EP3785330A1

EP3785330A1 - Cable lug, connecting pin and electric three-phase drive system and drive system

Info

Publication number: EP3785330A1
Application number: EP19733658.9A
Authority: EP
Inventors: Damir ALIHODZIC; Frank Skrzypinski
Original assignee: MTU Friedrichshafen GmbH
Current assignee: Rolls Royce Solutions GmbH
Priority date: 2018-04-26
Filing date: 2019-04-18
Publication date: 2021-03-03
Also published as: DE102018003391B4; CN112189282A; DE102018003391A1; WO2019206354A1

Abstract

The present invention relates to a cable lug (1) having a connecting ring (3) for connecting the cable lug (1) to a connecting pin (7). A coding (15) which corresponds to a coding (19) formed on an outer side (18) of the connecting pin (7) is formed on an inner side (14) of the connecting ring (3). The present invention also relates to a connecting pin (7) for connecting a connecting ring (3) of a cable lug (1). A coding (19) which corresponds to a coding (15) formed on an inner side (14) of the connecting ring (3) is formed on an outer side (18) of the connecting pin (7). The invention further relates to an electric three-phase system (25) having three terminals for three three-phases (U, V, W), and to a drive system (27) having said type of electric three-phase system (25).

Description

DESCRIPTION

Lug, pin and electric three-phase and drive system

The present invention relates to a cable lug with a connection ring for connecting the cable lug to a pin and a pin; for connecting a connection ring of a cable lug. The present invention further relates to a three-phase electrical system and a drive system with a three-phase electrical system.

Generic cable lugs and cooperating pins are

preferably used to form electrical connections to electrical equipment, in particular electric machines and converters. Pins are hereby usually threaded pins, which continue to be regularly in the context of electrical Anschlußfeldem (e.g.

Terminal strips), which are e.g. have two, three or more pins. To make an electrical connection of the cable lug with its connection ring on the pin; guided so that the pin; with a section through the connection ring passes. Via e.g. a mother, screwed on the

Pin, the electrical connection can then be made or secured permanently.

When connecting an E-machine to the associated inverter, e.g. To form a drive train, in the case of a three-phase connection, connect three equivalent cables to the terminal block of the electric motor and to the terminal strip of the drive.

This is a likelihood of confusion. To reduce this risk, the assignment of the motor phase terminals U, V, W to the inverter terminal terminals U, V, W is regularly solved by cable designations. Again, there is a mix-up by, for example

Inattention possible.

Fig. 1 shows a cable lug G according to the prior art. The cable lug G has a connection ring 3 ', which is formed annular disk-shaped, wherein the connection ring 3' has a circular passage opening 5 ', that is for the connection or the mounting to a pin; T according to the state of the art, s. Fig. 2, which is e.g. as a threaded pin

confirmation copy (Thread not shown) may be provided (the pin 7 'is formed for example on a connection pad 9' or a terminal block (indicated in Fig. 2)).

In the context of such a connection, the connecting pin 7 '- provided with a circular cross section and a corresponding dimension with respect to the passage opening 5' - passes through the passage opening 5 'with a section. On the connection ring 3 'of the cable lug 1', a fastening portion 11 'is further formed, which of the

Connecting ring 3 'on the outside (radial) protrudes and forms a mounting end 13' of the cable shoe G, that is to (electrically conductive) attachment to a conductor strand (not shown in the figures). In the present case, the cable lug G, for example, for a squeeze or

Crimp connection set up, in particular by means of a slotted crimp sleeve of the

Fastening 13 '. Connecting ring 3 'and sleeve are made of metal.

The problem with the connection of such a cable lug 1 'is that with this a faulty connection to a not intended to be connected to it

Pin 7 'is insufficiently preventable, woneben also an unwanted rotation when connected to a pin 7' according to the prior art is possible.

Proceeding from this, the present invention seeks to minimize the risk of producing a faulty electrical connection when connecting a cable lug to a pin.

This object is achieved by a cable lug with the features of claim 1, a pin with the features of claim 6, a three-phase electrical system with the features of claim 11 and a drive system with the features of claim 12.

Advantageous developments and embodiments of the invention are specified in the dependent claims.

The cable lug according to the invention has a connection ring for connecting the cable lug to a connection pin. On an inner side of the connecting ring, a coding is formed, which corresponds to a coding formed on an outer side of the connecting pin. The connecting ring of the cable lug is used in particular for mounting on the connecting pin, in particular in the form of a threaded pin (eg bolt-shaped). The connection ring represents insofar an annular connection element. The cable lug can also be referred to as a ring cable lug. As part of a mounting of the connection ring on the pin, the terminal pin at least over a portion of the connection ring penetrate (in particular a through hole of the connection ring), after which a permanently positionally stable fixation, for example by (clamping) screwing with a screw, such as a nut, be provided can.

The cable lug can furthermore, for example as a projection or continuation, be integrally formed on the connection ring or formed integrally therewith, in a conventional manner have a fastening end for (electrically conductive) connection to a cable or a conductor strand. In this case, the attachment end, for example, for a customary with cable lugs connection, such as a crimp (crimp), a connector, a solder joint, a

Screw connection or a combination thereof, be provided or set up. In general, the connection ring, in particular together with the fastening end (electrically conductive), may preferably be made of metal, for example of a sheet metal, furthermore punched, for example. Furthermore, an insulating material may be provided for sheathing at the attachment end, e.g. a shrink tube or the like.

The connecting pin according to the invention for connecting a connecting ring of a cable lug has, on an outer side of the connecting pin, a coding which corresponds to a coding formed on an inner side of the connecting ring.

In particular, the connecting pin can be used together with the connecting ring of the cable lug mounted on it for the joint formation of an electrical connection. Preferably, the pin is a threaded pin, which is in particular bolt-shaped, in particular conductive, preferably made of metal.

With the invention, a connection solution for forming an electrical connection is provided, which by means of correspondence-coded connecting elements in the form of

Connecting ring and the pin the risk of faulty electrical connection especially due to a connection of the cable lug to a pin not assigned to the terminal pin at least reduced.

For internal coding is preferably a structure or coding structure on

Connecting ring is provided, which mechanically interacts with or interacts with a structure or coding structure on the outside correspondence coded pin

preferably with the formation of corresponding cross sections on connecting ring (inside) and connecting pin (outside). Preferably, the passage opening of the connection ring including the inside coding has a cross section which corresponds to a cross section which is formed including the coding on the connection pin. This applies in particular to that section of the connecting pin which is provided for passage through the passage opening of the connecting ring.

The corresponding cross sections provided with such coding structures

Connecting ring and pin can preferably act locking or torsionally, for example, form Verzahn- or locking elements, e.g. as it were a tongue and groove lock. Furthermore, a relative position between connecting ring and

Pin can be advantageously specified via the arrangement of such coding structures. In this relative position then a connection of pin and correspondence coded connection ring (union of the connection ring on the pin) is only possible.

In one embodiment of the invention, the coding of the cable lug on the inside of the connecting ring is externally designed so that they directly connect to the

Cable lug characterized. The same applies to an embodiment of the terminal pin, wherein the coding on its outer side is designed externally so that it directly characterizes a connection with the pin.

Due to the special configuration of the respective coding, the connection or the connection is advantageously symbolized or marked outwards to a viewer or user in a specific, predefined manner. The viewer or user can therefore immediately, immediately recognize what the cable lug and / or the connecting ring is or will be used. These relationships may also be referred to such that the respective corresponding coding on the terminal pin and the terminal ring is designed to be "speaking" with respect to an intended use of the connection or terminal. When connecting the cable lug, the matching, associated pin can be assigned directly. Mixing of cable lugs and / or pins can thus advantageously be virtually eliminated. The complete connection is formed in particular with the connection pin and the cable lug connected to it.

In a further embodiment of the cable lug, the coding on the inside of the connection ring is designed such that it characterizes the type, the type, the function, the meaning and / or the purpose of the connection with the cable lug. The same applies to a further embodiment of the connecting pin, according to which the coding on the outside of the connecting pin is designed such that it characterizes the type, the type, the function, the meaning and / or the purpose of the connection with the connecting pin. This allows an assignment of cable lug and pin even better, more accurate and easier. Faulty connections and connections can be prevented even better.

In one embodiment of the cable lug, the coding on the inside of the connecting ring is designed such that it refers to a three-phase phase of a three-phase electrical system, which is assigned to the connection with the cable lug. The same applies to a further embodiment of the connecting pin, according to which the coding on the outside of the

Terminal pin is designed so that it is dependent on a three-phase phase of an electric

Three-phase system, which is assigned to the connection with the pin. The reference to the three-phase phase takes place in particular immediately. A viewer, user or user, it is possible to recognize directly due to the design of the coding that a three-phase phase is assigned to the cable lug or pin and in particular which exactly.

In a further embodiment of the cable lug, the coding on the inside of the connecting ring is U-shaped, V-shaped or W-shaped. The same applies to a further embodiment of the connecting pin, according to which the coding on the outer side of the connecting pin is U-shaped, V-shaped or W-shaped. Based on these

Embodiment of the coding, it is particularly easy to reliably recognize the assignment of the cable lug or the connecting ring to the three-phase phase.

The present invention further relates to a three-phase electrical three-phase system for three three-phase phases (U, V, W), wherein the terminals each having a cable lug according to the invention and / or each formed with a erfmdungsgemäßen pin. In such a three-phase system, it is particularly important that the

Assignments of the three AC phases to the terminals are done correctly and safely. This is ensured due to the invention in a particularly simple manner. In the electric three-phase system, the respective coding of the cable lugs and / or pins is configured in particular such that it directly refers to the three-phase phase of the electric three-phase system assigned to the respective connection. In this case, a first of the codings of the cable lugs and / or pins of the connections for the three-phase current U-shaped, a second of the codes V-shaped and a third of the codes W-shaped be configured.

A connection field may have a plurality of connection pins according to the invention, the codes of the plurality of connection pins being different. In particular, the connection field can be an electrical connection field. Such a connection field can be provided, for example, for connecting an inverter to an electrical machine. The connection field is designed, for example, as a connection strip. Furthermore, it can be used particularly advantageously for an electric three-phase system, in particular for the connection of the three-phase phases U, V, W. Here, the individual pins of the connection field can each be assigned to a three-phase phase. The outside codes of the pins are in particular U-, V- or W-shaped configured. Advantageously, the respective cross-sectional area of the codings U-, V- or W-shaped configured. As a result, "speaking" or the three-phase phase U, V or W communicating codings are realized (for example, formed by means of a corresponding notched and / or raised coding structure).

In one embodiment of the present invention, such an arrangement may be provided in which the coded cable lug (via the connection ring) is connected to the correspondence-coded connection pin, for example to a connection pin of a connection field. In this case, the connecting pin and the cable lug can be engaged with each other via corresponding codings, in particular in interlocking engagement. Preferably, by means of the (locking) engagement of cable lug and pin a rotation of the cable lug on the pin causes. The corresponding codes thus act as a (mechanical) locking structure. The corresponding codes may be preferred symbolize or mark a connection type of the connection formed by the connection pin and cable lug. They represent a kind of "speaking coding".

With such an arrangement or such a connection field z. B. an electrical machine or an inverter can be connected. The electric machine and / or the inverter can be such an arrangement or such

Have connection field. This can ensure that the corresponding coding a phase-faulty connection of a cable lug to a not

correspondence-coded pin prevents (especially according to poka-yoke principle).

The present invention further relates to a drive system with a

Electric three-phase system according to the invention. The drive system may be provided in particular for a vehicle, for example a passenger vehicle, a commercial vehicle, a ship or a rail-bound vehicle. The drive system can also be used for a stationary drive, the z. B. is used in a power generation system.

The drive system may preferably have a three-phase electric machine (with the phases U, V, W, for example a synchronous or asynchronous machine) and / or a converter (with the phases U, V, W), preferably one connection per one phase of the

Three-phase machine or the inverter is assigned. This connection is formed by means of a coded connection pin and a correspondence coded cable lug (in particular in the form of a suitably designed arrangement on a three-phase machine or converter). In the context of such a drive system z. B. a three-phase machine and a converter via correspondence coded cable lugs and pins and cables are connected to each other electrically.

Due to the invention, it is advantageously possible to ensure the safety and reliability of an electrical connection to the effect that by means of a lock on the coding twisting of the cable lug when tightening a nut is prevented.

This reduces the possibility of error during assembly. So become the

Example creepage distances reliably adhered to and reversing the direction of rotation of an incorrectly connected to a three-phase electrical machine excluded. Further features and advantages of the invention will become apparent from the following description of exemplary embodiments of the invention, in particular in conjunction with the figures of the drawings.

Preferred embodiments of the invention are explained below with reference to the accompanying drawings. Show it:

1 shows an example and schematically a cable lug according to the prior

Technique in perspective view and in top view.

2 shows an example and schematically a pin according to the prior

Technique in perspective view with a connected

Lug according to FIG. 1.

3 a), b), c) are exemplary and schematic views of exemplary embodiments of FIG

Cable lugs according to the invention with different codes (each in plan view).

Fig. 4 a), b), c) are exemplary and schematic views of embodiments of

Terminal pins according to the invention with different codes (each in plan view of an end).

5 shows an exemplary and schematic illustration of the cable lug according to FIG.

3a), which is connected to the pin of Fig. 4a) (in plan view).

6 shows an exemplary and schematic illustration of an embodiment of a drive system according to the invention with an exemplary embodiment of an electric three-phase system according to the invention.

In the following description and the drawings, the same reference numerals correspond to elements of the same or comparable function.

3a), b), c) each show a cable lug 1, which has a connecting ring 3 for connecting the cable lug 1 to a connecting pin 7, in particular a threaded pin, having. The connecting ring 3 is formed annular disk-shaped, in particular as a perforated disc, and has a passage opening 5. A fastening portion 11 protrudes from the connection ring 3 from. The attachment portion 11 forms a mounting end 13 of the cable lug 1. Das

Fastening end 13 is configured, for example, for a crimped connection (with a conductor strand end). The terminal lug 1 is electrically conductive, and the terminal ring 3 and the attachment portion 11 formed integrally therewith and the attachment end 13 are particularly made of metal (for example, stamped from a metal sheet). The cable lug 1 can be referred to as a ring cable lug due to its ring-shaped connection option, the connection ring 3.

The terminal ring 3 of the cable lug 1 is coded on the inside for connection to a pin out on the outside korendetcodierten 7 (see Figures 4a), b), c)). For the inside coding of the connection ring 3, an encoding 15, in this case a coding structure, projects from the inner edge of the connection ring 3 into the passage opening 5 at the edge. The coding 15 is formed by means of an extension or a lug 17 on the connection ring 3. With the coding 15 projecting into the passage opening, a coded cross section (or a coded cross sectional area) of the passage opening 5 is likewise formed.

The codings 15 of the cable lugs 1 according to Figures 3a), 3b) and 3c) are as

phase-design-shaped lugs or extensions 17 formed, which directly refer to the three-phase phases U, V and W of a three-phase electrical system. The codings 15 according to FIGS. 3a), 3b) and 3c) directly denote or symbolize one of the three three-phase phases U, V, W. In the present case this is also referred to as "speaking" coding. The embodiments of the codes 15 themselves characterize the type, type, function, meaning and / or purpose of the terminal, which is or is to be formed with the cable lug 1. Here, the embodiments of the codes 15 themselves refer to which three-phase phases U, V, W and thus at which terminal, which is occupied by the respective three-phase U, V, W, the respective cable lug 1 is to be connected. At the provided for connection of the three-phase phase U lug 1 according to Fig. 3a), the coding 15 is U-shaped or formed as a U-shaped extension 17. At the provided for connection of the three-phase phase V lug 1 according to FIG. 3b), the coding 15 V-shaped or V-shaped extension 17 is formed. At the provided for connection of the three-phase phase W lug 1 of FIG. 3c), the coding 15 W-shaped or as a W-shaped extension 17 is formed. FIGS. 4a), b) and c) each show a connection pin 7 for mounting a connection ring 3 of a cable lug 1. The connection pins 7 are coded on the outside for the respective connection to a connection ring 3 coded on the inside, ie in particular a correspondence-coded connection ring 3 according to one of the figures 3a), b), c).

The outside coding of a respective pin 7 is formed by means of a coding 19, here a coding structure, which extends over a portion of the pin 7, which is provided for connection of the correspondence coded terminal ring 3 thereto (the pin 7 when connecting the cable shoe 1 the

Connecting ring 3 passes through the section). Due to the codings of the pins 7, a coded cross-section (or a coded cross-sectional area) is formed by means of the respective coding 19 (analogous to the connecting rings 3 according to FIG. 3 a), b), c)) on a respective connecting pin 7. These coded cross sections correspond to those coded cross sections which have the passage openings 5 of the correspondence-coded connection rings 3 provided for connection to the connection pins 7.

A respective outside coding 19, in particular outside (axially) formed or extending on the connecting pin, is formed, for example, as a groove-shaped depression or recess 21.

In particular, the respective coding 19 - as the coding 15 of the respective

Connecting ring 3 - "speaking" formed. The configuration of the coding 19 itself refers directly to the intended type, the type, the function, the meaning and / or the purpose of the terminal, which is or is to be formed with the respective pin 7. Here, the embodiments of the codes 19 themselves refer directly to which three-phase phase U, V, W, the respective pin 7 is assigned or which three-phase phase U, V, W is assigned to the terminal, which is formed or formed with the respective pin 7.

To each of the coding 19 of a respective pin 7 according to the figures 4a), 4b) and 4c) one of three electrical phases U, V, W to designate or speak to

symbolize, therefore, to refer to which of the three electrical phases U, V, W via the respective pin 7 (and the correspondence coded connection ring 3)

is to be connected, the respective codes 19 are formed as phase-like recesses 21. The depressions 21 refer directly to the Three-phase phases U, V and W of a three-phase electrical system. The codings 19 according to FIGS. 4 a), b) and c) directly designate or symbolize one of the three three-phase phases U, V, W. At the connection pin 7 according to FIG. 4 a) provided for connection of the three-phase phase U, the coding is 19 U förmigoder formed as a U-shaped recess 21. At the provided for connection of the three-phase phase V pin 7 according to Fig. 4b), the coding 19 V-shaped or formed as a V-shaped recess 21. At the provided for connection of the phase W pin 7 according to Fig. 4c), the coding 19 W-shaped or as a W-shaped recess 21 is formed.

In the case of the correspondence codings shown, the outside coding 19, hence the coded cross section of the connecting pin 7 according to FIG. 4 a), corresponds to the inside one

Coding 15, thus the coded cross-section of the through hole 5 of the connecting ring 3 of Fig. 3a). The outside coding 19, hence the coded cross section of the

Pin 7 according to Fig. 4b), corresponds to the inside coding 15, thus the coded cross-section of the Durchgangsöffhung 5 of the connection ring 3 of FIG. 3b). The outside coding 19, hence the coded cross section of the connecting pin 7 according to FIG. 4c), corresponds to the inside coding 15, thus to the coded cross section of the through opening 5 of the connecting ring 3 according to FIG. 3c).

With the differently coded pins 7 according to FIGS. 4 a), b) and c), a connection field 9 (FIG. 4) for the connection of three three-phase phases U, V, W can be formed in a simple manner. The connection pins 7 of the connection field 9 are coded differently for the connection of a respective correspondence-coded connection ring 3 or a respective assigned phase U, V or W. A risk of confusion of the phase when connecting one of the pins 7 is thus considerably minimized by the respective coding 19. It should also be noted that the coding ensures that a terminal ring 3 of the U-, V- or W-coded terminal rings 3 is not encoded to a non-correspondence-coded one

Pin 7 of the U, V or W-coded pins 7 can be connected. For this purpose, the codings 15 on the connecting rings 3 and the codings 19 on the connecting pins 7 (by suitable shaping) are designed so that incompatible or non-corresponding coded cross sections of the connecting rings 3 and pins 7 by (mechanical) blocking the passage of the pin through the Through hole 5 of the terminal ring 3 to prevent the connection of the terminal ring 3 on the pin 7. FIG. 5 shows, by way of example, an arrangement 23 which has a cable lug 1 which is connected to a correspondence-coded connecting pin 7, for example a connecting field 9. By way of example, the cable lug 1 is a cable lug 1 according to Fig. 3a) with a U-shaped

Coding 15 and the correspondence coded pin 7 such as in FIG. 4a) with a corresponding U-shaped coding 19. Lug 1 and pin 7 of FIG. 5 form an electrical connection, for example an inverter or an electric machine, for connecting the Three-phase phase U.

In the context of the arrangement 23, the connecting pin 7 and the cable lug 1 are over

corresponding codes engage each other, in particular in (mechanical) locking engagement. The corresponding codes, by means of which by means of engagement with each other and a rotation of the cable lug 1 on the pin 7, thus ensuring a predetermined relative orientation is so far formed by means of the inside coding 15 of the terminal ring 3 of the cable lug 1 and the outside code 19 of the pin 7.

6 shows a schematic representation of a three-phase electrical system 25. The three-phase electrical system 25 contains the arrangement 23 according to FIG. 5 with the U-shaped coding 15, 19. Furthermore, the three-phase electrical system 25 has a second arrangement 23 with V-shaped coding 15 , 19 and a third arrangement 23 with W-shaped coding 15, 19. The second of the arrangements 23 has a cable lug 1 according to FIG. 3b) with a V-shaped coding 15 and a correspondence-coded connecting pin 7 according to FIG. 4b)

corresponding V-shaped coding 19. The third of the arrangements 23 has a cable lug 1 according to FIG. 3c) with W-shaped coding 15 and a correspondence-coded connecting pin 7 according to FIG. 4c) with corresponding W-shaped coding 19. The three-phase electrical system 25 thus has the connection field 9 (FIG. 4) for the connection of the three three-phase phases U, V, W, wherein in each case a cable lug 1 provided with a corresponding coding 15 is connected to the three connection pins of the connection field 9.

The three-phase electrical system 25 is part of a drive system 27. The drive system 27 further comprises a rotary electric machine 29, which via the electrical

Three-phase system 25 is connected to a converter 31. The three three-phase connections, via which the three-phase machine 29 is connected to the converter 31, are designed according to the arrangement 23 of the three-phase electrical system 25. There are three arrangements 23 with Lugs 1 with U, V and W-shaped codings 15 and pins 7 with corresponding codes 19 available. The drive system 27 may be for driving a vehicle. The electric rotary machine 29 can be operated by a motor in this case. The drive system 27 may be part of a hybrid drive of such a vehicle, for example. The drive system 27 may alternatively be part of a stationary one

Be energy generation system. The electric rotary machine 29 can be operated as a generator in this case. In particular, the power generation system can be part of a power supply network into which it can feed energy. The energy supply network can be in particular a so-called microgrid or smartgrid.

Claims

1. Lug (1) with a connecting ring (3) for connecting the cable lug (1) to a connecting pin (7), wherein on an inner side (14) of the connecting ring (3) has a coding (15) is formed, which with a an outside (18) of the connecting pin (7) formed coding (19) corresponds.

2. Lug according to claim 1, characterized in that the coding (15) on the inside (14) of the connecting ring (3) is externally designed so that it directly characterizes a connection with the cable lug (1).

3. Cable lug according to claim 1 or 2, characterized in that the coding (15) on the inside (14) of the connecting ring (3) is designed so that it the type, the type, the function, the meaning and / or the Purpose of the connection with the cable lug (1).

4. Cable lug according to one of claims 1 to 3, characterized in that the coding (15) on the inner side (14) of the connecting ring (3) is designed so that it on a

Three-phase phase (U, V, W) refers to a three-phase electrical system, which is associated with the connection with the cable lug (1).

5. Lug according to claim 4, characterized in that the coding (15) on the inside (14) of the connection ring (3) is U-shaped, V-shaped or W-shaped.

6. connecting pin (7) for connecting a connection ring (3) of a cable lug (1), wherein on an outer side (18) of the connecting pin (7) has a coding (19) is formed, with one on an inner side (14) of the connecting ring (3) formed coding (15) corresponds.

7. pin according to claim 6, characterized in that the coding (19) on the outer side (18) of the connecting pin (7) is externally designed so that it directly characterizes a connection with the pin (7).

8. Pin according to claim 6 or 7, characterized in that the coding (19) on the outer side (18) of the connecting pin (7) is designed so that it is the type, the type Function, the meaning and / or purpose of the connection with the pin (7).

9. pin according to one of claims 6 to 8, characterized in that the coding (19) on the outer side (18) of the connecting pin (7) is designed so that it is on a

Three-phase phase (U, V, W) refers to a three-phase electrical system, which is assigned to the connection with the pin (7).

10. Connecting pin according to claim 9, characterized in that the coding (19) on the outer side (18) of the connecting pin (7) is U-shaped, V-shaped or W-shaped.

11. Electrical three-phase system (25) with three terminals for three three-phase phases (U, V, W), wherein the terminals, each with a cable lug (1) according to one of claims 1 to 5 and / or each with a pin (7) after a of claims 6 to 10 are formed.

12. Drive system (27) with a three-phase electrical system (25) according to claim 11.