ELECTRIC MACHINE

Abstract

An electric machine including a stator (2) with a winding (3) having a plurality of conductors (4) associated with one or more phases and interconnected with each other, the ends (6) of at least two conductors (4) are associated with a phase projecting axially or radially from the winding (3) at the inner circumference and/or the outer circumference of the winding (3) and a connected to a power connection (9) that is mounted radially outside the winding (3) by a common connecting conductor (12a).

Claims

1. An electric machine, comprising: a stator having a winding comprising a plurality of conductors assigned to one or more phases, which are interconnected with each other; and ends of at least two of the conductors associated with one of the phases project axially or radially from the winding at at least one of an inner circumference or an outer circumference of the winding, and are connected to a power connection arranged radially outside the winding by a common connecting conductor.

2. The electric machine according to claim 1, wherein connecting conductor has a contact section with which the connecting conductor contacts on two opposite sides at both of the conductor ends.

3. The electric machine according to claim 2, wherein the connecting conductor has a contact section which is U-shaped for contact on both of the opposite sides of the conductor ends.

4. The electric machine according to claim 3, wherein the contact section has a U-shaped receptacle which encompasses both of the conductor ends.

5. The electric machine according to claim 3, wherein the contact section has two U-shaped receptacles which each encompass one of the conductor ends.

6. The electric machine according to claim 2, wherein any one of the claims, characterized in that the contact section is wider than an actual conductor width.

7. The electric machine according to claim 1, wherein a plurality of contact elements corresponding to a number of phases are provided on the power connection, which said contact elements have a base and at least two fingers protruding therefrom.

8. The electric machine according to claim 1, wherein the conductor ends of at least some of the conductors project beyond the winding, some of the conductor ends are connected axially to an interconnection ring set on the winding, and the connecting conductors are fixed to at least one holding element provided on the interconnection ring.

9. The electric machine according to claim 8, wherein the interconnection ring has a housing in which the one or more holding elements are arranged.

10. The electric machine according to claim 9, wherein one or each at least one of the holding elements is configured as a latching or clamping element, on which one or more of the connecting conductors are fixed via a latching or clamping connection.

11. The electric machine according to claim 1, wherein the connecting conductor has a contact section with which the connecting conductor only contacts on one side of the two conductor ends.

12. An electric machine, comprising: a stator having a winding comprising a plurality of conductors assigned to one or more phases, which are interconnected with each other; and ends of at least two of the conductors associated with one of the phases project from the winding at at least one of an inner circumference or an outer circumference of the winding, and are connected to a power connection arranged outside the winding by a common connecting conductor.

13. The electric machine according to claim 12, wherein the connecting conductor has a contact section with which the connecting conductor contacts on two opposite sides at both of the conductor ends.

14. The electric machine according to claim 13, wherein the connecting conductor has a contact section which is U-shaped for contact on both of the opposite sides of the conductor ends.

15. The electric machine according to claim 13, wherein the contact section has a U-shaped receptacle which encompasses both of the conductor ends.

16. The electric machine according to claim 13, wherein the contact section has two U-shaped receptacles which each encompass one of the conductor ends.

17. The electric machine according to claim 12, wherein a plurality of contact elements corresponding to a number of phases are provided on the power connection, said contact elements have a base and at least two fingers protruding therefrom.

18. The electric machine according to claim 12, wherein the conductor ends of at least some of the conductors project beyond the winding, some of the conductor ends are connected axially to an interconnection ring set on the winding, and the connecting conductors are fixed to at least one holding element provided on the interconnection ring.

19. The electric machine according to claim 18, wherein the interconnection ring has a housing in which the one or more holding elements are arranged.

20. The electric machine according to claim 19, wherein at least one of the holding elements is configured as a latch or clamp, on which one or more of the connecting conductors are fixed via latching or clamping.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The disclosure is explained below on the basis of exemplary embodiments with reference to the drawings. The drawings are schematic representations, wherein:

[0023] FIG. 1 shows a partial view of an electric machine according to the disclosure having a connecting conductor in a first embodiment,

[0024] FIG. 2 shows a view corresponding to FIG. 1 having a connecting conductor of a second embodiment,

[0025] FIG. 3 shows a further partial view having a connecting conductor of a third embodiment,

[0026] FIG. 4 shows a partial view having a connecting conductor of a fourth embodiment,

[0027] FIG. 5 shows a detailed view of the area of the contact elements of the power connection without connected connecting conductors, and

[0028] FIG. 6 shows the arrangement from FIG. 5 having connected connecting conductors.

DETAILED DESCRIPTION

[0029] FIG. 1 shows, in the form of a partial view, a schematic diagram of an electric machine 1 according to the disclosure, comprising a stator 2 having a winding 3 comprising a plurality of conductors 4, which are assigned to three separate phases in the example shown. More or fewer phases can also be provided. Each conductor 4 is designed almost like a U-shaped bracket, wherein a plurality of such U-shaped conductors, often also called hairpins, are plugged together to form the winding 3, which can also be referred to as a winding cage. The plurality of conductors 4 define different radial planes R, as shown in FIG. 1. For this purpose, depending on the winding diagram, the conductors 4 extend from one radial plane to another radial plane, for example an adjacent radial plane, in the region in which they are connected to the conductor ends of corresponding adjacent conductors continuing the phase conductor.

[0030] The conductors 4 are guided or bent and laid in such a way that corresponding recesses result, which extend radially so that corresponding stator teeth 5 engage in these recesses or the corresponding conductors 4 are wound between the corresponding grooves of the stator teeth 5. The basic structure of such a stator or such an electric machine, and such a winding 3 wound from the separate brackets described is basically known.

[0031] In the stator 2 according to the disclosure, the ends 6 of the conductors 4, insofar as the ends 6 terminate respectively at the inner circumference and/or the outer circumference of the annular winding 3, are axially salient, i.e., they stick out axially from the winding 3. These ends 6 are associated with individual conductors 4, which in turn are associated with different phases, which is why the conductor ends 6 must be connected according to the routing diagram for the conductor 4. For this purpose, an interconnection ring 7 is used, which is placed axially on the end face of the winding 3 and is arranged between the conductor ends 6 or engages therebetween. The interconnection ring 7 comprises a number of corresponding conductor bridges and connection sections, not shown in more detail, which project to the side from the housing 8 and are positioned precisely adjacent to the corresponding conductor end 6 after the interconnection ring 7 has been inserted between the conductor ends 6 with which they are to be connected. The connection is made, e.g., by simple welding so that when they are connected, all conductors 4 are interconnected correctly and in a phase-specific manner. Other connection methods are also conceivable.

[0032] Furthermore, a power supply 9 is provided, which is arranged to be radially adjacent to the winding 3 in the region of the axial end thereof, i.e., of the winding head. This power connection 9, also referred to as an HV terminal, comprises a housing 10, in which corresponding busbars are arranged, which protrude with their contact elements 11, i.e., connection terminals (see FIG. 5) thereof protrude from the housing 10.

[0033] To connect these contact elements 11 to the corresponding, phase-specific conductor ends 6, connecting conductors 12 are provided, wherein FIG. 1 shows on the one hand a connecting conductor 12a according to the disclosure, which serves to connect two conductor ends 6 assigned to the same phase with a contact element 11, and two separate, individual connecting conductors 12b which each connect a conductor end 6 to a common contact element 11 as before.

[0034] The connecting conductor 12 has a laterally or circumferentially widened contact section 13 which, coming from the radially outer side, lies against the two conductor ends 6 to which it is to be welded. It therefore contacts two conductor ends 6 at the same time. The conductor width thereof or the conductor cross-section thereof corresponds to at least twice a conductor width or a conductor cross-section of the conductor 4 or the conductor ends 6. It then runs from the contact point to the conductor ends 6, then to a contact element 11 on the power connection 9, where it also lies flat and is welded thereonto.

[0035] As FIG. 1 clearly shows, with a wide connecting conductor 12a according to the disclosure, the simultaneous contacting of two (or more) conductor ends 6 and the connection thereof to a common contact element 11 is possible, while likewise, as also shown in FIG. 1, instead of such a wide connecting conductor 12a, narrow connecting conductors 12b would each need to be contacted with a conductor end 6. The assembly and laying effort is significantly reduced, as is the number of components to be used.

[0036] While in the embodiment according to FIG. 1 the contact section 13 is positioned in a quasi L-shape relative to the connecting conductor 12a, FIG. 2 shows a T-shape of the contact section 13 or the connecting conductor 12a in the connection area to the two conductor ends 6. Here, too, there is a radially outer contact between the contact section 13 and the conductor ends 6.

[0037] As an alternative thereto, FIG. 3 shows an embodiment in which the contact section 13 of the wide connecting conductor 12a according to the disclosure is designed as a U-shaped bracket 14, which can be seen to encompass the two (or more) conductor ends 6, which are consequently in contact and connected with the contact section 13 on both sides. This ensures an even more secure connection with an even higher current-carrying capacity.

[0038] While the contact section 13 has only one U-shaped bracket in the embodiment according to FIG. 3, FIG. 4 shows an embodiment in which the contact section 13 has two U-shaped brackets 14, each of which encompasses a conductor end 6 and also rests on both sides thereof. Here, too, as in all other configurations, the connection is made by welding.

[0039] The configuration according to FIG. 3 is comparable to that from FIG. 1, i.e., it also has an L-shaped side view but with a U-shaped bracket design, while the configuration according to FIG. 4 corresponds to the T-shaped arrangement from FIG. 2, although also with a U-shaped bracket design.

[0040] As already described, FIG. 5 shows the three contact elements 11 of the power connection 9. Each contact element 11 is assigned to a phase and has a wide base 15 from which two fingers 16 protrude. Such a contact element 13 enables the arrangement of both a wide connecting conductor 12a according to the disclosure and individual narrow connecting conductors 12b, as shown in FIG. 6. The wide connecting conductor 12a has a wide contact area 17 corresponding to the conductor cross-section thereof, which rests on the wide base 15 over a large area. The welding takes place there.

[0041] The narrow connecting conductors 12b, on the other hand, (also) extend along the fingers 16 and are welded thereonto. This means that such a contact element 13 enables both the wide and the narrow connecting conductors to be fixed.

[0042] Returning to FIG. 1, also shown is a holding element 18 molded onto the housing 8 made of plastic, which is designed as a latching or clamping element 19 and has two latching or clamping arms 20 which are slightly resilient. In the example shown, the two connecting conductors 12b are inserted and snapped into these latching or clamping elements 19, so they are fixed there in a fixed position and pressed against the opposite leg by means of the fingers 20, so that on the one hand they are fixed, but on the other hand a sufficient mobility is still given to compensate for any vibrations. The holding element 18, of which several can be provided along the housing 8, is formed in one piece or integrally with the housing 8, that is to say also made of plastic, so that it is a multifunctional component. During assembly, only the connecting conductors need to be inserted and fixed.

[0043] Instead of the two connecting conductors 12b shown in the figures, there is of course also the option of laying a single, correspondingly wider connecting conductor 12a here as well. Such a wide connecting conductor 12a can also be fixed in the holding element 18. FIG. 1 only serves to show that, in principle, there is also the possibility, according to the disclosure, of laying wide, multiple conductor ends 6 contacting connecting conductors 12a together with conventional, narrow connecting conductors 12b. Of course, primarily or exclusively correspondingly wide connecting conductors 12a, regardless of the geometry thereof, are preferably used, particularly in the contact section 13, combined with a simplification of assembly and conductor routing, a reduction in the number of components required, and a greater compactness of the electric machine.

LIST OF REFERENCE SYMBOLS

[0044] 1 Electric machine

[0045] 2 Stator

[0046] 3 Winding

[0047] 4 Conductor

[0048] 5 Stator tooth

[0049] 6 End

[0050] 7 Interconnection ring

[0051] 8 Housing

[0052] 9 Power supply

[0053] 10 Housing

[0054] 11 Contact element

[0055] 12 Connecting conductors

[0056] 12a Connecting conductor

[0057] 12b Connecting conductor

[0058] 13 Contact section

[0059] 14 U-shaped bracket

[0060] 15 Base

[0061] 16 Finger

[0062] 17 Contact Area

[0063] 18 Holding element

[0064] 19 Latching or clamping element

[0065] 20 Finger

[0066] R Radial plane