RETAINING SYSTEM FOR BUS BARS ON STATORS OR STATOR SEGMENTS OF DYNAMOELECTRIC MACHINES

Abstract

A retaining system for bus bars includes a basic element for fastening to an end face of a stator or stator segment of a dynamoelectric machine, and a predefined number of fixing elements configured to fix the bus bars to the basic element, wherein, when assembled, the retaining system has openings to suppress eddy currents when the bus bars are energized.

Claims

1.-7. (canceled)

8. A retaining system for bus bars, said retaining system comprising: a basic element for fastening to an end face of a stator or stator segment of a dynamoelectric machine; and a predefined number of fixing elements configured to fix the bus bars to the basic element, wherein, when assembled, the retaining system has openings to suppress eddy currents when the bus bars are energized.

9. A stator or stator segment of a dynamoelectric machine, comprising: a laminated core having substantially axially extending grooves; a winding system received in the grooves and forming winding overhangs at end faces of the laminated core; a support system for arrangement of the laminated core, said support system including pressure plates in a region of the end faces and connection elements to fix the pressure plates; bus bars; and a retaining system for the bus bars, said retaining system including a basic element for fastening to an end face of the laminated core, and a predefined number of fixing elements configured to fix the bus bars to the basic element, wherein, when assembled, the retaining system has openings to suppress eddy currents when the bus bars are energized.

10. The stator or stator segment of claim 9, wherein the bus bars extend substantially radially beneath the winding overhangs.

11. The stator or stator segment of claim 9, wherein the basic element of the retaining system is fixed to the pressure plates, and/or the fixing elements are fixed to the basic element by screws.

12. The stator or stator segment of claim 9, wherein the bus bars include insulation elements, at least in a region of the basic elements and the fixing elements.

13. A generator of a wind power plant, said generator comprising a stator or stator segment, said stator or stator segment comprising a laminated core having substantially axially extending grooves, a winding system received in the grooves and forming winding overhangs at end faces of the laminated core, a support system for arrangement of the laminated core, said support system including pressure plates in a region of the end faces and connection elements to fix the pressure plates, bus bars, and a retaining system for the bus bars, said retaining system including a basic element for fastening to an end face of the laminated core, and a predefined number of fixing elements configured to fix the bus bars to the basic element, wherein, when assembled, the retaining system has openings to suppress eddy currents when the bus bars are energized.

14. The generator of claim 13, wherein the bus bars extend substantially radially beneath the winding overhangs.

15. The generator of claim 13, wherein the basic element of the retaining system is fixed to the pressure plates, and/or the fixing elements are fixed to the basic element by screws.

16. The generator of claim 13, wherein the bus bars include insulation elements, at least in a region of the basic elements and the fixing elements.

17. A wind power plant, comprising a generator as set forth in claim 13.

Description

[0020] FIG. 1 shows elements of the retaining system,

[0021] FIG. 2 shows a perspective representation of bus bars in the retaining system,

[0022] FIG. 3 shows a stator segment,

[0023] FIG. 4 shows a basic arrangement of stator segments,

[0024] FIG. 5 shows a directly driven generator,

[0025] FIG. 6 shows a wind power plant.

[0026] FIG. 1 shows a retaining system 1 which in essence is composed of a basic element 2 and fixing elements 3 made of steel. These basic elements 2, when installed, are fastened to a pressure plate 16 by means of screw connections 4, The fixing elements 3, when installed, are fastened to the respective basic element 2. The fixing elements 3 have feet 10 to enclose a notch 9 of the basic element 2, an asymmetrically arranged drilled hole 8 ensuring that there is no confusion of the installation position of the fixing elements 3.

[0027] When the retaining system 1 is assembled, there are now installation spaces 6 for the bus bars 7, as well as, if necessary, for neutral point connections or earthing cables. When assembled, the retaining system 1 has openings 5. This suppresses eddy currents when the bus bars 7 are energized as there are no closed metallic connections between the individual elements.

[0028] FIG. 2 shows a partially perspective representation of the arrangement of the bus bars 7 within the retaining system 1, the retaining system 1 in this case being attached to the pressure plates 16 of a stator 22 or of a stator segment 13. In the region of the basic element 2 and the fixing elements 3, the bus bars 7 have insulation elements 12, which have different thicknesses depending on the voltage applied to them.

[0029] FIG. 3 shows an exemplary stator segment 13 in a perspective, but non-scale, representation, with retaining system 1 but without bus bars 7, the laminated core 14 being constructed in the axial direction from partial laminated cores. The laminated core 14 is delimited and fixed in the axial direction by pressure plates 16, with connection elements in this case holding the pressure plates 16 together at the end faces of the stator segment 13. Form-wound coils 18, the winding overhangs of which have different offsets, are arranged in grooves of the laminated core 14, which are not pictured in detail. Electrical energy is now provided to, or drawn off from, these form-wound coils 18. This is effected via the bus bars 7, which are positioned on the retaining system 1, at the end face, in particular on the pressure plates 16.

[0030] The bus bars 7 in this case extend over the entire circumferential width of a stator segment 13, thus corresponding approximately to the length of the pressure plate 16. The bus bars 7 may be longer or shorter, depending on the type of connection to the circumferentially adjacent stator segments.

[0031] FIG. 4 shows a basic representation of a stator 22 constructed from stator segments 13, wherein, of a retaining system 1 that has three bus bars 7, the respective coils 18, or coil groups, of each stator segment 13 are contacted via this bus bar system.

[0032] The bus bars 7 in this case are of a curved design, and substantially follow the radius of the stator 22. Each stator segment 13 in this case may have its bus bars 7 already positioned in the retaining system 1. When the stator segments 13 are assembled to form a stator 22, the respective bus bars 7 are also subsequently contacted.

[0033] Also possible, however, are respective bus bar sections that extend in the circumferential direction over two, three or more segments. Accordingly, quarter circles or even half circles are possible. The electrical connection lines 20 must be adapted accordingly.

[0034] Contact elements 21 effect electrical contacting between bus bar sections of one phase. Such electrical contacting of the bus bar sections in the circumferential direction can be effected by plugging together, welding, stranded wire connections, etc.

[0035] The compact structure can be sufficiently cooled by fans, by means of correspondingly guided air flows over, or through, the laminated core 14, as well as in the region of the winding overhangs and the bus bars 7.

[0036] FIG. 5 shows a basic arrangement of a directly driven generator 24 of a wind power plant 27, the rotation of the blades 25 driving a rotor 23 which, through electromagnetic interaction with a winding system of the stator 22, generates electrical energy that is made available to a supply grid 26 via a converter unit 30.

[0037] Such an arrangement is to be provided, for example, in the case of wind power plants 27 according to FIG. 6, in which there is a generator 24 arranged in a nacelle 29 on a tower 28.