• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE1050508A1
    申请号:SE1050508
    申请日:2010-05-21
    公开日:2011-11-22
    发明作者:Pontus Karlsson；Viktor Lassila
    申请人:Bae Systems Haegglunds Ab；
    IPC主号:
    专利说明:

    A problem with such an electric motor is that the winding temperature becomes too high, whereby the performance of the electric motor deteriorates.
    Furthermore, it is difficult to get good contact between the electric motor's stator and the housing, which leads to a certain amount of air between them and thereby leads to increased winding and housing without the cooling significantly impairing the heat transfer, which temperature difference between satisfactory and thus poorer performance.
    OBJECT OF THE INVENTION A further object of the present invention is to provide a cooling device for electric motor which enables efficient cooling, compact design of electric motor, and simple and cost-effective construction.
    SUMMARY OF THE INVENTION This and other objects, which appear from the following description, are achieved by means of a cooling device for electric motor, electric motor and a motor vehicle of the kind initially indicated and further having the features set forth in the characterizing part of appended independent claims 1, 9 and 10. Preferred embodiments of the cooling device are defined in appended dependent claims 2-8.
    According to the invention, the object is achieved with a device for cooling an electric motor, which electric motor comprises a stator molded with a thermally conductive thermosetting plastic, a housing arranged to enclose the stator, the device comprising at least one cooling channel in which a liquid cooling medium is intended to flow for cooling the electric motor. , wherein the housing is arranged to run separated from the stator along a main part of the thermoset-coated mantle surface of the stator to form said cooling channel between the housing and said direct contact thermoset-coated stator which causes a temperature transition from the mantle surface. As a result, the coolant enters with the winding via the thermosetting plastic to the coolant required for dissipation of the heat from the winding, whereby efficient cooling is consequently obtained.
    By cooling directly on the thermally conductive thermosetting plastic, good thermal contact between stator winding and the liquid coolant is guaranteed. Furthermore, thanks to the efficient cooling, it is possible to reduce the radial spread of the cooling duct while maintaining the cooling effect and consequently reduce the radius of the electric motor including housing and thus obtain a more compact electric motor unit which frees up space when installed in vehicles. Since the housing is arranged to run separately along a larger part of the thermoset-coated stator, the electric motor can be designed as a so-called frameless motor, ie. an electric motor without a housing, the electric motor being connected to a housing for forming a cooling duct.
    Hereby, an electric motor with stator molded into said thermoset and rotor with fixed interface to rotor shaft can be manufactured separately by a supplier while the housing can be designed in the vehicle, where the housing can for example be integrated with other housings such as gearbox housing resulting in reduced costs for purchasing and installing electric motor. reduced costs in total production of the vehicle.
    According to an embodiment of the device, said thermosetting plastic consists of a heat-conducting epoxy. Epoxy with such properties as liquid-tight, heat-conducting, curing, heat-resistant and adhesive constitutes an excellent thermosetting plastic for this purpose.
    According to an embodiment of the device, said liquid cooling medium consists essentially of water. With water as the liquid cooling medium, a very good cooling is obtained.
    According to an embodiment of the device, the housing is sealed by means of sealant to said thermosetting plastic at the respective end area of the stator.
    This avoids leakage of the liquid refrigerant. According to an embodiment of the device, said liquid cooling medium is arranged to flow substantially axially in said cooling channel.
    According to one embodiment, the device comprises support elements arranged to run axially between the housing and the thermoset-coated stator forming axial cooling channel portions of said cooling channel. This prevents the housing from sagging and thus reduces the cooling duct space. Furthermore, by distributing the refrigerant in cooling duct portions, control of the refrigerant is obtained.
    According to an embodiment of the device, said liquid medium is arranged to flow substantially circumferentially in said cooling channel.
    According to one embodiment, the device comprises support elements arranged to run in circumferential direction between the housing and the thermoset-covered stator forming circumferentially extending cooling channel portions of said cooling channel. This prevents the housing from sagging and thus reduces the cooling duct space. Furthermore, by distributing the refrigerant in cooling duct portions, control of the refrigerant is obtained.
    DESCRIPTION OF THE DRAWINGS The present invention will be better understood with reference to the following detailed description read in conjunction with the accompanying drawings, in which like reference numerals refer to like parts throughout the many views, and in which: Fig. 1 schematically shows a side view of a motor vehicle; Fig. 2 schematically shows an axial cross-sectional view of an electric motor according to an embodiment of the present invention; Figs. 3a and 3b schematically show an axial and radial cross-sectional view, respectively, of an electric motor according to an embodiment of the present invention; Fig. 4 schematically shows a side view of a cross section of a part of an electric motor according to an embodiment of the present invention; Fig. 5 schematically shows a view in the axial propagation direction of a part of an electric motor according to an embodiment of the present invention; DESCRIPTION OF EMBODIMENT FORVIVES Referring to Fig. 1, a side view of a motor vehicle 1 is shown. The vehicle may be a heavy vehicle, such as a work vehicle or military vehicle. The vehicle can be a wheeled vehicle or a tracked vehicle. The vehicle can alternatively be a car. The vehicle 1 comprises at least one electric motor comprising a device for cooling the electric motor according to one of the embodiments below.
    Fig. 2 schematically shows a side view of an axial cross-section of an electric motor 10 and Figs. 3a and 3b show an axial and radial cross-sectional view, respectively, of an electric motor according to an embodiment of the present invention.
    The electric motor 10 comprises a rotor 20 and a stator 30, said rotor 20 being connected to a drive shaft 22 and arranged to rotate said drive shaft 22.
    The rotor shaft 22 is arranged to run concentrically relative to the rotor 20, the rotor being arranged to enclose the rotor shaft 20. The rotor 20 is according to a variant built up of stacked rotor plates 20a. The rotor 20 comprises magnets 24 arranged peripherally of the rotor 24.
    The stator 30 is arranged to enclose the rotor 20, the rotor shaft 22 and consequently the rotor 20 being arranged concentrically relative to the stator 30. The outer surface of the rotor 20 is arranged close to and separated from the inner surface of the stator 30. The stator 30 is according to a variant built of stacked stator plates 30a. The stator 30 comprises a stator winding 32 comprising a set of electrically conductive wires 32a, preferably copper wires, through which a current is arranged to be conducted for driving the electric motor 10. Said stator winding 32 is arranged to run axially so that the winding adjoins the rotor .
    Copper trees 32a of the winding 32 are according to a variant arranged to run axially in compartments / recesses 34 of the stator plates 30a and are led out from end portions of the stator 30 and back into another compartment / other recess 34 of the stator plates 30a.
    The stator 30 is cast in an adhesive liquid-tight, heat-conducting and heat-resistant thermosetting plastic E, which is preferably epoxy E. In this case, the stator 30 is externally coated with said thermosetting plastic E. In this case, the mantle surface of the stator is coated with said thermosetting plastic E the stator is trained.
    A housing 40 or housing 40 is arranged adjacent the electric motor 10 to enclose the electric motor 10 including the stator 30 of the electric motor. The housing 40 is arranged to run separately from the mantle surface of the stator along a substantial portion of the thermoset coated stator 30 forming a cooling channel 50 between the housing and the the stator 30 is clad by means of said thermosetting plastic E. The housing 40 is consequently arranged to run separated from the stator 30 along a main part of the thermosetting plastic clad mantle surface 35 of the stator for forming said cooling channel 50 between the housing and said mantle surface 35.
    The housing 40 is according to this embodiment arranged to run separated from the jacket surface 35 along substantially the entire thermoset coated surface 35 of the stator 30 forming said cooling channel 50. The housing 40 is consequently arranged so that a cooling channel 50 is formed between the housing 40 and the thermosetting stator 30 so that a cooling medium flowing in the cooling channel 50 comes into direct contact with the thermoset coated surface 35 of the stator 30, i.e. comes into direct contact with the thermoset E.
    Because the stator 30 is coated with liquid-tight, heat-conducting thermosetting plastic E, water can advantageously be used as a liquid cooling medium, which enables efficient cooling. The housing 40 is sealedly connected to said thermoset by means of sealant 60 at the respective end region of the stator 30. The sealant 60 is constituted according to a variant of seals, wherein said seals according to a variant consist of O-ring.
    The sealant 60 consists according to a variant of adhesive material with sealing properties. According to a variant, the sealing means 60 consists of a fitting means intended to ensure that the surfaces between the stator cast in epoxy and the housing have a certain surface fineness and / or shape accuracy. The fitting means comprises a machining arranged in the epoxy surface where the housing is intended to be arranged. In this case, sealing means in the form of an O-ring is preferably arranged in connection with said processing in order to ensure sealing, the O-ring being arranged to be clamped and sealed between the surface of the stator and the surface of the housing.
    The thermoset E is applied to the stator 30 and allowed to cure, with the thermoset E adhering to the stator 30 so that the outer surface of the stator 30 is lined with said thermoset E. After the thermoset E has solidified, the housing 40 is applied so that said cooling channel 50 is formed. By applying the housing 40 afterwards and separately enclosing it along the majority of the thermoset-coated mantle surface 35 of the stator 30, the housing 40 can be designed differently depending on the application, for example the shape of the outside of the housing. In this way, modularity is also obtained, whereby the same electric motor can be used for many applications where only the housing is varied for a new product.
    Furthermore, a so-called frameless electric motor can be manufactured by an electric motor manufacturer, while the housing itself can be manufactured and adapted to run separately along a main part of the thermoset-coated jacket surface, which reduces the costs of production of the vehicle.
    According to one embodiment, said liquid cooling medium is arranged to flow substantially axially in said cooling channel via at least one inlet (not shown).
    Fig. 4 schematically shows a side view of a cross section of a part of an electric motor 10a according to an embodiment of the present invention. This embodiment differs from the electric motor according to the embodiment in Figs. 2 and 3a-b in that radial support elements 52a are arranged to run circumferentially between the housing and the thermoset-coated stator 30 forming circumferentially extending cooling channel portions 50a of said cooling channel 50.
    Fig. 5 schematically shows a cross-sectional view in the axial propagation direction of a part of an electric motor 10b according to an embodiment of the present invention.
    This embodiment differs from the electric motor according to the embodiment in Figs. 2 and 3a-b in that axial support elements 52b are arranged to run axially between the housing and the thermoset-coated stator 30 forming axial cooling channel portions 50b of said cooling channel 50. In one embodiment the cooling medium could flow. in an axially extending cooling duct portion 50b and turning at one end of the electric motor and being led into another axially extending cooling duct portion 50b and flowing countercurrently to the cooling medium in the former cooling duct portion.
    According to one embodiment, said liquid medium is arranged to flow via at least one inlet substantially circumferentially in said cooling duct.
    The cooling duct 50 according to the present invention has a radial extent extending which is adapted to, inter alia, cooling requirements, size of electric motor, desired flow rate of the coolant, temperature of the coolant, etc. The cooling duct may have any suitable configuration including any suitable design of cooling duct portions.
    Housing here refers to an element which encloses the electric motor, where the housing can be of any suitable material and where the term house includes the terms sleeve and housing.
    The housing 40 is according to a variant arranged to support the stator 30. According to a variant, the stator 30 is arranged to be supported by means of another unit of, for example, a vehicle and consequently fixedly arranged separate from the housing 40, but tightly connected to the housing 40. The above description of the preferred the embodiments of the present invention have been provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the invention to the variations described. Obviously, many modifications and variations will occur to those skilled in the art. The embodiments have been selected and described to best explain the principles of the invention and its practical applications, thereby enabling one skilled in the art to understand the invention for various embodiments and with the various modifications appropriate to the intended use.
    权利要求:
    Claims (10)
    [1]
    An electric motor cooling device (10), the electric motor comprising a stator (30) molded with a thermally conductive thermosetting plastic (E), a housing (40) being arranged to enclose the stator (30), the device comprising at least one cooling channel ( 50) in which a liquid cooling medium is intended to flow for cooling the electric motor (10), characterized in that the housing (40) is arranged to run separated from the stator (30) along a main part of the thermoset-coated jacket surface (35) of the stator ( 30) for forming said cooling channel (50) between the housing (40) and said jacket surface (50).
    [2]
    Device according to claim 1, wherein said thermosetting plastic (E) is epoxy.
    [3]
    Device according to claim 1 or 2, wherein said liquid cooling medium consists essentially of water.
    [4]
    Device according to any one of claims 1-3, wherein the housing (40) is tightly connected to said thermosetting plastic (E) by means of sealant (60) at the respective end region of the stator (30).
    [5]
    A device according to any one of claims 1-4, wherein said liquid cooling medium is arranged to flow substantially axially in said cooling channel (50).
    [6]
    Device according to claim 5, comprising support elements (52b) arranged to run axially between the housing (40) and the thermoset-coated stator (30) forming axial cooling channel portions (52b) of said cooling channel (50).
    [7]
    Device according to any one of claims 1-4, wherein said liquid medium is arranged to flow substantially circumferentially in said cooling channel (50).
    [8]
    Device according to claim 7, comprising support elements (52a) arranged to run circumferentially between the housing (40) and the thermoset-coated stator (30) 11 forming circumferentially extending cooling channel portions (50a) of said cooling channel (50).
    [9]
    Electric motor (10) comprising a cooling device according to any one of the preceding claims.
    [10]
    Motor vehicle (1) comprising at least one electric motor (10) according to claim 9.
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    同族专利:
    公开号 | 公开日
    SE534838C2|2012-01-17|
    SG185384A1|2012-12-28|
    US20130209239A1|2013-08-15|
    JP2013527740A|2013-06-27|
    ZA201208230B|2013-07-31|
    AU2011256862B2|2014-12-11|
    EP2572438A1|2013-03-27|
    US9518477B2|2016-12-13|
    KR20130108986A|2013-10-07|
    KR101820804B1|2018-01-22|
    WO2011146005A1|2011-11-24|
    CN102906972A|2013-01-30|
    AU2011256862A1|2012-11-15|
    EP2572438A4|2017-01-04|
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    优先权:
    申请号 | 申请日 | 专利标题
    SE1050508A|SE534838C2|2010-05-21|2010-05-21|Electric motor cooling device|SE1050508A| SE534838C2|2010-05-21|2010-05-21|Electric motor cooling device|
    SG2012080479A| SG185384A1|2010-05-21|2011-05-18|Cooling device for electric motor|
    PCT/SE2011/050625| WO2011146005A1|2010-05-21|2011-05-18|Cooling device for electric motor|
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