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: Improved assembly electric motor Scope of the invention

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

[0002] For certain applications that may subject the motor to an aggressive environment containing moisture and / or particles, it is necessary to protect electrical connections and live parts by enclosing them in a sealed space. With the advent of high-voltage power supplies, particularly in the automotive sector, where standard supply voltages can be 400 volts or even 800 volts, this issue becomes especially important because the presence of moisture or conductive particles can lead to the formation of electrical arcs causing serious damage to electrical connections, or even localized destruction or fire hazards.

[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, from a sealed space housing the electronic components, printed circuit boards, and electrical connections. Various solutions have been proposed to ensure the sealing of this connection area. State of the art

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

[0005] Utility model DE202013012219U1 describes an electric motor, in particular a radiator fan motor for a motor vehicle, with a rotor mounted to rotate relative to a stator, and having a motor bracket comprising an electronic compartment closed by a cover. An electronic circuit board is disposed in the electronic compartment, and the electronic compartment cover is connected to the motor bracket by means of an anchor hook and a latching nose comprising a connection.

[0006] Prior art solutions are not entirely satisfactory because they involve either sealing the entire motor assembly, which therefore poses a problem for the cooling of the coils, or placing only the electronic board in a sealed compartment, which requires sealing the rigid and discrete conductors connecting it to the winding phases.

[0007] These sealing means are provided axially, which complicates manufacturing because the wire coming out of the spool 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 rates.

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

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

[0010] characterized in that • said coils are mounted on an annular stator support, • said stator support or said transverse piece having a front annular partition, • said annular front 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 front annular partition being radially traversed by the pairs of wires of said coils.

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

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

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

[0014] In one variant, said deformable seal is a toroidal piece having a lower part formed of two coaxial lips, straddling said peripheral ring, one of the lips being inserted in the annular groove.

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

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

[0017] In at least one variant, an additional 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 made by winding the wires directly onto said coil bodies of the stator support.

[0021] In addition, the magnetic body of the stator consists of the assembly of teeth with a stator ring, the whole being joined together 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 incorporating one or a combination of the preceding characteristics in which all the coils are made 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 upon reading the following description, concerning a non-limiting example of an embodiment illustrated by the accompanying drawings where:

[0026] [Fig.1] [Fig.1] represents an exploded view of an example embodiment of a motor 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 cross-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 cross-sectional view of said engine,

[0032] [Fig.7] [Fig.7] represents a detailed perspective view 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 spool wires,

[0034] [Fig.9] [Fig.9] represents a cross-sectional perspective view 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 head,

[0036] [Fig. 11] [Fig. 11] represents a cross-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] shows a schematic view of another embodiment with an external rotor

[0039] [Fig. 14] [Fig. 14] shows a schematic view of another embodiment with a housing for the electronic board integrated into the stator. General principle of the invention

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

[0041] The solution of the present invention is particularly advantageous for the construction of high-power (greater than 1 kW) ventilation motors used for cooling the components of electric vehicle fast-charging devices, but it can be used for any type of ventilation or pump drive motor with integrated electronics. This allows the fluid flow to be used to cool the stator coils located in the space exposed to the airflow without risk of contamination to the sealed areas exposed to the external environment. It is also possible to create a sealed zone encompassing the rotor to ensure enhanced protection by taking advantage of the stator's overmolding and adding a part that closes this cavity and can also serve as a rotor guide.

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

[0043] Note that the two sealed spaces, the one containing the connector portions and the one containing the electronic control device, may have passages from one to the other through the wall of the case because this does not compromise the protection of all the sensitive elements located inside either of these spaces.

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

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

[0046] Figure 1 shows an exploded view of the engine, without its propeller. It consists of: - a rotor (200), - a stator (100), - a transverse part (300), for example a metal part, particularly made of aluminium, - 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 consists of a stator support (150) shown more particularly in Figures 3 and 4, and a stator ring (110) formed by a bundle of sheets each having an annular cutout, [Fig.5] showing the stator before assembly of the stator ring (110) on the stator support (150).

[0048] The stator support (150) is formed by an overmolding, by injection molding of a plastic material, of a set of radial teeth (120) also formed from a stack of laminations. This overmolding creates spaces, called coil bodies (140), for winding the wires that generate the magnetic field interacting with the rotor (200). These coil bodies (140) extend radially from an annular shell (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 to the desired coil height so as to provide a frontal support area for the coil wires (130). The annular shell (141) defines a cavity (158) for the rotor, visible in [Fig. 4].The radial extension of the coil bodies occurs along the teeth (120) with a minimal thickness, maximizing the space available 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), adjacent to the outer surface of the teeth (120), and of the same axial extent. The annular casing (141) is shaped to provide distal support for the coil wires (130). The peripheral annular sectors (142) are not joined between the teeth (120), but leave a free angular sector (143) to facilitate the needle's path during the winding operation. In an advantageous configuration, shown in [Fig. 3], these coil bodies (140) are grooved to guide the wires and facilitate winding; this is particularly useful when winding large-section wires with high rigidity.

[0049] The annular sectors (142) of the coil bodies (140) are extended radially 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 ring once the latter is assembled to the stator support (150).

[0050] As shown in [Fig. 5], the stator ring (110) is installed 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 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 butting with the transverse piece (300).

[0052] As shown in Figures 3 and 4, the stator support (150) has an inner core closed by a transverse partition (151) through which an axial passage (152) passes. This axial passage (152) is traversed by a central shaft (350) for guiding the rotor (200). A housing (153) is provided to receive an O-ring (220) of the "O Ring™" type to seal the upper part. The central shaft is fixedly mounted in a guide nose (330) of the transverse piece (300), this guide nose (330) being inserted into the axial passage (152) during the assembly of the transverse piece (300) onto the stator support (150).

[0053] The upper surface of the transverse partition (151) has protrusions (154) that serve as plastic rivets for securing the inter-coil connecting tracks (610, 620, 630) by plastic riveting, which will be detailed below. Protrusions (155) with a tapped hole are intended to receive screws for securing the transverse piece (300).

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

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

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

[0057] In a preferred embodiment, described in this example, the winding of the teeth is achieved by a single continuous wire, successively passing 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 onto the teeth of the support, with the wires arranged radially through said front annular partition (160).

[0058] Figure 3 shows a detailed view of a non-limiting example of the front 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 during the winding of the stator support (150). The apex of the peripheral ring (162) has anchoring recesses (166) for engaging positioning and hooking clips (185) for securing a deformable, indented toroidal piece (180), for example, made of elastomer.

[0059] This toroidal piece (180) has a lower part formed of two coaxial lips (181, 182), straddling said peripheral ring (162), the lip (182) fitting 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 cross-section of the winding wire (131) to ensure a tight pinch of the wire.

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

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

[0062] The bottom of the slots (165) of the peripheral ring (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 toroidal piece (180) during winding and a potential loss of sealing of the front annular partition (160).

[0063] When all the wires are in place, the chamber (170) is perfectly sealed by an additional gasket (800), for example, made by applying an adhesive or silicone, positioned between the perimeter of the front annular partition (160) and the transverse piece (300). The annular configuration of the toroidal piece (180) allows this gasket (800) to be applied to its entire upper surface in a single continuous application, thus ensuring a perfect seal while minimizing its production cost.

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

[0065] This embodiment represents an advantageous example, but it is understood that other solutions exist for sealing the passage of the wires (131). For example, the annular groove (163) between the rings (164, 165) could be filled with a deposit of glue or silicone that could be forced into the slots (164, 165) by a piston effect during assembly with the transverse piece (300) thanks to a complementary shape on said transverse piece. This second solution would nevertheless be more expensive because it would require a much larger deposit of glue, a material known to be costly. Other alternatives would be the deposition of a ring of resin or silicone on the exposed area of ​​the wires (131), or that the peripheral ring not surmount the surface of the stator support, but rather form a frontal annular partition on the lower surface of the transverse piece (300). Sealing the airtight space

[0066] In the described embodiment, the electronic board (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 board (400).

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

[0068] Detailed description of the coil interconnection

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

[0071] The wire (131) is anchored to a starting point (640) consisting of a flared shape in which the beginning 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 returning to the chamber (170) by passing successively through other slots (165, 164) of the front annular partition (160). Inside the chamber (170), it passes around a support pad (650) of a first track (610), before returning radially to another coil (130) adjacent to the previous one, after passing through the front annular partition (160) through yet more slots (164, 165).

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

[0073] Each support pad (650) is associated with a deformable lug (660) which, after the passage of the wire (131), is folded against the wire (131) surrounding the support pad (650) to ensure a weld point that locally removes the wire's insulation coating. The support pads (650) and the lugs (660) are formed 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 some 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 leakage. Detailed description of the rotor (200)

[0075] The described embodiment provides for a rotor architecture guided by two ball bearings (230, 240) inserted into the rotor yoke (210), which is made of a stack of laminations, axially spaced to ensure its stability. The outer rings of the ball bearings (230, 240) are both press-fitted into the rotor yoke (210), which forms the rotor yoke. Note that in the figures Figures 1, 4 and 10 do not show the sheet metal to improve readability. The inner rings of the ball bearings (230, 240) are mounted slidingly on the central shaft (350).

[0076] The rotor head (210) has, for the plates located at the bearings (230, 240), recessed areas (215) with a non-circular central cutout (216) to ensure radial elasticity allowing the insertion of the outer ring of the bearing by press-fitting and elastic deformation of the bearing housing. The other plates have a simple circular central cutout, with an inner diameter smaller than the outer diameter, d, of the outer ring of the bearings (230, 240), but larger 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 integral with the transverse piece (300) into which it is pressed or overmolded, or further secured by any other known means.

[0078] In this way, the insertion of the rotor (200) into the stator (100) is easily done, since the two bearings (230, 240) attached to the rotor slide onto the fixed central shaft (350) which is planted in the transverse piece (300). The guidance provided by the central shaft (350) allows the radial magnetic forces between the rotor (200) and the stator (100) to be absorbed without hindering their 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 into the rotor yoke (210), formed from a stack of sheet metal, through flanges (250) equipped with claws (260) for holding the magnets (270), and thus eliminate the lower flange that holds the front bearing of the rotor, as is the case with known prior art solutions. Propeller attachment

[0080] Fig. 10 represents a cross-sectional view of the engine fitted with the propeller (900).

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

[0082] The propeller (900) mounting points on the rotor yoke (210), which must transmit the drive torque, can be freely positioned on a diameter that may be larger than the diameter of the central shaft (350), since the only constraint is to remain within the interior of the rotor yoke (210) or a flange (250) for holding the magnets (270) that may 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 small 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 positioning radius being much larger 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" mounting and allows the centers of force of the bearings to be moved further apart 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 bear axially, combined with force transfers of the inner rings of the bearings (230, 240) respectively against an elastic washer abutting 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 achieve a configuration which gives the best guidance for a large rotating assembly with high inertia.

[0086] Finally, in order to optimally position and guide the insertion of the propeller, axial fingers of the propeller are able to insert into hollow areas (215) of the rotor sheet metal package.

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

[0088] Figure 12 shows an alternative embodiment of the electrical circuit (600) without the tabs (660) provided for the electrical welding of the wires (131) of the coils (130) and as shown in Figure 2. If the discharge energy of the electric arc is sufficient, it is not necessary to bend tabs (260) from the tracks (610, 620, 630) to minimize electrical resistance around the weld point. This embodiment eliminates the need for a bending operation and can lead to substantial cost savings by simplifying the process and reducing cycle time. External rotor embodiment variant (200)

[0089] Figure 13 shows an embodiment known as an external rotor (200). This embodiment differs in that the rotor (200) is not entirely housed within the stator, but extends axially from the receiving cavity (158), where it is guided on the central shaft (350) by means of bearings (230, 240), to enclose the stator laminations, 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 ring (110) then joins the teeth (120) at their inner end. Single-cavity embodiment

[0090] Figure 14 shows an alternative embodiment of the invention. This embodiment differs from previous embodiments in that the electronic board (400) and the electrical circuit (600) are housed in a single chamber (170). The transverse piece (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 piece (300) and the closing cover (500).

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

Claims

Demands

1. 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).

2. Electric motor according to claim 1 characterized in that said front 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 achieve 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 toroidal piece (180) having a lower part formed of two coaxial lips (181, 182), straddling said peripheral ring (162), one of the lips (181, 182) being inserted in the annular groove (163).

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

7. Electric motor according to the preceding claim characterized in that the bottom of said slots (165) of the ring (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 additional 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) forms 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 made 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) is made up of the assembly of teeth (120) with a stator ring (110), the whole being joined together 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 made sequentially and without interruption of the wire (131) between two coils (130).

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