Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
  • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/30—Structural association with control circuits or drive circuits
  • H02K11/33—Drive circuits, e.g. power electronics
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium

Definitions

• TITLE Electric motorization device incorporating an electrically insulating heat sink.
• the present invention relates to an electric motorization device comprising an electric motor.
• current electric motors include a rotor integral with a shaft and a stator which surrounds the rotor.
• the stator is mounted in a housing which has bearings for the rotational mounting of the shaft.
• the rotor comprises a body formed by a stack of sheets or pole wheels (claw pole) held in the form of a package by means of a suitable fixing system.
• the rotor body has internal cavities housing permanent magnets.
• the stator comprises a body formed by a stack of sheets forming a ring, the inner face of which is provided with teeth delimiting in pairs a plurality of notches open towards the interior of the stator body and intended to receive phase windings.
• the supply of the electric motor and its control require the integration of an electronic system.
• these electronic systems include a regulator making it possible to vary the intensity of the current, and a power converter such as an inverter, making it possible to transform a direct current into alternating current.
• the on-board voltages used may be different.
• malfunctions can occur if the masses of the various systems are not isolated.
• glycol water in the cooling circuit of the electric motor, and / or to use an aluminum heat sink. This solution is satisfactory in that it allows the engine to be cooled. On the other hand, glycol water having an electrical conductivity, it is therefore not possible to integrate the electronic system.
• the object of the present invention is to propose a solution which answers all or part of the aforementioned problems:
• an electric motor device comprising: an electric motor comprising a rotor intended to be set in motion, a stator, and a cooling chamber configured to cool the electric motor; an electronic system comprising electronic power elements, said electronic power elements being configured to drive the electric motor; a heat sink interposed between the electric motor and the electronic system, said heat sink being intended to cool the electronic system and comprising: a first shell intended to cooperate with the electronic system, and configured to allow heat exchange between a cooling fluid and the electronic system; a second shell intended to cooperate with the electric motor on the one hand and with the first shell on the other hand, said second shell being configured to prevent heat exchange between the cooling fluid and the electric motor.
• the first shell and the second shell defining between them a cavity, said cavity being configured to allow the passage of the cooling fluid.
• the first shell and the second shell are each made of a material configured to guarantee electrical insulation, in particular between the electronic system, the cooling fluid and the electric motor.
• the arrangements described above make it possible to guarantee electrical isolation between the power electronics of a vehicle (with electric or hybrid motorization or coming from a fuel cell) which may include an inverter, and the electric motor. In this way, the masses of the different electrical systems are isolated from each other, and overvoltages between each network of different voltages are avoided. Moreover, the passage of the cooling fluid in the cavity makes it possible to cool the electronic system.
• the electric motor device can also have one or more of the following characteristics, taken alone or in combination.
• the first shell is formed of a composite material configured to be electrically insulating and thermally conductive, said composite material comprising thermal conductive fillers from the group comprising aluminum oxides, aluminosilicates, aluminum hydroxides. or magnesium, boron nitrides.
• the second shell is formed from an electrically insulating and thermally insulating plastic material, for example belonging to the group comprising polyolefins, styrenic materials, polyamides, poly (phenylene sulfide), polysulfones and composites. reinforced with non-conductive mineral fillers such as glass fibers.
• an electrically insulating and thermally insulating plastic material for example belonging to the group comprising polyolefins, styrenic materials, polyamides, poly (phenylene sulfide), polysulfones and composites. reinforced with non-conductive mineral fillers such as glass fibers.
• the heat sink comprises at least one fluid inlet being in fluid connection with the cavity, said at least one fluid inlet being configured to allow the entry of the cooling fluid into the cavity; and at least one fluid outlet being in fluid connection with the cavity on the one hand and with the cooling chamber on the other hand, and intended to allow the passage of the cooling fluid from the cavity to the cooling chamber.
• the fluid outlet is in fluid connection with a general glycol circuit of the vehicle, in particular in the case where the electronic system is separate from the electric motor.
• the fluid inlet comprises a tube configured to cooperate with an inlet orifice, formed in the second shell, said inlet orifice being configured to ensure a fluid connection between the tube and the cavity.
• the heat sink comprises at least one wall integral with the first shell and / or the second shell, said at least one wall projecting into the cavity and being configured to direct the passage of the fluid from cooling in the cavity.
• the at least one wall is configured to define a circuit for passing the cooling fluid through the cavity.
• the at least one wall has at least one wall section having a curved shape.
• the heat sink comprises a plurality of walls providing a heat exchange surface between the cooling fluid and the material constituting the plurality of walls.
• the cooling fluid passage circuit makes it possible to cool the first shell more efficiently by increasing the heat exchange surface.
• the electric motor is configured to operate at a voltage substantially equal to 48V.
• the electronic system is configured to operate at a voltage substantially equal to 12V.
• the electronic system is configured to operate at a voltage substantially equal to 24V.
• the electronic system is configured to operate at a voltage between 12V and 52V.
• the electronic power elements can in particular comprise one or more elements included in the group comprising an inverter, a rectifier, a voltage booster, or a voltage step-down.
• the electronic system can include transistors (Mosfet, IGBT) configured to drive the electric motor by allowing the passage or alternatively the elimination of the currents in the stator windings.
• the first shell comprises first fixing means intended to enable the electronic system to be secured to the first shell.
• the first shell comprises non-opening tapped holes so that the electronic system is screwed onto the first shell.
• the first shell and the second shell comprise second fixing means configured to secure said first shell with said second shell.
• the first shell can be fixed to the second shell by gluing, by screwing, by welding or by clipping.
• the first shell has a shape adapted to cooperate with the electronic system.
• the first shell comprises a plate, for example having the shape of a disc, configured to allow the electronic system to be fixed on the plate.
• all or part of the electronic system can be screwed, glued, welded or printed on the first shell.
• the second shell has a shape adapted to the electric motor.
• electric motors have a cylindrical shape.
• the second shell may have a cylindrical shape to adapt to and cooperate with the electric motor.
• FIG. 1 is a schematic sectional view of the electric propulsion system according to a particular embodiment.
• FIG. 2 is a perspective view of the heat sink of Figure 1.
• FIG. 3 is a sectional view of the heat sink of FIG. 1.
• FIG. 4 is a perspective view of the heat sink of FIG. 1.
• FIG. 5 is a perspective view of the heat sink of FIG. 1.
• FIG. 6 is a perspective view of the second shell included in the heat sink of FIG. 1.
• the invention relates to an electric motorization device 1 comprising an electronic system 20, an electric motor 30, and a heat sink 40.
• the electric motor 30 comprises a rotor 10 intended to be set in motion, a stator 36 and a cooling chamber 38 arranged on the periphery of the rotor 1 and configured to cool the electric motor 30.
• This electric motor 30 comprises in particular a two-part housing housing the rotor 10 integral in rotation with a rotor shaft 12 and an annular stator 36 which surrounds the rotor 10 coaxially with the rotor shaft 12.
• the housing consists in particular of a front bearing 32 and of a bearing rear 34 connected to each other for example by means of screws.
• the bearings 32, 34 are of hollow shape and each generally carries a central ball bearing for example ball 33 for the rotational mounting of the rotor shaft 12.
• chignons 37 project axially on either side of the stator body 36 and are housed in the intermediate space separating the stator 36 from the respective bearings 32, 34.
• the electric motor 30 is configured to operate at a voltage substantially equal to 48V.
• the electronic system 20 may include electronic power elements, said electronic power elements being configured to drive the electric motor 30.
• the electronic power elements can in particular comprise one or more elements included in the group consisting of an inverter, a rectifier, a step-up, or a voltage step-down.
• the electronic system 20 can include transistors (Mosfet, IGBT) configured to drive the electric motor 30 by allowing the passage or alternatively the suppression of the currents in the stator windings.
• the electronic system 20 can be configured to operate at a voltage substantially equal to 12V, or at a voltage substantially equal to 24V, or at a voltage between 12V and 52V.
• the heat sink 40 is interposed between the electric motor 30 and the electronic system 20.
• the heat sink 40 may be intended to cool the electronic system 20 and / or the electric motor 30.
• the heat sink 40 comprises at least one fluid inlet 45 configured to allow the entry of the cooling fluid into a cavity 48 included in the heat sink 40; and at least one fluid outlet 47 being in fluid connection with the cavity 48 on the one hand and with the cooling chamber 38 on the other hand. In this way a cooling fluid can circulate from the cavity 48 to the cooling chamber 38.
• the heat sink 40 comprises a first shell 42 intended to cooperate with the electronic system 20, and a second shell 44 intended to cooperate with the electric motor 30 on the one hand and with the first shell 42 d 'somewhere else.
• the first shell 42 and the second shell 44 define between them a cavity 48 configured to allow the passage of the cooling fluid.
• the first shell 42 and the second shell 44 are each made of a material ensuring electrical insulation, in particular between the electronic system 20, the cooling fluid and the electric motor 30.
• first shell 42 can be configured to allow heat exchange between the coolant and the electronic system 20
• second shell 44 can be configured to prevent heat exchange between the coolant and the electric motor 30.
• the first shell 42 may be made of a composite material configured to be an electrical insulator and a thermal conductor, said composite material comprising thermal conductive fillers belonging to the group consisting of aluminum oxides, aluminosilicates, hydroxides of 'aluminum or magnesium, boron nitrides
• the second shell 44 may be made of a plastic or composite material, electrically insulating and thermal insulating belonging to the group comprising polyolefins (polyethylene, polypropylene, etc.), styrenic materials (polystyrene, acrylonitrile butadiene styrene, etc.), polyamides (PA6, PA66, polyphthalamide, etc.), poly (phenylene sulfide), polysulfones (polyethersulfone, polysulfone, etc.), and composites reinforced with non-mineral fillers conductive like glass fibers.
• the first shell 42 may include first attachment means intended to secure the electronic system 20 with the first shell 42.
• the first shell 42 may be attached to the electronic system 20 by an adhesive.
• the first shell 42 further comprises a plate, for example having the shape of a disc, configured to allow the electronic system 20 to be fixed on the plate.
• the first shell 42 and the second shell 44 may be provided with second fixing means configured to secure said first shell 42 with said second shell 44.
• first shell 42 may be attached to the second shell 44 by gluing, by screwing, by welding or by clipping.
• the second shell 44 has a shape adapted to the electric motor 30.
• the second shell 44 may have a cylindrical shape to adapt to and cooperate with the electric motor 30.
• the second shell 44 comprises the fluid inlet 45 and the fluid outlet 47.
• the fluid inlet 45 may have a tube configured to cooperate with an inlet orifice. formed in the second shell 44.
• the inlet port being configured to provide a fluid connection between the tube and the cavity 48. In this way, the fluid inlet 45 is in fluid connection with the cavity 48.
• the heat sink 40 can comprise at least one wall 46 integral with the first shell 42 and / or the second shell 44.
• the heat sink comprises a plurality of walls 46 included. on the second shell 44 and projecting into the cavity 48.
• Each wall 46 of the plurality of walls 46 has at least one wall section 46 having a curved shape, so as to orient the passage of the cooling fluid in the cavity 48.
• the arrangements described above allow the walls 46 to define a circuit for the passage of the cooling fluid in the cavity 48 and provide a larger heat exchange surface between the cooling fluid and the material constituting the plurality of walls 46.
• the cooling fluid passage circuit makes it possible to cool the first shell 42 more effectively by increasing the heat exchange surface.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Motor Or Generator Cooling System (AREA)
• Motor Or Generator Frames (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=72356135

Family Applications (1)

Country Status (5)

Family Cites Families (15)

• 2020
  • 2020-05-29 FR FR2005693A patent/FR3111028B1/fr active Active
• 2021
  • 2021-05-04 US US17/928,474 patent/US20230208253A1/en active Pending
  • 2021-05-04 CN CN202180038924.9A patent/CN115699539A/zh active Pending
  • 2021-05-04 EP EP21732422.7A patent/EP4158763A2/de active Pending
  • 2021-05-04 WO PCT/FR2021/050765 patent/WO2021240084A2/fr unknown

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