Wind turbine generator rotor coil structure and wind turbine generator

Abstract

The utility model discloses a wind turbine generator rotor coil structure, which relates to a generator rotor structure and comprises a rotor iron core, an upper layer coil and a lower layer coil, the upper layer coil and the lower layer coil are overlapped and nested in an axial groove of the rotor iron core, and a rotor groove wedge is embedded at an opening of the axial groove. The upper layer coil and the lower layer coil are used for preventing the upper layer coil and the lower layer coil from being separated from the axial grooves, a plurality of rotor end hoops are arranged on the peripheries of the two ends of the upper layer coil at intervals, the rotor end hoops and the upper layer coil are separated through upper layer filler strips, and the ends of the lower layer coil are fixed through binding polyester glass ropes. Through the arrangement, the problem that the temperature of the coil at the end of the rotor is too high due to poor heat dissipation effect can be avoided. The utility model also discloses a wind turbine generator comprising the rotor coil structure of the wind turbine generator.

Description

Technical Field

[0001] The utility model relates to the technical field of generator rotor structures, in particular to a wind turbine generator rotor coil structure and a wind turbine generator. Background Art

[0002] As the power of wind turbines increases, the size of generators is also getting larger. In order to ensure the insulation performance and strength of the generator, a large number of shaping and reinforcement technologies are used at the ends of the rotor coils of the generator. In addition, the wiring at both ends of the rotor coils is complex, the gap between the coils is small, and some positions even need to be filled with felt materials. In addition, processes such as varnishing are used to fill the gaps between the coils at both ends of the rotor, and the gaps in the rotor end structure are small.

[0003] The generator generates a lot of heat during operation, which heats the stator and rotor. Although forced ventilation cooling is used to cool the stator and rotor, due to the compact structure of the rotor end, the upper and lower coils are fixed with end hoops, which are solid structures. This hinders the circulation of cooling air at the generator end, resulting in small air volume and poor heat dissipation, which leads to excessively high temperature of the rotor end coil. Excessive temperature will have a great negative impact on the insulation and reliable operation of the generator. Improving the ventilation and heat dissipation capacity of the rotor end is of great significance for the safe and stable operation of the doubly fed generator.

[0004] Therefore, how to avoid the problem of excessive temperature of the rotor end coil due to poor heat dissipation effect is a technical problem that technical personnel in this field need to solve at present. Utility Model Content

[0005] The utility model aims to provide a wind turbine generator rotor coil structure, which can avoid the problem of excessive temperature of the rotor end coil due to poor heat dissipation effect. Another purpose of the utility model is to provide a wind turbine generator including the above rotor coil structure.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A wind turbine generator rotor coil structure comprises: a rotor core and an upper coil and a lower coil, wherein the upper coil and the lower coil are overlapped and nested in an axial slot of the rotor core, a rotor slot wedge is embedded at the opening of the axial slot to prevent the upper coil and the lower coil from escaping from the axial slot, a plurality of rotor end hoops are arranged at intervals on the outer circumference of both ends of the upper coil, an upper pad is arranged between the upper coil and the rotor slot wedge, and the end of the lower coil is fixed by binding polyester-glass rope.

[0008] Preferably, an insulating gasket is provided between the upper coil and the lower coil to protect the insulation of the upper coil and the lower coil. The upper coil and the lower coil have the same axial length and are both greater than the axial length of the rotor core. The length of the upper gasket matches the length of the upper coil and the lower coil, and the lengths of the upper gasket, the upper coil and the lower coil extending along the axial ends of the rotor are the same.

[0009] Preferably, four rotor end hoops are provided, which are respectively arranged at positions close to both ends of the rotor core and at both ends of the upper coil.

[0010] Preferably, a plurality of polyester-glass ropes are arranged at both ends of the lower coil perpendicular to the axis of the rotor core, and two adjacent polyester-glass ropes are arranged at intervals.

[0011] A wind turbine generator comprises any one of the above-mentioned wind turbine generator rotor coil structures.

[0012] Compared with the above-mentioned background technology, the wind turbine generator rotor coil structure provided by the utility model includes: a rotor core and an upper coil and a lower coil. The upper coil and the lower coil are overlapped and nested in the axial slot of the rotor core. The opening of the axial slot is inlaid with a rotor slot wedge to prevent the upper coil and the lower coil from escaping from the axial slot. A plurality of rotor end hoops are respectively arranged at intervals on the outer periphery of the two ends of the upper coil. An upper gasket is provided between the upper coil and the rotor slot wedge, and the end of the lower coil is fixed by binding polyester glass rope.

[0013] That is to say, the two ends of the rotor provided in this embodiment can first be ventilated through the intervals set between the rotor end hoops, and the lower coil in this embodiment is tied and fixed by a polyester glass rope, and the polyester glass rope is narrow in width and covers a smaller area of ​​the lower coil, which can avoid affecting the ventilation and heat dissipation of the lower coil when fixing the lower coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0015] Figure 1 The overall schematic diagram of the rotor coil structure provided by the embodiment of the utility model;

[0016] Figure 2 A schematic diagram of the structure of the upper coil end provided by an embodiment of the utility model;

[0017] Figure 3This is a schematic structural diagram of the lower coil end provided by an embodiment of the utility model.

[0018] in:

[0019] 01-rotor core, 02-upper coil, 03-lower coil, 04-upper gasket, 05-rotor end hoop, 06-polyester rope, 07-rotor slot wedge. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] In the description of the present invention, it is necessary to understand that the terms "upper" and "lower" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0023] The utility model aims to provide a wind turbine generator rotor coil structure, which can avoid the problem of excessive temperature of the rotor end coil due to poor heat dissipation effect.

[0024] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0025] See also Figures 1 to 3 The present embodiment provides a wind turbine generator rotor coil structure, comprising: a rotor core 01, an upper coil 02 and a lower coil 03, wherein the upper coil 02 and the lower coil 03 are overlapped and nested in the axial slot of the rotor core 01, and a rotor slot wedge 07 is embedded at the opening of the axial slot to prevent the upper coil 02 and the lower coil 03 from escaping from the axial slot, and a plurality of rotor end hoops 05 are arranged at intervals on the outer periphery of both ends of the upper coil 02, an upper pad is arranged between the upper coil 02 and the rotor slot wedge 07, and the end of the lower coil 03 is fixed by binding a polyester glass rope 06.

[0026] Specifically, Figure 1As shown, the upper coil 02 and the lower coil 03 are both nested in the axial slot of the rotor core 01, the lower coil 03 is at the bottom of the axial slot, and the upper coil 02 is overlapped on the top of the lower coil 03, that is, the upper coil 02 is pressed against the lower coil 03. Of course, insulation treatment needs to be done between the upper coil 02 and the lower coil 03. In order to prevent the upper coil 02 and the lower coil 03 from being thrown out of the axial slot when the rotor rotates, a core slot wedge is embedded at the notch of the axial slot, that is, the core slot wedge is arranged at the outermost side of the axial slot to fix the upper coil 02 and the lower coil 03. Figure 2 As shown; a plurality of rotor end hoops 05 are arranged at intervals on the outer circumference of both ends of the upper coil 02 for fixing the upper coil 02, but a gap is left between each two rotor end hoops 05, so that a gap can be left for passing wind into the rotor coil for heat dissipation; and the rotor slot wedge 07 is separated from the upper coil 02 by the upper pad 04, which is convenient for the axial flow of air, thus being beneficial to the ventilation and heat dissipation of the rotor. In addition, the lower coil 03 also needs to be fixed. Therefore, in order to be able to use the polyester glass rope 06 to bind and fix without affecting the ventilation and heat dissipation, the polyester glass rope 06 covers a smaller area of ​​the lower coil 03, as shown in FIG. Figure 3 As shown, this can minimize the impact on the ventilation between the lower coils 03.

[0027] That is to say, the two ends of the rotor provided in this embodiment can first be ventilated through the gaps set between the rotor end hoops 05; secondly, in this embodiment, an upper pad 04 is provided between the upper coil 02 and the rotor slot wedge 07, so that a gap is left between the two for ventilation and heat dissipation; finally, the lower coil 03 in this embodiment is tied and fixed by a polyester glass rope 06, and the polyester glass rope 06 is narrow in width and covers a small area of ​​the lower coil 03, which can avoid affecting the ventilation and heat dissipation of the lower coil 03 when fixing the lower coil 03.

[0028] Preferably, an insulating gasket is provided between the upper coil 02 and the lower coil 03 to protect the insulation of the upper coil 02 and the lower coil 03. The upper coil 02 and the lower coil 03 have the same axial length and are both greater than the axial length of the rotor core 01. The length of the upper gasket 04 matches the length of the upper coil 02 and the lower coil 03. The lengths of the upper gasket 04, the upper coil 02 and the lower coil 03 extending from both ends along the axial direction of the rotor are the same.

[0029] Specifically, an insulating pad is provided between the upper coil 02 and the lower coil 03, so that the upper coil 02 and the lower coil 03 are easily isolated. In this embodiment, the upper coil 02 and the lower coil 03 have the same length and both extend beyond the axial length of the rotor core 01, and the lengths of both ends of the upper coil 02 and the lower coil 03 extending beyond the rotor core 01 are equal, while the length of the upper pad 04 is greater than the axial length of the rotor core 01 and slightly smaller than the lengths of the upper coil 02 and the lower coil 03, and the lengths of the upper pad 04 extending beyond the two ends of the rotor core 01 are also equal, so that the upper pad 04 can effectively separate the rotor slot wedge 07 and the upper coil 02, and does not affect the welding required at both ends of the upper coil 02 and the lower coil 03 when in use.

[0030] Preferably, four rotor end hoops 05 are provided, which are respectively arranged at positions close to both ends of the rotor core 01 and at both ends of the upper coil 02 .

[0031] Specifically, Figure 1 As shown, rotor end hoops 05 are provided at both ends of the rotor, and two are provided at each section, one of which is provided at the end of the upper coil 02 and tied to the outer side of the upper coil 02, and the other is provided at the end of the rotor core 01 and tied to the outer side of the upper pad 04; in this way, a gap is left between the two rotor end hoops 05 at each end of the rotor, which facilitates ventilation and heat dissipation to the inside of the rotor.

[0032] In this embodiment, the specific filling method is to fill insulating materials at both ends of the end bevel gap, and reserve a ventilation gap in the middle of the bevel gap. Of course, the specific filling method can also be adjusted according to actual conditions, as long as a ventilation gap is reserved, and this article does not make specific limitations.

[0033] Preferably, a plurality of polyester-glass ropes 06 are arranged at both ends of the lower coil 03 perpendicular to the axis of the rotor core 01, and two adjacent polyester-glass ropes 06 are arranged at intervals.

[0034] It is understandable that both ends of the lower coil 03 also need to be fixed during use, but at the same time, it is also necessary to not affect the ventilation and heat dissipation of the rotor. Therefore, in this embodiment, the lower coil 03 is preferably fixed with a polyester glass rope 06, and in order to increase the fixing effect of the lower coil 03, a plurality of polyester glass ropes 06 are arranged at the end of the lower coil 03, and adjacent polyester glass ropes 06 are arranged at intervals, and the interval between two adjacent polyester glass ropes 06 can be used for ventilation.

[0035] Of course, the number of polyester-glass ropes 06 can be adjusted according to actual conditions as long as the expected effect is achieved, and this article does not make any specific restrictions.

[0036] In addition, this article also provides a wind turbine generator, which includes the above-mentioned wind turbine generator rotor coil structure.

[0037] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0038] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0039] The above is a detailed introduction to the embodiments provided by the utility model. This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A wind turbine generator rotor coil structure, characterized in that: include: A rotor core (01) and an upper coil (02) and a lower coil (03), wherein the upper coil (02) and the lower coil (03) are overlapped and nested in an axial slot of the rotor core (01); a rotor slot wedge (07) is embedded at the opening of the axial slot to prevent the upper coil (02) and the lower coil (03) from escaping from the axial slot; a plurality of rotor end hoops (05) are respectively arranged at intervals on the outer periphery of both ends of the upper coil (02); an upper gasket (04) is provided between the upper coil (02) and the rotor slot wedge (07); and the ends of the lower coil (03) are fixed by binding with a polyester glass rope (06).

2. The wind turbine generator rotor coil structure according to claim 1, characterized in that: An insulating pad is provided between the upper coil (02) and the lower coil (03) for protecting the insulation of the upper coil (02) and the lower coil (03); the upper coil (02) and the lower coil (03) have the same axial length and are both greater than the axial length of the rotor core (01); the length of the upper pad (04) matches the length of the upper coil (02) and the lower coil (03); and the upper pad (04), the upper coil (02), and the lower coil (03) have the same length extending along the axial ends of the rotor.

3. The wind turbine generator rotor coil structure according to claim 2, characterized in that: The rotor end hoops (05) are provided with four ends, which are respectively arranged at positions close to both ends of the rotor core (01) and at both ends of the upper coil (02).

4. The wind turbine generator rotor coil structure according to claim 3, characterized in that: A plurality of polyester-glass ropes (06) are arranged at both ends of the lower layer coil (03) perpendicular to the axis of the rotor core (01), and two adjacent polyester-glass ropes (06) are arranged at intervals.

5. A wind turbine generator, characterized in that: It comprises the wind turbine generator rotor coil structure according to any one of claims 1 to 4.

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