A semi-direct drive wind turbine generator set

Abstract

The present invention belongs to the technical field of wind turbines and discloses a semi-direct-drive wind turbine generator set, comprising a generator, a gearbox, a high-frequency grounding strap, and a protective module. The generator includes a stator base, stator windings, and a rotor assembly; the gearbox includes a housing connected to the stator base and an output shaft rotatably connected to the housing, the output shaft being connected to the rotor assembly; the housing and the stator base are grounded separately via the high-frequency grounding strap; and the protective module is capable of reducing common-mode voltage to reduce shaft current on the output shaft. The semi-direct-drive wind turbine set of the present invention, by providing the high-frequency grounding strap and the protective module, reduces the induced voltage in the output shaft region on the gearbox side, protects the gearbox structure from electrical corrosion, and extends its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to a semi-direct drive wind turbine generator set. Background Art

[0002] like Figure 1 As shown, shaft voltage is the potential difference between the output shaft 21' of the gearbox 2', a local area of ​​the output shaft 21', and the output shaft 21' relative to ground during generator 1' operation. This voltage is primarily caused by shaft currents generated by magnetic flux asymmetry, shaft voltages and currents introduced by the inverter, and shaft voltages and currents caused by static electricity. In wind turbines, generators 1' are large, high-speed generators, generating a high level of high-frequency common-mode voltage. This can occur if the bearings 22' and tooth surfaces 23' mounted on the output shaft 21' have surface defects, the lubricating oil quality or flow rate does not meet standards, or the generator 1' experiences abnormal vibration, leading to metallic contact between the output shaft 21' and bearings 22', or between the teeth, or if the discharge threshold (> the oil film threshold voltage) is reached, causing high-frequency discharge. When the current "arc" breaks through the oil film, a considerable shaft current is instantly generated and acts on the surface of the bearing 22' and the output shaft 21' (or the tooth and tooth surface). The discharge (EDM) will form many molten pits on the bearing 22' and the tooth surface 23', which will cause damage to the bearing 22' and the tooth surface 23', generating vibration and noise.

[0003] There are three structures of wind turbine generator sets: direct drive, semi-direct drive and doubly fed. Semi-direct drive wind turbine generator sets are highly integrated with gearbox 2', generator 1' and main shaft. Figure 1 As shown, generator 1' utilizes a permanent magnet synchronous motor. Its rotor 11' is cantilevered and mounted on the output shaft 21' of gearbox 2', with a steel-to-steel connection. In this structure, the rotor 11' of generator 1' lacks bearings 22' on either side. This transfers the common-mode voltage that could cause electrical corrosion in the bearings 22' to the gearbox 2', damaging the bearings 22' mounted on the output shaft 21' and the tooth surfaces 23' of the gearbox 2' and generator 1' adjacent to each other. Furthermore, due to structural limitations, the common-mode voltage in the interface between the rotor 11' and gearbox 2' cannot be measured.

[0004] In the prior art, such as Figure 1As shown, the following solutions are mainly used to reduce shaft voltage and shaft current: first, a carbon brush grounding 13' is used on one side of the rotor bracket 12' at the non-drive end of the generator 1' to ground and conduct the current generated on the rotor 11', thereby reducing the current transmitted by the rotor 11' to the output shaft 21'. However, current still flows into the output shaft 21', which is less effective, and the structure is difficult to maintain and inconvenient to use. Second, the bearing 22' on the output shaft 21' is insulated to prevent damage due to electrical corrosion. However, the insulation layer of the insulated bearing 22' is easily damaged during installation and use, rendering it ineffective. Neither of the above measures can effectively suppress the induced voltage in the output shaft 21' area on the gearbox 2' side. Summary of the Invention

[0005] The purpose of the present invention is to provide a semi-direct drive wind turbine generator set, which reduces the induced voltage in the output shaft area on the gear box side, protects the structure on the gear box from electrical corrosion, and prolongs the service life.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A semi-direct drive wind turbine generator set, comprising:

[0008] a generator comprising a stator base, stator windings, and a rotor assembly;

[0009] a gearbox comprising a housing connected to the stator base and an output shaft rotatably connected to the housing, wherein the output shaft is connected to the rotor assembly;

[0010] A high-frequency grounding strip, through which the box and the stator base are grounded respectively;

[0011] The protection module can reduce the common mode voltage to reduce the shaft current on the output shaft.

[0012] Optionally, the protection module includes a conductive component, which is fixedly disposed between the box and the rotor assembly and can make the box and the rotor assembly conductive.

[0013] Optionally, the box body is provided with a first mounting hole, the output shaft is passed through the first mounting hole, the conductive component includes a conductive ring sleeved on the output shaft, and the outer periphery of the conductive ring is in contact with the first mounting hole.

[0014] Optionally, the conductive ring is in interference connection with the output shaft, and the conductive ring is connected to the output shaft via a first conductive fiber.

[0015] Optionally, the conductive component includes a flange, one end of the flange is fixedly connected to the box, and the other end is provided with a conductive brush, the conductive brush is in contact with the rotor component, and the surface of the conductive brush facing the rotor component is provided with a second conductive fiber.

[0016] Optionally, the box is connected to the stator base, and end surfaces of the box form spacing spaces with the stator base, the stator winding, and the rotor assembly respectively;

[0017] The protection module includes a conductive shell arranged in the separation space. The conductive shell is covered on a side of the box body close to the generator and forms a Faraday cage with the box body.

[0018] Optionally, the shape of the conductive shell is adapted to the shape of the separation space, and one end of the conductive shell is connected to the stator base, and the other end is provided with a through hole, and the rotor assembly is passed through the through hole. An extension portion is provided on the conductive shell, and the extension portion is connected to the box body.

[0019] Optionally, the rotor assembly includes a rotor winding and a rotor bracket connected to the rotor winding, the rotor bracket includes a first bracket connected to the rotor winding and a second bracket connected to the output shaft, the protective module includes an insulating assembly, and the first bracket and the second bracket are insulated and connected by the insulating assembly.

[0020] Optionally, the rotor bracket further includes a fastener, the first bracket and the second bracket are respectively provided with a second mounting hole, and the fastener is passed through the two second mounting holes;

[0021] The insulating assembly includes two insulating pads and an insulating sleeve. The insulating sleeve is sleeved on the fastener and passed through the second mounting hole of the second bracket. One insulating pad is clamped between the first bracket and the second bracket, and the other insulating pad is arranged on the side of the second bracket away from the first bracket.

[0022] Optionally, the protection module includes an insulation unit, and the insulation unit includes:

[0023] A bearing seat having a connecting flange at its end, the connecting flange and the end surface of the housing close to the generator being connected by bolts with hinged holes, the output shaft being rotatably connected to the bearing seat via a bearing, and insulating plywood being respectively provided on the structural intermediate layers of the bearing seat and the connecting flange;

[0024] an insulating gasket, sandwiched between the head of the hinged hole bolt and the connecting flange;

[0025] An insulating sleeve is sleeved on the outer circumference of the hinged hole bolt so that the hinged hole bolt can isolate the bearing seat and the box body respectively.

[0026] Beneficial effects of the present invention:

[0027] The present invention provides a semi-direct-drive wind turbine generator set, which is connected to the housing via a stator base, ensuring stable structural installation. By grounding the housing and stator base separately, the generated current is discharged through the stator base grounding, and the current on the conductive housing is discharged through the grounding. By adding a shunt conduction and grounding derivation structure, the current in the output shaft area can be effectively reduced. By providing a high-frequency grounding strip, the current grounding derivation amount can be increased, further reducing the current in the output shaft area. By providing a protective module, the common-mode voltage caused by the inverter and generator is actively reduced, the shaft current in the output shaft area is reduced, the induced voltage in the output shaft area on the gearbox side is effectively suppressed, and the bearings and gears in the output shaft area are protected. Specifically, the output shaft is rotatably connected to the housing via a bearing, reducing the shaft current in the output shaft, preventing damage to the bearings due to electrical corrosion, and extending the service life of the bearings. The output shaft is provided with a tooth surface, which is meshed with the gears in the gearbox. By reducing the shaft current in the output shaft area, the tooth surface can be prevented from being damaged by electrical corrosion, thereby extending the service life of the tooth surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of a semi-direct drive wind turbine generator set in the prior art;

[0029] Figure 2 is a cross-sectional view of a semi-direct drive wind turbine generator set provided in Example 1 of the present invention;

[0030] Figure 3 yes Figure 2 A local enlarged view of point A;

[0031] Figure 4 is a cross-sectional view of a semi-direct drive wind turbine generator set provided by the second embodiment of the present invention;

[0032] Figure 5 yes Figure 4 A partial enlarged view of point B;

[0033] Figure 6 is a cross-sectional view of a semi-direct drive wind turbine generator set provided by embodiment 3 of the present invention;

[0034] Figure 7 is a cross-sectional view of a semi-direct drive wind turbine generator set provided by the fourth and fifth embodiments of the present invention;

[0035] Figure 8 yes Figure 7 A partial enlarged view of point C;

[0036] Figure 9 yes Figure 7 A partial enlarged view of point D.

[0037] In the picture:

[0038] 1', generator; 11', rotor; 12', rotor bracket; 13', grounding carbon brush; 2', gearbox; 21', output shaft; 22', bearing; 23', tooth surface;

[0039] 1. Generator; 11. Stator base; 12. Stator winding; 13. Rotor assembly; 131. Rotor winding; 132. Rotor bracket; 1321. First bracket; 1322. Second bracket; 1323. Fastener;

[0040] 2. Gearbox; 21. Box body; 211. Transparent cover; 212. End cover; 22. Output shaft; 23. Bearing; 24. Tooth surface;

[0041] 3. High frequency grounding strip;

[0042] 4. Grounding carbon brush;

[0043] 51. First protection module; 511. Conductive ring; 512. First conductive fiber; 52. Second protection module; 521. Flange; 5211. End; 5212. Ring portion; 522. Conductive brush; 523. Second conductive fiber; 53. Third protection module; 531. Conductive shell; 532. Extension portion; 54. Fourth protection module; 541. Insulating pad; 542. Insulating sleeve; 55. Fifth protection module; 551. Bearing seat; 5511. Connecting flange; 5512. Insulating splint; 552. Insulating gasket; 553. Insulating sleeve; 554. Reamed hole bolt. DETAILED DESCRIPTION

[0044] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] Example 1

[0048] This embodiment provides a semi-direct drive wind turbine generator set, such as Figure 2 As shown, it includes a generator 1, a gearbox 2, a high-frequency grounding strip 3 and a protection module; specifically, the generator 1 includes a stator base 11, a stator winding 12 and a rotor assembly 13; the gearbox 2 includes a housing 21 connected to the stator base 11 and an output shaft 22 rotatably connected to the housing 21, and the output shaft 22 is connected to the rotor assembly 13; the housing 21 and the stator base 11 are respectively grounded through the high-frequency grounding strip 3; the protection module can reduce the common mode voltage to reduce the shaft current on the output shaft 22.

[0049] The stator base 11 is connected to the housing 21, ensuring stable structural installation. By grounding the housing 21 and stator base 11 separately, the generated current is discharged through the stator base 11 and the current conducted to the housing 21 is also discharged to the ground. By adding shunt conduction and grounding extraction structures, the current conducted to the output shaft 22 area can be effectively reduced. The provision of a high-frequency grounding strip 3 increases the amount of current conducted to the ground, further reducing the current in the output shaft 22 area. Specifically, the high-frequency grounding strip 3 is existing technology and can be purchased externally, so its further description is omitted.

[0050] By providing a protective module, the common-mode voltage generated by the inverter and generator 1 is actively reduced, reducing the shaft current in the output shaft 22 area, effectively suppressing the induced voltage in the output shaft 22 area on the gearbox 2 side, and protecting the bearings 23 and gears in the output shaft 22 area. Specifically, the output shaft 22 is rotatably connected to the housing 21 via the bearing 23. Reducing the shaft current in the output shaft 22 can prevent damage to the bearing 23 due to electrical corrosion, thereby extending the service life of the bearing 23. The output shaft 22 is provided with a tooth surface 24, which meshes with the gears in the gearbox 2. By reducing the shaft current in the output shaft 22 area, damage to the tooth surface 24 due to electrical corrosion can be prevented, thereby extending the service life of the tooth surface 24.

[0051] Optionally, the protective module includes a conductive component, which is fixedly arranged between the box body 21 and the rotor assembly 13, and can make the box body 21 and the rotor assembly 13 conductive, so that the rotor assembly 13 and the box body 21 are connected to form a loop, further increasing the direct conduction from the rotor assembly 13 to the box body 21, reducing the current in the output shaft 22 area, and thereby protecting structures such as the bearing 23 and the tooth surface 24.

[0052] In this embodiment, Figure 2 and Figure 3 As shown, the housing 21 defines a first mounting hole, through which the output shaft 22 is inserted. The conductive assembly includes a conductive ring 511 sleeved over the output shaft 22. The outer periphery of the conductive ring 511 is in contact with the first mounting hole. The conductive ring 511 can contact the first mounting hole and the output shaft 22, respectively, thereby establishing electrical connection between the output shaft 22 and the housing 21 through the conductive ring 511. A circuit is formed through the stator base 11, the rotor assembly 13, the output shaft 22, the conductive ring 511, and the housing 21. The current on the rotor assembly 13 is conducted to the housing 21 through the output shaft 22 and the conductive ring 511, thereby reducing the current in the area of ​​the output shaft 22. The bearing 23 and the tooth surface 24 are disposed within the housing 21. The first mounting hole is defined in the housing 21, i.e., the conductive ring 511 is disposed on the side of the bearing 23 closest to the rotor assembly 13. This effectively reduces the current in the area of ​​the output shaft 22, thereby reducing electrical corrosion of the bearing 23 and the tooth surface 24. More specifically, the housing 21 includes a housing body, a transparent cover 211 mounted on the housing body, and an end cap 212 mounted on the transparent cover 211. The end cap 212 has a first mounting hole. Current flows sequentially through the rotor assembly 13, the output shaft 22, the conductive ring 511, the end cap 212, the transparent cover 211, and the housing body, ultimately grounding the housing body. In this embodiment, the conductive ring 511 and the first conductive fiber 512 form the first protective module 51.

[0053] Specifically, the conductive ring 511 is connected to the output shaft 22 in an interference fit manner, which improves the contact reliability between the conductive ring 511 and the output shaft 22, thereby increasing the current conduction to the conductive ring 511. The conductive ring 511 is connected to the output shaft 22 via the first conductive fiber 512, further improving the conduction effect.

[0054] Specifically, if Figure 2 and Figure 3 As shown, the rotor assembly 13 includes a rotor winding 131 and a rotor bracket 132. The rotor bracket 132 is connected to the output shaft 22, so that the rotor winding 131, the rotor bracket 132, the output shaft 22, the conductive ring 511, the box 21 and the stator base 11 can be conductive. The box 21 and the stator base 11 are grounded through the high-frequency grounding belt 3.

[0055] Alternatively, as Figure 2 As shown, the non-drive side of the generator 1 is grounded using a grounding carbon brush 4 through a high-frequency grounding belt 3 to reduce the current in the output shaft 22 area.

[0056] Optionally, the bearing 23 may also be an insulating bearing 23 for further protection.

[0057] Example 2

[0058] like Figure 4 and Figure 5 As shown, this embodiment provides a semi-direct-drive wind turbine generator set, and the overall structure of the semi-direct-drive wind turbine generator set provided by this embodiment is basically the same as that of the semi-direct-drive wind turbine generator set in Example 1, with only the setting of the conductive components being different. This embodiment will no longer repeat the structure that is the same as that in Example 1.

[0059] This embodiment differs from the first embodiment in that the conductive assembly includes a flange 521, one end of which is fixedly connected to the housing 21 and the other end is provided with a conductive brush 522. The conductive brush 522 is in contact with the rotor assembly 13, and the surface of the conductive brush 522 facing the rotor assembly 13 is provided with a second conductive fiber 523. A circuit is formed by the stator base 11, the rotor assembly 13, the second conductive fiber 523, the conductive brush 522, the flange 521, and the housing 21, enabling electrical continuity and reducing the current in the area of ​​the output shaft 22. In this embodiment, the rotor winding 131, the rotor bracket 132, the second conductive fiber 523, the conductive brush 522, the flange 521, the housing 21, and the stator base 11 are electrically connected, and the housing 21 and the stator base 11 are grounded via the high-frequency grounding strap 3. In this embodiment, the flange 521, the conductive brush 522, and the second conductive fiber 523 module form the second protection module 52.

[0060] In this embodiment, the box body 21 includes a box body and a transparent cover 211. Specifically, the flange 521 includes an annular portion 5212 and an end portion 5211 that are connected to each other. The annular portion 5212 is connected to the transparent cover 211. Four to six conductive brushes 522 are evenly installed on the surface of the end portion 5211. Conductive fibers are installed on the surface of the conductive brushes 522. The conductive brushes 522 form surface-to-surface contact with the column bracket to increase the conductivity.

[0061] Example 3

[0062] like Figure 6 As shown, this embodiment provides a semi-direct-drive wind turbine generator set, and the overall structure of the semi-direct-drive wind turbine generator set provided by this embodiment is basically the same as that of the semi-direct-drive wind turbine generator set in Example 1, with only the setting of the protection module being different. This embodiment will no longer repeat the structure that is the same as that in Example 1.

[0063] This embodiment differs from the first and second embodiments in that the housing 21 is connected to the stator base 11, with the end faces of the housing 21 forming a space between the stator base 11, the stator winding 12, and the rotor assembly 13. The protective module includes a conductive housing 531 disposed within the space. The conductive housing 531 covers the side of the housing 21 closest to the generator 1 and forms a Faraday cage with the housing 21. This isolates the gearbox 2 from the electromagnetic field on the generator 1 side and suppresses shaft current on the output shaft 22. In this embodiment, the conductive housing 531 forms the third protective module 53.

[0064] Specifically, the shape of the conductive housing 531 adapts to the shape of the compartment. One end of the conductive housing 531 is connected to the stator base 11, and the other end defines a through-hole through which the rotor assembly 13 is inserted. An extension 532 is provided on the conductive housing 531, which is connected to the housing 21. The extension 532 and one end of the conductive housing 531 are connected to the housing 21 and the stator base 11, respectively, to form the housing. The through-hole facilitates connection between the rotor assembly 13 and the output shaft 22. In this embodiment, the through-hole is adapted to the size of the rotor assembly 13 to avoid overly large openings that would reduce performance.

[0065] In this embodiment, the conductive housing 531 may be an aluminum housing.

[0066] Example 4

[0067] like Figure 7 and Figure 8 As shown, this embodiment provides a semi-direct-drive wind turbine generator set, and the overall structure of the semi-direct-drive wind turbine generator set provided by this embodiment is basically the same as that of the semi-direct-drive wind turbine generator set in Example 1, with only the setting of the protection module being different. This embodiment will no longer repeat the structure that is the same as that in Example 1.

[0068] This embodiment differs from Embodiments 1 to 3 in that the rotor assembly 13 includes a rotor winding 131 and a rotor bracket 132 connected to the rotor winding 131. The rotor bracket 132 includes a first bracket 1321 connected to the rotor winding 131 and a second bracket 1322 connected to the output shaft 22. The protective module includes an insulating component, and the first bracket 1321 and the second bracket 1322 are insulated from each other by the insulating component. The insulation isolation of the first bracket 1321 and the second bracket 1322 achieves forced insulation isolation between the output shaft 22 and the rotor winding 131, reducing the current in the area of ​​the output shaft 22. In this embodiment, the insulating component forms the fourth protective module 54.

[0069] Optionally, the rotor bracket 132 also includes a fastener 1323, the first bracket 1321 and the second bracket 1322 are respectively provided with a second mounting hole, the fastener 1323 is passed through the two second mounting holes, the insulating component includes two insulating pads 541 and an insulating sleeve 542, the insulating sleeve 542 is sleeved on the fastener 1323, and the insulating sleeve 542 is passed through the second mounting hole of the second bracket 1322, one insulating pad 541 is clamped between the first bracket 1321 and the second bracket 1322, and the other insulating pad 541 is arranged on the side of the second bracket 1322 away from the first bracket 1321, and the second bracket 1322 is insulated and connected to the first bracket 1321 through the insulating sleeve 542 and the two insulating pads 541. In this embodiment, the fastener 1323 includes a bolt and a nut. The bolt is passed through the two second mounting holes and then connected with the nut to connect the first bracket 1321 and the second bracket 1322. The two insulating pads 541 respectively have a third mounting hole. The bolt is passed through the two third mounting holes to connect the two insulating pads 541, so that the first insulating pad 541 is connected between the first bracket 1321 and the second bracket 1322, and the second insulating pad 541 is connected between the second bracket 1322 and the nut.

[0070] Example 5

[0071] This embodiment provides a semi-direct-drive wind turbine generator set, and the overall structure of the semi-direct-drive wind turbine generator set provided in this embodiment is basically the same as that of the semi-direct-drive wind turbine generator set in Example 1, with only the setting of the protection module being different. This embodiment will no longer repeat the structure that is the same as that in Example 1.

[0072] like Figure 7 and Figure 9As shown, the difference between this embodiment and the first to fourth embodiments is that the protection module includes an insulating unit, which includes a bearing seat 551, an insulating gasket 552 and an insulating sleeve 553. Specifically, the end of the bearing seat 551 has a connecting flange 5511, and the connecting flange 5511 is connected to the end surface of the housing 21 on the side close to the generator 1 by a hinged hole bolt 554. The output shaft 22 is rotatably connected to the bearing seat 551 through the bearing 23. Insulating clamping plates 5512 are respectively provided on the structural intermediate layer of the bearing seat 551 and the connecting flange 5511. The insulating gasket 552 is sandwiched between the head of the hinged hole bolt 554 and the connecting flange 5511; the insulating sleeve 553 is sleeved on the outer periphery of the hinged hole bolt 554 so that the hinged hole bolt 554 can be isolated from the bearing seat 551 and the housing 21 respectively; by providing the insulating sleeve 553 and the insulating gasket 552, the hinged hole bolt 554 is insulated from the connecting flange 5511, the bearing seat 551 and the housing 21 respectively; an insulating splint 5512 is provided on the structural intermediate layer of the bearing seat 551 and the connecting flange 5511 to further insulate the bearing 23. Specifically, the insulating splint 5512 can also be replaced with an insulating film, which is a prior art and will not be described in detail; or an insulating material can be applied to the bearing seat 551, which will not be described in detail; by providing the above-mentioned bearing seat 551, the insulation isolation between the bearing 23 and the housing 21 can be achieved, so that it can be protected. In this embodiment, the insulating unit forms the fifth protection module 55. The fifth protection module 55 in the fifth embodiment and the fourth protection module 54 in the fourth embodiment can be used either selectively or simultaneously.

[0073] Example 6

[0074] This embodiment provides a semi-direct-drive wind turbine generator set, and the overall structure of the semi-direct-drive wind turbine generator set provided by this embodiment is basically the same as that of the semi-direct-drive wind turbine generator set in Example 1. This embodiment will not repeat the structure that is the same as that in Example 1.

[0075] The difference between this embodiment and embodiments 1 to 5 is that, among the five schemes of the first protection module 51 in embodiment 1, the second protection module 52 in embodiment 2, the third protection module 53 in embodiment 3, the fourth protection module 54 in embodiment 4 and the fifth protection module 55 in embodiment 5, the protective film group of the semi-direct drive component generator set in this embodiment can be a combination of any two, any three or any four schemes of the first protection module 51, the second protection module 52, the third protection module 53, the fourth protection module 54 and the fifth protection module 55, or the above five schemes can be set at the same time. Some structures can be adjusted accordingly according to actual conditions and will not be repeated here. Specifically, when the five schemes of embodiments 1 to 5 are respectively adopted, the structure is simple and the cost is low; when the combined scheme is adopted, the reliability is higher.

[0076] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A semi-direct drive wind turbine generator set, characterized in that: include: A generator (1) comprising a stator base (11), a stator winding (12) and a rotor assembly (13); A gearbox (2) comprising a housing (21) connected to the stator base (11) and an output shaft (22) rotatably connected to the housing (21), wherein the output shaft (22) is connected to the rotor assembly (13); A high-frequency grounding strip (3), wherein the box (21) and the stator base (11) are grounded respectively through the high-frequency grounding strip (3); A protection module capable of reducing the common mode voltage to reduce the shaft current on the output shaft (22); The box body (21) is connected to the stator base (11), and end surfaces of the box body (21) respectively form spacing spaces with the stator base (11), the stator winding (12), and the rotor assembly (13); The protective module comprises a conductive shell (531) arranged in the separation space, wherein the conductive shell (531) is an aluminum shell, and the conductive shell (531) is covered on a side of the box (21) close to the generator (1) and forms a Faraday cage with the box (21).

2. The semi-direct drive wind turbine generator set according to claim 1, characterized in that: The outer shape of the conductive shell (531) is adapted to the shape of the separation space, and one end of the conductive shell (531) is connected to the stator base (11), and the other end is provided with a through hole, and the rotor assembly (13) is passed through the through hole. The conductive shell (531) is provided with an extension portion (532), and the extension portion (532) is connected to the box body (21).

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