CONTACT DEVICE FOR A STATOR, STATOR AND ELECTRIC MACHINE

Abstract

A contact device for a stator of an electric machine. The contact device has an electrically insulating contact carrier and an upper side positioned to face away from the stator. Electrically conductive connection conductors for contacting a plurality of coils are arranged over the circumference of the stator via coil conductors. The contact device has feedthrough openings, through which the coil conductors are guided such that at least one coil conductor is connected to a connection conductor. The contact carrier has fixing devices at the feedthrough openings designed so that at least one coil conductor touches a connection conductor at a contact surface. The coil conductor at this contact surface applies a permanent force action to the connection conductor perpendicularly to the respective conductor axis. Parallel-lying portions of the coil conductor and the connection conductor are pressed against each other at the common contact surface.

Claims

1. A contact device for a stator of an electric machine, wherein the contact device has a contact carrier made from an electrically insulating material, an upper side, which can be positioned to face away from the stator, and, at least on the upper side which can be positioned to face away from the stator, electrically conductive connection conductors for contacting a plurality of coils, arranged over the circumference of the stator, via coil conductors, wherein the contact device furthermore has feedthrough openings, through which the coil conductors of the coils can be guided such that at least one coil conductor can be connected to a connection conductor, wherein the contact carrier has fixing devices at the feedthrough openings, which fixing devices are designed in such a way that at least one coil conductor touches a connection conductor at a contact surface and the coil conductor, at this contact surface, applies a permanent force action to the connection conductor via forces acting perpendicularly to the respective conductor axis, whereby mutually parallel-lying portions of the coil conductor and the connection conductor are pressed against each other at the common contact surface.

2. The contact device according to claim 1, wherein the fixing devices are designed in such a way that these fixing devices arrest the coil conductors with respect to an axial movement, at least in one direction.

3. The contact device according to claim 1, wherein the fixing device is formed by holding lugs.

4. The contact device according to claim 3, wherein a plurality of holding lugs are arranged in at least one feedthrough opening.

5. The contact device according to claim 3, wherein the holding lugs form a form-fitting connection with the coil conductor.

6. The contact device according to claim 3, wherein the holding lugs form a material-fitting connection with the coil conductor.

7. The contact device according to claim 1, wherein the fixing device is arranged at the output-side end of the feedthrough opening in the insertion direction of the coil conductors.

8. The contact device according to claim 1, wherein the feedthrough openings taper conically in the insertion direction of the coil conductors.

9. A stator of an electric machine having a contact device according to claim 1.

10. An electric machine having a stator according to claim 9.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Exemplary embodiments of the invention are explained in more detail with reference to the schematic drawings, in which:

[0030] FIG. 1 shows a schematic view of a stator of an electric machine with a contact device seated on the end face,

[0031] FIG. 2 shows a detailed view of a contact device in the region of a contact point of a coil conductor with a connection conductor,

[0032] FIG. 3 shows a plan view of a segment of a contact device,

[0033] FIG. 4 shows a cross-section along the line A-A of FIG. 3,

[0034] FIG. 5 shows a cross-section of a segment of a contact device, and

[0035] FIG. 6 shows a detailed view of the fixing device of FIG. 5.

[0036] Mutually corresponding parts are denoted by the same reference signs in all figures.

DETAILED DESCRIPTION

[0037] In FIG. 1, a stator 2 with a contact device 1 seated on the end face is illustrated schematically. The connection contacts arranged on the upper side of a contact carrier 4 are assembled in a connector, which is to be connected to the electrical connection. This contact device 1 is illustrated as a partial detail in FIG. 2.

[0038] FIG. 2 shows a schematic detailed view of a contact device 1 in the region of a contact point of a coil conductor 31 with a connection conductor 41. The coil 3 is not illustrated in more detail in FIG. 2, but is arranged in the direction of the arrow. The coil conductor 31 and the connection conductor 41 have a rectangular cross-section perpendicularly to their respective conductor axis. As a result of the rectangular cross-sections, the coil conductors 31 and the connection conductors 41 touch each other at a common contact surface 7. The end of the coil conductor 31 passes through a feedthrough opening in the contact carrier 4. A fixing device 6 with holding lugs 61 is formed at the output-side end of the feedthrough opening. In this case, there are four elastically deformable holding lugs 61, which each lie against a surface of the rectangular coil conductor 31. These holding lugs 61 narrow the cross-section in such a way that the fixing device 6 acts on the respective coil conductors 31 in the manner of a gripping mechanism. In this case, the holding lugs 61 are also made from the same material as the contact carrier 4.

[0039] During the assembly of the coil conductors 31, these are pushed through the narrow point specified by the fixing device 6 and the holding lugs 61 are thereby pre-tensioned, as it were. This produces a force action by means of which the coil conductors 31 apply a permanent force action to the connection conductors 41 at the common contact surface 7. The coil conductors 31 and the connection conductors 41 are already connected in an electrically conductive manner as a result of the contact-pressure force and are moreover joined with material fit, for example via soldered or welded connections, at least in segments or over the entire common contact surface 7. The contact-pressure force between the coil conductor 31 and the connection conductor 41 can also serve to generate a reliable electrical contact in the case of plug-in contacts.

[0040] FIG. 3 shows a plan view of a segment of a contact device 1. A cross-section along the line A-A of FIG. 3 is illustrated in FIG. 4. The coil conductor 31 and the connection conductor 41 touch each other at a common contact surface 7. A joining connection can be realized at this contact surface 7. The end of the coil conductor 31 passes through a feedthrough opening 5 in the contact carrier 4. The feedthrough opening 5 has a larger opening width at the input-side end 9 than at the output-side end 8 and therefore tapers conically in the insertion direction of the coil conductor 31. As a result of a conical form of the feedthrough opening 5, the conductor end of a coil conductor 31 can be introduced through the feedthrough opening 5 more easily, wherein, during the installation, the conductor end is guided into the fixing device 6 through the tapering conical extent to the output-side end 8. The fixing device 6 is arranged with its holding lugs 61 directly at the output-side end 8. The conductor end of the respective coil conductor 31 is thus specifically guided through the fixing device 6 until it is positioned on the connection conductor 41.

[0041] FIG. 5 shows a cross-section of a segment of a contact device 1. A detailed view of the fixing device 6 of FIG. 5 is illustrated in FIG. 6. The holding lugs 61 of the fixing device 6, which are arranged at the output-side end 8, are elastically deformed in the insertion direction by the pushed-through coil conductor 31 and pre-tensioned. These upwardly bent holding lugs 61 counteract a reverse movement of the respective conductor end of the coil conductor 31. The elastic behavior of the narrow point already results in the fixing action before the associated connection conductor 41 is connected to the coil conductor 31 with material fit by means of a welded or soldered connection.

LIST OF REFERENCE SIGNS

[0042] 1 Contact device

2 Stator

3 Coil

[0043] 31 Coil conductor
4 Contact carrier
41 Connection conductor
5 Feedthrough opening
6 Fixing device

61 Holding lug

[0044] 7 Contact surface

8 Output-side end

9 Input-side end