CARRIER FOR COILS OF AN ELECTRIC MACHINE

Abstract

A carrier for coils of an electric machine includes a rotation-symmetrical carrier stack having laminations with axial slots which are configured to receive a wire of the coils. Adjacent ones of the slots are separated from one another by a slot wall. The carrier stack has circular end faces and is formed with slot openings for the slots. Electrically insulating material is applied upon at least the slot walls of at least one of the end faces to cover the slot walls at their end face and to electrically insulate the slot walls.

Claims

1. A carrier for coils of an electric machine, said carrier comprising: a rotation-symmetrical carrier stack including laminations having axial slots which are configured to receive a wire of the coils, with adjacent ones of the slots being separated from one another by a slot wall, said carrier stack having circular end faces and formed with slot openings for the slots; and electrically insulating material applied at least upon the slot walls of at least one of the end faces to cover the slot walls at their end face and to electrically insulate the slot walls.

2. The carrier of claim 1, wherein the electrically insulating material is arranged on the at least one of the end faces to completely cover and electrically insulate the at least one of the end faces.

3. The carrier of claim 2, wherein the electrically insulating material is shaped to correspond to a shape of the at least one of the end faces.

4. The carrier of claim 1, wherein the electrically insulating material is embodied as insulation paper.

5. The carrier of claim 1, wherein the electrically insulating material is applied on an inner wall of each of the slots to cover and electrically insulate the inner wall.

6. The carrier of claim 1, wherein the electrically insulating material is applied on the at least one of the end faces such that wire extending on the at least of the end faces outside of the slots between a first one of the slots and a second one of the slots is arranged on the electrically insulating material, with the wire forming part of a winding head.

7. The carrier of claim 1, constructed in the form of a stator or a rotor.

8. The carrier of claim 1, wherein the electrically insulating material is thermally conductive.

9. A method of making a carrier for coils of an electric machine, comprising: forming a rotation-symmetrical carrier stack with circular end faces by stacking a plurality of laminations having axial slots which are separated by slot walls and provided for receiving a wire of coils; and applying electrically insulating material at least upon the slot walls of at least one of the end faces to cover and electrically insulate the slot walls.

10. The method of claim 9, further comprising shaping the electrically insulating material to correspond to a shape of the at least one of the end faces.

11. The method of claim 9, wherein the electrically insulating material is bonded onto the at least one of the end faces.

12. The method of claim 9, further comprising applying electrically insulating material upon an inner wall of each of the slots.

13. The method of claim 9, wherein the electrically insulating material is applied on the at least one of the end faces such that wire extending on the at least of the end faces outside the slots between a first one of the slots and a second one of the slots is arranged on the electrically insulating material, with the wire forming part of a winding head.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0024] Other features and advantages of the present invention will be more readily apparent upon reading the following description of currently preferred exemplified embodiments of the invention with reference to the accompanying drawing, in which:

[0025] FIG. 1 is a schematic perspective view of a carrier stack as part of a carrier according to the present invention;

[0026] FIG. 2 is a plan view upon the carrier of FIG. 1; and

[0027] FIG. 3 is a sectional view of the carrier of FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0028] Throughout all the figures, same or corresponding elements may generally be indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the figures are not necessarily to scale and that the embodiments may be illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted.

[0029] Turning now to the drawing, and in particular to FIG. 1, there is shown a schematic perspective view of a carrier stack, generally designated by reference numeral 2 and having a rotation-symmetrical configuration, e.g. hollow-cylindrical configuration. The carrier stack 2 is a component of a carrier according to the present invention, as shown in FIG. 3 and generally designated in FIG. 3 by reference numeral 4. The carrier 4 can be used as a stator or rotor for an electric machine. The carrier stack 2 is comprised of a plurality of laminations which are stacked to form the carrier stack 2. Slots 6 with slot apertures 8 are formed on an inner wall of the carrier stack 2, with two directly adjacent slots 6 being separated from one another and/or connected to one another, depending on definition, by a slot wall 10. The carrier stack 2 has an upper end face 12 and a lower end face 14 which are both of circular configuration and have each slot openings 20a.

[0030] As is readily apparent from FIG. 3, applied on each of the end faces 12, 14 is a layer 16, 18 of electrically insulating material to cover the end faces 16, 18. Advantageously, the layers 16, 18 are bonded to the end faces 12, 14, respectively, to thereby coat them. FIG. 2 shows by way of a plan view the presence of the layer 16 of electrically insulating material on the upper end face 12. FIGS. 2 and 3 illustrate together that the layers 16, 18 of electrically insulating material are shaped with a contour that matches a contour of the end faces 12, 14, respectively. By way of example and shown in FIG. 2, the layer 16 of electrically insulating material has a circular shape and includes openings 20b which are in registry with the slot openings 20a of the carrier stack 2.

[0031] While FIGS. 2 and 3 show a currently preferred embodiment of the carrier 4, involving an application of the layers 16, 18 of electrically insulating material to completely cover the corresponding end faces 12, 14, it is, of course, also within the scope of the present invention to apply the electrically insulating material just upon the slot walls 10 that separate the slots 6 to electrically insulate the slot walls 10.

[0032] When producing the carrier 4 (FIG. 3), also the inner walls of the slots 6 can be coated with electrically insulating material. Subsequently, wire is inserted in the slots 6, with wire extending between two slots 6 forming a first winding head 22 at the upper end face 12 and a second winding head 24 at the lower end face 14.

[0033] As is readily apparent from FIG. 3, the wire of each of the winding heads 22, 24 is arranged upon the layers 16, 18 of electrically insulating material, respectively, which in turn is bonded to the corresponding end faces 12, 14. As a result, the wire of each of the winding heads 22, 24 is electrically insulated from the carrier stack 2.

[0034] While the invention has been illustrated and described in connection with currently preferred embodiments shown and described in detail, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit and scope of the present invention. The embodiments were chosen and described in order to explain the principles of the invention and practical application to thereby enable a person skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.

[0035] What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein: