Device and method for connecting a stator and a pulse inverter of an electric motor of an at least partially electrically powered motor vehicle and motor vehicle with an electric motor

Abstract

Connecting device (22) for detachably, electrically conductively connecting a stator (14) of an electric motor (12) of an at least partially electrically powered motor vehicle (10) to a pulse inverter (16) of the electric motor (12), wherein the connecting device (22) comprises one or more pairs of clamping pieces, each with two clamping pieces (24, 26) arranged movably relative to each other, which are movable towards and away from each other along a predetermined clamping direction (28) between a closed and an open position, wherein the clamping pieces (24, 26) are designed to clamp at least one stator-side conductor end (18) with at least one pulse inverter-side conductor end (20) between themselves in such a way that an electrically conductive connection of the conductor ends (18, 20) is established with each other. wherein the connecting device (22) has a bolt (32) rotatably mounted about an axis of rotation (34) extending obliquely with respect to the clamping direction (28), wherein the bolt (32) has an eccentric section (36) along its longitudinal extension direction for each pair of clamping elements of the connecting device (22), wherein the eccentric section (36) is designed to convert a rotary movement of the bolt (32) about the axis of rotation (34) in a closing direction into a translational movement of the two clamping pieces (24, 26) of the respective clamping piece pair towards each other until the closed position is reached, characterized by the fact that A first clamping element (24) of a respective pair of clamping elements has a receiving area formed by two opposing lateral legs (30.1, 30.2) for receiving a second clamping element (26) of the pair of clamping elements, wherein the second clamping element (26) is arranged within the receiving area and is movable along the clamping direction (28) between the legs (30.1, 30.2) relative to the first clamping element (24), wherein the bolt (32) extends at least partially within the second clamping element (26), wherein the eccentric section (36) of the bolt (32) associated with the respective pair of clamping elements, during rotational movement, presses through an opening (38) in a side surface of the second clamping element (26) facing a first leg (30.1) onto the first leg (30.1), thereby causing the second clamping element (26) to be pressed onto the second leg to establish the closed position. (30.2) too moved.

Description

[0001] The invention relates to a connecting device and a connecting method for detachably and electrically conductively connecting a stator to a pulse-controlled inverter of an electric motor. Furthermore, the invention relates to an electric motor having such a connecting device and a motor vehicle having such an electric motor.

[0002] The detachable, electrically conductive connection of current-carrying or electrically conductive cable ends to one another can be achieved by clamping the cable ends together between two clamping pieces arranged so as to be movable relative to one another. The two clamping pieces arranged so as to be movable relative to one another can be arranged to form a clamping piece pair and can be moved toward and away from one another between a closed and an open position along a predetermined clamping direction. In the closed position, the cable ends can be clamped between the clamping pieces of a respective clamping piece pair in such a way that an electrically conductive connection between the cable ends is established.

[0003] Such clamp connections are known, for example, from WO 2012 / 59831 A1 or from DE 10 2017 205 970 A1.

[0004] EP 4 210 204 A1 also describes a connecting device for connecting two busbar ends of an electrical machine. The busbar ends are held within the connecting device by a restoring force exerted by elastic deformation of the connecting device.

[0005] In known clamp connections, the clamping pieces are generally moved towards one another by rotating a clamping screw about a rotation axis. The rotation axis of the clamping screw runs essentially parallel to the predetermined clamping direction. In other words, the clamping screw must be accessible in its axial extension in order to be rotated and thus create the clamp connection. Depending on the installation space situation and / or the arrangement of the components to be connected in relation to one another, this accessibility of the rotation screw cannot always be guaranteed. This can mean that the electrically conductive connection of the individual components of the electric motor must be made, for example, outside the vehicle or before the motor is installed in the vehicle. This disadvantageously reduces the efficiency of manufacturing motor vehicles with such electric motors.

[0006] JP H05 - 94 955 U discloses a connecting device with a pair of clamping pieces. A rotatably mounted bolt is provided in one of the clamping pieces of the clamping piece pair. The bolt has a bore eccentrically arranged with respect to the axis of rotation of the bolt, into which a shaft can be inserted. By rotating the bolt around the shaft, an eccentric section of the bolt is rotated in the direction of a contact surface between the clamping pieces, so that the clamping pieces are moved toward each other.

[0007] Also known from US 3 491 329 A is a connecting device for cable ends, which moves clamping pieces towards each other by means of a rotation of an eccentrically designed bolt.

[0008] An object of the present invention is to increase the efficiency in the assembly of motor vehicles with electric motors, whereby the known advantages of the clamp connection described are to be utilized.

[0009] The problem is solved by the subject matter of the independent patent claims. Advantageous developments of the invention are described by the dependent patent claims, the following description, and the figures.

[0010] The invention provides a connecting device or a connecting piece for the detachable, electrically conductive connection of a stator of an electric motor of an at least partially electrically powered motor vehicle to a pulse-controlled inverter of the electric motor. The connecting device comprises one or more clamping piece pairs, each consisting of two clamping pieces arranged so as to be movable relative to one another. The clamping pieces are arranged so as to be movable toward and away from one another along a predetermined clamping direction between a closed and an open position. The clamping pieces can preferably also be fixed or held in any position between the closed and the open position.

[0011] In the closed position, the clamping pieces clamp at least one stator-side cable end with at least one pulse-controlled inverter-side cable end between them in such a way that an electrically conductive connection between the cable ends is established. In other words, the clamping pieces are designed to clamp the two cable ends between them in the closed position in such a way that they are electrically conductively connected to one another. There are no special requirements regarding the electrical conductivity of the clamping pieces. However, they are preferably electrically insulated at least from the surroundings of the respective clamping piece pair.

[0012] According to the invention, the connecting device comprises a bolt or clamping bolt rotatably mounted about an axis of rotation extending obliquely with respect to the predetermined clamping direction. In other words, the bolt has an elongated shape, with an axis of rotation of the bolt extending along the longest axis of the elongated shape, which axis of rotation is arranged obliquely with respect to the predetermined clamping direction in the connecting device. Preferably, the axis of rotation runs centrally through the bolt along its longitudinal direction.

[0013] The bolt has an eccentric section for each pair of clamping pieces of the connecting device along its longitudinal direction, i.e., parallel to the aforementioned axis of rotation. In other words, the bolt has one or more eccentric sections along its longitudinal direction, which can be connected to one another. The eccentric sections can also be spaced apart from one another at predetermined distances along the longitudinal direction of the bolt. The bolt therefore has a rotationally symmetrical, for example, cylindrical, base body that is rotationally symmetrical about the aforementioned axis of rotation. In the region of the respective eccentric sections, the rotationally symmetrical base body has bulges or protrusions. In other words, a center point of a cross-section of the bolt in the region of a respective eccentric section lies outside the axis of rotation.

[0014] According to the invention, the bolt with the eccentric sections is arranged in the connecting device such that each pair of clamping pieces of the connecting device is assigned such an eccentric section. In other words, an eccentric section is located at the level of each pair of clamping pieces.

[0015] According to the invention, the eccentric section is designed to convert a rotational movement of the bolt about the axis of rotation in a closing direction of rotation into a translational movement of the two clamping pieces of the respective clamping piece pair assigned to it relative to one another until the closed position is reached. In other words, the bolt with the eccentric section is arranged spatially in the connecting device relative to the clamping piece pair assigned to it such that the eccentric section initially comes into contact with a first of the clamping pieces of the respective clamping piece pair during the rotational movement about the axis of rotation in the closing direction, wherein as rotation progresses, the eccentric section presses against the first of the clamping pieces in such a way that it is moved along the clamping direction towards the second of the clamping pieces of the clamping piece pair until the closed position is reached.

[0016] The inventive design of the connecting device offers the advantage that the predetermined clamping direction and the rotational axis of the clamping bolt or bolt do not run parallel to one another, but can be arranged at an angle to one another. Depending on the geometric configuration of the described eccentric section, the inclination of the bolt's rotational axis with respect to the predetermined clamping direction can be adapted to an existing installation space situation during assembly of the described electric motor. This significantly improves the efficiency of the described assembly compared to known solutions. At the same time, the advantages of the clamping connection are fully available. For example, manufacturing-related tolerances of the components to be connected can be easily compensated.In addition, a reproducible clamping force can be set in a contact area between the cable ends to be electrically connected. The described contact can also be removed and reconnected as often as required. This simplified assembly process is accompanied by a reduction in assembly time.

[0017] According to the invention, a first of the clamping pieces of a respective pair of clamping pieces has a receiving area formed by two opposing, lateral legs for receiving a second of the clamping pieces of the pair of clamping pieces. In other words, the first clamping piece can be formed on three sides with two opposing, in particular parallel, legs and a central piece connecting the two legs. The second clamping piece of the pair of clamping pieces is arranged within the receiving area, which is framed by the legs and the central piece, and is movable relative to the first clamping piece along the clamping direction between the legs. In other words, the second clamping piece can be pushed back and forth between the legs along the clamping direction.Alternatively or additionally, the first clamping piece can be displaced relative to the second clamping piece along the clamping direction such that one of the lateral legs and the first clamping piece are moved toward or away from each other. In this way, a clamping effect can be established between the first clamping piece and one of the lateral legs.

[0018] According to the invention, the bolt extends at least partially within the second clamping piece, wherein the eccentric section of the bolt assigned to the respective pair of clamping pieces presses against the first leg during the rotational movement of the bolt about the rotation axis through an opening in a side surface of the second clamping piece facing a first of the legs, and the second clamping piece thereby moves towards a second of the legs to establish the closed position. In other words, the eccentric section of the bolt comes into contact with the first of the legs during the rotational movement of the bolt in the closing direction of rotation. As the rotational movement continues, the eccentric section presses against the first leg in such a way that the second clamping piece is moved towards the second leg relative to the first clamping piece. In other words, the eccentric section pushes the second clamping piece off the first leg in the direction of the second leg.

[0019] The invention with the bolt running at least partially within the second clamping piece has the advantage that this enables a particularly compact design of the connecting device.

[0020] The invention also includes embodiments which provide additional advantages.

[0021] One embodiment provides that the axis of rotation encloses an angle of between 10 degrees and 90 degrees inclusive with the predetermined clamping direction. Thus, in an extreme case, the clamping direction can run perpendicular to the direction of rotation or axis of rotation of the bolt. This advantageously results in a particularly favorable spatial arrangement during assembly of the described electric motor. A geometric shape of a circumferential surface of the bolt in the region of a respective eccentric section can be adapted to a geometric shape of the clamping pieces in such a way that an angle between the axis of rotation of the bolt and the predetermined clamping direction can be adjusted as required.

[0022] Alternatively or additionally, the bolt can be arranged at least partially between the two clamping pieces, in particular partially within the described receiving area between the first and second clamping pieces. In particular, the bolt can be arranged at least partially between one of the described legs of the first clamping piece and the second clamping piece.

[0023] An advantageous development provides that the first leg has a snap element, wherein the eccentric section has a locking element complementarily configured thereto, which is designed to engage with the snap element upon reaching the closed position to form a locking snap connection. In other words, the eccentric section can be fixed upon reaching the closed position by establishing the locking snap connection on the first leg or along a side wall of the first leg facing the receiving area. This advantageously prevents over-tightening of the eccentric section.

[0024] Alternatively or additionally, the first leg may have a stop along the described side wall or side surface, wherein the eccentric section rests against the stop when the closed position is reached.

[0025] Alternatively or additionally, the bolt can be provided with a recess and / or a locking mechanism along the eccentric section, particularly on an end wall of the eccentric section. This allows the bolt to be fixed in the closed position, thus permanently ensuring clamping. Additionally or alternatively, the described stop can be provided in one or both of the clamping pieces, ensuring that the bolt does not rotate during assembly.

[0026] Preferably, the bolt and one or both of the clamping pieces differ in the elasticity of their respective materials. Preferably, the bolt comprises a material that is less elastic than the clamping pieces. This advantageously increases friction between the eccentric portion of the bolt and the clamping pieces.

[0027] A further aspect of the invention relates to a motor vehicle with an electric motor and a connecting device according to the invention. The electric motor has a stator and a pulse-controlled inverter, wherein the connecting device comprises one or more clamping piece pairs, each consisting of two clamping pieces arranged so as to be movable relative to one another, which can be moved toward and away from one another along a predetermined clamping direction between a closed and an open position. In the closed position, the clamping pieces are designed to clamp at least one stator-side cable end with at least one pulse-controlled inverter-side cable end between them in such a way that a conductive connection between the cable ends is established.

[0028] According to the invention, the connecting device has a bolt which is mounted so as to be rotatable about an axis of rotation which runs obliquely with respect to the clamping direction and which has an eccentric section along its longitudinal direction of extension for each pair of clamping pieces of the connecting device, which eccentric section is designed to convert a rotational movement of the bolt about the axis of rotation in a closing direction of rotation into a translational movement of the two clamping pieces of the respective pair of clamping pieces towards one another or towards one another until the closed position is reached.

[0029] A further aspect of the invention is directed to an electric motor with a connecting device according to the invention.

[0030] A further aspect of the invention relates to a method for detachably and electrically conductively contacting or connecting a stator and a pulse-controlled inverter of such an electric motor of an at least partially electrically powered motor vehicle. Initially, the stator and the pulse-controlled inverter of the electric motor are provided. In this case, a respective stator-side cable end and a respective pulse-controlled inverter-side cable end are arranged opposite one another in a required installation position of the electric motor in the motor vehicle. The cable ends are then detachably and electrically conductively connected to one another by means of the connecting device according to the invention.This can be achieved, for example, by inserting or placing the cable ends—i.e., the respective stator-side cable end and the respective pulse-controlled inverter-side cable end to be connected—together between the two clamping pieces of a clamping piece pair of the connecting device. The clamping pieces of the clamping piece pair are then moved toward each other along the predetermined clamping direction by rotating the bolt around the rotation axis that runs obliquely relative to the clamping direction.

[0031] Typically, an electric motor with a stator and a pulse-controlled inverter has several cable ends that need to be connected together. Typically, several of the cable ends or pairs of cable ends are assigned to the same phase.

[0032] An advantageous development of the method according to the invention therefore provides that several or all of the stator-side and pulse-controlled inverter-side cable ends of the same phase are detachably electrically connected to one another by a common connecting device with a corresponding number of clamping piece pairs. In other words, the number of clamping piece pairs preferably corresponds to the number of cable pairs to be connected. This advantageously further accelerates the assembly of the described electric motor.

[0033] The invention also includes further developments of the motor vehicle according to the invention and / or the electric motor according to the invention and / or the method according to the invention, which have features as already described in connection with the further developments of the connecting device according to the invention. For this reason, the corresponding further developments of the motor vehicle according to the invention and / or the electric motor according to the invention and / or the method according to the invention are not described again here.

[0034] The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle.

[0035] The invention also encompasses combinations of the features of the described embodiments. The invention therefore also encompasses implementations that each comprise a combination of the features of several of the described embodiments, unless the embodiments are described as mutually exclusive.

[0036] Exemplary embodiments of the invention are described below. Shown are: Fig. 1 a schematic overview of an at least partially electrically driven motor vehicle with an electric motor and a connecting device; Fig. 2 a schematic longitudinal sectional view of a preferred embodiment of the connecting device according to the invention; Fig. 3 a schematic representation of a preferred embodiment of a bolt with an eccentric section; and Fig. 4 a schematic representation of a method for producing a detachable, electrically conductive connection between a stator and a pulse inverter of an electric motor.

[0037] The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that can be considered independently of one another, each of which also develops the invention independently of one another. Therefore, the disclosure is intended to encompass combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

[0038] In the figures, the same reference symbols designate elements with the same function.

[0039] Fig. 1 shows a schematic representation of a motor vehicle 10, wherein the motor vehicle 10 is preferably an at least partially electrically driven motor vehicle 10. As such, the motor vehicle 10 has an electric motor 12 with a stator 14 and a pulse inverter 16. In addition, Fig. 1 schematically shows a stator-side line end 18 and a pulse-controlled inverter-side line end 20. It goes without saying that this illustration is purely schematic and that a plurality of such line ends 18, 20 may be present.

[0040] The cable ends 18 and 20 are as shown in Fig. 1 are detachably and electrically conductively connected to one another by a connecting device 22 described in more detail below.

[0041] Fig. Figure 2 shows a schematic longitudinal section of a preferred embodiment of the described connecting device 22. The connecting device 22, as shown in Fig. 2, comprises a pair of clamping pieces with a first clamping piece 24 and a second clamping piece 26 arranged movably relative to the first clamping piece 24. The two clamping pieces 24, 26 are movable relative to each other along a predetermined clamping direction 28. Thus, the clamping piece 26 can be moved back and forth along the clamping direction 28 between two legs 30.1 and 30.2 of the first clamping piece 24. As shown in Fig. 2, the two legs 30.1 and 30.2 are arranged opposite each other and frame a receiving area for the second clamping piece 26.

[0042] According to the Fig. 2, the connecting device 22 has a bolt 32 which runs at least partially within the second clamping piece 26 or is integrated into it. The bolt 32 has an axis of rotation 34 along its longitudinal direction. In the example shown here, the axis of rotation 34 forms an angle of 90 degrees with the predetermined clamping direction 28. In other words, the axis of rotation 34 is perpendicular to the predetermined clamping direction 28. When the bolt 32 rotates about the axis of rotation 34, an eccentric section 36 of the bolt 32 is moved through an opening 38 in a side surface of the second clamping piece 26 facing the first of the legs 30.1, so that the eccentric section 36 presses against the first leg 30.1. As a result, the second clamping piece 26 is moved towards the second leg 30.2 along the predetermined clamping direction 28 to establish the closed position.

[0043] Fig. Figure 3 shows a schematic detailed view of the described bolt 32 with the eccentric section 36. The bolt has an engagement opening 40 into which a correspondingly designed tool head can be engaged in order to rotate the bolt 32 about the rotation axis 34. The engagement opening 40 can, for example, be designed in the form of a hexagon socket.

[0044] The eccentric section 36 of the bolt 32 according to Fig. 3 also has a recess or a locking element 42 along its front side, which can be engaged with a snap element of complementary design to prevent further rotation of the bolt 32 upon reaching the closed position. This snap element (not shown) can, for example, be arranged along an inner side of the first leg 30.1 facing the receiving area, as in Fig. 2 shown.

[0045] Fig.Finally, Figure 4 shows a schematic representation of a method for detachably electrically conductively contacting a stator 14 and a pulse-controlled inverter 16 of an electric motor 12 of an at least partially electrically powered motor vehicle 10. First, the stator 14 and the pulse-controlled inverter 16 are provided, wherein, in a step S1, a respective stator-side cable end 18 and a respective pulse-controlled inverter-side cable end 20 are arranged opposite one another. Then, in a step S2, a connecting device 22 is placed onto the cable ends 18, 20 to be connected in such a way that they are inserted between two clamping pieces 24, 26 of a pair of clamping pieces of the connecting device 22.In a subsequent step S3, a turning tool, for example a screwdriver, is inserted into an engagement opening 40 of a bolt 32 of the connecting device 22, and the bolt 32 is rotated about its rotational axis 34 in a closing direction using the turning tool. The bolt 32 has an eccentric section 36 which, during the rotational movement, converts the rotation of the bolt 32 into a translational movement of the two clamping pieces 24, 26 toward each other along a predetermined clamping direction 28 (step S4). When a closed position of the clamping piece pair is reached, the final step S5 intervenes.

[0046] Locking element 42 of the eccentric section 36 into a complementary snap element of one of the clamping pieces 24, 26 in order to fix the bolt in the closed position.

[0047] Overall, the examples show how an improved contact between a stator and a pulse inverter of an electric motor can be provided.

Claims

[1] A connecting device (22) for the detachable, electrically conductive connection of a stator (14) of an electric motor (12) of an at least partially electrically driven motor vehicle (10) to a pulse-controlled inverter (16) of the electric motor (12), wherein the connecting device (22) comprises one or more clamping piece pairs, each with two clamping pieces (24, 26) arranged such that they can be moved towards and away from one another along a predetermined clamping direction (28) between a closed and an open position, wherein the clamping pieces (24, 26) are designed, in the closed position, to clamp at least one stator-side line end (18) with at least one pulse-controlled inverter-side line end (20) between them in such a way that an electrically conductive connection of the line ends (18, 20) to one another is established, wherein the connecting device (22) has a bolt (32) rotatably mounted about an axis of rotation (34) extending obliquely with respect to the clamping direction (28), wherein the bolt (32) has an eccentric section (36) along its longitudinal direction for each pair of clamping pieces of the connecting device (22), wherein the eccentric section (36) is designed to convert a rotational movement of the bolt (32) about the rotational axis (34) in a closing direction into a translational movement of the two clamping pieces (24, 26) of the respective clamping piece pair relative to each other until the closed position is reached, characterized by , that a first of the clamping pieces (24) of a respective clamping piece pair has a receiving area formed by two opposite, lateral legs (30.1, 30.2) for receiving a second of the clamping pieces (26) of the clamping piece pair, wherein the second clamping piece (26) is arranged within the receiving area and is movable along the clamping direction (28) between the legs (30.1, 30.2) relative to the first clamping piece (24), wherein the bolt (32) extends at least partially within the second clamping piece (26), wherein the eccentric section (36) of the bolt (32) assigned to the respective clamping piece pair presses on the first leg (30.1) through an opening (38) in a side surface of the second clamping piece (26) facing a first of the legs (30.1) during the rotational movement, and the second clamping piece (26) is thereby pressed onto the second leg to establish the closed position (30.2) to move. [2] Connecting device (22) according to claim 1, wherein the axis of rotation (34) forms an angle between 10 degrees and 90 degrees inclusive with the predetermined clamping direction (28). [3] Connecting device (22) according to one of the preceding claims, wherein the bolt (32) is arranged at least in sections within the receiving area between the first clamping piece (24) and the second clamping piece (26). [4] Connecting device (22) according to one of the preceding claims, wherein the first leg (30.1) has a snap element, and wherein the eccentric section (36) has a locking element (42) complementary thereto, which is designed to engage in the snap element when the closed position is reached to form a locking-snap connection. [5] Connecting device (22) according to one of the preceding claims, wherein the first leg (30.1) has a stop, wherein the eccentric section (36) rests against the stop when the closed position is reached. [6] Connecting device (22) according to one of the preceding claims, wherein the bolt (32), in particular the eccentric section (36) of the bolt (32), has a material which is less elastic than the clamping pieces (24, 26). [7] Motor vehicle (10) with an electric motor (12) and a connecting device (22) according to one of the preceding claims, wherein the electric motor (12) has a stator (14) and a pulse-controlled inverter (16), wherein the connecting device (22) comprises one or more clamping piece pairs, each with two clamping pieces (24, 26) arranged such that they can be moved towards and away from one another along a predetermined clamping direction (28) between a closed and an open position, wherein the clamping pieces (24, 26) are designed, in the closed position, to clamp at least one stator-side line end (18) with at least one pulse-controlled inverter-side line end (20) between them in such a way that an electrically conductive connection of the line ends (18, 20) is established. wherein the connecting device (22) has a bolt (32) rotatably mounted about a rotational axis (34) extending obliquely with respect to the clamping direction (28), wherein the bolt (32) has an eccentric section (36) along its longitudinal direction of extension for each pair of clamping pieces of the connecting device (22), wherein the eccentric section (36) is designed to convert a rotational movement of the bolt (32) about the rotational axis (34) in a closing rotational direction into a translational movement of the two clamping pieces (24, 26) of the respective pair of clamping pieces relative to one another until the closed position is reached, characterized by , that a first of the clamping pieces (24) of a respective clamping piece pair has a receiving area formed by two opposite, lateral legs (30.1, 30.2) for receiving a second of the clamping pieces (26) of the clamping piece pair, wherein the second clamping piece (26) is arranged within the receiving area and is movable along the clamping direction (28) between the legs (30.1, 30.2) relative to the first clamping piece (24), wherein the bolt (32) extends at least partially within the second clamping piece (26), wherein the eccentric section (36) of the bolt (32) assigned to the respective clamping piece pair presses on the first leg (30.1) through an opening (38) in a side surface of the second clamping piece (26) facing a first of the legs (30.1) during the rotational movement, and the second clamping piece (26) is thereby pressed onto the second leg to establish the closed position (30.2) to move. [8] Method for detachably, electrically conductively contacting a stator (14) and a pulse inverter (16) of an electric motor (12) of an at least partially electrically driven motor vehicle (10) according to claim 7, wherein - the stator (14) and the pulse inverter (16) are provided, - a respective stator-side line end (18) and a respective pulse inverter-side line end (20) are arranged opposite one another, and - the cable ends (18, 20) are detachably and electrically conductively connected to one another by means of a connecting device (22) according to one of claims 1 to 6. [9] Method according to claim 8, wherein several or all stator-side and pulse inverter-side line ends (18, 20) of the same phase are detachably electrically connected to one another by a common connecting device (22) with a corresponding number of clamping piece pairs.

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