Fanning strip iron core structure for doubly-fed wind generator

Abstract

The utility model relates to a fanning strip iron core structure for a doubly-fed wind generator, which comprises a rotating shaft component and a rotor iron core component, the rotor iron core component is fixedly arranged on the rotating shaft component, the rotating shaft component comprises a rotating shaft part and a rotor iron core support, and the rotor iron core component is fixedly arranged on the rotor iron core support. The rotor iron core component comprises a plurality of rotor iron core parts, each rotor iron core part is fixedly arranged on the rotor iron core support, the plurality of rotor iron core parts are stacked in an array from front to back to form a whole, and each rotor iron core part is formed by combining a plurality of iron core fan-shaped parts in the circumferential direction. Each iron core fan-shaped part is fixedly arranged on the rotor iron core bracket, and each iron core fan-shaped part is formed by stacking a plurality of iron core fan-shaped sheets from front to back in an array manner to form a whole. The rotor core is reasonable in structure, and a larger doubly-fed wind generator rotor core with the fanning strips can be manufactured and used economically and reliably.

Description

Technical Field

[0001] The utility model relates to a generator device, in particular to an iron core structure for a double-fed wind generator. Background Art

[0002] At present, the competition in the wind turbine market is fierce. In order to gain a competitive advantage, various wind turbine manufacturers are competing to develop higher-power onshore doubly-fed models (typically 10MW and above). In the past, when the power of doubly-fed models was relatively small (such as below 10MW), the rotor core was usually stacked with full-circle punchings and fixed on the rotor shaft by shrink sleeve. A typical traditional doubly-fed wind turbine generator has rotor punchings, a rotor and a generator. The rotor punchings are made of full circles. After the core is stacked, it is heated, and the inner hole is enlarged, and the core is sleeved on the rotor shaft. Generally, when the core is in a hot state, the core is pressurized by a tool or hydraulic press, and the core is pressurized by a shoulder or round nut at both ends of the core. The axial internal pressure of the core and the radial pre-pressure of the interference with the shaft enable the core to reliably transmit the electromagnetic torque to the rotor shaft.

[0003] The outer diameter of the rotor of a higher-power doubly-fed generator is generally greater than 1200mm (the width of traditional electrical steel strips), so fan-shaped punching sheets must be used. After the fan-shaped punching sheets are used, the core needs to be stacked in an alternating manner with the upper and lower layers of the whole circle; after the stacking is completed and pressurized, a tightening screw is required to ensure the pressure between the core layers; the radial stiffness of the core constructed by the fan-shaped punching sheets is much lower than the radial stiffness of the core constructed by the whole circle punching sheets, and the preload force generated after the shrink sleeve is insufficient. Therefore, the rotor core and the shaft are usually fixed by key connection and additional keying (traditional rotor fixing of large generator sets such as hydropower and thermal power). Generally, the core is heated and expanded first, and then the key is tightened. This process and fixing scheme are complicated to implement, and the core needs to be heated. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a fan-shaped sheet core structure for a doubly fed wind turbine generator, including a shaft component and a rotor core component, the rotor core component is fixedly mounted on the shaft component, the shaft component includes a shaft part and a rotor core bracket, the rotor core component is fixedly mounted on the rotor core bracket, the rotor core component includes a number of rotor core parts, each rotor core part is fixedly mounted on the rotor core bracket, and a number of rotor core parts are stacked in an array from front to back to form a whole, each rotor core part is composed of a number of core fan-shaped parts combined along the circumferential direction, and each core fan-shaped part is fixedly mounted on the rotor core bracket, and each core fan-shaped part is composed of a number of core fan-shaped sheets stacked in an array from front to back to form a whole.

[0005] Preferably, the outer circumference of the rotor core support is detachably fixed with a plurality of fixing keys along the circumferential direction, and each core sector piece is provided with a dovetail groove on its body. Through the cooperation of the fixing key and the dovetail groove, a plurality of core sector pieces are fixedly mounted on the rotor core support and stacked in an array from front to back.

[0006] Preferably, the rotating shaft component includes a DE end rotor shaft body, a DE end ring plate, an NDE end rotor shaft body and an NDE end ring plate. The rotating shaft component includes a DE end rotor shaft body fixedly connected to the DE end ring plate, and fixedly mounted on one end of the rotor core bracket through the DE end ring plate, and an NDE end rotor shaft body fixedly connected to the NDE end ring plate, and fixedly mounted on the other end of the rotor core bracket through the NDE end ring plate.

[0007] Preferably, the rotor core support is uniformly provided with a plurality of ventilation holes along the circumferential direction, and the body of the rotor core support is uniformly provided with a plurality of fixing grooves for accommodating fixing keys along the circumferential direction, and each fixing key is fixedly installed in the corresponding fixing groove by a connecting bolt.

[0008] Preferably, a plurality of dovetail grooves are evenly opened along the circumferential direction on the lower edge of each core sector piece, a plurality of groove holes are evenly opened along the circumferential direction on the upper edge of each core sector piece, and a plurality of tensioning bolt holes are evenly opened along the circumferential direction on the body of each core sector piece located between the dovetail groove and the groove hole.

[0009] Preferably, the rotor core bracket is located at the front and rear ends of the rotor core component and is fixedly equipped with an end pressure plate and a tooth pressure plate. The end pressure plate is an annular plate, and the plate body of the end pressure plate is uniformly provided with a plurality of tightening bolt holes 2 along the circumferential direction. The tooth pressure plate is an annular plate, and the upper edge of the plate body of the tooth pressure plate is uniformly provided with rack holes matching the groove holes along the circumferential direction, and the lower edge of the plate body of the tooth pressure plate is uniformly provided with a plurality of dovetail grooves 2 along the circumferential direction. The plate body of the tooth pressure plate is located between the rack hole and the dovetail groove 2 and is uniformly provided with a plurality of tightening bolt holes 3 along the circumferential direction.

[0010] Preferably, a ventilation gap is provided between two adjacent rotor core components.

[0011] Preferably, the body of the rotor core support has a wind shielding plate.

[0012] By means of the above solution, the utility model has at least the following advantages:

[0013] The technical solution of the present application can realize the economical and reliable manufacture and use of a larger double-fed wind turbine rotor core with fan-shaped pieces. First, the shaft component includes a shaft component and a rotor core bracket. The split structure can facilitate installation and processing, and can also facilitate the installation of the rotor core component.

[0014] Furthermore, a number of rotor core components constitute a whole, namely, a rotor core member, a number of core sector components constitute a whole, namely, a rotor core component, and finally a number of core sector sheets constitute a core sector component, and each core sector sheet is integrally punched out by a mold, which can be conveniently mass-produced while being formed in one step, and the precision of each sheet can be guaranteed, and the outer circle of the rotor core bracket is a machined surface, and the outer circle turning process is preferably used, which can be used as a radial positioning reference when the core is stacked, and a number of slot sample rods are inserted into the slot portion of the core segment, so that the front and rear of the core sector sheet can be obtained. The stacked circumferential positioning reference; the rotor core bracket surface is evenly distributed with fixing grooves in the circumferential direction, preferably milled. Before lamination, the fixing key is pre-installed in the corresponding fixing groove and fixed with connecting bolts but not tightened. After the core sector pieces are stacked and pressurized, the tensioning bolts are tightened to maintain a certain pressure between the core sector pieces. Finally, the connecting bolts at the fixing key are tightened so that the fixing key is pressed on the dovetail groove of each core sector piece. It is worth mentioning that a reasonable clearance is selected between the fixing key and the fixing groove, so that the fixing key can be easily installed and loaded;

[0015] Such a structure can transmit the gravity, centrifugal force and electromagnetic torque of the rotor core itself to the rotor core bracket, and can also transmit the circumferential tangential load through the fixing key. The connecting bolts at the fixing key only bear the axial load of the bolt, so the overall structure load transmission is more reasonable and effective.

[0016] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a fan-shaped sheet iron core structure for a doubly-fed wind turbine generator of the present application;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the rotating shaft component of the present application;

[0020] Figure 3 It is a schematic diagram of the structural relationship between the core sector pieces and the rotor core bracket of the present application;

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the iron core sector component of the present application;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the iron core sector of the present application;

[0023] Figure 6 It is a three-dimensional structural schematic diagram of the tooth pressure plate of the present application;

[0024] Figure 7 It is a three-dimensional structural schematic diagram of the ventilation partition of the present application.

[0025] In the figure: 1 shaft component, 2 rotor core component, 3 rotor core bracket, 4 core sector component, 5 core sector piece, 6 fixing key, 7 dovetail slot one, 8DE end rotor shaft body, 9DE end ring plate, 10NDE end rotor shaft body, 11NDE end ring plate, 12 vent, 13 fixing slot, 14 slot hole, 15 tightening bolt hole one, 16 end pressure plate, 17 tooth pressure plate, 18 tightening bolt hole two, 19 rack hole, 20 dovetail slot two, 21 tightening bolt hole three, 22 wind baffle, 23 ventilation baffle. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] See also Figure 1 to Figure 7 A fan-shaped sheet core structure for a doubly fed wind turbine generator described in a preferred embodiment of the utility model includes a shaft component 1 and a rotor core component 2. The rotor core component 2 is fixedly mounted on the shaft component 1. The shaft component 1 includes a shaft part and a rotor core bracket 3. The rotor core component 2 is fixedly mounted on the rotor core bracket 3. The rotor core component 2 includes a number of rotor core parts, each of which is fixedly mounted on the rotor core bracket 3, and a number of rotor core parts are stacked in an array from front to back to form a whole. Each rotor core part is composed of a number of core fan-shaped parts 4 combined along the circumferential direction, and each core fan-shaped part 4 is fixedly mounted on the rotor core bracket 3. Each core fan-shaped part 4 is composed of a number of core fan-shaped sheets 5 stacked in an array from front to back to form a whole.

[0028] Preferably, the outer circumference of the rotor core support 3 is detachably fixed with a plurality of fixing keys 6 along the circumferential direction, and each core sector piece 5 is provided with a dovetail groove 7. By matching the fixing keys 6 with the dovetail groove 7, a plurality of core sector pieces 5 are fixedly mounted on the rotor core support 3 and stacked in an array from front to back.

[0029] Preferably, the shaft component includes a DE end rotor shaft 8, a DE end ring plate 9, an NDE end rotor shaft 10 and an NDE end ring plate 11. The shaft component includes a DE end rotor shaft 8 fixedly connected to the DE end ring plate 9, and fixedly mounted on one end of the rotor core bracket 3 through the DE end ring plate 9, and an NDE end rotor shaft 10 fixedly connected to the NDE end ring plate 11, and fixedly mounted on the other end of the rotor core bracket 3 through the NDE end ring plate 11.

[0030] Preferably, the rotor core support 3 is uniformly provided with a plurality of ventilation holes 12 along the circumferential direction, and the body of the rotor core support 3 is uniformly provided with a plurality of fixing grooves 13 for accommodating the fixing keys 6 along the circumferential direction, and each fixing key 6 is fixedly installed in the corresponding fixing groove 13 by connecting bolts.

[0031] Preferably, a plurality of dovetail grooves 7 are evenly opened along the circumferential direction on the lower edge of each core sector piece 5, a plurality of groove holes 14 are evenly opened along the circumferential direction on the upper edge of each core sector piece 5, and a plurality of tightening bolt holes 15 are evenly opened along the circumferential direction on the body of each core sector piece 5 between the dovetail groove 7 and the groove hole 14.

[0032] Preferably, the rotor core bracket 3 is located at the front and rear ends of the rotor core component 2 and is fixedly equipped with an end pressure plate 16 and a tooth pressure plate 17. The end pressure plate 16 is an annular plate, and the plate body of the end pressure plate 16 is uniformly provided with a plurality of tightening bolt holes 18 along the circumferential direction. The tooth pressure plate 17 is an annular plate, and the plate body of the tooth pressure plate 17 is uniformly provided with rack holes 19 matching the groove holes 14 along the circumferential direction on the upper edge of the plate body, and the plate body of the tooth pressure plate 17 is uniformly provided with a plurality of dovetail grooves 20 along the circumferential direction on the lower edge of the plate body. The plate body of the tooth pressure plate 17 is located between the rack hole 19 and the dovetail groove 20 and is uniformly provided with a plurality of tightening bolt holes 3 21 along the circumferential direction.

[0033] The tension bolts can pass through the end pressure plate 16, the tooth pressure plate 17 and all the core segments 5, and the tension bolts can ensure that all the core segments 5 are reliably stacked front to back.

[0034] Preferably, a ventilation gap is provided between two adjacent rotor core components.

[0035] Two ventilation baffles 23 may be provided between two adjacent rotor core components. The profile of each ventilation baffle 23 is the same as that of the tooth pressure plate 17. The two ventilation baffles 23 are stacked front to back with a spacer plate provided therebetween, thus forming a ventilation gap.

[0036] Preferably, the body of the rotor core support 3 has a wind shielding plate 22 .

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A fan-shaped sheet iron core structure for a doubly-fed wind turbine generator, characterized in that: The invention comprises a rotating shaft component (1) and a rotor core component (2), wherein the rotor core component (2) is fixedly mounted on the rotating shaft component (1), the rotating shaft component (1) comprises a rotating shaft part and a rotor core support (3), the rotor core component (2) is fixedly mounted on the rotor core support (3), the rotor core component (2) comprises a plurality of rotor core parts, each of which is fixedly mounted on the rotor core support (3), and the plurality of rotor core parts are stacked in an array from front to back to form a whole, each of which is composed of a plurality of core sector parts (4) combined in a circumferential direction, and each of which is fixedly mounted on the rotor core support (3), and each of which is composed of a plurality of core sector sheets (5) stacked in an array from front to back to form a whole.

2. The fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 1, characterized in that: The outer circumference of the rotor core support (3) is detachably fixedly provided with a plurality of fixing keys (6) along the circumferential direction, and each core sector piece (5) is provided with a dovetail groove (7) on its body. By means of the fixing keys (6) being matched with the dovetail groove (7), a plurality of core sector pieces (5) are fixedly mounted on the rotor core support (3) and stacked in an array from front to back.

3. The fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 1, characterized in that: The rotating shaft component comprises a DE end rotor shaft body (8), a DE end ring plate (9), an NDE end rotor shaft body (10) and an NDE end ring plate (11); the rotating shaft component comprises a DE end rotor shaft body (8) fixedly connected to the DE end ring plate (9) and fixedly mounted on one end of a rotor core support (3) via the DE end ring plate (9); and an NDE end rotor shaft body (10) fixedly connected to the NDE end ring plate (11) and fixedly mounted on the other end of the rotor core support (3) via the NDE end ring plate (11).

4. The fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 3, characterized in that: The rotor core support (3) is provided with a plurality of ventilation openings (12) evenly arranged along the circumference, and the body of the rotor core support (3) is provided with a plurality of fixing grooves (13) evenly arranged along the circumference for accommodating fixing keys (6), and each fixing key (6) is fixedly mounted in a corresponding fixing groove (13) by means of a connecting bolt.

5. The fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 2, characterized in that: A plurality of dovetail grooves (7) are evenly formed on the lower edge of each core sector piece (5) along the circumferential direction, a plurality of slot holes (14) are evenly formed on the upper edge of each core sector piece (5) along the circumferential direction, and a plurality of tension bolt holes (15) are evenly formed on the body of each core sector piece (5) between the dovetail groove (7) and the slot hole (14) along the circumferential direction.

6. A fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 1 or 5, characterized in that: The rotor core bracket (3) is located at both the front and rear ends of the rotor core member (2) and is fixedly provided with an end pressure plate (16) and a tooth pressure plate (17). The end pressure plate (16) is an annular plate, and a plate body of the end pressure plate (16) is uniformly provided with a plurality of tension bolt holes (18) along the circumferential direction. The tooth pressure plate (17) is an annular plate, and a rack hole (19) matching the groove hole (14) is uniformly provided along the circumferential direction on the upper edge of the plate body of the tooth pressure plate (17), and a plurality of dovetail grooves (20) are uniformly provided along the circumferential direction on the lower edge of the plate body of the tooth pressure plate (17). A plurality of tension bolt holes (21) are uniformly provided along the circumferential direction on the plate body of the tooth pressure plate (17) between the rack hole (19) and the dovetail groove (20).

7. The fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 1, characterized in that: A ventilation gap is provided between two adjacent rotor core components.

8. The fan-shaped sheet iron core structure for a doubly-fed wind turbine generator according to claim 4, characterized in that: The rotor core support (3) has a wind shielding plate (22) on its frame.

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