Winding with a cooling channel for an electrical machine

Abstract

A winding for an electric machine is provided. The electric machine includes conductor bars which are arranged one above the other and each of which has a cooling slot. The conductor bars are designed such that the height of the conductor bars increases in the radial direction and the effective cooling cross-section decreases in the radial direction.

Claims

1. A winding for an electrical machine, said winding comprising: multiple conductor bars that are arranged one on top of the other above a groove base duct, wherein the conductor bars comprise in each case a cooling slit that is embodied in a downwards direction, wherein the width of the cooling slits reduces in the radial direction from the groove base duct, wherein the height of the individual conductor bars increases in the radial direction from the groove base duct, wherein cooling slit cross sections decrease in the radial direction from the groove base duct.

2. The winding according to claim 1, further comprising insulating strips arranged between the conductor bars.

3. The winding according to claim 1, wherein each transition between adjacent cooling slits is characterized by a step transition in the widths.

4. The winding according to claim 1, wherein the cross sections and height of each slit are configured to homogenize temperatures of the conductor bars.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawing:

(2) The FIGURE illustrates a cross sectional view of a winding in accordance with the invention for an electrical machine.

DETAILED DESCRIPTION OF INVENTION

(3) The cross sectional view that is illustrated in the FIGURE illustrates a part of a winding 1 for an electrical machine. The winding comprises multiple conductor bars 2a, 2b, 2c, 2d and 2e that are arranged one on top of the other. These conductor bars 2a to 2e are arranged one on top of the other in a radial direction 3. During operation, a cooling medium such as for example air or a gas flows through a groove base duct 4 and at that location through cooling openings 5 through the first conductor bar 2a. The first conductor bar 2a comprises a first cooling slit 6a having a width. An insulation 7 is arranged between the first conductor bar 2a and the second conductor bar 2b. Likewise, an insulation is arranged between the second conductor bar 2b and the third conductor bar 2c and also between the remaining conductor bars 2d etc. that are arranged one on top of the other. The width of the cooling slits 6a, 6b, 6c, 6d, 6e and 6f reduces in the radial direction 3. This means that the flow cross section for the flow medium becomes increasingly narrower in the radial direction. The flow cross section within the cooling slits 6a, . . . , 6f is known.

(4) A second fundamentally technical feature of the conductor bars 2a to 2e is that the height 8a, 8b, 8c, 8d, 8e and 8f increases. This means that the conductor bar 2a comprises the smallest height 8a. The height increases in each case in the radial direction by a value between 5% and 80%.