• 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:
    The present invention relates to a device (I; II; III) for an electric motor (1) with a rotor (10) and a stator (20; 120; 220; 320). The stator is provided with circumferential parts of the stator (122; 222; 322) distributed between it, forming spaces (S) for stator winding (22). Said goods portions are arranged to support stator winding (22), means (130; 230; 330; 430) being provided for holding the stator winding in a space thus formed (S) in place and for providing a short-circuit protection function for the stator winding (22) in said space (S). The means (130; 230; 330; 430) comprises cooling means (132; 232; 332; 432) which are in heat-conducting contact with a back portion (125; 225; 325) of said stator for cooling purposes. The invention also relates to a platform (Fig. 3)
    公开号:SE1550484A1
    申请号:SE1550484
    申请日:2015-04-23
    公开日:2016-10-24
    发明作者:Lassila Viktor
    申请人:BAE Systems Hägglunds AB；
    IPC主号:
    专利说明:

    TECHNICAL FIELD The invention relates to a device for an electric motor according to the preamble of claim 1. The invention also relates to a motor vehicle.
    BACKGROUND During operation, electric motors are heated, whereby cooling is required to dissipate the heat.
    Traditionally, a lot of heat is transported out of the winding through the back of the stator to the electric motor housing. This means that the winding, in a cross section of the motor, will be warmest in the middle.
    When heat from the winding is to be transported out through the back of the stator, it will have to pass several thermal barriers, since each winding wire has an insulating layer. The stator winding usually consists of a lacquered, insulated conductor, normally copper. In this case, barriers in the form of copper / lacquer, lacquer / copper, lacquer / lacquer need to be crossed. This means that there will be a significant temperature gradient in the track.
    In traditional electric motor manufacturing, the winding of the stator requires a lot of manual work. One way to automate the winding process is to wind each stator tooth separately, either with a preformed winding or by means of a robot that winds the winding around one tooth at a time.
    With such automated winding, especially with preformed winding twists, it is difficult to get a good filling factor in each groove. This further degrades heat transfer.
    In an electric motor, there is usually a wedge at the far end of the groove to lock the winding so that it cannot end up in the air gap and come into contact with the rotor.
    EP1215801 discloses a device for an electric motor with a T-shaped ki | provided spaces in the stator to facilitate circulation of cooling oil. The T-shaped wedge is preferably made of an elastic material to improve the seal in the space. The T-shaped wedge is according to a variant made of resin which is an insulator. The purpose of the bone of the wedge is to reduce the cross-sectional area of the cooling passage for the cooling oil for improved cooling. The leg of the wedge is intended to create a barrier in the space and thereby create two cooling channels in the same space.
    OBJECT OF THE INVENTION An object of the present invention is to provide a device for a single motor which enables efficient cooling of the electric motor.
    SUMMARY OF THE INVENTION These and other objects, which appear from the following description, are achieved by means of a device of initially stated kind and furthermore exhibit the features stated in the characterizing part of appended independent claims 1. Furthermore, the objects are achieved by means of a platform embodiment. the platform is defined in the appended dependent claims 2-6 and 8.
    According to the invention, the objects are achieved with a device for an electric motor with a single rotor and a stator. The stator is provided with circumferential parts of the stator distributed between them, forming spaces for stator winding. Board goods portions are arranged to support stator winding, means being provided for holding the stator winding in a space thus formed in place and for offering a short-circuit protection function for the stator winding in said space. Said means comprise cooling means which are in heat-conducting contact with a back portion of said stator for cooling purposes. Through cooling means in thus heat-conducting contact with the back portion of the stator, a single heat-transporting barrier is formed, which means that the heat does not have to pass the same number of thermal barriers in the form of layers of insulation, which reduces the temperature gradient in the groove. By thus transporting heat, a more efficient cooling of the electric motor is maintained. An electric motor with a sole-configured device is well suited for an automated winding process where each stator tooth is wound separately, either with a preformed winding or by means of a robot which wraps the winding around a tooth, where the filling factor in each space / groove is relatively low.
    According to an embodiment of the device, said cooling means radially adjacent the stator include heat-conducting portions of said means. This maintains efficient heat transport in the space.
    According to an embodiment of the device, said means are formed with portions with a substantially T-shaped cross-section across the stator winding. This enables both efficient retention of the stator winding in the space, as well as effective short-circuit protection function cooling of the stator winding by heat transport.
    According to an embodiment of the device, said cooling means comprise stator back portions running radially from the stator ridge. This enables efficient utilization of the stator backbone to create a heat-transporting barrier.
    According to one embodiment of the device, said radially extending stator ridge portions include said portions with a substantially T-shaped cross-section. By thus constructing the stator back with portions with a T-shaped cross-section in the opening, efficient retention of the stator winding in the space, short-circuit protection function and efficient cooling of the stator winding by heat transport by means of the stator back are made possible. Consequently, the entire function is performed with short circuit, retention and heat transport / cooling with one and the same piece of the stator back.
    According to a short-circuit protection function arranged to be provided by means of portions of an embodiment of the device, said means are arranged to separate stator winding portions in said space. Hereby an effective short-circuit protection function is provided. According to an embodiment of the device, said cooling means comprise axially running channels for flow of cooling medium. This enables efficient cooling by means of coolant in the form of, for example, oil without the air gap at the side of the stator facing the rotor having to be sealed.
    DESCRIPTION OF THE DRAWINGS The present invention will be better understood by 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 illustrates a platform according to an embodiment of the present invention; Fig. 2 schematically illustrates an axial cross-sectional view of an electric motor according to an embodiment of the present invention; Fig. 3 schematically illustrates a radial cross-sectional view of a part of an electric motor with an electric motor device according to an embodiment of the present invention; Fig. 4 schematically illustrates a radial cross-sectional view of a part of an electric motor with an electric motor device according to an embodiment of the present invention; Fig. 5 schematically illustrates a radial cross-sectional view of a part of an electric motor with an electric motor device according to an embodiment of the present invention; and Fig. 6 schematically illustrates a cross-sectional view of means for retaining stator winding and short-circuit protection function including cooling means for cooling an electric motor according to an embodiment of the present invention.
    DESCRIPTION OF EMBODIMENTS Referring to Fig. 1, there is shown a platform P, wherein the platform P is included in a group comprising motor vehicles such as military vehicles, work vehicles, passenger cars, boats, helicopters or the like, a power station, any electrically powered machine or equivalent device including the single engine. for operation of the same. The platform P comprises at least one electric motor 1 comprising a device I for liquid cooling of the electric motor 1 according to the present invention.
    In an embodiment in which the electric motor 1 is included in a motor vehicle the sleeve motor 1 is configured for operation of said motor vehicle, which thus constitutes an electric motor vehicle. The device I for the electric motor can be designed in accordance with any of the embodiments described below.
    Fig. 2 schematically illustrates an axial cross-sectional view of an electric motor 1 with a single device I for liquid cooling of the electric motor according to an embodiment of the present invention.
    The electric motor 1 is of the inner rotor type comprising a rotor 10 and a stator 20 provided with a winding. The electric motor 1 of the inner rotor type means an electric motor 1 where the stator 20 is arranged to enclose the rotor 10. The outer surface of the rotor 10 is arranged adjacent and separated from the inner surface. 10 is according to a variant built up of rotor plates stacked on top of each other, not shown. With an extremely high-speed electric motor, for example an electric motor for gas turbine operation, the rotor is solid instead of built-up avrotor plates / laminated. The rotor 10 is arranged concentrically relative to the stator 20. In one embodiment, the center axis of the rotor 10 and the stator 20 coincides substantially with a center axis X of the electric motor 1. According to an alternative embodiment, the center axis of the rotor 10 and the stator 20 may be eccentrically arranged relative to the center axis of the electric motor 1.
    Said rotor 10 is intended to be connected to a drive shaft (not shown) and is thus arranged to rotate the drive shaft or to be rotated by the drive shaft. The rotor 10 has opposite end portions in the form of rotor ends 10a, 10b.
    The rotor ends 10a, 10b form end surfaces of the cylindrical rotor 10.
    The rotor 10 has a jacket surface 12 which faces the stator 20 and forms what is referred to herein as the outer surface of the rotor. The electric motor 1 further comprises a rotor shaft 14 which is coupled to the rotor 10 and projects axially from at least one rotor end 10a, 10b. The rotor shaft 14 is as a rule also cylindrical and concentrically arranged with the rotor 10 and the stator 20 so that its center axis coincides with the above-mentioned center axis X of the hose motor 1. The rotor shaft 14 may be a one-sided rotor shaft projecting from a single side of the electric motor 1. illustrated in Fig. 2, is a double-sided rotor shaft projecting from both sides of the electric motor 1.
    During operation of the electric motor 1, the rotor 10 and thus the rotor shaft 14 is caused to rotate, the rotor shaft 14 being arranged to transmit a driving torque outside the electric motor 1 to a drive device (not shown), for example for propelling an electrically driven motor vehicle. Alternatively, the electric motor can be driven by the vehicle, where the electric motor brakes by creating a negative torque, whereby the electric motor consequently acts as a generator.
    According to a variant, the stator 20 is built up of stator plates (not shown) stacked on top of one another. The stator 20 comprises a stator winding 22. According to a variant, the stator winding comprises a set of electrically conductive wires / conductors, preferably copper wires, through which a current is arranged to be conducted for driving the electric motor 1. Said conductors may be of different thicknesses. The said stator winding 22 is for the electric motor 1 of the inner rotor type arranged to run axially so that the winding is adjacent adjacent to the rotor 10. The stator winding 22 is arranged to project axially from end portions 20a, 20b of the stator 20, facing outside the end portions 20a, 20b and of the stator winding 22 forms a so-called here-turned 22b.
    The electrically conductive wires of the stator 20 are according to a variant arranged to run axially in spaces in the form of compartments or recesses of said stator plates, the different wire lengths being arranged to be led out from the end portions 20a, 20b of the stator 20 from a compartment or recess in the stator plates and back into another compartment or recess in the stator plates.
    The stator 20 of the electric motor 1 of the inner rotor type also has a shell surface 24a. The stator 20 then forms a cylindrical shell surrounding the rotor 10 so that the rotor shell surface 12a is completely enclosed by an inner surface or inner surface 24b of the stator 20 in the radial direction of the rotor 10. The outer surface as well as the mantle surface 12 of the rotor 10 is arranged adjacent and separated from said inner surface 24b of the stator 20, an air gap G being formed between the rotor 10 and the stator 20.
    According to the present invention, the stator winding 22 of the stator 20 is arranged to run along and axially project from and face outside the mantle surface of the stator 20.
    The electric motor 1 further comprises a motor housing 30 which encloses the components included in the electric motor 1, including the rotor 10 and the stator 20.
    Above, an electric motor 1 of the inner rotor type has been described. The present invention can advantageously also be used for an electric motor of external rotor type, where cooling takes place in the motor center, or an electric motor of axial flow type, where the cooling encloses the electric motor.
    Fig. 3 schematically illustrates a radial cross-sectional view of a part of an electric motor with a device I for electric motor according to an embodiment of the present invention. According to a variant, the electric motor is an electric motor in accordance with the average motor 1 illustrated in fig. 2.
    Fig. 3 illustrates a portion of the stator 120 of the electric motor. The stator 120 is provided with circumferential joints of the stator 122 distributed between the training spaces S or grooves S for the stator winding 22. Said goods portions 122 form so-called stator teeth. Said goods portions 122 have a first side 122a and an opposite second side 122b. The front side 122a of a freight portion and the second side 122b of an adjacent freight portion 122 accordingly delimit such a space S.
    Said goods portions 122 are arranged to support stator winding 22, means 130 being provided for holding the stator winding 22 in a thus formed space S in place and for offering a short-circuit protection function the first stator winding 22 in said space S. Said means 130 comprises cooling means 132 which are in a heat-conducting contact with back portion 125 of said stator 120 for cooling purposes.
    By means of cooling means 132 in thus heat-conducting contact with the back portion 125 of the hosstator, a heat-transporting barrier is formed which causes heat slippers to pass as many thermal barriers in the form of layers of insulation hosstator winding which reduces the temperature gradient in space S. Thus transporting heat is obtained more efficient cooling of the electric motor. 120 heat conducting portions of said means. The cooling means 132 has a first side. Said cooling means 132 comprises radially of the stator running 132a and an opposite second side 132a as well as end and 132c facing and heat-conducting abutment against the back portion 125.
    Said means 130 is formed by means of portions 132, 134 with a substantially T-shaped cross-section across the stator winding. Accordingly, the means 130 includes a retaining portion 134 with an extension transverse to the extension of the radially extending cooling member.
    According to this embodiment, the holding portion 134 and the cooling means 132 constitute a unit or a common piece. The means 130 comprises the cooling member 132 running radially from the substantially radially inwardly facing rear portion 125 of the space Shos stator 120, which in connection with the opening 0 facing the Smot rotor of the space passes into the holder portion 134.
    The holding portion 134 projects substantially circumferentially from the respective side of the cooling means 132 covering the opening. The holder portion 134 here has a side 134a facing the outer surface of the stator 120a outwards towards which the stator winding rests. The holder portion 134 hereby retains the stator winding 22 in the space S.
    The heat-conducting cooling means 132 is arranged to divide the space S so that stator winding 22 ends up on the respective sides 132a, 132b of the cooling means 132 offering short-circuit protection function and heat-conducting function.
    The stator winding 22 is here wound around each part of the goods 122 separately. The stator winding 22 can also be wound in another way such as around two or more parts of the goods 122. In Fig. 3 the stator winding 22 is wound around the middle part of the goods 122 and runs to the left of the goods part 122 inwards. and to the right of the goods portion outwards in the picture and turns in so-called here turns at end portions of the electric motor as illustrated in Fig. 2. Accordingly, the part of the stator winding divided by the cooling means 132 is to the right of the cooling part 132 in the left space S and the middle cooling part 132 the stator winding 22 to the left of the cooling means in the right-hand space S which constitutes the winding around the middle stage portion 122 of the stator. Thus, by winding the stator winding around 122 for the winding process, either with a preformed winding or by means of each goods portion / stator tooth itself, automation of a robot which winds the winding around one tooth at a time is facilitated.
    This enables both efficient retention of the stator winding in the space, short-circuit protection function and efficient cooling of the stator winding through heat transport.
    Fig. 4 schematically illustrates a radial cross-sectional view of a part of an electric motor with a device 11 for electric motor according to an embodiment of the present invention. According to a variant, the electric motor is an electric motor in accordance with the average motor 1 illustrated in fig. 2.
    The embodiment in Fig. 4 differs from the embodiment in Fig. 3 by the design of the means for holding the stator winding in place and for offering a short-circuit protection function for the stator winding in the spaces / grooves of the stator.
    Fig. 4 illustrates a part of the stator 220 of the electric motor. The stator 220 is provided with circumferential joints of the stator distributed goods portions 222 between it forming spaces S or grooves S for stator winding 22. Said goods portions 122 form so-called stator teeth. Said goods portions 222 have a first side 222a and an opposite second side 222b. Accordingly, the first side 222a of a portion of goods and the second side 222b of an adjacent portion of goods 222 define such a space S.
    Said goods portions 222 are arranged to support stator winding 22, means 230 being present for pouring stator winding 22 into a similarly formed space S in place and for providing a short-circuit protection function of the first stator winding 22 in said space S. Said means 230 comprises cooling means 232 which are in contact with a heater. back portion 225 of said stator 220 for cooling purposes. radially of the stator 220 heat conducting portions of said means. The cooling means 232 has a first side. The cooling means 232 comprises a running 232a and an opposite second side 232a. Said means 230 is formed by means of portions 232, 234 with a substantially T-shaped cross-section across the stator winding. Accordingly, the means 230 includes a retainer portion 234 having an extension transverse to the extension of the radially extending cooling member 232.
    According to this embodiment, said cooling means 232 radially includes stator back portions running radially from the stator ridge, the portions including said hopper portions 234 having a substantially T-shaped cross-section. Accordingly, the means 230 includes radiating portions 232 radially extending from the stator ridge which extend into the pouring portion 234 adjacent to the rotor opening opening of the space S. By thus constructing the stator ridge with portions having a T-shaped cross-section in the opening, effective retention of cooling is possible. the stator winding by heat transport by means of the stator back. Consequently, the entire function with short circuit, retention and heat transport / cooling is achieved with one and the same piece of the stator back.
    By means of cooling means 232 in such heat-conducting contact with the back portion by means of the cooling means by means of said radially of the back portion running portion of the stator 220, a heat-transporting barrier is formed which means that the heat does not pass equal thermal barriers in the form of layer stripping at the stator winding. By seldom transporting heat, a more efficient cooling of the electric motor is obtained.
    According to this embodiment, the pouring portion 234 and the cooling means 232 consist of a unit or a common piece in the form of a portion of the back portion of the housing stator, where the cooling means 232 in connection with the opening 0 facing the rotor S merges into the pouring portion 234.
    The pouring portion 234 projects substantially circumferentially from the respective side of the cooling means 232 covering the opening 0. The pouring portion 234 has a side 234a, 234b facing the outer surface 22 of the stator 220 facing each other, against which stator winding 22 rests. The holding portion 234 hereby retains the stator winding 22 in the space S.
    The heat-conducting cooling means 232 is arranged to divide the space S so that stator winding 22 ends up on the respective side 232a, 232b of the cooling means 232 offering short-circuit protection function and heat-conducting function.
    Fig. 5 schematically illustrates a radial cross-sectional view of a part of an electric motor with a device 11 for electric motor according to an embodiment of the present invention. According to a variant, the electric motor is an electric motor in accordance with the average motor 1 illustrated in fig. 2.
    The embodiment in Fig. 5 differs from the embodiment in Fig. 4 by the design of the means for holding the stator winding in place and for offering a short-circuit protection function for the stator winding in the spaces / grooves of the stator.
    Fig. 5 illustrates a part of the stator 320 of the electric motor. The stator 320 is provided with circumferential joints of the stator distributed goods portions 322 between it forming spaces S or grooves S for stator winding 22. Said goods portions 322 form so-called stator teeth. Said goods portions 322 have a first side 322a and an opposite second side 322b. The front side 322a of a freight portion and the second side 322b of an adjacent freight portion 322 consequently delimit such a space S.
    Said goods portions 322 are arranged to support stator winding 22, means 330 being provided for holding the stator winding 22 in a thus formed space S in place and for offering a short-circuit protection function the stator winding 22 in said space S. Said means 330 comprises cooling means 332 which are in contact with a heating means back portion 325 of said stator 320 for cooling purposes. 13 radially of the stator 320 heat conducting portions of said means 330. The cooling means 332 has a first said cooling means 332 including running side 332a and an opposite second side 332a.
    Said means 330 is formed by means of portions 332, 334 with a substantially T-shaped cross-section across the stator winding. Accordingly, the means 330 includes a retainer portion 334 having an extension transverse to the extension of the radially extending cooling member 332.
    According to this embodiment, said cooling means 332 radially includes stator back portions running radially from the stator ridge. Accordingly, the means 330 includes radiating portions 332 radially extending from the stator ridge forming the cooling means 332. The cooling means 332 has an end portion 332c facing the opening 0 and consequently from the mantle surface 324a of the stator 320.
    The pouring portion 334 projects substantially circumferentially from the respective side of the cooling means 332 covering the opening O. The pouring portion 334 here has a side 334a, 334b facing the mantle surface 324a of the stator 320 facing which stator winding 22 rests. The holder portion 334 hereby retains the stator winding 22 in the space S.
    According to this embodiment, the pouring portion 334 constitutes a separate unit with one end portion 334c facing and abutting against the end portion 332c of the cooling means 332.
    By means of cooling means 332 in such heat-conducting contact with the back portion by means of the cooling means by means of said radially of the back portion running portion of the stator 320, a heat-transporting barrier is formed which means that the heat does not pass as many thermal barriers in the form of layer stripping of stator winding. By seldom transporting heat, a more efficient cooling of the electric motor is obtained. The heat-conducting cooling means 332 is arranged to divide the space S so that stator winding 22 ends up on the respective side 332a, 332b of the cooling means 332 offering short-circuit protection function and heat-conducting function.
    Fig. 6 schematically illustrates a cross-sectional view of means 430 of device IV for retaining stator winding and short-circuit protection function including cooling means 432 for cooling electric motor according to an embodiment of the present invention.
    The means 430 substantially corresponds to the means 130 in Fig. 3. The means 430 consequently comprises a cooling means 430 intended to run radially in space / barrier of stator-shaped holder portion 434 for retaining stator winding. The cooling means 432 has a first side 432a and an opposite second side 432b where stator winding is intended to be present on each side by the cooling means dividing space of the stator. Cooling member 432 further has an end portion 432c for heat transfer abutting the portion of the stator back of the stator. The cooling means in the area opposite the end portion 432c of the cooling means 432 merges with the tilting portion 434. The pouring portion 434 has an end portion 434c intended to be facing the rotor. The pouring portion 434 projects substantially circumferentially from the respective side of the cooling member 432 so that the opening of space of the stator is covered. The pouring portion 334 here has a side 434a, 434b intended to face outwards towards the mantle surface of the stator against which stator winding is intended to rest.
    The means 430 differs from the means 130 by cooling channels C of the cooling means 432 of the means 430. According to this embodiment of the device, said cooling means 432 include axially running channels C for flow of cooling medium in the form of, for example, oil. This enables efficient cooling of medium coolant in the form of, for example, oil without the air gap at the side facing the rotor of the stator having to be sealed. According to a variant, the coolant is intended to be pumped into said channels C by means of a pump unit, not shown.
    According to this example, the cooling means 432 has four channels C. The cooling means 432 can have any suitable number of channels with any suitable design. The cooling means 432 has at least one channel.
    According to one embodiment, corresponding channels are arranged in one of the cooling means 132, 232, 234 of the embodiments in Figs. 3, 4, and 5.
    The above description of the preferred embodiments of the present invention has been provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the invention to the variations described herein. 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 (9)
    [1]
    An apparatus (|; ll; lll) for an electric motor (1) having a rotor (10) and a stator (20; 120; 220; 320), the stator being provided with circumferential portions of the stator-distributed goods portions (122; 222; 322) interconnecting spaces (S) first stator winding (22), said goods portions being arranged to support stator winding (22) and wherein means (130; 230; 330; 430) are present for pouring the stator winding into a space (S) thus formed in place and to offer a short-circuit protection function for the stator winding (22) in said space (S), characterized in that said means (130; 230; 330; 430) comprise cooling means (132; 232; 332; 432), which are in heat-conducting contact with a back portion ( 125; 225; 325) of said stator for cooling purposes.
    [2]
    The device of claim 1, wherein said cooling means (132; 232; 332; 432) includes radially of the stator heat conducting portions of said means.
    [3]
    The device of claim 1 or 2, wherein said means (130; 230; 330; 430) is formed by portions (134; 234; 334; 434) having a substantially T-shaped cross-section across the stator winding (22).
    [4]
    Device according to any one of claims 1-3, wherein said cooling means (232; 332) comprises stator back portions (232, 234; 332) running radially from the stator ridge (220; 320).
    [5]
    The device of claim 4, wherein said stator back portions (232, 234) extending radially from the stator back (220) include said portions (234) having a substantially T-shaped cross section.
    [6]
    Device according to claims 1-5, wherein said short-circuit protection function is arranged to be provided by portions (132; 232; 332; 432) of said means (130; 230; 330; 430) arranged to separate stator winding portions (22) in said space (S ). any of 17
    [7]
    A device according to any one of claims 1-6, wherein said cooling means (432) comprises axially extending channels (C) for flow of cooling medium.
    [8]
    Platform (P) comprising a device according to any one of claims 1-7.
    [9]
    A platform according to claim 8, comprising a vehicle.
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    同族专利:
    公开号 | 公开日
    EP3286821A1|2018-02-28|
    US20180115222A1|2018-04-26|
    EP3286821A4|2018-11-07|
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    法律状态:
    2019-12-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1550484A|SE540148C2|2015-04-23|2015-04-23|Unit comprising cooling means and holding means intended for placement between stator teeth|SE1550484A| SE540148C2|2015-04-23|2015-04-23|Unit comprising cooling means and holding means intended for placement between stator teeth|
    US15/567,572| US20180115222A1|2015-04-23|2016-04-07|Device for an electric motor|
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