Assembly for establishing electrical contact with a refrigerant compressor drive motor, refrigerant compressor drive motor, and method for establishing electrical contact with a motor

Abstract

To provide an assembly for establishing electrical contact with an electric motor for driving a compressor provided for compressing a gaseous fluid, in particular a refrigerant, in a refrigerant circuit of a vehicle air conditioning system.SOLUTION: An assembly for establishing electrical contact with an electric motor for driving a compressor includes an electrical conductor element for the axial electrical connection of an axial electrical connection conductor of a stator coil lead protruding from the stator of the motor onto the axial end face and a stator coil lead protruding from the motor stator onto the axial end face, and an annular carrier element formed by injection molding.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an assembly for establishing electrical contact with an electric motor for driving a compressor provided for compressing a gaseous fluid, in particular a refrigerant, in a refrigerant circuit of a vehicle air conditioning system. The invention further relates to an electric motor provided with such an assembly for establishing electrical contact, and to a method for assembling an assembly for establishing electrical contact with an electric motor of a compressor as part of a vehicle air conditioning system for temperature control of the vehicle.

[0002] An electrically driven compressor used in a vehicle air conditioning system for controlling the vehicle temperature includes an electric motor for driving each compression mechanism and an inverter for driving the electric motor. The inverter is used to convert direct current (DC) from the vehicle battery into alternating current (AC) and supply it to the electric motor via an electrical connection. The electric motor of an electrically driven compressor is typically formed with an annular stator core on which a coil is arranged and a rotor, the rotor being disposed inside the stator core. In this case, the rotor and stator are oriented on a common axis of symmetry or rotation of the rotor. The inverter, which is provided for supplying AC current, has a plug connection for a plug connector formed as a separate component and pins for electrically connecting or establishing electrical contact with the connection portions of the electric motor, the pins being electrically connected to connection conductors of the lead wires of the stator coil. The electrical contacts of the electric motor are typically disposed on the end faces of the stator oriented in the axial direction of the stator. In this case, these electrical connections or contacts can be formed within the connector housing. During assembly of the compressor, the inverter's plug connectors, formed as pins, are inserted into connection ports in the connector housing and can be brought into contact with the corresponding lead wires, particularly the connecting leads, of the stator coils. In this case, the ends of these lead wires are electrically and mechanically connected to the connecting leads so as to ensure low contact resistance between the inverter's plug connector and the lead wires in each case. For example, to simultaneously ensure high insulation resistance and electrical connection between the connecting conductors of the lead wires, the uninsulated ends of the connecting conductors (also called phase conductors) of the lead wires coming out of the coils must be electrically insulated from each other and from other electrically conductive components of the stator, particularly the motor housing. Such conductors are preferably hermetically sealed.

[0003] A corresponding device with an assembly for establishing electrical contact between an electric motor and an inverter is known from the applicant's German Federal Republic Application No. 10 2019 107 523.8. To establish electrical contact between the stator leads emerging from the coil and the motor's inverter, the assembly described in the above document includes a plug housing and a plug receptacle, which must first be plugged together during assembly. Furthermore, the ends or leads of the phase conductors must be placed and assembled into the plug housing before all exposed electrical conductors are electrically insulated from each other with a potting material. The assembly of this assembly for establishing electrical contact is relatively time-consuming, as the individual components must be assembled manually or mechanically. The large number of assembly steps increases the likelihood of errors. Furthermore, in the known solution, the plug receptacle is located on the end face of the stator, which requires a relatively long time to connect the phase conductors between the coil and the plug receptacle, leading to increased material costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Federal Republic of Germany Application No. 10 2019 107 523.8 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to overcome the drawbacks of the prior art and to propose an assembly for establishing electrical contact with an electric motor for driving a compressor provided for compressing a gaseous fluid, in particular a refrigerant, in a refrigerant circuit of a vehicle air conditioning system. The assembly for establishing electrical contact should also have as few components and parts as possible to enable as simple an assembly as possible and to reduce weight and required space. In this case, all connection conductors of the lead wires, in particular the ends of the connection conductors of the lead wires arranged within the assembly for establishing electrical contact, should be hermetically sealed from each other and from surrounding conductive components. A further object is to propose an electric motor equipped with such an assembly for establishing electrical contact, and a method for assembling the assembly for establishing electrical contact to the electric motor. This object is achieved by an assembly having the features of claim 1, a method for manufacturing the assembly according to the features of claim 12, an electric motor having the features of claim 14, and a method for assembling the assembly according to the features of claim 16. Advantageous configurations or embodiment variants are specified in the respective dependent claims. [Means for solving the problem]

[0006] According to the concept of the present invention, there is provided an assembly for establishing electrical contact with an electric motor for driving a compressor formed in a motor vehicle air conditioning system for compressing a gaseous fluid, in particular a refrigerant, which assembly is used on the one hand to establish electrical contact with the electric motor and on the other hand forms an interface for connecting with an electric inverter for driving the electric motor.

[0007] An assembly according to the present invention for establishing electrical contact with an electric motor of a compressor in a vehicle air conditioning system includes first and second electrical conductor elements for electrically connecting electrical connection conductors of coil leads axially protruding from the stator of the electric motor at its axial end surface. These electrical connection conductors of the coil leads protruding from the axial end surface may also be referred to as axially protruding connection conductors or axial connection conductors. The term "connection conductors" also includes the wire ends of the coil leads axially protruding from the stator at its axial end surface for establishing electrical contact. The assembly also includes an annular carrier element formed by injection molding, in which the electrical conductor elements are integrally formed and overmolded with the material of the annular carrier element. In this case, the first electrical connection elements of the electrical conductor elements protruding radially from the annular carrier element are formed to establish electrical contact with the electrical connection conductors of the stator leads axially protruding from the end surface, the first electrical conductor element being formed as an electrical bus bar, and the plurality of second electrical conductors have second electrical connection elements in the form of conductive sockets that are electrically isolated from each other. These conductive sockets, open on one side for receiving pin-shaped plug elements, are integrated into the annular carrier element and overmolded at their outer periphery with the material of the annular carrier element. The first electrical conductor element is formed as an electrical busbar, with a plurality of first electrical connection elements electrically connected to the first electrical conductor element, while the second electrical conductor element forms an electrical connection between the first and second electrical connection elements of the second electrical conductor element to establish an electrical connection between the conductive wires of the stator coils and the inverter for driving the electric motor when the pin-shaped plug elements of the electric inverter are plugged into the conductive socket. The first electrical connection elements of the conductor elements are arranged radially outward, and therefore can also be called radial connection elements of the conductor elements. According to the present invention, the annular carrier element has at least two, preferably three, axial spacer elements on its side facing the stator, which rest on the axial end faces of the stator when the assembly is placed on the stator, and the spacer elements are dimensioned so that an air gap is formed between the lower surface of the carrier element and the axial end face of the stator.This air gap also exists between the underside of the carrier element and the coil and insulator elements of the stator. The spacer elements create a gap between the underside of the assembly and the stator, preventing the annular carrier element from being tightly seated on the stator or stator components. The spacer elements are dimensioned to provide a distance or clearance, particularly an air gap, between the annular carrier element and components located radially inside the stator, such as coils and their insulating overmoldings, and insulator elements such as stator teeth. The annular carrier element is supported by the spacer elements on the axial end face of the stator, so that the underside of the annular carrier element does not come into contact with the axial end face of the stator opposite the underside. The spacer elements can contact the radially outer side of the stator.

[0008] Since a three-phase alternating current is usually supplied by an inverter for driving the electric motor, according to a preferred embodiment the annular carrier element also has three conductive sockets and three second electrical conductor elements each having a radial first electrical connection element protruding radially from the annular carrier element for establishing electrical contact with the connection conductors of the coil leads of the stator of the electric motor.

[0009] The components according to the present invention simplify the assembly process, since fewer individual components must be combined with one another. The reduced complexity of the components in the assembly according to the present invention reduces the risk of error sources compared to the prior art. Furthermore, assembly on the stator is simplified, since the electrical connection or electrical contact is established directly where the lead wire connection conductors exit the stator coils in the axial direction of the stator. Since the electrical conductor elements integrated in the annular carrier element are already electrically insulated by the overmolding material of the annular carrier element, no additional core insulating sleeve or long wiring path from the lead wire connection conductors to the connection area of ​​the conductive socket is required to establish electrical contact with the electrical inverter.

[0010] Regarding the arrangement of the electrical connection elements of the electrical conductor elements of the annular conductor element, various design concepts for the stator or motor can be implemented. The position of the first electrical connection element of the electrical conductor elements of the annular carrier element can be predetermined, for example. The specific positioning of the first electrical connection element simplifies the assembly for establishing electrical contact with the electric motor. Furthermore, the arrangement of the first electrical connection element of the electrical conductor elements of the annular carrier element allows direct electrical contact with the connection conductors of the coils protruding axially from the stator, advantageously shortening the path of the electrical connection conductors of the coil leads.

[0011] The annular carrier element is preferably formed by a radial annular surface and an axial annular surface, which are joined at their outer side edges in a generally tangential relationship. The radial ring surface of the annular carrier element is advantageously annular, in particular partially annular or open annular, and can be partially interrupted by cavities or recesses, while the axial ring surface of the annular carrier element is annular-cylindrical, and can also be interrupted by cavities or recesses. Thus, the annular carrier element can have cavities in the form of radial cavities, axial cavities or recesses, and the first radial electrical connection elements are arranged radially outward in the cavities and / or recesses.

[0012] In the region of the annular carrier element where the cavities in the form of radial cavities, axial cavities, and / or recesses are formed, guides or feedthroughs in the form of radial cutouts and / or axial openings can be formed for the axial electrical connection conductors of the coil leads. The radial cutouts and / or axial openings for guiding or passing the electrical connection conductors of the leads axially projecting from the end face of the stator and the radial first electrical connection elements projecting radially from the annular carrier element are preferably designed to correspond to each other. In other words, the positions of the radial cutouts and / or axial openings are oriented radially and axially relative to the positions of the radial first electrical connection elements of the electrical conductor elements, thereby enabling the axial guidance or feeding of the axial electrical connection conductors of the leads axially projecting from the end face of the stator. This ensures that the axial electrical connection conductors of the leads directly match the electrical connection elements of the electrical conductor elements during assembly.

[0013] The cavities or recesses that can be formed in the radial annular surface and / or the axial annular surface of the annular carrier element serve as spaces for receiving potting material for establishing a hermetic seal and electrical insulation between the radial first electrical connection elements and the axial electrical connection conductors disposed in the cavities or recesses when connected with the radial first electrical connection elements in an assembled state.

[0014] According to one configuration of the assembly, the axial cavities can be formed in an axial ring surface formed on the annular carrier element on the axial end face of the annular carrier element facing away from the stator, and the axial cavities can be axially limited by the axially formed underside of the annular carrier element facing the stator, with the radial first electrical connection elements of the first electrical conductor elements being arranged in the first axial cavity and the radial first electrical connection elements of the second electrical conductor elements being arranged in the second axial cavity. In this case, radial notches and / or axial openings for guiding or passing the axial electrical connection conductors of the lead wires are formed in the underside of the annular carrier element so that the axial electrical connection conductors of the lead wires can be introduced into the axial cavities from the underside of the annular carrier element. The axial cavities are preferably formed within the radial annular portions. Thus, each axial cavity is formed as a partial area of ​​the axial annular surface of the annular carrier element and is bounded by the underside of the annular carrier element and the radially inner and outer sides of the annular carrier element.

[0015] According to a further configuration of the assembly, the cavity can be formed as a radial cavity on the annular surface of the annular carrier element facing radially outward, the radial cavity being axially bounded by the lower side of the annular carrier element, which is formed axially and faces the stator, and the upper side of the annular carrier element. Thus, the radial cavity is radially open for filling with potting material. In this case, the radial first electrical connection element of the first electrical conductor element is disposed in the first radial cavity, and the radial first electrical connection element of the second electrical conductor element is disposed in the second radial cavity. In this configuration, radial notches and / or axial openings, which serve to guide or pass through the electrical connection conductors of the lead wires protruding axially from the end face of the stator, are also formed in the lower surface of the annular carrier element. The radial cavity is preferably formed within the radial annulus. The radial cavities are thus formed along the radial circumference of the annular carrier element as partial regions of the radial annular surface of the carrier element in each case, such that the radially outwardly directed annular surface is interrupted. The first electrical connection elements of the conductor elements are preferably arranged in the cavities so that they do not protrude beyond the radially outer circumference of the annular carrier element.

[0016] The shape and dimensions of the recess in which the radial first electrical connection element of the conductor element is disposed can be predetermined by the injection mold used to manufacture the annular carrier element, similar to the radial or axial cavity. In this case, the recess is designed to be bounded by the material of the annular carrier element's lower surface facing the stator and the radially inner periphery. Even in this configuration, the first electrical connection element is disposed in the recess facing radially outward. A first recess can be provided for the radial first electrical connection element of the first electrical conductor element, and the radial first electrical connection element of the second electrical conductor element can be disposed in a second recess. The recesses can be offset by a predetermined angle. To bound the recess of the annular carrier element on the radial periphery, the assembly can include a stop ring disposed on the radial periphery of the annular carrier element. The stop ring defines the recess radially outward so that it opens only toward the axially upper side of the annular carrier element. The recess can be filled with a potting material from the upper side of the annular carrier element. In this case, the stop ring has a latch element for fixing its position on the annular carrier element. Additionally, the stop ring can have a thread for screwing onto the annular carrier element, and a locking element is locked at the end of the thread to fix the stop ring in place.

[0017] The stop ring may have a radially inwardly facing shutter that corresponds to a guide or feedthrough formed as a radial notch and / or axial opening for the axial connecting conductor of the lead wire so that the radial notch and / or axial opening can be covered at least in area when the stop ring is positioned on the annular carrier element. The shutter reduces the opening cross-section of the radial notch and / or axial opening so that the risk of the potting material escaping through the radial notch and / or axial opening is reduced when the recess is filled with potting material.

[0018] The radial first electrical connection element of the electrical conductor element can have an open or closed eyelet for receiving the electrical connection conductor of the lead wire. Advantageously, when the assembly is assembled on the stator, the axial electrical connection conductor of the lead wire is guided from the radial cutout and / or the axial opening directly into the eyelet of the radial first electrical connection element, thereby ensuring a particularly simple assembly and electrical connection of the axial electrical connection conductor of the lead wire, and thereby reducing the number of assembly steps.

[0019] To further stabilize the guidance of the axial electrical connection conductors and the axial electrical lead ends of the stator coil leads, guide elements can be disposed in recesses formed radially outward from the radially recessed recess wall, with the radial first electrical connection elements protruding from the recesses. A guide element is associated with each radial first electrical connection element, and the guide elements are disposed obliquely relative to the radial first electrical connection elements. In this case, each guide element has an inclined surface facing the radial cutout. The guide elements are provided to axially support the axial electrical connection conductors inserted through the radial cutouts and the axial electrical lead ends of the stator coil leads, ensuring their receipt in the half-open eyelets of the radial first electrical connection elements.

[0020] According to a further advantageous configuration of the assembly according to the invention, it may be provided that the annular carrier element is formed with a radially inwardly extending radial protrusion, which receives the second electrical connection element of the second electrical conductor element in the form of a conductive socket overmolded on the outer periphery, the conductive socket extending axially from the radial protrusion on an upper side facing away from the stator. The arrangement of the conductive socket overmolded on the outer periphery is preferably formed so that it protrudes perpendicularly from the axial end face of the annular carrier element to enable the connection of a plug element of the electrical inverter. As a result, the conductive socket overmolded on the outer periphery can form a plug receptacle for the plug element of the electrical inverter. This plug receptacle can be formed axially on an upper side of the annular carrier element facing away from the stator.

[0021] The protrusions extending radially inward of the annular carrier element are substantially formed from an overmolding of the second electrical conductor element and the second electrical connection element to electrically insulate the second electrical conductor element and to provide electrical contacts of the inverter plug element radially inward from the outer periphery of the annular carrier element for efficient space utilization.

[0022] The conductive sockets overmolded onto the outer periphery, which are the configurations of the second electrical connection elements of the second electrical conductor element, can be equally spaced on a secant that intersects the annular carrier element. The conductive sockets penetrate the radially inwardly extending protrusions, which means that the conductive sockets overmolded onto the outer periphery are equally spaced on a common line on the radially inwardly extending protrusions. As a result, the second electrical conductor elements integrated into the annular carrier element can have different lengths when the radially extending first electrical connection elements of the second electrical conductor element protrude radially in the radial arc of the annular carrier element.

[0023] The axially protruding support elements can be formed from the material of the annular carrier element on the underside of the annular carrier element facing the stator in the region of the radial protrusions. In each case, one carrier element can be associated with a conductive socket overmolded on its outer periphery, with the support elements formed axially below the overmolded conductive socket in the direction of the stator. The support elements are provided to support the radial protrusions of the annular carrier element when an axial compressive load acts on the stator, particularly on the stator core, and are dimensioned to maintain a predetermined expansion distance between the support elements and the stator. The support elements are provided to avoid axial overstretching when an axial compressive force acts on the radially inward protrusions during assembly of the plug connector of the electrical inverter. The expansion distance is advantageously dimensioned to leave a sufficiently large gap between the underside of the support elements and the stator to avoid contact between the support elements and the stator during operation of the electric motor. The dimensions of the support element are therefore selected so as to ensure support to protect against axial over-expansion and so as to leave an expansion distance in the form of a gap when no axial compressive forces act on the annular carrier element, in particular on the radially inward protrusions of the annular carrier element, thus fulfilling its function when the plug connector is assembled, with axial compressive forces acting in the region of the radial protrusions.

[0024] The annular carrier element may be made from a plastic, in particular a polyamide 66 (PA66) material.

[0025] The present invention also includes a method for manufacturing an assembly for establishing electrical contact with an electric motor for driving a compressor formed in an automotive air conditioning system for compressing a gaseous fluid. In this method, first and a plurality of second conductor elements, preferably exactly three second conductor elements, and a conductive socket are placed in an injection mold defining the shape of an annular carrier element, and then a plastic material (preferably PA66) is injected into the injection mold. The injected material is molded on the injection mold, whereby the electrical conductor elements, i.e., the first and second electrical conductor elements, are overmolded with the plastic material so that the radially outer first electrical connection element of the electrical conductor elements, which is radially outside the annular carrier element, remains free from the overmolding, and the electrical conductor socket is overmolded only on the outer periphery so that the plug opening remains free.

[0026] According to this method, the second electrical conductor element can have a plug receptacle for the conductive socket, and the conductive socket can be inserted into the plug receptacle of the electrical conductor element before being placed in the injection mold. Therefore, the second electrical conductor element and the conductive socket can be formed in two parts. Furthermore, the conductive socket can be injection-molded from PA66 plastic and incorporated into the annular carrier element by overmolding the electrical conductor element inserted into the injection mold before being combined with the plug receptacle of the electrical conductor element.

[0027] The object of the present invention is also achieved by an electric motor for driving a compressor formed in an automotive air conditioning system to compress a gaseous fluid. The electric motor according to the present invention has a rotor and a stator arranged to extend along a common longitudinal axis. Another component of the electric motor according to the present invention is an assembly for establishing electrical contact with the electric motor according to any one of the above-mentioned configurations. The assembly for establishing electrical contact with the electric motor is arranged on the axial end face of the stator, the stator having electrical connection conductors formed as sections of electrical leads of the coils, these electrical connection conductors being in direct contact with radial first electrical connection elements of electrical conductor elements on the axial end face of the stator protruding axially from the stator, in each case, such that the axial electrical connection leads correspond to the first radial electrical connection elements, and the axial electrical connection conductors of the leads with the electrically contacted radial first electrical connection elements are surrounded by a hermetically sealing potting material. In this case, the potting material is preferably introduced only into the cavities or recesses of the annular carrier element. According to the invention, the annular carrier element has at least two, preferably three, axial spacer elements on its side facing the stator, the axial spacer elements resting on the axial end faces of the stator, the spacer elements being dimensioned so that an air gap is formed between the lower surface of the carrier element and the axial end faces of the stator, and also between the lower surface of the carrier element and the coils and insulator elements of the stator.

[0028] It is particularly preferred for the electric motor according to the invention to have an arrangement in which the radial first connection elements of the electrical conductor elements projecting radially from the annular carrier element correspond to the arrangement of the radial cutouts and / or axial openings formed in the underside of the annular carrier element for guiding or passing the electrical connection conductors of the leads and to the arrangement of the axial electrical connection conductors projecting axially from the end face of the stator, with the advantage that particularly short electrical line paths can be maintained for the electrical connection between the stator coil leads and the radial first electrical connection elements projecting radially from the annular carrier element, since the axial connection conductors of the stator coil leads projecting axially from the end face of the stator are in direct electrical contact with the radial first electrical connection elements of the electrical conductor elements of the annular carrier.

[0029] According to this configuration, the annular carrier element of the assembly for establishing electrical contact with the electric motor can have at least two, preferably three, axial spacer elements on the side facing the stator, which rest against the outer periphery of the stator and on the axial end faces of the stator, maintaining a distance between the underside of the annular carrier element and the stator, in particular the insulator elements of the stator coils.

[0030] The axial orientation of the circumferentially overmolded conductive socket has proven advantageous for receiving pin-shaped plug elements of an electrical inverter.

[0031] This object is further achieved by a method for assembling an assembly for establishing electrical contact with an electric motor for driving a compressor formed in a vehicle air conditioning system for compressing a gaseous fluid, the method comprising the steps of: - orienting electrical connection conductors of coil leads protruding from a stator of the electric motor in the axial direction on an axial end face of the stator; - disposing the annular carrier element on the axial end face of the stator, and the axial electrical connection conductors are guided along the radial notches formed in the annular carrier element or fed through the axial openings formed in the annular carrier element so that the electrical connection conductors of the lead wires of the stator coils contact the radial first electrical connection elements of the electrical conductor elements protruding radially from the annular carrier element; - connecting the axial electrical connection conductor to the radial first electrical connection element; - introducing a potting material so as to hermetically seal the axial electrical connection conductor and the radial first electrical connection element that is in electrical contact with and electrically connected to the axial electrical connection conductor;

[0032] Due to the configuration of the assembly for establishing electrical contact, the axial electrical connection conductors of the stator lead wires are guided perpendicular to the radial first electrical connection elements that protrude radially from the annular carrier element when the assembly is assembled. In a three-phase stator, the three connection conductors of the lead wires and their respective connection ends protrude axially from the stator. During electrical contact establishment, the axially oriented lead ends of the lead wires are connected to the radial first electrical connection elements of the first electrical conductor element formed as a busbar, and electrical contact is established between the axial connection conductors of the lead wires and the radial first electrical connection elements of the second conductor element. The corresponding arrangement of the axial electrical connection conductors and the radial first connection elements allows for particularly simple assembly with low error potential.

[0033] The axial electrical connection conductor can be connected to the radial first electrical connection element by, for example, bonding, in particular welding and / or soldering, to provide a firmly joined connection. However, it is also possible to mechanically connect the axial electrical connection conductor and the radial first electrical connection element by threading the axial electrical connection conductor through an eyelet in the radial first electrical connection conductor and bending it to ensure a permanent connection. The electrical connection is fixed by introducing a potting material.

[0034] The electric motor according to the present invention is provided for driving a compressor for compressing a gaseous fluid for a refrigerant compressor in a refrigerant circuit of a vehicle air conditioning system. In summary, the present invention also has the following advantages: - The electrically active connection parts are completely hermetically sealed using only the potting material without any additional sealing elements, and the electric wires, especially the connecting conductors, are fixed without the need for additional fasteners. - Very good electrical insulation, optimum length of the connecting conductor of the lead wire, minimum cost and weight achieved; - the complete sealing of the electrical connection elements, in particular the electrical conductor elements integrated in the annular carrier element and overmolded by the material of the annular carrier element, prevents the infiltration of fluids flowing inside the compressor and avoids the occurrence of short-circuit currents between the connection elements, i.e. between the radial first electrical connection elements and the axial electrical connection conductors, as well as between other conductive, active and inactive components; In particular, the clear structural design of the annular carrier element allows for easy assembly due to the clear positioning of the annular carrier element and the electrical connection ports, i.e. the first and second electrical connection elements. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a perspective view of an exemplary embodiment of components of an assembly for establishing electrical contact with a compressor-drive motor; [Figure 2] 2 shows the components of the assembly shown in FIG. 1 for establishing electrical contact with the compressor motor, the components of the assembly being partially transparent. [Figure 3] 1 is a schematic diagram of an exemplary embodiment of a conductor element. [Figure 4] 1 is a perspective view of an exemplary embodiment of a stop ring of an assembly according to the present invention; [Figure 5] 1 is a schematic diagram of an assembly according to the present invention; [Figure 6] 6(a) is a schematic view showing the configuration of the assembly according to the present invention shown in FIG. 5 as seen from below, and FIG. 6(b) is a detailed cross-sectional view of the configuration of the assembly according to the present invention shown in FIG. 5(a). [Figure 7a] 1 is a perspective view of a stator of an electric motor according to the present invention; [Figure 7b] 7b shows the stator of the motor of FIG. 7a with a stop ring. [Figure 7c] 7b shows the stator shown in FIG. 7b with a stop ring and an assembly according to the present invention attached thereto. [Figure 7d] 1 is a perspective view of the stop ring of an assembly according to the present invention, with the stop ring separated. [Figure 8a] 7c shows a view similar to FIG. 7c of the stator of an electric motor according to the invention, with an assembly according to the invention for establishing electrical contact with the electric motor; [Figure 8b] 8a shows a different perspective view of the stator of an electric motor according to the invention with an assembly according to the invention as in FIG. 8a; [Figure 8c] 8b is a detailed cross-section showing in more perspective the configuration of the stator of the electric motor according to the invention shown in FIG. 8b, using an assembly according to the invention. [Figure 8d] 7d shows a stop ring of an assembly according to the invention in a different perspective view similar to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0036] Further details, features and advantages of the inventive arrangements can be gleaned from the following description of exemplary embodiments with reference to the associated drawings. FIG. 1 shows, in perspective, a schematic diagram of an exemplary embodiment of the components of an assembly for establishing electrical contact with an electric motor for driving a compressor. FIG. 1 illustrates an injection-molded annular carrier element 2 made of PA66, which is placed on the stator 17 of an electric motor, as shown in FIG. 7a or FIG. 8a-8c. The annular carrier element 2 has a radial ring surface 2.1 and an axial ring surface 2.2, which are connected to each other approximately parallel at their outer side edges. The radial ring surface 2.1 of the annular carrier element 2 has the shape of a circular ring, and the axial ring surface 2.2 of the annular carrier element 2 has the shape of a circular ring cylinder. The radial ring surface 2.1 and the axial ring surface 2.2 are interrupted by recesses 3.1 and 3.2 formed in the outer periphery of the annular carrier element 2. The recess 3.1 formed as a first recess and the recess 3.2 formed as a second recess offset from the first recess 3.1 by a certain angle are delimited radially inward by the material of the annular carrier element 2 on the underside 2.3 of the annular carrier element 2 facing the stator 17. The shapes of the recesses 3.1 and 3.2 project radially inward beyond the radially inner circumference 2.4 of the annular carrier element 2.

[0037] Furthermore, the annular carrier element 2 integrates a first electrical conductor element 4 (see FIGS. 2 and 3d) formed as an electrical busbar and three second electrical conductor elements 5 (see FIGS. 2, 3b and 3c) that are overmolded with the material of the annular carrier element 2. By overmolding with the material of the annular carrier element 2, the electrical conductor elements 4 and 5 are covered by the annular carrier element 2 shown in FIG. 1. The arrangement of the conductor elements 4 and 5 within the annular carrier element 2 can be seen in FIG. 2, which shows the annular carrier element 2 in semi-transparent form. The first conductor element 4 formed as a busbar is associated with the first recess 3.1 and has three radial first electrical connection elements 4.1, 4.2 and 4.3 that protrude radially outward into the first recess 3.1 without protruding beyond the outer periphery of the annular carrier element 2. The radial first electrical connection elements 4.1, 4.2, 4.3 of the first electrical conductor element 4 are used to establish electrical contact with the axial electrical connection conductors 21 of the leads from the coils 18 of the stator 17 (see FIG. 7a) protruding from the stator 17 at its axial end face 19. The three second electrical conductor elements 5 are electrically insulated from one another and associated with the second recess 3.2, each having a radial first electrical connection element 5.1 and an axial second electrical connection element 5.2. The radial first electrical connection elements 5.1 of the second electrical conductor elements 5 are formed so as to protrude radially outward into the second recess 3.2 without protruding beyond the outer periphery of the annular carrier element 2. The radial first electrical connection element 5.1 of the second electrical conductor element 5 is used to establish electrical contact with the axial electrical connection conductor 20 (see FIG. 7a) of the lead wire of the coil 18 of the stator 17 protruding from the axial end face 19 of the stator 17.

[0038] The underside 2.3 of the annular carrier element 2 facing the stator 17 has radial cutouts 9 in the region of the recesses 3.1 and 3.2, which serve to guide and position the axial connection conductors 20 and 21 of the leads of the coils 18 of the stator 17, which protrude axially from the end face 19, with which electrical contact is to be established. The positions of the radial cutouts 9 on the circumference of the annular carrier element 2 correspond axially to the radial first connection elements 4.1, 4.2, 4.3 of the first conductor element 4 and the radial first connection element 5.1 of the second conductor element 5. In this case, the radial first electrical connection elements 4.1, 4.2, 4.3, and 5.1 each have a half-open eyelet 10 for receiving the axial connection conductors 20 of the leads of the coils 18 of the stator 17, the half-open eyelet 10 being oriented radially towards the radial cutouts 9. The radial cuts 9 and the half-open eyelets 10 are thus oriented radially and axially relative to one another, so that the axial electrical connection conductors 20 and 21 of the leads of the coils 18 of the stator 17, which are led from the underside 2.3 through the radial cuts 9 into the recesses 3.1 and 3.2, are directly connected to the respective associated radial first electrical connection elements 4.1, 4.2, 4.3, 5.1.

[0039] To further stabilize the guidance of the axial electrical connection conductors 20 and 21 of the leads of the coils 18 of the stator 17, guide elements 11 are arranged in the radial recesses 3.1 and 3.2, protruding from the recess walls, from which radial first electrical connection elements 4.1, 4.2, 4.3, and 5.1 protrude radially outward. Each of the radial first electrical connection elements 4.1, 4.2, 4.3, and 5.1 is associated with a guide element 11, which is arranged obliquely relative to the radial first electrical connection elements 4.1, 4.2, 4.3, and 5.1. In this case, each guide element 11 has an inclined surface facing the radial cutout 9. The guide elements 11 are provided to axially support the axial electrical connection conductors 20 introduced through the radial cutouts 9 and the axial electrical connection conductors 21 of the leads of the coils 18 of the stator 17 and ensure that they are received in the half-open eyelets 10 of the radial first electrical connection elements 4.1, 4.2, 4.3 and 5.1.

[0040] A second electrical conductor element 5, overmolded with the material of the annular carrier element 2, extends radially inward from the exposed radial first electrical connection element 5.1, and the overmolding of the second electrical conductor element 5 forms a radial protrusion 6 extending radially inward. An axial second electrical connection element 5.2 in the form of a conductive socket 7 (see FIG. 3a), open on one side and overmolded on its periphery with the material of the annular carrier element 2, extends axially away from the radial protrusion 6 and away from the stator. The outer periphery overmolding of the conductive socket 7 forms a cylindrical plug receptacle 8 for inserting pin-type plug elements of an electrical inverter. Three cylindrical plug receptacles 8 are arranged side by side at equal intervals. As a result, the central second electrical conductor element 5 is formed radially longer than the two outer second electrical conductor elements 5.

[0041] On the radial periphery of the annular carrier element 2, three spacer elements 12 extend axially facing the stator 17. The spacer elements 12 are provided to ensure a distance between the underside 2.3 of the annular carrier element 2 and the stator 17, in particular the coils 18 of the stator 17 or the coil overmold. There is also an air gap between the teeth of the stator and the annular carrier element 2.

[0042] FIG. 2 shows the annular carrier element 2 shown in FIG. 1 of the assembly 1 (see FIG. 5) for establishing electrical contact with the electric motor of a compressor. The annular carrier element 2 is shown partially transparent. The arrangement of the first electrical conductor elements 4 formed as busbars is visible. Radial first electrical connection elements 4.1, 4.2, 4.3 project radially outward from the annular carrier element 2 in the region of the first recess 3.1. The arrangement of the second electrical conductor elements 5 is also shown. Radial first electrical connection element 5.1 projects radially outward from the annular carrier element 2 in the region of the second recess 3.2. The second electrical conductor element 5 extends radially inward within a radial projection 6. The second electrical connection element 5.2 is formed with a conductive socket 7 that is inserted perpendicularly into the second electrical conductor element 5, is overmolded with the material of the annular carrier element 2, and projects beyond the axial ring surface 2.2. In this case, the conductive socket 7 is open at the top to allow the insertion of pin-shaped plug elements of an electrical inverter.

[0043] 3a to 3d are schematic illustrations of exemplary embodiments of the electrical conductor elements 4 and 5 of the assembly 1 according to the invention without overmolding. To manufacture the annular carrier element 2, the electrical conductor elements 4 and 5 are placed in an injection mold that defines the shape of the annular carrier element 2. The injection mold is then filled with a plastic material and the electrical conductor elements 4 and 5 are overmolded with the plastic material.

[0044] Figure 3a shows an exemplary embodiment of the conductive socket 7 in a perspective view. The socket 7 can be formed as a single piece and can be connected to the second conductor element 5 during the manufacture of the annular carrier element 2. As can be seen in Figures 3b and 3c, the second conductor element 5 has a plug receptacle 13 into which the conductive socket 7 is inserted to complete the electrical contact before the conductive part formed from the conductive socket 7 and the second conductor element 5 is placed in an injection mold.

[0045] Figure 3b shows a schematic diagram of an exemplary embodiment of a central second conductor element 5, which is longer than the second conductor element 5 shown in Figure 3c and is one of the two outer second conductor elements 5. The different lengths of the second electrical conductor elements 5 allow the conductive sockets 7 to be arranged in a row, i.e. along a direction transverse to the annular carrier element 2, while the radial first electrical connection elements 5.1, which protrude radially from the material of the annular carrier element 2, are arranged along a circular ring portion within the second recess 3.2.

[0046] 3d shows in perspective view an exemplary embodiment of a first electrical conductor element 4 in the form of an electrical busbar. The first electrical conductor element 4 has a radius, and the radial first electrical connection elements 4.1, 4.2 and 4.3 are equally spaced along the busbar, which is formed as a circular ring section.

[0047] 4 shows a schematic diagram of an exemplary embodiment of a stop ring 14, which can be arranged on the radially outer circumference of the annular carrier element 2 on the radial ring surface 2.1 to define the radially outer radial ring surface 2.1 in the region of the recesses 3.1 and 3.2 where the radial ring surface 2.1 is interrupted. Its inner circumferential surface is provided with radially inwardly directed shutters 15, which correspond to the radial recesses 9 on the annular carrier element 2 when the stop ring 14 is arranged on the circumference of the annular carrier element 2. The stop ring 14 is rotatable together with the annular carrier element 2, so that the position of the radially inwardly directed shutters 15 can be adjusted relative to the radial recesses 9 to achieve coverage of the radial recesses 9. The radially inwardly directed shutters 15 are provided to minimize the opening cross-section of the radial recesses 9 when the axial connecting conductors 20 and 21 of the lead wires of the coils 18 of the stator 17 are received in the radial recesses 9. The risk of potting material leaking or spilling out on the underside 2.3 of the annular carrier element 2 can be reduced by limiting the opening cross-section of the radial cutouts 9 which receive the connecting conductors 20 of the leads of the coils 18 of the stator 17. On its axial end face facing the stator 17, the stop ring 14 has a hook-shaped latch element 14.1 which snaps into a predetermined position on the circumference of the stator 17 and secures the stop ring 14 in place.

[0048] Figure 5 is a schematic diagram of an assembly 1 according to the invention. The annular carrier element 2 as shown in Figure 1 is shown with the stop ring 14 as shown in Figure 4. Here, the stop ring 14 is arranged on the outer periphery of the annular carrier element 2, i.e. on the radial ring surface 2.1. The stop ring 14 is arranged to radially outwardly delimit and seal the recesses 3.1 and 3.2, so that the annular carrier element 2 has a cavity on its axial ring surface 2.2 (see Figure 1) that opens onto the upper side of the annular carrier element 2 and which cavity can be filled with potting material.

[0049] 6(a) shows a schematic view of the configuration of the assembly 1 according to the invention shown in FIG. 5, seen from below, i.e., through the underside 2.3 of the annular carrier element 2. On the underside of the radial projections 6, axially protruding support elements 16 are formed in the area of ​​the overmolded conductive socket 7. The support elements 16 are molded parts in a position corresponding to the stator teeth formed axially on the end face of the stator 17 in order to support the axial compressive stress of the radial projections 6.

[0050] Figure 6(b) shows a detailed cross section of the configuration of the assembly 1 according to the invention shown in Figure 6(a). It shows the area from the underside of the radial projections 6, on which the support elements 16 are formed. The cross section of the support elements 16 is T-shaped in the axial direction of the annular carrier element 2.

[0051] 7a shows a schematic perspective view of the stator arrangement of an electric motor according to the invention. The stator 17 consists of a stator core with radially inwardly directed stator teeth on which are arranged coils 18. The stator 17 has an axial end face 19 from which axial electrical connection conductors 20 and 21 for the leads of the coils 18 of the stator 17 protrude in the axial direction.

[0052] FIG. 7b shows the stator 17 of FIG. 7a for the electric motor with a stop ring 14. In this case, the stop ring 14 is disposed on the axial end face 19 of the stator 17 so that the axial electrical connection conductors 20 and 21 of the leads of the coils 18 of the stator 17 do not protrude axially beyond the stop ring 14. The axial electrical connection conductors 20 and 21 of the leads of the coils 18 of the stator 17 can be correspondingly shortened to facilitate assembly of the assembly 1 for establishing electrical contact. The shortening of the axial electrical connection conductors 20 and 21 of the leads of the coils 18 of the stator 17 can be provided as a method step. The hook-shaped latching element 14.1 latches or hooks onto a collar of the stator 17 formed on the outer periphery.

[0053] FIG. 7c shows the stator 17 shown in FIG. 7b together with the stop ring 14 and the annular carrier element 2 of the assembly 1 according to the invention. This figure shows the final configuration of the assembly 1 on the stator 17. In this case, electrical contact is established between the radial first electrical connection elements 4.1, 4.2, 4.3 of the first conductor element 4 and the axial electrical connection conductor 21 of the lead of the coil 18 of the stator 17, and the radial first electrical connection element 5.1 of the second conductor element 5 is in electrical contact with the axial electrical connection conductor 20 of the lead of the coil 18 of the stator 17. The cylindrical receptacle 8 of the annular carrier element 2 protrudes axially beyond the arrangement. The axial spacer elements 12 formed on the annular carrier element 2 facing the stator 17 rest on the axial end face 22 of the stator 17. The axial end face 22 of the stator 17 forms a shoulder on which the spacer elements 12 rest and support the annular carrier element 2. In this case, the spacer elements 12 are dimensioned such that an air gap is formed between the lower surface 2.3 of the annular carrier element 2 and the axial end face of the stator 17. Here, an air gap is also formed between the lower surface 2.3 of the annular carrier element 2 and the coils 18 and insulator elements of the stator 17.

[0054] Figure 7d shows in an exploded perspective view the stop ring 14 of the assembly 1 according to the invention, seen from the underside facing the stator 17. The stop ring 14 has six shutters 15 formed radially inward. Latch elements 14.1 protrude axially on the underside. The stop ring is preferably formed as an injection-molded part.

[0055] Figure 8a shows the stator 17 of Figure 7c from another angle. One of the three spacer elements 12 of the annular carrier element 2 is visible in the foreground. The spacer element 12 supports the annular carrier element 2 at its axial end face 22 so that the underside 2.3 of the annular carrier element 2 does not come into contact with the coils 18, insulator elements or insulating overmold of the stator 17. Because the spacer element 12 is supported at its axial end face 22, a distance in the form of an air gap is formed between the surface of the underside 2.3 of the annular carrier element 2 and the outer axial end face of the stator 17.

[0056] 8b shows the stator 17 shown in FIG. 8a with the stop ring 14 and annular carrier element 2 of the assembly 1 according to the invention. This figure also shows the final configuration of the assembly 1 on the stator 17 without the use of potting material. In this case, the radial first electrical connection elements 4.1, 4.2, 4.3 of the first electrical conductor element 4 are in electrical contact with the axial electrical connection conductors 21 of the leads of the coils 18 of the stator 17, and the radial first electrical connection element 5.1 of the second electrical conductor element 5 is in electrical contact with the axial electrical connection conductors 20 of the wires of the coils 18 of the stator 17. The placement of the stop ring 14 radially separates the first recess 3.1 and the second recess 3.2, forming a cavity at the top that can be filled with potting material.

[0057] Figure 8c shows in a further perspective view a detailed cross section of the arrangement shown in figure 8b of a stator 17 of an electric motor according to the invention with an assembly 1 according to the invention. It shows the support elements 16, each axially facing a radial end of a stator tooth of the stator 17. The support elements 16 support the radial projections 6 of the annular carrier element 2 axially relative to the stator teeth.

[0058] FIG. 8d shows the stop ring 14 of the assembly 1 according to the invention as in FIG. 7d in a different perspective view. [Explanation of symbols]

[0059] 1 assembly 2. Annular carrier element 2.1 Radial ring surface 2.2 Axial ring surface 2.3 Bottom surface 2.4 Radial inner circumference 3.1 First recess 3.2 Second recess 4. First Electrical Conductor Element 4.1, 4.2, 4.3 Radial first electrical connection element 5 Second Electrical Conductor Element 5.1 Radial First Electrical Connection Element 5.2 Axial second electrical connection element 6 Radial protrusion 7 Conductive socket 8 Cylindrical plug receptacle 9 Radial Cuts 10 eyelets 11 Guide Elements 12 Spacer Elements 13 Plug holder 14 Stop ring 14.1 Latching Elements 15 Shutter 16 Supporting Elements 17 Stator 18 coils 19 Axial end face 20, 21 Axial electrical connection conductor 22 Axial end face

Claims

1. 1. An assembly (1) for establishing electrical contact with an electric motor for driving a compressor formed in an automotive air conditioning system for compressing a gaseous fluid, the assembly (1) comprising: axial electrical connection conductors (20, 21) for lead wires of a coil (18) of the stator (17) protruding from an axial end face (19) of the stator (17) of the electric motor; electrical conductor elements (4, 5) for axial electrical connection of lead wires of the coil (18) of the stator (17) protruding from the axial end face (19) of the stator (17) of the electric motor; and an annular carrier element (2) formed by injection molding, the electrical conductor elements (4, 5) being overmolded with the material of the annular carrier element (2), and having radial first electrical connection elements (4.1, 4.2, 4.3, a first electrical conductor element (4) formed as an electrical bus bar; a plurality of second electrical conductor elements (5) formed as electrical bus bars; a plurality of second electrical connection elements (5.2) electrically isolated from one another; the second electrical connection elements (5.2) in the form of electrically conductive sockets (7), the sockets (7) being open on one side for receiving pin-shaped plug elements, overmolded at their outer periphery with the material of the annular carrier element (2) and integrated into the annular carrier element (2); said annular carrier element (2) having cavities in the form of radial cavities, axial cavities and / or recesses (3.1, 3.2) on its outer periphery, Assembly (1), characterized in that a stop ring (14) for the radially outer circumferential boundary of the recesses (3.1, 3.2) of the annular carrier element (2) is arranged on the radial circumference of the annular carrier element (2), the stop ring (14) having at least one latch element (14.1) for fixing its position on the annular carrier element (2).

2. 2. The assembly (1) according to claim 1, characterized in that the side of the annular carrier element (2) facing the stator (17) has at least two axial spacer elements (12) which rest on the axial end faces (22) of the stator (17) when the assembly (1) is placed on the stator (17), and the spacer elements (12) are dimensioned so that an air gap is formed between their lower faces (2.3) and the axial end faces of the stator (17).

3. Assembly (1) according to claim 1, characterized in that the first radial electrical connection elements (4.1, 4.2, 4.3, 5.1) are arranged in the cavities and / or recesses (3.1, 3.2).

4. 4. An assembly (1) according to claim 3, characterized in that in the regions of the annular carrier element (2) where the cavities in the form of radial cavities, axial cavities and / or recesses (3.1, 3.2) are formed, guides in the form of radial cutouts (9) and / or axial openings for the axial electrical connecting conductors (20, 21) of the lead wires of the coils (18) of the stator (17) are formed.

5. 2. The assembly (1) according to claim 1, characterized in that radial shutters (15) are formed on the stop ring (14), and the radial shutters (15) correspond to the radial notches (9) and / or axial openings formed on the annular carrier element (2) so as to cover the radial notches (9) and / or axial openings formed on the annular carrier element (2) when the stop ring (14) is positioned on the annular carrier element (2).

6. 6. An assembly (1) according to any one of claims 1 to 5, characterized in that the first radial electrical connection elements (4.1, 4.2, 4.3, 5.1) have openable eyelets (10) for receiving the axial electrical connection conductors (20, 21) of the leads of the coils (18) of the stator (17).

7. 2. The assembly (1) according to claim 1, characterized in that guide elements (11) for the axial electrical connection conductors (21) of the coils (18) of the stator (17) are arranged in the recesses (3.1, 3.2), the guide elements (11) being formed from radially concave recess walls facing radially outward, the guide elements (11) being arranged obliquely with respect to the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1).

8. 2. An assembly (1) according to claim 1, characterized in that a radially inwardly extending protrusion (6) is formed on the annular carrier element (2), from which the second electrical connection element (5.2) is received in the form of an outer circumferentially overmolded conductive socket (7), the outer circumferentially overmolded conductive socket (7) extending axially from the radial protrusion (6) on its upper side facing away from the stator (17).

9. 9. An assembly (1) according to claim 8, characterized in that the outer circumferentially overmolded conductive socket (7) forms a cylindrical plug receptacle (8) for the plug element.

10. 10. An assembly (1) according to claim 9, characterized in that the conductive sockets (7) overmolded onto the outer periphery are uniformly spaced apart in a direction perpendicular to the axial direction of the stator (17).

11. 11. An assembly (1) according to claim 9 or 10, characterized in that on the underside (2.3) of the annular carrier element (2) facing the stator (17), axially protruding support elements (16) are formed in the region of the radial protrusions (6).

12. 10. A method for manufacturing an assembly (1) having the features of claim 1, characterized in that a first electrical conductor element (4) and a plurality of second electrical conductor elements (5) and a socket (7) are placed in an injection mold defining the shape of the annular carrier element (2), and then a plastic material is injected into the injection mold and molded on the injection mold, whereby the electrical conductor elements (4, 5) overmold the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1) and the socket (7) are overmolded to the periphery.

13. 13. The method according to claim 12, characterized in that the second electrical conductor element (5) has a plug receptacle (13) for the conductive socket (7), and the conductive socket (7) is plugged into the plug receptacle (13) of the second electrical conductor element (5) before being inserted into the injection mold.

14. 1. An electric motor for driving a compressor formed in a motor vehicle air conditioning system for compressing a gaseous fluid, the electric motor having a rotor and a stator (17) arranged to extend along a common longitudinal axis, and an assembly (1) according to claim 1, the electric motor having electrical connection conductors (20, 21) arranged on axial end faces (19) of the stator (17) for establishing electrical contact with the electric motor, the stator (17) being formed as sections of electrical leads of a coil (18), the electrical connection conductors (20, 21) being connected to radial first electrical connection elements (4.1, 4.2, 4.3, axial electrical connection conductors (20, 21) of electrical conductor elements (4, 5) on the axial end faces (19) of the stator (17) projecting axially from the stator (17) so that the axial electrical connection conductors (20, 21) are in direct contact with the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1) of the leads of the coils (18), and in each case the axial first electrical connection elements (4.1, 4.2, 4.3, 5.1) correspond to the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1), and the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1) in electrical contact with the axial electrical connection conductors (20, 21) of the leads of the coils (18) are surrounded by a hermetically sealing potting material.

15. 15. Electric motor according to claim 14, characterized in that axial spacer elements (12) adjacent to the outer periphery of the stator (17) rest on the axial end faces (22) of the stator (17) to maintain a distance between the lower face (2.3) of the annular carrier element (2) and the stator (17).

16. 15. Electric motor according to claim 14, characterized in that the side of the annular carrier element (2) facing the stator (17) has at least two axial spacer elements (12) resting on the axial end faces (22) of the stator (17), the spacer elements (12) being dimensioned such that an air gap is formed between the lower face (2.3) of the annular carrier element (2) and the axial end faces of the stator (17).

17. 10. A method of assembling an assembly (1) according to claim 1 for establishing electrical contact with a compressor driving motor formed in a vehicle air conditioning system for compressing a gaseous fluid, comprising the steps of: Axial orientation of the electrical connection conductors (20, 21) of the lead wires of the coil (18) protruding from the stator (17) of the electric motor on the axial end face (19) of the stator (17); placing the annular carrier element (2) on the axial end face (19) of the stator (17) and bringing the axial electrical connection conductors (20, 21) of the leads of the coil (18) into contact with the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1); connecting said axial electrical connection conductors (20, 21) to said radial first electrical connection elements (4.1, 4.2, 4.3, 5.1); and introducing a potting material so as to hermetically seal the axial electrical connection conductors (20, 21) and the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1) that are in electrical contact with and electrically connected to the axial electrical connection conductors (20, 21).

18. 18. The method according to claim 17, characterized in that the connection between the axial electrical connection conductors (20, 21) and the radial first electrical connection elements (4.1, 4.2, 4.3, 5.1) is provided by adhesive or mechanical means.

19. Use of an electric motor for driving a compressor for compressing a gaseous fluid according to claim 15 in a refrigerant circuit of an air conditioning system of a vehicle.

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