the rotor (200) is housed within the stator (100). 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. 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). 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). Electric motor according to any one of claims 1 to 9, characterized in that the stator is housed inside the rotor. 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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