STATOR FOR AN ELECTRIC MACHINE

Abstract

A stator for an electric machine is provided having a winding with plurality of interconnected conductors assigned to one or more phases. The ends of at least some of the conductors protrude axially or radially beyond the winding at the inner circumference or at the outer circumference of the winding, wherein an interconnection ring, to which the conductors are connected, is positioned axially or radially on the winding. The ends of in each case at least two conductors assigned to one phase protrude radially or axially outwards and are connected to a power connection arranged radially outside the winding.

Claims

1. A stator for an electric machine, comprising: a winding comprising a plurality of interconnected conductors assigned to one or more phases, wherein ends of at least one of the conductors protrude axially or radially beyond the winding at an inner circumference or at an outer circumference of the winding, wherein an interconnection ring, to which the conductors are connected, is positioned axially or radially on the winding, and wherein the ends of in each case at least two conductors assigned to one phase protrude radially or axially outwards and are connected to a power connection arranged radially outside the winding.

2. The stator according to claim 1, wherein the interconnection ring has a plurality of separate line bridges to which the ends are connected.

3. The stator according to claim 2, wherein the line bridges have radially or axially protruding connection sections to which the ends are connected.

4. The stator according to claim 2, wherein the line bridges are arranged radially and axially offset from one another.

5. The stator according to claim 3, wherein the interconnection ring has a housing in which the line bridges are arranged.

6. The stator according to claim 5, wherein the housing has openings through which the connection sections protrude.

7. The stator according to claim 1, wherein the radially or axially outwardly guided ends of a conductor arranged on the inner circumference overlap the interconnection ring.

8. The stator according to claim 1, wherein the power connection comprises a number of busbars corresponding to the number of phases.

9. The stator according to claim 8, wherein the busbars are accommodated in a housing.

10. An electric machine, comprising a stator according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure is explained below on the basis of exemplary embodiments with reference to the drawings. The drawings are schematic representations, wherein:

[0018] FIG. 1 shows a schematic diagram in the form of a partial view of a stator according to the disclosure,

[0019] FIG. 2 shows a partial view of the interconnection ring,

[0020] FIG. 3 shows a schematic diagram of various line bridges of the interconnection ring from FIG. 2, and

[0021] FIG. 4 shows a partial view of the power connection.

DETAILED DESCRIPTION

[0022] FIG. 1 shows, in the form of a partial view, a schematic illustration of a stator 1 according to the disclosure of an electric machine, having a winding 2 comprising a plurality of conductors 3, which are assigned to three separate phases in the example shown. Each conductor 3 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 2, which can also be referred to as a winding cage. The plurality of conductors 3 define different radial planes R, as shown in FIG. 1. For this purpose, the conductors 3 extend, depending on the winding diagram, 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.

[0023] The conductors are guided or bent and laid in such a way that corresponding recesses 4 result, which extend radially so that corresponding stator teeth 5 engage in these recesses 4 or the corresponding conductors are wound between the corresponding grooves of the stator teeth 5. The basic structure of such a stator or a winding 2 wound from the separate brackets described is basically known.

[0024] In the stator 1 according to the disclosure, the ends 6 of the conductors 3, insofar as the ends 6 terminate respectively at the inner circumference and the outer circumference of the annular winding 2, are axially protruding, i.e., they protrude axially from the winding 2. These ends are associated with individual conductors, which in turn are assigned to different phases, which is why the conductor ends must be connected according to the routing diagram of the conductor 3. For this purpose, an interconnection ring 7 is used, which is placed axially on the end face of the winding 2 and is arranged between the conductor ends 6 or engages therebetween. The interconnection ring 7 comprises, as will be discussed below, a plurality of corresponding line bridges and connection sections 8, which protrude to the side from the housing 9 of the interconnection ring 7 and are positioned precisely next 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 by simple welding so that all conductors 3 are correctly and phase-specifically interconnected when they are connected.

[0025] Furthermore, a power supply 14 is provided, which is arranged radially next to the winding 2 in the region of its axial end. This power supply 14, also referred to as a HV terminal, comprises a housing 10, in which corresponding busbars 11 are arranged, which protrude with their connection terminals 12 from the housing.

[0026] In the present case, as described, a 3-phase stator is shown, which is why three such connection terminals 12 are also provided in the example shown.

[0027] Each connection terminal 12 is to be connected to one phase of the winding 2. This is implemented in a simple manner in that two conductor ends 6a per phase are guided or bent radially outwards, as FIG. 1 clearly shows. The two conductor ends 6a arranged on the outer circumference of the winding 2 are relatively short and can be bent directly outwards, while the two conductor ends 6a arranged on the inner circumference are longer and overlap the interconnection ring 7. They run above the connection terminals 12 so that a simple welded connection for making contact is possible there as well. The connection to the power supply 14 does not take place until the conductors 3 are interconnected via the interconnection ring 7.

[0028] FIG. 2 shows a partial view of the interconnection ring 7 according to FIG. 1. The housing 9 is shown, which is accordingly in several parts and also enables radial encapsulation. It can be seen that the corresponding connection sections 8, which are assigned to different phases, protrude from the housing 9 through corresponding openings. As already described, the individual connection sections are assigned to different phases, i.e., connect different conductor ends 6.

[0029] To implement the connection section 8, see FIG. 3, a corresponding plurality of—seven in the example shown—separate line bridges 13 are arranged in the interior of the housing 9, which are arranged axially and radially offset from one another. On the respective inner or outer circumference of the line bridges 13, the corresponding connection sections 8 are formed, which in their entirety form a corresponding star distributor. Corresponding conductor ends arranged offset in the circumferential direction can accordingly be connected accordingly on the inner and outer circumference via the line bridges 13 extending in the circumferential direction so that the corresponding meander structure of the individual phase conductors is formed in this way.

[0030] Like the conductors 3, of course, the line bridges 13 are also appropriately insulated or provided with an insulation coating or the like.

[0031] Finally, FIG. 4 shows, in an enlarged partial view, the power supply 14, i.e., the HV terminal, with its housing 10, which is also formed from several parts here and completely encapsulates the busbars 11. It is designed to be slightly curved so that it can be placed on the side of the stator to suit its shape. Each busbar 11 or each connection terminal 12 is assigned to a corresponding phase, wherein these phases are usually referred to as U, V and W. Like the housing 9 of the interconnection ring 7, the housing 10 of the power connection 14 also has corresponding openings through which the individual connections protrude.

[0032] While the conductor ends protrude axially on the inner and outer circumference in the embodiment shown, it is conceivable to provide conductor ends protruding axially only on the inner or only on the outer circumference. Furthermore, the conductor ends can also protrude radially and be connected to the axially arranged interconnection ring. The interconnection ring can also be attached radially and contacted with the axially or radially protruding conductor ends. Various configurations are therefore possible both with regard to the conductor routing and the positioning of the interconnection ring.

[0033] The connection section 8 of the line bridges can finally also protrude axially from the housing 9; an axial and radial arrangement is also conceivable, depending on the configuration of the guidance and positioning of the conductor ends.

LIST OF REFERENCE NUMBERS

[0034] 1 Stator

[0035] 2 Winding

[0036] 3 Conductor

[0037] 4 Recess

[0038] 5 Stator tooth

[0039] 6 Conductor end

[0040] 6a Conductor end

[0041] 7 Interconnection ring

[0042] 8 Connection section

[0043] 9 Housing

[0044] 10 Housing

[0045] 11 Busbar

[0046] 12 Connection terminal

[0047] 13 Line bridge

[0048] 14 Power connection