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EP-4736299-A1 - ELECTRIC MOTOR WITH IMPROVED ASSEMBLY

EP4736299A1EP 4736299 A1EP4736299 A1EP 4736299A1EP-4736299-A1

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.

Inventors

  • PRÉAULT, Valentin
  • FOUCAUT, ANTOINE

Assignees

  • Moving Magnet Technologies

Dates

Publication Date
20260506
Application Date
20240607

Claims (14)

  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 frontal annular partition (160), said frontal 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 frontal annular partition (160) being radially crossed 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 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 crowns (161, 162) defining between them an annular groove (163) in which said deformable seal is housed, said crowns 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), straddling 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) is made up 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).

Description

Electric motor with improved assembly Field of invention The present invention relates to the field of electric motors, and in particular electric motors for fans. For certain applications likely to subject the engine to an aggressive environment loaded with moisture and/or particles, it is necessary to preserve the electrical connections and live bare 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 electrical connections, or even local destruction or fire risks. 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 Disadvantage of the prior art Solution provided by the invention General principle of the invention Detailed description of the stator (100) Closing the watertight space Detailed description of the rotor (200) Fixing the propeller Alternative embodiment with external rotor (200) Single cavity design variant 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. Patent application US2012098363 describes a stator of an electric motor having phase potential bars and an insulating retaining element. The insulating retaining element includes a first component configured to receive the phase potential bars and to electrically insulate the phase potential bars from each other. The insulating retaining element further includes a second component separate from the first component. The second component, in conjunction with the first component, forms a cup that borders the phase potential bars. The prior art solutions are not entirely satisfactory because they provide either to seal the entire motor assembly and therefore pose a problem for cooling the coils, or to place only the electronic card in a sealed compartment and therefore to seal the rigid and discrete conductors connecting it to the winding phases. The prior art solutions provide to place the connections in a separate sealed enclosure. These sealing means are provided axially, which complicates the 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 gasket, which represents an operation difficult to carry out industrially at high rates. The discrete solutions of the prior art are not satisfactory with regard to their industrialization because of the multiplication of manual operations. 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. 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. It relates to an electric motor having the characteristics set out in claim 1. 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, 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 radially crossed by the pairs of wires o