Winding piece and electric machine having such a winding piece

Abstract

The invention relates to a winding piece (1), in particular in the shape of a hairpin, which is provided to be inserted into the grooves (7) of an electrical machine, comprising two limbs (2) and a curved transition region (3), which connects the two limbs (2) to each other. According to the invention, the limbs (2) each have a first portion (4) having a profile, which is adjusted to the cross-section of the groove (7), and an end portion (5), which has a round profile, wherein the winding piece (1) is formed as a hollow conductor, which has a penetrating channel (9), through which a coolant can be led.

Claims

1. A winding piece that is provided to be inserted into one or more grooves of an electrical machine, wherein the winding piece is formed as a hollow conductor having a continuous channel, through which a coolant can be led, wherein the winding piece has a first portion having a rectangular profile and two end portions having a round profile.

2. The winding piece of claim 1, wherein the winding piece is formed in the shape of a hairpin.

3. The winding piece according to claim 1, wherein the winding piece is produced from copper, aluminum or an alloy of copper and aluminum.

4. The electrical machine of claim 1 having an electrical winding for generating an electromagnetic field, wherein the electrical winding comprises several winding pieces.

5. The electrical machine according to claim 4, wherein the winding pieces are connected to one another via one or more connection elements.

6. The electrical machine according to claim 5, wherein the connection elements are formed to be tubular and each connection element has a round inner cross-section on two ends thereof which is adjusted to the round profile of the two end portions of the winding pieces.

7. The electrical machine according to claim 5, wherein the connection elements are curved in the shape of arcs.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail below by way of example by means of the attached drawings.

(2) FIG. 1 a perspective view of a winding piece for an electrical machine in the form of a hairpin;

(3) FIG. 2 a detailed view of a stator of an electrical machine having several winding pieces in the shape of hairpins; and

(4) FIG. 3 a view of a rod-shaped winding piece for an electrical machine.

EMBODIMENTS OF THE INVENTION

(5) FIG. 1 shows a perspective view of a winding piece in the shape of a hairpin for the winding of an electrical machine. Such winding pieces 1 are also referred to as hairpins since they have the shape of a hairpin.

(6) In order to produce an electromagnetic winding of an electrical machine, several hairpins are inserted into the grooves of a stator of the electrical machine and are electrically connected to one another in order to form one or more coils.

(7) The winding piece 1 depicted in FIG. 1 comprises two limbs 2 and a curved transition region 3, which connects the two limbs 2 to each other. Here, the limbs 2 each have a first portion 4 having a profile, which is adjusted to the cross-section of the grooves of the electrical machine, such that they are arranged in the relevant groove in a substantially clearance free manner. The profile of the first portion 4 of the limbs 2 is substantially quadratic in the exemplary embodiment depicted, yet could also be rectangular, for example, or have a different shape. The limbs 2 each have a round profile on their free end portions 5. This has the advantage that the end portions 5 can be fluidically technically connected to one another simply and securely via tubular connection elements 6, as they are depicted in FIG. 2 by way of example.

(8) The hairpin-shaped connection piece 1 from FIG. 1 further comprises a penetrating channel 9 through which a coolant can be led in order to cool the winding of the electrical machine during operation.

(9) The winding piece 1 depicted in FIG. 1 can be produced, for example, from copper. It is preferably provided with an electrically insulating layer on its outer surface.

(10) FIG. 2 shows an enlarged view of a head portion of a stator 8, wherein the end portions 5, which protrude from the grooves 7, of the winding pieces 1 can be seen very clearly. In order to obtain a closed coolant circuit, the free ends or end portions 5 of the winding pieces 1 are hydraulically connected to one another via several tubular connection elements 6. The connection elements 6 are formed to be U-shaped in the depicted exemplary embodiment and each have a round inner diameter on their open ends, such that they can be attached onto the round end portions 5 of the winding pieces 1. The round design here has the advantage that the connection elements 6 can be attached in any alignment, whereby the process can be automated relatively easily.

(11) Finally, FIG. 3 shows another view of a rod-shaped winding piece 1 for an electrical machine. The rod-shaped winding piece 1 in turn has a central portion 4 having a rectangular profile and two end portions 5 having a round profile.

(12) Note: The project that led to this application was carried out as part of the Horizon 2020 subsidy program for research and innovation of the EU as part of grant agreement no. 804219.