WO2021164944A1 - Moteur électrique à système de refroidissement intégré - Google Patents

Moteur électrique à système de refroidissement intégré Download PDF

Info

Publication number
WO2021164944A1
WO2021164944A1 PCT/EP2021/025065 EP2021025065W WO2021164944A1 WO 2021164944 A1 WO2021164944 A1 WO 2021164944A1 EP 2021025065 W EP2021025065 W EP 2021025065W WO 2021164944 A1 WO2021164944 A1 WO 2021164944A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
assembly
cooling
motor
examples
Prior art date
Application number
PCT/EP2021/025065
Other languages
English (en)
Inventor
Mikhail Goykhman
Galen CHUI
Armen BARONIAN
Original Assignee
Eaton Intelligent Power Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eaton Intelligent Power Limited filed Critical Eaton Intelligent Power Limited
Publication of WO2021164944A1 publication Critical patent/WO2021164944A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00—Arrangement or mounting of power plant in aircraft; Aircraft characterised thereby
    • B64D27/02—Aircraft characterised by the type or position of power plant
    • B64D27/24—Aircraft characterised by the type or position of power plant using steam, electricity, or spring force
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
    • 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
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/40—Weight reduction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/50—On board measures aiming to increase energy efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • the present disclosure relates generally to electric motors and systems and methods for cooling electric motors.
  • EDS Electrical drive systems
  • heat extraction One of the hurdles to deal with in a high power density machine is heat extraction.
  • FIG. 1 shows an example thermal management arrangement for a prior system 50 including an electric motor 52 coupled in series to a separate gear train 54 and a propeller 56 or other load source using a motor shaft.
  • An electric drive 58 controls the speed and/or torque applied by the electric motor 52 to the motor shaft based on a voltage and/or current input of the electric drive 58.
  • the electric motor 52 is thermally managed using a separate coolant pump 60 and a separate heat exchanger 62.
  • the coolant pump 60 drives coolant from the coolant pump 60, to the electric drive 58 to absorb heat from the electric drive 58, to the electric motor 52 to absorb heat from the electric motor 52, and to a heat exchanger 62 to dissipate the absorbed heat.
  • the coolant driven by the pump 60 passes through external piping that connects the various components.
  • the coolant proceeds along a cyclic piping pathway 64 from the pump 60, to the electric drive 58, to the electric motor 52, and then to the heat exchanger 62.
  • the coolant proceeds along separate piping pathways between the pump 60 and the various components 58, 52, 62.
  • the external piping needs to be fitted to each of the components for connection to internal coolant pathways (e.g., channels) within the component. Further, sufficient coolant must be provided to span the distance between the components as well as to circulate within the components.
  • An axial flux electric motor can include a motor assembly including a motor shaft, a rotor assembly, and a stator assembly including a plurality of stator cores about which a wire coil is wound, wherein one or more of the stator cores includes a stator body with an internal fluid passageway for receiving a cooling fluid.
  • the stator body internal fluid passageway includes a plurality of fluid passageways.
  • the internal fluid passageway extends to a fluid inlet and a fluid outlet located at an outer surface of the stator body.
  • the outer surface of the stator body is an end surface of the stator body.
  • the internal fluid passageway extends to a fluid inlet located at an outer surface of the stator body.
  • the internal fluid passageway extends to a plurality of outlet ports located on one or more sides of the stator body.
  • the motor assembly further includes a pump for delivering cooling fluid to the internal fluid passageway.
  • the motor assembly further includes a sump for collecting cooling fluid discharged from the plurality of outlet ports.
  • a stator assembly can include a plurality of stator cores about which a wire coil is wound, wherein one or more of the stator cores includes a stator body with an internal fluid passageway for receiving a cooling fluid.
  • the stator body internal fluid passageway includes a plurality of fluid passageways.
  • the internal fluid passageway extends to a fluid inlet and a fluid outlet located at an outer surface of the stator body.
  • the outer surface of the stator body is an end surface of the stator body.
  • the internal fluid passageway extends to a fluid inlet located at an outer surface of the stator body.
  • the internal fluid passageway extends to a plurality of outlet ports located on one or more sides of the stator body.
  • the motor assembly further includes a pump for delivering cooling fluid to the internal fluid passageway.
  • the motor assembly further includes a sump for collecting cooling fluid discharged from the plurality of outlet ports.
  • a method of cooling a stator assembly of a motor can include delivering a cooling fluid to a plurality of stator cores about which a wire coil is wound and directing the cooling fluid through internal passageways of the stator cores.
  • cooling fluid is discharged from the internal passageways onto the wire coil.
  • the delivering step is performed with a pump.
  • a motor assembly can include a motor shaft, a rotor assembly, a stator assembly including at least one stator core about which a wire coil is wound, and an intermediate cooling layer disposed between the at least one stator core and the wire coil, wherein the intermediate cooling layer includes a stator body with an internal fluid passageway for receiving a cooling fluid.
  • the internal fluid passageway includes a plurality of fluid passageways.
  • the internal fluid passageway extends to a fluid inlet and a fluid outlet located at an outer surface of the intermediate cooling layer.
  • the intermediate cooling layer includes extensions extending between individual windings of the wire coil.
  • the internal fluid passageway extends to a fluid inlet located at an outer surface of the intermediate cooling layer.
  • the internal fluid passageway extends to a plurality of outlet ports located on one or more sides of intermediate cooling layer.
  • the motor assembly further includes a pump for delivering cooling fluid to the internal fluid passageway.
  • the intermediate cooling layer is formed from a thermally conductive material.
  • a stator assembly for a motor can include at least one stator core about which a wire coil is wound and an intermediate cooling layer disposed between the at least one stator core and the wire coil, wherein the intermediate cooling layer includes a stator body with an internal fluid passageway for receiving a cooling fluid.
  • the internal fluid passageway includes a plurality of fluid passageways.
  • the internal fluid passageway extends to a fluid inlet and a fluid outlet located at an outer surface of the intermediate cooling layer.
  • the intermediate cooling layer includes extensions extending between individual windings of the wire coil.
  • the internal fluid passageway extends to a fluid inlet located at an outer surface of the intermediate cooling layer.
  • the internal fluid passageway extends to a plurality of outlet ports located on one or more sides of intermediate cooling layer.
  • the motor assembly further includes a pump for delivering cooling fluid to the internal fluid passageway.
  • the intermediate cooling layer is formed from a thermally conductive material.
  • a method for cooling a motor can include delivering a cooling fluid to at least one stator core about which a wire coil is wound and directing the cooling fluid through internal passageways of an intermediate cooling layer disposed between the at least one stator core and the wire coil.
  • the method further includes directing the cooling fluid through a plurality of intermediate cooling layers associated with a plurality of stator cores.
  • the delivering step is performed with a pump.
  • a motor assembly can include a motor shaft, a rotor assembly, a stator assembly including at least one stator core about which a wire coil is wound and embedded within a thermally conductive material, the stator assembly defining an annulus with a radial interior side and a radial exterior side, and a first internal fluid passageway defined within the thermally conductive material and being located at one of the radial interior side and the radial exterior side of the stator assembly, the first internal fluid passageway being configured for receiving a cooling fluid.
  • the first internal fluid passageway includes a plurality of internal fluid passageways.
  • the first internal fluid passageway is located at the radial interior side of the stator assembly.
  • the first internal fluid passageway is located at the radial exterior side of the stator assembly.
  • the motor further includes a second internal fluid passageway defined within the thermally conductive material and being located at the other of the radial interior side or the radial exterior side of the stator assembly, the second internal fluid passageway being configured for receiving the cooling fluid.
  • first and second internal fluid passageways each include a plurality of internal fluid passageways.
  • the first internal fluid passageway is located at the radial interior side of the stator assembly and the second internal fluid passageway is located at the radial exterior side of the stator assembly.
  • the first internal fluid passageway and the second internal fluid passageway each include at least one fluid inlet and at least one fluid outlet.
  • the motor assembly further includes a pump for delivering cooling fluid to the first internal fluid passageway.
  • the thermally conductive material is an epoxy material.
  • a stator assembly for a motor can include at least one stator core about which a wire coil is wound and a stator assembly including at least one stator core about which a wire coil is wound and embedded within a thermally conductive material, the stator assembly defining an annulus with a radial interior side and a radial exterior side, and a first internal fluid passageway defined within the thermally conductive material and being located at one of the radial interior side and the radial exterior side of the stator assembly, the first internal fluid passageway being configured for receiving a cooling fluid.
  • the first internal fluid passageway includes a plurality of internal fluid passageways.
  • the first internal fluid passageway is located at the radial interior side of the stator assembly.
  • the first internal fluid passageway is located at the radial exterior side of the stator assembly.
  • the stator assembly includes a second internal fluid passageway defined within the thermally conductive material and being located at the other of the radial interior side or the radial exterior side of the stator assembly, the second internal fluid passageway being configured for receiving the cooling fluid.
  • first and second internal fluid passageways each include a plurality of internal fluid passageways.
  • the first internal fluid passageway is located at the radial interior side of the stator assembly and the second internal fluid passageway is located at the radial exterior side of the stator assembly.
  • the first internal fluid passageway and the second internal fluid passageway each include at least one fluid inlet and at least one fluid outlet.
  • the thermally conductive material is an epoxy material.
  • a method of cooling a stator assembly of a motor can include delivering a cooling fluid to at least one stator core about which a wire coil is wound and directing the cooling fluid through one or more internal passageways of a thermally conductive material within which the wire coil is embedded.
  • the delivering step is performed with a pump.
  • An electric motor assembly can include a motor shaft, a stator assembly, and a rotor assembly and a cooling jacket surrounding the stator assembly, the cooling jacket including an inner wall facing radially inwardly towards the stator assembly and an opposite outer wall facing radially outwardly, a circumferential first internal fluid passageway for allowing a cooling fluid to be pumped through an interior of the cooling jacket, the internal fluid passageway being disposed between the inner and outer walls and extending between an inlet and an outlet, and a first end plate covering and in contact with at least a portion of a first end if the stator assembly, the first end plate including a second internal fluid passageway in fluid communication with the first circumferential fluid pathway for allowing the cooling fluid to be pumped through an interior of the first end plate.
  • the end plate is located between the stator assembly and magnets associated with the motor assembly.
  • the second internal fluid passageway includes a plurality of internal passageways.
  • the end plate is in direct contact with an end face of one or more stator cores associated with the stator assembly.
  • the end plate second internal passageway is in fluid communication with the circumferential first internal passageway at a plurality of connection points.
  • the end plate and the cooling jacket are formed from the same type of material.
  • the end plate and the cooling jacket are formed from different types of materials.
  • the electric motor assembly includes an axial flux electric motor assembly.
  • the electric motor assembly further includes a pump for delivering cooling fluid to the internal fluid passageway.
  • the pump is driven by the motor shaft.
  • a cooling system for an electric motor assembly can include a cooling jacket for surrounding a stator assembly, the cooling jacket including an inner wall facing radially inwardly and an opposite outer wall facing radially outwardly, a circumferential first internal fluid passageway for allowing a cooling fluid to be pumped through an interior of the cooling jacket, the internal fluid passageway being disposed between the inner and outer walls and extending between an inlet and an outlet, and a first end plate configured to cover and be in contact with at least a portion of the stator assembly, the first end plate including a second internal fluid passageway in fluid communication with the first circumferential fluid pathway for allowing the cooling fluid to be pumped through an interior of the first end plate.
  • the second internal fluid passageway includes a plurality of internal passageways.
  • the end plate second internal passageway is in fluid communication with the circumferential first internal passageway at a plurality of connection points.
  • the end plate and the cooling jacket are formed from the same type of material.
  • the end plate and the cooling jacket are formed from different types of materials.
  • a method of cooling a stator assembly of a motor can include the steps of delivering and returning a cooling fluid to a cooling jacket surrounding the stator assembly and delivering and returning the cooling fluid to an end plate in direct contact with an end face of the stator assembly such that that cooling is provided to the stator assembly at least at two sides of the stator assembly.
  • the delivering steps include directing the cooling fluid from internal passageways of the cooling jacket to and from internal passageways of the end plate.
  • the delivering steps are performed with a pump.
  • the delivering step is performed with a pump driven by the motor.
  • the cooling fluid is one of oil, glycol, and water.
  • An electric motor assembly unit can include an electric motor extending along a longitudinal axis between a first axial end and a second axial end, the electric motor including a stator assembly, a rotor assembly that rotates relative to the stator assembly, and a motor shaft that operationally coupled to the rotor assembly, the motor shaft extending along the longitudinal axis of the electric motor beyond the first axial end; and a heat exchanger mounted to the electric motor so as to be disposed between the first and second axial ends of the electric motor and structurally supported by the electric motor, the heat exchanger including an exchanger housing and a coolant pathway routed within the exchanger housing, the exchanger housing extending radially outwardly from the electric motor.
  • the heat exchanger encircles the stator assembly about the longitudinal axis of the electric motor.
  • the heat exchanger extends only a portion of a circumference of the stator assembly.
  • the coolant pathway within the heat exchanger is a first coolant pathway, and wherein the first coolant pathway is fluidly coupled to a second coolant pathway within the electric motor.
  • the second coolant pathway includes channels extending through a cooling jacket that surrounds the rotor assembly and stator assembly.
  • the second coolant pathway includes channels extending through portions of the stator cores of the stator assembly.
  • the second coolant pathway extends to a coolant pump mounted to the electric motor.
  • the coolant pump is mounted to the motor shaft.
  • the coolant pump is at least partially recessed into a motor housing that covers the rotor assembly.
  • the electric motor assembly further includes an epicyclic gear train disposed within the electric motor so that the epicyclic gear train is enclosed within the stator assembly and rotor assembly, wherein the epicyclic gear train includes a sun gear, a carrier coupled to a plurality of planet gears that mesh with the sun gear, and an outer ring having inwardly-facing teeth that mesh with the planet gears, wherein at least one of the sun gear, the carrier, and the outer ring rotates in unison with the drive shaft.
  • the electric motor assembly further includes a third coolant pathway providing coolant to the epicyclic gear train, the third coolant pathway being fluidly coupled to the coolant pathway extending through the exchanger housing.
  • a coolant pump mounted to the electric motor, the coolant pump being coupled to a first gear stage of the epicyclic gear train that rotates at a different speed from the drive shaft.
  • the coolant pump is mounted to the drive shaft.
  • an electric drive is disposed at an outer surface of the stator assembly.
  • the coolant pathway is fluidly coupled to a respective coolant pathway for the electric drive.
  • the electric motor includes an axial flux electric motor.
  • An aircraft propulsion system can include a propeller operationally coupled to a drive shaft extending along a longitudinal axis; an electric motor including a rotor assembly that rotates relative to a stator assembly to rotate the drive shaft; a heat exchanger mounted to the electric motor so that the heat exchanger extends radially outwardly from the electric motor, the heat exchanger extending along the longitudinal axis between opposite first and second axial ends; and a flow path along which air flow generated by the propeller flows to the first axial end of the heat exchanger.
  • the electric motor is one of a plurality of electric motors applying torque to the drive shaft, each of the electric motors being aligned along the longitudinal axis and being operationally coupled to the drive shaft; and wherein the heat exchanger is one of a plurality of heat exchangers, each of the heat exchangers being mounted to a respective one of the electric motors.
  • each of the heat exchangers extends radially outwardly from a circumferential section of the respective electric motor, wherein the heat exchangers are circumferentially staggered so that a respective first axial end of each of the heat exchangers is accessible to the flow path.
  • a nacelle surrounding a portion of the drive shaft is provided, the nacelle being spaced from the propeller along the longitudinal axis of the drive shaft, the electric motor and the heat exchanger being located within the nacelle, wherein the flow path includes a first flow path extending into the nacelle and a second flow path extending around the nacelle, the first flow path extending to the first axial end of the heat exchanger.
  • the heat exchanger and the electric motor share a coolant pathway.
  • an epicyclic gear train is disposed within the electric motor, the electric motor sharing a coolant pathway with the epicyclic gear train.
  • An electric motor assembly unit can include an electric motor extending along a longitudinal axis between a first axial end and a second axial end, the electric motor including a stator assembly, a rotor assembly that rotates relative to the stator assembly, a motor shaft operationally coupled to the rotor assembly, and a motor housing surrounding the rotor assembly and the stator assembly, the motor shaft extending along the longitudinal axis of the electric motor beyond the first and second axial ends; and an epicyclic gear train disposed within the motor housing of the electric motor between the first and second axial ends of the electric motor, the epicyclic gear train includes a sun gear, a carrier coupled to a plurality of planet gears that mesh with the sun gear, and an outer ring having inwardly-facing teeth that mesh with the planet gears, each of the sun gear, the carrier, and the outer ring forming a respective gear stage of the epicyclic gear train, wherein the gear stage of at least one of the sun gear, the carrier, and the outer ring rotates in
  • a coolant pathway extending from the coolant pump, through the electric motor, to the epicyclic gear train is provided, wherein the coolant pathway is contained at least substantially within the motor housing of the electric motor.
  • the coolant pump is disposed external of the motor housing at the first axial end of the electric motor.
  • the motor housing includes a heat exchanger and a coolant pump integrated therewith.
  • Figure 1 is a schematic diagram of an example prior art system for providing thermal management to an electric motor.
  • Figure 2 is a perspective view of an example electric motor assembly unit including an electric motor and a heat exchanger configured in accordance with the principles of the present disclosure.
  • Figure 3 is a side elevational view of the electric motor assembly unit of Figure 2.
  • Figure 4 is a perspective view of an example cross-section of the electrical motor assembly unit taken along the 4-4 line of Figure 2.
  • Figure 5 is a perspective view of an example stator assembly suitable for use with the electric motor of Figure 2.
  • Figure 6 is a perspective view of an example stator core suitable for use with the stator assembly of Figure 5.
  • Figure 7 is a perspective view of an example wire coiling suitable for use with the stator assembly of Figure 5.
  • Figure 8 is a perspective view of an example electric motor assembly unit that is substantially the same as the electric motor assembly unit of Figure 2 except the motor shaft is defined by a gear train that fits within the electric motor.
  • Figure 9 is a perspective view of an example magnetic rotor suitable for use with the rotor assembly of the electric motor of Figure 2.
  • Figure 10 is a perspective view of an example permanent magnet of the magnetic rotor of Figure 9.
  • Figure 11 is a partial view of a cross-section taken of the electric motor assembly unit where example coolant pathways are overlaid.
  • Figure 12 is a schematic diagram of the electric motor assembly unit of Figure 2 disposed within a nacelle of an example aircraft propulsion system and configured in accordance with the principles of the present disclosure.
  • Figure 13 shows multiple electric motors disposed within the nacelle of Figure 12, each electric motor having a respective heat exchanger that is circumferentially staggered relative to the other heat exchangers.
  • Figure 14 is a partial view of a cross-section of the drive shaft of Figure 13 taken along the 14-14 line.
  • Figure 15 is a cross-sectional view of the electrical motor assembly unit of Figure 2 taken along the 4-4 line.
  • Figure 16 is a perspective view of part of an epicyclic gear train suitable for use with the electric motor assembly unit of Figure 2.
  • Figure 17 is a schematic diagram of an example end view of another electric motor assembly unit configured in accordance with the principles of the present disclosure.
  • Figure 18 is a schematic diagram of the epicyclic gear train and related components of the electric motor assembly unit of Figure 2.
  • Figure 19 is a schematic diagram of an alternative arrangement of the epicyclic gear train and related components of the electric motor assembly unit of Figure 2.
  • Figure 20 is a schematic diagram of a cooling system of the electric motor assembly unit of Figure 2.
  • Figure 21 is a perspective view of the stator core of the general type shown in Figure 6 with the further inclusion of an internal passageway.
  • Figure 22 is a view of the stator core of the general type shown in Figure 6 with the further inclusion of internal passageways and spray channels.
  • Figure 23 is a cross-sectional view of the stator core of Figure 22 shown in an installed condition within the axial flux motor of Figure 1.
  • Figure 24 is a perspective view of the stator core of the general type shown in Figure 6 and wire coil, with an intermediate cooling layer disposed therebetween.
  • Figure 25 is a schematic cross-sectional view of the stator core, wire coil, and intermediate cooling layer shown in Figure 24.
  • Figure 26 is a schematic cross-sectional view of the stator assembly of the general type shown in Figures 4 and 11, with cooling channels shown adjacent the radial interior side and the radial exterior side of the wire coil.
  • Figure 27 is a schematic partial cross-section of the motor assembly of Figure 2 in which an end plate with internal cooling passageways is provided.
  • Figure 28 is a schematic partial cross-section of the assembly shown in Figure 27 further illustrating cooling passageways.
  • the present disclosure is directed to an electric motor assembly unit 100 including an electric motor 110 having one or more integrated thermal management components.
  • the electric motor assembly unit 100 extends along a longitudinal axis L between opposite first and second axial ends 102, 104.
  • the electric motor assembly unit 100 has a generally circular cross-sectional area that varies in diameter along the longitudinal axis L. In other examples, however, the electric motor assembly unit 100 can have other cross-sectional shapes (e.g., rectangular, oblong, etc.).
  • the electric motor 110 is an axial flux motor 110. In other implementations, the electric motor 110 is a radial flux motor.
  • the electric motor 110 includes a motor shaft 112, a stator assembly 114, and a rotor assembly 116.
  • the motor shaft 112 extends along the longitudinal axis L of the electric motor assembly unit 100.
  • the rotor assembly 116 is adapted to rotate about the longitudinal axis L relative to the stator assembly 114.
  • the motor shaft 112 is operationally coupled to the rotor assembly 116 to also rotate about the longitudinal axis L while the rotor assembly 116 is rotating.
  • the motor shaft 112 rotates in unison with the rotor assembly 116.
  • the motor shaft 112 rotates at a different gear stage from the rotor assembly 116.
  • a motor housing 118 encloses the stator assembly 114 and the rotor assembly 116.
  • An end portion 113 of the motor shaft 112 projects outwardly from the motor housing 118 along the axis of rotation L.
  • FIGS. 5-7 illustrate an example stator assembly 114 suitable for use with the electric motor 100 described herein.
  • the stator assembly 114 includes multiple electromagnets 120 spaced circumferentially about the axis of rotation L.
  • the electromagnets 120 each include a stator core 122 about which a wire coil 124 is wound (e.g., a copper winding as shown at Figure 7).
  • Figure 6 shows a stator core 122.
  • the stator cores 122 each include a core body 126 which extends along a core axis 128 between first and second opposite axial ends 130, 132 of the core body 126.
  • the first axial ends 130 define first end faces 134 that face in a first axial direction 136 and the second axial ends 132 define second end faces 135 that face in a second axial direction 138 opposite from the first axial direction 136.
  • the wire coils 124 are wound about the core axes 128 and are located between the first and second axial ends 136, 138 of the core bodies 126.
  • the first and second axial ends 130, 132 of each stator core 122 are adapted to define opposite magnetic poles of each corresponding electromagnet 120.
  • FIGS. 8-9 An example rotor assembly 116 suitable for use with the electric motor 100 described herein is shown in FIGS. 8-9.
  • the rotor assembly 116 includes a first magnetic rotor 140 and a second magnetic rotor 142 disposed at opposite axial ends of the stator assembly 114.
  • the first and second magnetic rotors 140, 142 are adapted to rotate in unison with each other about the axis of rotation L.
  • the first and second magnetic rotors 140, 142 are identical to each other.
  • Each of the magnetic rotors 140, 142 is supported by a respective rotor carrier 144 including a rotor plate 146 (e.g., a rotor flange) that projects radially outwardly from a central hub portion 148.
  • the central hub portions 148 of the first and second magnetic rotors 140, 142 are preferably fastened (e.g., bolted) together to define a hub of the rotor assembly 116.
  • the hub can be mounted for rotation relative to the stator cores 122 by one or more rotational bearings 150.
  • the rotational bearings 150 can be mounted between the hub and a sleeve 152 secured at an inner diameter of the stator assembly 114.
  • the electromagnets 120 can be secured about the sleeve 152 by an adhesive material such as a thermally conductive epoxy.
  • the motor shaft 112 is coupled to the rotor assembly 116.
  • the motor shaft 112 can include a flange 113 that is fastened (e.g., bolted) to the hub 148 of the rotor assembly 116.
  • a gear train e.g., an epicyclic gear train as will be described in more detail herein
  • Figure 9 illustrate an example implementation of a magnetic rotor suitable for use as the first magnetic rotor 140 and/or the second magnetic rotor 142.
  • the magnetic rotor 140, 142 includes multiple permanent magnets 154 (e.g., see Figure 10) carried by the rotor plate 148 of the respective carrier 144.
  • the permanent magnets 154 are circumferentially spaced about the axis of rotation L.
  • the permanent magnets 154 of the first magnetic rotor 140 have first permanent magnet end faces 156 positioned to oppose the first axial end faces 134 of the stator cores 122.
  • the permanent magnet end faces 156 are spaced from the first axial end faces 134 of the stator cores 122 by a first air gap.
  • the permanent magnets 154 of the second magnetic rotor 142 have second permanent magnet end faces positioned to oppose the second axial end faces of the stator cores 122.
  • the second permanent magnet end faces are spaced from the second axial end faces of the stator cores 122 by a second air gap.
  • the motor housing 118 encloses the stator and rotor assemblies 114, 116 to form an exterior of the motor assembly unit 100.
  • the motor housing 118 includes first and second axial walls 160, 162 that cover the carriers 144 of the first and second magnetic rotors 140, 142, respectively.
  • the first and second axial walls 160, 162 preferable have a metal (e.g., aluminum) construction.
  • the first axial end wall 160 defines a central opening 164 through which the end portion 113 of the motor shaft 112 extends.
  • the motor housing 118 also includes a circumferential wall that extends between the first and second axial walls 160, 162.
  • the second axial end wall 162 can be unitarily connected with the circumferential wall, while the first axial end wall 160 can be configured as a removable axial end cover.
  • the heat exchanger 166 shares structural supports with the electric motor 110, thereby reducing the overall weight of the electric motor assembly unit 100.
  • the heat exchanger 166 may be structurally supported by the electric motor 110 (e.g., by the stator assembly 114 and/or by the circumferential wall of the motor housing 118).
  • the heat exchanger 166 forms the circumferential wall of the motor housing 118, thereby reducing the number of parts in the system to be manufactured and assembled and reducing overall weight of the system.
  • FIGS. 12-14 illustrates one example environment (e.g., an aircraft propulsion system 200) in which the electric motor assembly unit 100 can be utilized.
  • the propulsion system 200 includes a propeller 202 or other propulsor operationally coupled to a drive shaft 204 driven by the electric motor assembly unit 100.
  • the electric motor assembly unit 100 is disposed within an interior 208 of a nacelle 206 or other body disposed about the drive shaft 204.
  • the propeller 202 spins, the propeller 202 generates air flow that produces thrust for the aircraft.
  • a first portion FI of the air flow produced by the propeller 202 enters an open end 210 of the nacelle 206 and flows towards the electric motor assembly unit 100.
  • the electric motor assembly unit 100 is disposed within the nacelle 206 in line with the first portion FI of the air flow. Accordingly, the first portion FI of the air flow aids the heat exchanger 166 in dissipating heat by flowing through the heat exchanger 166 and carrying the heat away from a coolant pathway 172, discussed in more detail below.
  • a second portion F2 of the air flow produced by the propeller 202 flows around the nacelle 206.
  • the first portion FI is substantially smaller than the second portion F2.
  • multiple electric motors 110 may cooperate to apply torque to the drive shaft 204.
  • Each electric motor 110 may have a respective heat exchanger 166.
  • the heat exchangers 166 may be arranged to allow the first portion FI of the air flow to reach each of the heat exchangers 166 (e.g., arranged so that none of the heat exchangers 166 blocks any of the other heat exchangers 166).
  • a first electric motor 110a is disposed in line with a second electric motor 110b and a third electric motor 110c.
  • Each of the electric motors 110a- 110c has a respective heat exchangers 166a- 166c that extends along only part of a circumference of the electric motor 110a- 110c.
  • the heat exchangers 166a, 166b, 166c can be circumferentially staggered so that an axial end face of each heat exchanger 166a, 166b, 166c is accessible to the first air flow FI.
  • the coolant pump 180 can be integrated into the electric motor assembly unit 100.
  • the coolant pump 180 can be mounted directly to the electric motor 100 (e.g., to the motor shaft 112).
  • the coolant pump 180 can be operated by rotation of the motor shaft 112.
  • the coolant pump 180 drives the coolant based on the speed at which the rotor assembly 116 is rotating relative to the stator assembly 114. In other implementations, however, the coolant pump 180 can be operationally coupled to the rotor assembly 116 via a gear train to change the torque and/or speed applied to the coolant pump 180.
  • the coolant pump 180 can be operationally coupled to the rotor assembly 116 via an epicyclic gear train 190.
  • the epicyclic gear train 190 includes a sun gear 192 that meshes with a plurality (e.g., three) planetary gears 194 that surround the sun gear 192.
  • the planetary gears 194 mesh with inner teeth 195 of a surrounding ring.
  • the inner teeth 195 are disposed on the interior face of a sleeve or hub area defined by the rotor assembly 116 within which the epicyclic gear train 190 is disposed.
  • the planetary gears 194 are held in position around the sun gear 192 by a gear housing 196 relative to which the planetary gears 194 rotate.
  • the gear housing 196 which functions as a carrier for the planetary gears 194, may be rotationally fixed relative to the stator assembly 114 and/or to the motor housing 118.
  • the epicyclic gear train 190 is disposed within the electric motor 110.
  • the epicyclic gear train 190 may be disposed inside of the rotor assembly 116.
  • the central hub portion 148 of the magnetic rotors 140, 142 may include inner teeth to form the surrounding ring of the epicyclic gear train 190.
  • the sun gear 192 spins at a different speed and/or with a different torque from the rotor assembly 116. If the motor shaft 112 is directly coupled to the rotor assembly 116, then the sun gear 192 spins at a different speed and/or with a different torque from the motor shaft 112.
  • the sun gear 192 may include a shaft 198 that extends outwardly from the sun gear 192 along an axis of rotation of the sun gear 192.
  • the axis of rotation of the sun gear 192 is the longitudinal axis L of the electric motor assembly unit 100.
  • the shaft 198 couples to the coolant pump 180 (e.g., see Figure 15).
  • the coolant pump 198 may be coupled to the sun gear 192 to optimize the rotational speed of the pump for efficiency and weight.
  • a motor shaft 112 that is coupled to rotate in unison with the rotor assembly 116 extends from an opposite side of the electric motor 110 from the coolant pump 180 (e.g., see Figure 4).
  • the coolant pump 180 may be coupled to rotate in unison with a carrier turned by the planetary gears 194.
  • the coolant pump 180 may be embedded within the motor shaft 112.
  • the motor shaft 112 may be defined by the shaft 198 of the sun gear 192 (e.g., see Figure 8).
  • the coolant pump 180 may be coupled to rotate in unison with the rotor assembly 116, as is shown at Figures 11 and 19.
  • the epicyclic gear train 190 may be used to interconnect the rotor assembly 116 with the motor shaft 112 such that the output speed/torque of the motor shaft 112 is different than the output speed/torque of the rotor assembly 116 as also shown at Figures 11 and 19.
  • an electric drive 178 for the electric motor 110 can be integrated with the electric motor assembly unit 100.
  • the electric drive 178 may share thermal management with the electrical motor 110.
  • the electric drive 178 may be disposed towards an inner circumferential surface of the heat exchanger 166. Coolant routed to the heat exchanger 166 may pass by the electric drive to collect heat.
  • the electric drive 178 may be mounted to a cooling jacket that extends over part of a circumference of the electric motor 110 (e.g., see Figure 17). The heat exchanger 166 may extend over a remainder of the circumference of the electric motor 110.
  • the motor housing 118 may include a cover that extends over the electric drive 178 between circumferential edges of the heat exchanger 166.
  • Examples of how the electric drive 178 can be suitable mounted to an exterior of the electric motor 110 are shown and described in U.S. Provisional Application No. 62/946,172, filed December 10, 2019, and titled “Cooling Jacket Integrated with Cold Plate,” and in PCT Application Serial Number PCT/EP2020/025570 filed on December 10, 2020, the disclosures of which are hereby incorporated herein by reference in its entirety.
  • a cooling system 170 is shown in which the coolant pump 180 circulates a working fluid (e.g. water, glycol, and oil, etc.) between the heat exchanger 166, where the working fluid is cooled by air flowing through the heat exchanger, to various components within the motor assembly 110, where the working fluid absorbs heat from the components.
  • the heat exchanger 166 has an exchanger housing 168 and a coolant pathway 172 routed within the exchanger housing 168.
  • one or more cooling plates or fins 171 form part of the heat exchanger 166 and the coolant pathway 172 delivers heated coolant to the cooling plates or fins 171.
  • the coolant pathway 172 may extend through a monolithic structure (e.g., a corrugated structure) within the exchanger housing 168.
  • the monolithic structure forms the exchanger housing 168.
  • the heat exchanger 166 extends around a full circumference of the electric motor 110 (e.g., of the stator assembly 114). In other implementations, the heat exchanger 166 may extend over only a section of the circumference.
  • a cooling jacket 167 including circumferential internal passageways 167a surrounding the stator assembly 114 may extend around the remainder of the circumference to form the motor housing 118. Additional details of cooling jacket configurations are further shown and described in United States Provisional Patent Application Serial Number 62/931,712 filed on November 6, 2019 and entitled “Axial Flux Motor with Cooling Jacket”, and in PCT Application Serial Number PCT/EP2020/025497 filed on November 6, 2020, the entireties of which are incorporated by reference herein.
  • the coolant pathway 172 through the exchanger housing 168 is fluidly coupled to another coolant pathway 174 through the electric motor 110 leading to a coolant pump 180.
  • the coolant pathway 174 extends through channels defined in the motor housing 118.
  • the coolant pathways 174 extend through components contained within the motor housing 118.
  • the coolant pump 180 cycles the coolant through the coolant pathways 172, 174. Because the heat exchanger 166 forms part of the motor housing 118, the coolant pathways 172, 174 are designed to fluidly couple together within the electric motor 110.
  • the coolant pathway 172 functions to dissipate heat for the working fluid flowing through coolant pathway 172 while coolant pathway 174 functions to absorb heat from the internal components of the electric motor 110.
  • the coolant pump 180 is connected to the coolant pathways 172, 174 by supply and return branches 172a, 172b, 174a, 174b, which in turn are connected to further supply and return branches to cool various components of the motor 110.
  • the supply and return branches 172a, 172b, 174a, 174b extend radially and/or circumferentially such that the working fluid can be distributed throughout the entire motor 110.
  • multiple supply and return branches 172a, 172b, 174a, 174b are radially distributed at various locations in the motor 110 such that the working fluid can be distributed to various cooling circuits throughout the motor 110.
  • the coolant pathway 172 defines a cooling circuit 220 connected to the supply and return branches 172a, 172b, wherein the cooling circuit 220 is formed by a plurality of internal passageways 220a defined within the heat exchanger 166 of the motor 120.
  • the heat exchanger 166 is configured with fins, ribs, or other surface area-maximizing features to allow air flowing by the motor 110 to cool the cooling heat exchanger 130, thereby aiding in removing heat from the working fluid within the internal passageways 220a. Accordingly, the heat exchanger 166 can be configured to function as an air- to-liquid heat exchanger.
  • cooling circuits 222, 224, 226, and 228 are also shown as being connected to the supply and return branches 174a, 174b.
  • the cooling circuit 222 is shown as including internal passages 222a adjacent the interior side of the wire coil 124 such that heat can be transferred from the wire coil 124 to the working fluid.
  • the cooling circuit 224 is shown as including internal passages 224a within and/or about each of the stator core bodies 122 such that heat can be transferred from the wire coils 124 to the stator core bodies 122 and then to the working fluid.
  • the cooling circuit 226 is shown as including internal passages 226a adjacent the exterior side of the wire coil 124 such that heat can be transferred from the wire coil 124 to the working fluid.
  • the cooling circuit 224 and internal passageways 226a are defined as the above-described cooling jacket 167 and internal passageways 167a.
  • the cooling circuit 228a is shown as including internal passages 228a adjacent the exterior side of the epicyclic gear train 190 such that heat can be transferred from the epicyclic gear train 190 to the working fluid.
  • the warmed or heated working fluid can be circulated from the cooling circuits 222, 224, 226, 228 to the cooling circuit 220 where the fluid can be cooled and then returned back to the circuits 222, 224, 226, 228 via the pump 180.
  • the cooling system 110 is shown as being provided with pathways 172, 174 and circuits 222, 224, 226, 228, other configurations including more or fewer circuits are possible without departing from the concepts disclosed herein.
  • the cooling system 170 can be provided with a plurality of branches which are routed in parallel to each other and connected to the pump 180, for example by a manifold, in order to reduce pressure drop losses of the cooling fluid.
  • an external heat exchanger can be used in conjunction with or instead of the cooling circuit 220.
  • the motor 110 can be further provided with a sump 175 connected to the return branch or branches 172b, 174b, whereby heated cooling fluid, for example sprayed fluid, can be collected and returned to the pump 180.
  • an individual stator core body 126 is shown in isolation to illustrate features of the stator core 122 forming part of the cooling circuit 224.
  • an internal passageway 224a of the cooling circuit 224 is routed through the stator core body 126 with inlet and outlet ends 224b, 224c extending through the end face 135.
  • the cooling circuit 224 includes further passages or branches that extend between the inlet and outlet ends 224b, 224c of each stator core 122 and the branches 174a, 174b, as schematically illustrated at Figures 11 and 20.
  • the cooling circuit 224 includes multiple sub-circuits associated with each stator core body 126, wherein the inlets and outlets 224b, 224c are connected together such that pumped working fluid is delivered to each stator core body 126.
  • Figure 21 schematically shows the routing of the passageway 224a as being a single U-shaped passageway, it should be understood that passageway 224a can include a plurality of passageways that are provided in any number of various shapes, for example serpentine shapes.
  • the passageway 224a can further include a plurality of inlet and outlet ends 224b, 224c as well.
  • the passageways 224a can include larger cavities within the stator core body 126 such that the interior of the stator core body 126 is essentially flooded with cooling fluid.
  • stator core bodies 126 of the stator assembly 114 By providing one or more internal passageways 224a within the stator core bodies 126 of the stator assembly 114, the working fluid can remove heat very close to the heat-generating wire coils 124 for improved cooling of the motor 110. It is noted that the shape of the stator core bodies 126, and the number of stator core bodies 126 provided in the motor 110, may vary from what is shown in the drawings without departing from the concepts presented herein.
  • the stator core body 126 of Figure 21 can be manufactured by various means.
  • a solid stator core body 126 for example a solid metal stator core body, could be initially formed and then later machined to form the internal passageways 224a, inlet 224b, and outlet 224c with drills or other tools.
  • the stator core body 126 can also be formed through the use of additive manufacturing techniques.
  • FIG 22 an individual stator core 122 is shown in isolation to illustrate further features of the stator core body 126 forming part of the cooling circuit 224.
  • Figure 23 shows a cross-sectional view of the stator core body 126 shown in Figure 22 in an installed environment with a wire coil 124 wrapped about the stator core body 126.
  • the stator core 122 of Figures 22 and 23 includes an internal passageway 224a.
  • the internal passageway 224a includes four internal passageways extending to inlet ends 224b on the end face 135 of the stator core body 126.
  • the passageways 224a can be internally connected within the stator core body 126 such that only a single inlet 224b results.
  • the passageways 224a are further provided with a plurality of outlet ports 224c arranged along the length of the passageways 224a and through opposite sides 126a, 126b of the stator core body 38.
  • the outlet ports 224c may be provided on a single side 126a, 126b or on both sides 126a, 126b of the stator core body 126.
  • the outlet ports may also be provided on the opposite sides adjacent the sides 126a, 126b.
  • the outlet ports 224c can be characterized as nozzles.
  • the cooling fluid is sprayed or otherwise directed onto the wire coils 124 and the adjacent magnets as the cooling fluid exits the outlet ports 224c.
  • shape of the stator core body 126, and the number of stator core bodies 126 provided in the motor 110 may vary from what is shown in the drawings without departing from the concepts presented herein. With the disclosed approach, as the cooling fluid comes into direct contact with the heat-generating wire 124, improved heat transfer and overall cooling of the motor 110 results.
  • the cooling circuit 224 includes further passages or branches that extend between the inlet and outlet ends 224b, 224c of each stator core 122 and the branches 174a, 174b, as schematically illustrated at Figures 11 and 20. Accordingly, the cooling circuit 224 includes multiple sub-circuits associated with each stator core body 126, wherein the inlets and outlets 224b, 224c are connected together such that pumped working fluid is delivered to each stator core body 126.
  • the stator core bodies 126 of Figures 22 and 23 can be manufactured by various means.
  • a solid stator core body 126 for example a solid metal stator core, could be initially formed and then later machined to form the internal passageways 224a, inlets 224b, and outlets 224c with drills or other tools.
  • the stator core body 126 of Figures 22 and 23 can also be formed through the use of additive manufacturing techniques.
  • FIG. 24 and 25 an individual stator core body 126 and wound wire coil 124 are shown in isolation to illustrate further features of the stator assembly 114 that can form part of the cooling circuit 224.
  • the stator core body 126 of Figures 24 and 25 can be configured as generally shown at Figure 6.
  • an intermediate cooling layer 230 is wrapped about the sides 126a, 126b, 126c, 126d of the stator core body 126 such that the intermediate cooling later 230 resides between and is adjacent to the wire coil 124 and the stator core body 126. Accordingly, the intermediate cooling layer 230 is in very close proximity to both the stator core body 126 and the winding 124 for maximized heat transfer.
  • the intermediate cooling layer 230 may also be referred to as a cooling wrap arrangement.
  • the intermediate cooling layer 230 accommodates the shape of the stator core/tooth 126 and can be manufactured from one or from multiple pieces.
  • the intermediate cooling layer 230 has a main body 230a with internally embedded passageways (e.g. micro-channels) 230b which are fed by one or more inlets and outlets 230c, 230d. Accordingly, the working fluid from the cooling system 170 can be directed through the internal passageways 230b to allow heat to be transferred from the winding 124 to the working fluid.
  • the main body 230a can also be provided with separators 232e that are part of the main body 230a and that can extend between each individual coil to increase the surface area that is in direct contact with the coil 124. Additional geometry modifications can be added to the intermediate cooling layer 230 to facilitate an optimal design.
  • This intermediate cooling layer 230 can also serve the purpose of an insulating material. Ideally this material would have high thermal conductivity for optimal thermal performance and have high dielectric strength for high voltage capability, for example a thermally conductive, silicone based material.
  • the intermediate cooling layer 230, including the internal cooling passages 230b, main body 230a, inlet and outlets 230c, 23 Od, and separators 23 Oe can be made with via an additive manufacturing process, but other manufacturing methods are not excluded.
  • the cooling circuit 224 includes further passages or branches that extend between the inlet and outlet ends 224b, 224c of each stator core intermediate cooling layer 230 and the branches 174a, 174b, as schematically illustrated at Figures 11 and 20. Accordingly, the cooling circuit 224 includes multiple sub-circuits associated with each stator core body 126, wherein the inlets and outlets 224b, 224c are connected together such that pumped working fluid is delivered to each stator core intermediate cooling layer 230.
  • FIG. 18 a schematic cross-sectional view is presented showing a stator assembly 114 with stator cores 122 and windings 124 with additional features that can form part of the cooling circuits 222, 226.
  • the cooling circuit 222 is formed as a circumferential annulus or ring located proximate the radial interior sides of the windings 124 of the stator cores 122 while the cooling circuit 226 is also formed as a circumferential annulus or ring located proximate the radial exterior sides of the windings 124 of the stator cores 122.
  • the cooling circuits 222, 226 are formed by a thermally conductive material, such as epoxy, for maximum heat transfer from the windings 124 to the cooling fluid in the passageways 222a, 226a of the cooling circuits 222, 226.
  • a thermally conductive material such as epoxy
  • epoxy is applied directly onto the windings 124 to form a body 222b, 226b within which the windings 124 are embedded and within which the internal passageways 222a, 226a are also formed.
  • a housing for example housing 168, may be provided to provide structural rigidity and inlet/outlet ports as well as other features, but the housing 168 in this case does not have to contain the cooling passages 226a.
  • the cooling passages 222a, 226a shown in Figure 26 may be designed to flow in any direction.
  • a motor 110 and associated cooling system 170 can be configured to include only the cooling circuit 222, only the cooling circuit 226, or both cooling circuits 222, 226.
  • the cooling circuit 222 depicted at Figure 26 may be used with a construction involving a circuit 226 including the cooling jacket 167 and passageways 167a shown at Figures 4 and 20.
  • cooling passages 222a, 226a within the respective body 222b, 226b there are multiple possible ways of manufacturing the cooling passages 222a, 226a within the respective body 222b, 226b. For example, one way would be to utilize a soluble material that is embedded into the thermally conductive material 222b, 226b and then dissolving the soluble material to create cavities 222a, 226a. Another alternative would be to embed highly thermally conductive tubes into the thermally conductive material and then utilize those tubes as cooling passages 222a, 226a. Other ways to manufacture such a machine/stator are not excluded.
  • FIG. 27 and 28 a schematic cross-sectional view is presented showing an a stator assembly 114 with stator cores 122 and windings 124 with additional features that can form an additional cooling circuit 170 that works in conjunction with the cooling jacket 167 disclosed in the configuration shown at Figure 4 and 20.
  • the cooling circuit 226 and respective passageways 226a can be provided in the form of a cooling jacket 167 and internal passageways 167a.
  • cooling plate 20 can include an interconnecting passageways, for example passageway 250c, to place the internal passageways 167a of the cooling jacket 167 in fluid communication with the internal cooling channels 250a, 252a.
  • passageway 250c to place the internal passageways 167a of the cooling jacket 167 in fluid communication with the internal cooling channels 250a, 252a.
  • the internal channels 250a, 250b may be interconnected to the internal passageways 167a at multiple locations 250c such that the length of any given channel or passageway is minimized, thereby reducing the associated pressure drop the pump 180 must overcome.
  • the passageways 250a, 252a can be routed in a variety of ways, for example the passageways 250a, 252a can be provided with a serpentine shape or a spiral shape.
  • the cooling system 170 can include a single cooling end plate 250, 252 as well.
  • the cooling end plates are formed from a polymeric or plastic material, for example, a thermoplastic material such as a polyether ether ketone (PEEK).

Abstract

Un moteur électrique à flux axial peut comprendre un ensemble moteur comprenant un arbre de moteur, un ensemble stator et un ensemble rotor. L'ensemble stator peut comprendre une pluralité de noyaux de stator autour desquels une bobine de fil est enroulée, un ou plusieurs des noyaux de stator comprenant un corps de stator ayant un passage de fluide interne pour recevoir un fluide de refroidissement.
PCT/EP2021/025065 2020-02-21 2021-02-19 Moteur électrique à système de refroidissement intégré WO2021164944A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US202062979966P 2020-02-21 2020-02-21
US202062979849P 2020-02-21 2020-02-21
US62/979,966 2020-02-21
US62/979,849 2020-02-21

Publications (1)

Publication Number Publication Date
WO2021164944A1 true WO2021164944A1 (fr) 2021-08-26

Family

ID=74844867

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/025065 WO2021164944A1 (fr) 2020-02-21 2021-02-19 Moteur électrique à système de refroidissement intégré

Country Status (1)

Country Link
WO (1) WO2021164944A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113964966A (zh) * 2021-10-28 2022-01-21 中国第一汽车股份有限公司 一种定子组件及其制造方法、轴向磁通电机
GB2613631A (en) * 2021-12-10 2023-06-14 Epropelled Ltd Aircraft electric propulsion

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140009025A1 (en) * 2012-07-06 2014-01-09 Persimmon Technologies Corporation Hybrid field electric motor
EP3028888A1 (fr) * 2014-12-04 2016-06-08 Atieva, Inc. Système de refroidissement de moteur
CN205407546U (zh) * 2016-03-09 2016-07-27 刘霄 定子浸油散热且转子内置式的盘式电动机
EP3079239A1 (fr) * 2015-04-09 2016-10-12 GE Energy Power Conversion Technology Ltd Stators pour machines électriques
US20170025927A1 (en) * 2014-04-02 2017-01-26 J.H. Beheer B.V. Stator portion for an electric machine comprising an permanent magnet rotor
US20180054094A1 (en) * 2016-08-17 2018-02-22 Atieva, Inc. Motor Cooling System Utilizing Axial Cooling Channels
US20190379257A1 (en) * 2018-06-12 2019-12-12 General Electric Company Electric Motor Having an Integrated Cooling system and Methods of Cooling an Electric Motor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140009025A1 (en) * 2012-07-06 2014-01-09 Persimmon Technologies Corporation Hybrid field electric motor
US20170025927A1 (en) * 2014-04-02 2017-01-26 J.H. Beheer B.V. Stator portion for an electric machine comprising an permanent magnet rotor
EP3028888A1 (fr) * 2014-12-04 2016-06-08 Atieva, Inc. Système de refroidissement de moteur
EP3079239A1 (fr) * 2015-04-09 2016-10-12 GE Energy Power Conversion Technology Ltd Stators pour machines électriques
CN205407546U (zh) * 2016-03-09 2016-07-27 刘霄 定子浸油散热且转子内置式的盘式电动机
US20180054094A1 (en) * 2016-08-17 2018-02-22 Atieva, Inc. Motor Cooling System Utilizing Axial Cooling Channels
US20190379257A1 (en) * 2018-06-12 2019-12-12 General Electric Company Electric Motor Having an Integrated Cooling system and Methods of Cooling an Electric Motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113964966A (zh) * 2021-10-28 2022-01-21 中国第一汽车股份有限公司 一种定子组件及其制造方法、轴向磁通电机
GB2613631A (en) * 2021-12-10 2023-06-14 Epropelled Ltd Aircraft electric propulsion

Similar Documents

Publication Publication Date Title
CN109698574B (zh) 电机
US10038355B2 (en) Electric machine having rotor and stator cooling assembly
EP2573906B1 (fr) Machine électrique à pertes de tourbillonnement réduites
KR101858441B1 (ko) 하이브리드 전기 장치를 냉각하는 모드
US20190027987A1 (en) Electric Machine for a Motor Vehicle
WO2021164944A1 (fr) Moteur électrique à système de refroidissement intégré
EP3629449B1 (fr) Procédé et appareil pour refroidir un ensemble rotor
EP3944472A1 (fr) Module de génération d'énergie intelligent
US11025114B2 (en) Rotor for an electric machine
CN111864992A (zh) 冷却装置、电机及风力发电机组
US11970973B2 (en) Electric machine cooling of stator with tube
US20220416613A1 (en) Electric motor with integrated cooling system
US20230082277A1 (en) Electric motor with integrated cooling system
WO2021164946A1 (fr) Moteur électrique à système de refroidissement intégré
EP4175130A1 (fr) Moteur électrique d'aéronef doté d'un système de refroidissement intégré
US11621610B2 (en) Cooling assembly for an electric machine
WO2007102740A1 (fr) Dispositif de refroidissement de moteurs electriques
EP2918003B1 (fr) Procédé et dispositif de refroidissement par liquide d'un moteur électrique
US20230074332A1 (en) Integrated electric motor and thermal management system
US20230143600A1 (en) Aircraft electric motor
US11817761B2 (en) Aircraft electric motor
US20230142019A1 (en) Aircraft electric motor
US20110221288A1 (en) System and method for cooling in electric machines
RU2741053C1 (ru) Вентильно-индукторный двигатель с независимым возбуждением с жидкостной системой охлаждения
US20220302795A1 (en) Cooling a rotating electrical machine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21708933

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21708933

Country of ref document: EP

Kind code of ref document: A1