A permanent magnet direct-drive wind turbine motor outer rotor magnetic steel demagnetization system and method

Abstract

The present invention discloses a permanent magnet direct-drive wind turbine motor outer rotor magnetic steel demagnetization system and method, belonging to the field of wind turbine assembly technology. The demagnetization system includes a controller, a first demagnetization coil module, a first vertical slide rail bracket, a first hydraulic support column, a rotating rocker arm bracket, a rotating shaft system component, a turning gear, a servo motor, a second hydraulic support column, a second vertical slide rail bracket, a second demagnetization coil module, a demagnetization current generator and a fixed base. One end of the rotating rocker arm bracket is connected to the first hydraulic support column, and the other end is connected to the second hydraulic support column. The turning gear is arranged on the rotating shaft system component, the turning gear is connected to the servo motor, and the first demagnetization coil module and the second demagnetization coil module are respectively connected to the demagnetization current generator. The demagnetization system of the present invention can obtain real-time feedback on the demagnetization effect and automatically optimize the demagnetization parameters, thereby improving the demagnetization quality and consistency.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine assembly, and in particular to a permanent magnet direct-drive wind turbine outer rotor magnetic steel demagnetization system and method. Background Art

[0002] Existing permanent magnet direct-drive wind turbines typically utilize an outer rotor and inner stator structure. The rotor is assembled by attaching permanent magnets to the inner wall of the outer rotor frame to form rows of magnetic poles. If the magnets are not demagnetized before the rotor is repaired or recycled, the strong magnetism of the permanent magnets makes removal extremely difficult and cumbersome. This requires the design and use of specialized tooling, and poses safety risks during handling.

[0003] Regarding the overall demagnetization of the outer rotor, due to the large structure of the direct-drive wind turbine rotor, the existing demagnetization methods of oxyacetylene flame or furnace heating have many problems such as long heating time, high energy consumption, large environmental pollution and large losses. In addition, the rotor base will be difficult or impossible to reuse due to deformation.

[0004] The Chinese patent document with publication number CN118588398A and publication date September 3, 2024 discloses a permanent magnet motor charging and demagnetization system and method. The charging and demagnetization system includes a permanent magnet motor body, a base plate, a transport component, a demagnetization component and a magnetization component. The transport component is arranged on the top of the base plate, the demagnetization component is arranged on the top of the transport component, and the magnetization component is arranged on the top of the base plate; the magnetization component includes a magnetization frame fixedly mounted on the top of the base plate, an arc-shaped groove is opened on the top of the magnetization frame, a magnetization annular plate is fixedly mounted in the arc-shaped groove, a magnetization coil is wound on the outer surface of the magnetization annular plate, a positive plate is fixedly mounted on one end of the magnetization annular plate, and a negative plate is fixedly mounted on the other end of the magnetization annular plate, the positive plate is connected to one end of the magnetization coil, and the negative plate is connected to the other end of the magnetization coil, and a magnetization box is provided on the front side of the magnetization frame.

[0005] The permanent magnet motor charging and demagnetization system and method disclosed in this patent improve the system's magnetization and demagnetization efficiency without affecting the permanent magnet motor assembly process, reducing maintenance costs and pollution. However, the demagnetization effect is uneven and inconsistent, and the demagnetization parameters cannot be adjusted based on feedback from the demagnetization situation. This results in a high level of residual magnetism and poor demagnetization quality, making automated demagnetization impossible and requiring human intervention. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a permanent magnet direct-drive wind turbine motor outer rotor magnetic steel demagnetization system and method. The demagnetization system of the present invention can obtain real-time feedback on the demagnetization effect and automatically optimize the demagnetization parameters, thereby improving the demagnetization quality and consistency.

[0007] The present invention is achieved through the following technical solutions:

[0008] A permanent magnet direct-drive wind turbine outer rotor magnetic steel demagnetization system includes a controller, a first demagnetization coil module, a first vertical slide rail bracket, a first hydraulic support column, a rotating rocker arm bracket, a rotating shaft system assembly, a turning gear, a servo motor, a second hydraulic support column, a second vertical slide rail bracket, a second demagnetization coil module, a demagnetization current generator and a fixed base. One end of the rotating rocker arm bracket is connected to the first hydraulic support column, the other end of the rotating rocker arm bracket is connected to the second hydraulic support column, the upper end of the rotating shaft system assembly is connected to the middle part of the rotating rocker arm bracket, the lower end of the rotating shaft system assembly is fixedly connected to the fixed base, and the turning gear is connected to the second hydraulic support column. The turning gear is arranged on the rotating shaft system assembly, the turning gear is connected to the servo motor, the first vertical slide rail bracket, the first hydraulic support column, the second vertical slide rail bracket, the second hydraulic support column, the demagnetization current generator and the servo motor are electrically connected to the controller respectively, the first demagnetization coil module and the second demagnetization coil module are connected to the demagnetization current generator respectively, the first demagnetization coil module is slidably connected to the first vertical slide rail bracket, the first vertical slide rail bracket is fixedly connected to the first hydraulic support column, the second demagnetization coil module is slidably connected to the second vertical slide rail bracket, and the second vertical slide rail bracket is fixedly connected to the second hydraulic support column.

[0009] The first demagnetization coil module performs horizontal reciprocating motion under the action of the first hydraulic support column.

[0010] The second demagnetization coil module performs horizontal reciprocating motion under the action of the second hydraulic support column.

[0011] The rotating shaft system assembly includes a fixed shaft, a bearing and a rotating shaft. The bearing is arranged between the fixed shaft and the rotating shaft. The fixed shaft is fixedly connected to the fixed base, and the rotating shaft is fixedly connected to the rotating rocker arm bracket.

[0012] There are two bearings, one bearing is located on the upper part of the fixed shaft, and the other bearing is located on the lower part of the fixed shaft.

[0013] The servo motor includes a motor shaft and an output gear, and the output gear is fixedly arranged at the end of the motor shaft.

[0014] The turning gear and the output gear of the servo motor are both bevel gears. The turning gear and the servo motor are connected through gear meshing, and the turning gear is sleeved on the rotating shaft.

[0015] The first demagnetization coil module includes a first bracket, a first surface magnetic detector for collecting surface magnetic data, a first magnetic field coil for demagnetization, and a first cooling pipe arranged in the first magnetic field coil for heat dissipation of the first magnetic field coil. The first magnetic field coil is arranged inside the first bracket, the first surface magnetic detector is fixed on the surface of the first bracket, and the first surface magnetic detector is electrically connected to the controller.

[0016] The second demagnetization coil module includes a second bracket, a second surface magnetic detector for collecting surface magnetic data, a second magnetic field coil for demagnetization, and a second cooling pipe arranged in the second magnetic field coil for heat dissipation of the second magnetic field coil. The second magnetic field coil is arranged inside the second bracket, the second surface magnetic detector is fixed on the surface of the second bracket, and the second surface magnetic detector is electrically connected to the controller.

[0017] The demagnetization current generator is connected to the first magnetic field coil and the second magnetic field coil respectively, and is used to input demagnetization current to the first magnetic field coil and the second magnetic field coil.

[0018] A method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine motor comprises the following steps:

[0019] S1. Fix the outer rotor on a fixed base, and detect the current magnetic pole position and surface magnetic data using a first surface magnetic detector and a second surface magnetic detector respectively;

[0020] S2. Adjusting the vertical and radial positions of the first demagnetization coil module and the second demagnetization coil module respectively according to the magnetic pole positions, so that the first demagnetization coil module and the second demagnetization coil module respectively contact and cover corresponding magnetic poles;

[0021] S3, the demagnetization current generator applies a directional demagnetization current to the first magnetic field coil in the first demagnetization coil module and the second magnetic field coil in the second demagnetization coil module respectively arranged opposite to each other based on the magnetic polarity;

[0022] S4, increasing the demagnetization peak voltage of the demagnetization current generator in stages, and cyclically executing detection, demagnetization, and surface magnetic data comparison until the surface magnetic data does not change, and determining the complete demagnetization voltage;

[0023] S5, demagnetizing the remaining magnetic poles according to the demagnetization angle step according to the complete demagnetization voltage;

[0024] S6. After demagnetization is completed, perform surface magnetic detection on all magnetic poles in the circumferential direction of the rotor, and increase the voltage to compensate for the magnetic poles that have not been demagnetized until all magnetic poles are demagnetized.

[0025] In the above-mentioned S3, the demagnetization current is a unidirectional pulse current.

[0026] In S3, applying a directional demagnetization current means that if the polarity of the magnetic pole corresponding to the first demagnetization coil module is the same as the polarity of the magnetic pole corresponding to the second demagnetization coil module, the demagnetization current is applied in the same direction; if the polarity is opposite, the demagnetization current is applied in the opposite direction.

[0027] The inner axial lengths of the first magnetic field coil and the second magnetic field coil are both 0-50 mm longer than the axial lengths of the magnetic poles of the rotor.

[0028] The inner circumferential widths of the first magnetic field coil and the second magnetic field coil are both 0-10 mm larger than the circumferential width of the magnetic poles of the rotor.

[0029] The outer circumferential widths of the first magnetic field coil and the second magnetic field coil are at least 10 mm smaller than the sum of the widths of a single magnetic pole of the rotor and the gaps between adjacent magnetic poles.

[0030] The beneficial effects of the present invention are mainly manifested in the following aspects:

[0031] 1. The present invention adopts a specific structure of "one end of the rotating rocker arm bracket is connected to the first hydraulic support column, the other end of the rotating rocker arm bracket is connected to the second hydraulic support column, the upper end of the rotating shaft system assembly is connected to the middle of the rotating rocker arm bracket, the lower end of the rotating shaft system assembly is fixedly connected to the fixed base, the winch gear is arranged on the rotating shaft system assembly, the winch gear is connected to the servo motor, the first vertical slide rail bracket, the first hydraulic support column, the second vertical slide rail bracket, the second hydraulic support column, the demagnetization current generator and the servo motor are respectively electrically connected to the controller, the first demagnetization coil module and the second demagnetization coil module are respectively connected to the demagnetization current generator, the first demagnetization coil module is slidably connected to the first vertical slide rail bracket, the first vertical slide rail bracket is fixedly connected to the first hydraulic support column, the second demagnetization coil module is slidably connected to the second vertical slide rail bracket, and the second vertical slide rail bracket is fixedly connected to the second hydraulic support column". Compared with the existing technology, the demagnetization system can obtain demagnetization effect feedback in real time and automatically optimize the demagnetization parameters, thereby improving the demagnetization quality and consistency.

[0032] 2. The present invention, through the collaborative work of the demagnetization coil module and the controller, can obtain real-time feedback on the demagnetization effect and automatically optimize the demagnetization parameters, greatly improving the accuracy and efficiency of demagnetization, reducing manual intervention and trial-and-error costs, and making the entire demagnetization system more intelligent and efficient.

[0033] 3. In view of the stress conditions during demagnetization of the outer rotor, the present invention specifically adopts a structure in which hydraulic support columns, vertical slide rail supports and demagnetization coil modules are symmetrically arranged on both sides of the rotating rocker arm support, effectively resisting the influence of the strong electromagnetic force generated during the demagnetization process and ensuring the reliability and stability of the demagnetization system under long-term operation.

[0034] 4. In the present invention, the residual magnetism data collected by the demagnetization coil module during the demagnetization process can be used for subsequent tracing, quality control and research analysis, providing strong support for the full life cycle management of the product.

[0035] 5. The demagnetization method of the present invention, through the steps of automatic positioning, step-by-step demagnetization, and gradual parameter optimization, can more accurately demagnetize each magnetic pole and supplementally demagnetize the incompletely demagnetized portions until all magnetic poles are completely demagnetized. This refined demagnetization operation, combined with the optimization and adjustment of demagnetization parameters, can ensure the best demagnetization effect and avoid the problems of incomplete demagnetization or excessive demagnetization that may occur in the prior art.

[0036] 6. Compared with the prior art, the demagnetization method of the present invention improves the demagnetization quality and consistency, which is of great significance for the subsequent rotor maintenance and recycling.

[0037] 7. In the present invention, the inner axial lengths of the first and second magnetic field coils are 0-50mm longer than the axial lengths of the rotor's magnetic poles. The magnetic field coils adopt this specific axial length redundancy design. Through physical covering and coordinated optimization of the electromagnetic field, while ensuring the thoroughness of demagnetization, the system's compatibility with rotors of different specifications and stability under harsh working conditions are significantly improved. Measured data show that for magnetic poles with an axial length of 500mm, the use of a 30mm redundant magnetic field coil design can improve the axial uniformity of the magnetic poles after demagnetization by 40%, and the demagnetization pass rate in the edge area is increased from 92% to 99.5%. At the same time, the maintenance frequency is reduced by about 30%, solving the "edge effect" problem that is prevalent in the demagnetization of large permanent magnet direct-drive wind turbines, and providing a guarantee for long-cycle operation and maintenance scenarios such as offshore wind power.

[0038] 8. In the present invention, the inner circumferential widths of the first magnetic field coil and the second magnetic field coil are 0-10 mm larger than the circumferential width of the rotor's magnetic poles. This specific circumferential width ratio achieves full magnetic field coverage and eliminates edge magnetic leakage, which can ensure the demagnetization effect of the magnetic poles while reducing energy consumption.

[0039] 9. In the present invention, the outer circumferential widths of the first magnetic field coil and the second magnetic field coil are both at least 10 mm smaller than the sum of the widths of a single rotor pole and the gaps between adjacent magnetic poles. By making the outer circumferential widths of the magnetic field coils at least 10 mm smaller than the sum of the poles and the gaps, the demagnetization magnetic field can be precisely focused, magnetic field crosstalk between adjacent magnetic poles can be avoided, and the demagnetization range can be strictly limited to the target magnetic pole. This can not only ensure the demagnetization effect of the magnetic pole, but also prevent the adjacent opposite magnetic poles from being mistakenly magnetized. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0041] Figure 1 Schematic diagram of the structure of the demagnetization system of the present invention;

[0042] Figure 2 A partial side view of the demagnetization system of the present invention;

[0043] Figure 3 Schematic diagram of the structure of the first demagnetization coil module of the present invention;

[0044] Figure 4 for Figure 3 AA view;

[0045] Figure 5 Schematic diagram of the structure of the second demagnetization coil module of the present invention;

[0046] Figure 6 for Figure 5 BB view;

[0047] Figure 7 A schematic diagram of the magnetic pole size of the magnetic pole coil and the rotor of the present invention;

[0048] Markings in the figure: 1. controller, 2. first demagnetization coil module, 3. first vertical slide rail bracket, 4. first hydraulic support column, 5. rotating rocker arm bracket, 6. rotating shaft assembly, 7. turning gear, 8. servo motor, 9. second hydraulic support column, 10. second vertical slide rail bracket, 11. second demagnetization coil module, 12. demagnetization current generator, 13. fixed base, 14. fixed axis, 15. bearing, 16. rotating shaft, 17. motor shaft, 18. output gear, 19. first surface magnetic detector, 20. first magnetic field coil, 21. first cooling pipeline, 22. second surface magnetic detector, 23. second magnetic field coil, 24. second cooling pipeline, 25. first bracket, 26. second bracket;

[0049] X1, the circumferential width of the rotor's magnetic poles, X2, the inner circumferential width of the magnetic field coil, X3, the outer circumferential width of the magnetic field coil, X4, the sum of the widths of a single rotor pole and the gaps between adjacent magnetic poles, Y1, the axial length of the rotor's magnetic poles, Y2, the inner axial length of the magnetic field coil, S and N are both magnetic poles. DETAILED DESCRIPTION

[0050] Example 1

[0051] See also Figure 1 and Figure 2A permanent magnet direct-drive wind turbine outer rotor magnetic steel demagnetization system includes a controller 1, a first demagnetization coil module 2, a first vertical slide rail bracket 3, a first hydraulic support column 4, a rotating rocker arm bracket 5, a rotating shaft assembly 6, a turning gear 7, a servo motor 8, a second hydraulic support column 9, a second vertical slide rail bracket 10, a second demagnetization coil module 11, a demagnetization current generator 12 and a fixed base 13. One end of the rotating rocker arm bracket 5 is connected to the first hydraulic support column 4, and the other end of the rotating rocker arm bracket 5 is connected to the second hydraulic support column 9. The upper end of the rotating shaft assembly 6 is connected to the middle part of the rotating rocker arm bracket 5, and the lower end of the rotating shaft assembly 6 is fixedly connected to the fixed base 13. The turning gear The gear 7 is arranged on the rotating shaft system assembly 6, the turning gear 7 is connected to the servo motor 8, the first vertical slide rail bracket 3, the first hydraulic support column 4, the second vertical slide rail bracket 10, the second hydraulic support column 9, the demagnetization current generator 12 and the servo motor 8 are respectively electrically connected to the controller 1, the first demagnetization coil module 2 and the second demagnetization coil module 11 are respectively connected to the demagnetization current generator 12, the first demagnetization coil module 2 is slidingly connected to the first vertical slide rail bracket 3, the first vertical slide rail bracket 3 is fixedly connected to the first hydraulic support column 4, the second demagnetization coil module 11 is slidingly connected to the second vertical slide rail bracket 10, and the second vertical slide rail bracket 10 is fixedly connected to the second hydraulic support column 9.

[0052] This embodiment is the most basic implementation method. One end of the rotating rocker arm bracket 5 is connected to the first hydraulic support column 4, and the other end of the rotating rocker arm bracket 5 is connected to the second hydraulic support column 9. The upper end of the rotating shaft assembly 6 is connected to the middle part of the rotating rocker arm bracket 5, and the lower end of the rotating shaft assembly 6 is fixedly connected to the fixed base 13. The turning gear 7 is set on the rotating shaft assembly 6, and the turning gear 7 is connected to the servo motor 8. The first vertical slide rail bracket 3, the first hydraulic support column 4, the second vertical slide rail bracket 10, the second hydraulic support column 9, the demagnetization current generator 12 and the servo motor 8 They are electrically connected to the controller 1 respectively, the first demagnetization coil module 2 and the second demagnetization coil module 11 are connected to the demagnetization current generator 12 respectively, the first demagnetization coil module 2 is slidably connected to the first vertical slide rail bracket 3, the first vertical slide rail bracket 3 is fixedly connected to the first hydraulic support column 4, the second demagnetization coil module 11 is slidably connected to the second vertical slide rail bracket 10, and the second vertical slide rail bracket 10 is fixedly connected to the second hydraulic support column 9. Compared with the existing technology, the demagnetization system can obtain demagnetization effect feedback in real time and automatically optimize the demagnetization parameters, thereby improving the demagnetization quality and consistency.

[0053] Example 2

[0054] See also Figure 1 and Figure 2A permanent magnet direct-drive wind turbine outer rotor magnetic steel demagnetization system includes a controller 1, a first demagnetization coil module 2, a first vertical slide rail bracket 3, a first hydraulic support column 4, a rotating rocker arm bracket 5, a rotating shaft assembly 6, a turning gear 7, a servo motor 8, a second hydraulic support column 9, a second vertical slide rail bracket 10, a second demagnetization coil module 11, a demagnetization current generator 12 and a fixed base 13. One end of the rotating rocker arm bracket 5 is connected to the first hydraulic support column 4, and the other end of the rotating rocker arm bracket 5 is connected to the second hydraulic support column 9. The upper end of the rotating shaft assembly 6 is connected to the middle part of the rotating rocker arm bracket 5, and the lower end of the rotating shaft assembly 6 is fixedly connected to the fixed base 13. The turning gear The gear 7 is arranged on the rotating shaft system assembly 6, the turning gear 7 is connected to the servo motor 8, the first vertical slide rail bracket 3, the first hydraulic support column 4, the second vertical slide rail bracket 10, the second hydraulic support column 9, the demagnetization current generator 12 and the servo motor 8 are respectively electrically connected to the controller 1, the first demagnetization coil module 2 and the second demagnetization coil module 11 are respectively connected to the demagnetization current generator 12, the first demagnetization coil module 2 is slidingly connected to the first vertical slide rail bracket 3, the first vertical slide rail bracket 3 is fixedly connected to the first hydraulic support column 4, the second demagnetization coil module 11 is slidingly connected to the second vertical slide rail bracket 10, and the second vertical slide rail bracket 10 is fixedly connected to the second hydraulic support column 9.

[0055] Preferably, the first demagnetization coil module 2 performs horizontal reciprocating motion under the action of the first hydraulic support column 4 .

[0056] The second demagnetization coil module 11 performs horizontal reciprocating motion under the action of the second hydraulic support column 9 .

[0057] The rotating shaft assembly 6 includes a fixed shaft 14 , a bearing 15 and a rotating shaft 16 . The bearing 15 is arranged between the fixed shaft 14 and the rotating shaft 16 . The fixed shaft 14 is fixedly connected to the fixed base 13 , and the rotating shaft 16 is fixedly connected to the rotating rocker arm bracket 5 .

[0058] This embodiment is a preferred implementation method. Through the collaborative work of the demagnetization coil module and the controller 1, real-time feedback on the demagnetization effect can be obtained, and the demagnetization parameters can be automatically optimized, which greatly improves the accuracy and efficiency of demagnetization, reduces manual intervention and trial and error costs, and makes the entire demagnetization system more intelligent and efficient.

[0059] Example 3

[0060] See also Figure 1 and Figure 2A permanent magnet direct-drive wind turbine outer rotor magnetic steel demagnetization system includes a controller 1, a first demagnetization coil module 2, a first vertical slide rail bracket 3, a first hydraulic support column 4, a rotating rocker arm bracket 5, a rotating shaft assembly 6, a turning gear 7, a servo motor 8, a second hydraulic support column 9, a second vertical slide rail bracket 10, a second demagnetization coil module 11, a demagnetization current generator 12 and a fixed base 13. One end of the rotating rocker arm bracket 5 is connected to the first hydraulic support column 4, and the other end of the rotating rocker arm bracket 5 is connected to the second hydraulic support column 9. The upper end of the rotating shaft assembly 6 is connected to the middle part of the rotating rocker arm bracket 5, and the lower end of the rotating shaft assembly 6 is fixedly connected to the fixed base 13. The turning gear The gear 7 is arranged on the rotating shaft system assembly 6, the turning gear 7 is connected to the servo motor 8, the first vertical slide rail bracket 3, the first hydraulic support column 4, the second vertical slide rail bracket 10, the second hydraulic support column 9, the demagnetization current generator 12 and the servo motor 8 are respectively electrically connected to the controller 1, the first demagnetization coil module 2 and the second demagnetization coil module 11 are respectively connected to the demagnetization current generator 12, the first demagnetization coil module 2 is slidingly connected to the first vertical slide rail bracket 3, the first vertical slide rail bracket 3 is fixedly connected to the first hydraulic support column 4, the second demagnetization coil module 11 is slidingly connected to the second vertical slide rail bracket 10, and the second vertical slide rail bracket 10 is fixedly connected to the second hydraulic support column 9.

[0061] The first demagnetization coil module 2 performs horizontal reciprocating motion under the action of the first hydraulic support column 4 .

[0062] The second demagnetization coil module 11 performs horizontal reciprocating motion under the action of the second hydraulic support column 9 .

[0063] The rotating shaft assembly 6 includes a fixed shaft 14 , a bearing 15 and a rotating shaft 16 . The bearing 15 is arranged between the fixed shaft 14 and the rotating shaft 16 . The fixed shaft 14 is fixedly connected to the fixed base 13 , and the rotating shaft 16 is fixedly connected to the rotating rocker arm bracket 5 .

[0064] There are two bearings 15 , one bearing 15 is located above the fixed shaft 14 , and the other bearing 15 is located below the fixed shaft 14 .

[0065] The servo motor 8 includes a motor shaft 17 and an output gear 18 . The output gear 18 is fixedly disposed at the end of the motor shaft 17 .

[0066] The turning gear 7 and the output gear 18 of the servo motor 8 are both bevel gears. The turning gear 7 and the servo motor 8 are connected through gear meshing. The turning gear 7 is sleeved on the rotating shaft 16.

[0067] This embodiment is another preferred implementation method. In view of the stress conditions during demagnetization of the outer rotor, a structure in which hydraulic support columns, vertical slide rail supports and demagnetization coil modules are symmetrically arranged on both sides of the rotating rocker arm support 5 is specifically adopted. This effectively resists the influence of the strong electromagnetic force generated during the demagnetization process and ensures the reliability and stability of the demagnetization system under long-term operation.

[0068] Example 4

[0069] See also Figures 1-6 A permanent magnet direct-drive wind turbine outer rotor magnetic steel demagnetization system includes a controller 1, a first demagnetization coil module 2, a first vertical slide rail bracket 3, a first hydraulic support column 4, a rotating rocker arm bracket 5, a rotating shaft assembly 6, a turning gear 7, a servo motor 8, a second hydraulic support column 9, a second vertical slide rail bracket 10, a second demagnetization coil module 11, a demagnetization current generator 12 and a fixed base 13. One end of the rotating rocker arm bracket 5 is connected to the first hydraulic support column 4, and the other end of the rotating rocker arm bracket 5 is connected to the second hydraulic support column 9. The upper end of the rotating shaft assembly 6 is connected to the middle part of the rotating rocker arm bracket 5, and the lower end of the rotating shaft assembly 6 is fixedly connected to the fixed base 13. The turning gear The gear 7 is arranged on the rotating shaft system assembly 6, the turning gear 7 is connected to the servo motor 8, the first vertical slide rail bracket 3, the first hydraulic support column 4, the second vertical slide rail bracket 10, the second hydraulic support column 9, the demagnetization current generator 12 and the servo motor 8 are respectively electrically connected to the controller 1, the first demagnetization coil module 2 and the second demagnetization coil module 11 are respectively connected to the demagnetization current generator 12, the first demagnetization coil module 2 is slidingly connected to the first vertical slide rail bracket 3, the first vertical slide rail bracket 3 is fixedly connected to the first hydraulic support column 4, the second demagnetization coil module 11 is slidingly connected to the second vertical slide rail bracket 10, and the second vertical slide rail bracket 10 is fixedly connected to the second hydraulic support column 9.

[0070] The first demagnetization coil module 2 performs horizontal reciprocating motion under the action of the first hydraulic support column 4 .

[0071] The second demagnetization coil module 11 performs horizontal reciprocating motion under the action of the second hydraulic support column 9 .

[0072] The rotating shaft assembly 6 includes a fixed shaft 14 , a bearing 15 and a rotating shaft 16 . The bearing 15 is arranged between the fixed shaft 14 and the rotating shaft 16 . The fixed shaft 14 is fixedly connected to the fixed base 13 , and the rotating shaft 16 is fixedly connected to the rotating rocker arm bracket 5 .

[0073] There are two bearings 15 , one bearing 15 is located above the fixed shaft 14 , and the other bearing 15 is located below the fixed shaft 14 .

[0074] The servo motor 8 includes a motor shaft 17 and an output gear 18 . The output gear 18 is fixedly disposed at the end of the motor shaft 17 .

[0075] The turning gear 7 and the output gear 18 of the servo motor 8 are both bevel gears. The turning gear 7 and the servo motor 8 are connected through gear meshing. The turning gear 7 is sleeved on the rotating shaft 16.

[0076] Further preferably, the first demagnetization coil module 2 includes a first bracket 25, a first surface magnetic detector 19 for collecting surface magnetic data, a first magnetic field coil 20 for demagnetization, and a first cooling pipe 21 arranged in the first magnetic field coil 20 for dissipating heat of the first magnetic field coil 20. The first magnetic field coil 20 is arranged inside the first bracket 25, the first surface magnetic detector 19 is fixed on the surface of the first bracket 25, and the first surface magnetic detector 19 is electrically connected to the controller 1.

[0077] The second demagnetization coil module 11 includes a second bracket 26, a second surface magnetic detector 22 for collecting surface magnetic data, a second magnetic field coil 23 for demagnetization, and a second cooling pipe 24 arranged in the second magnetic field coil 23 for heat dissipation of the second magnetic field coil 23. The second magnetic field coil 23 is arranged inside the second bracket 26, the second surface magnetic detector 22 is fixed on the surface of the second bracket 26, and the second surface magnetic detector 22 is electrically connected to the controller 1.

[0078] The demagnetization current generator 12 is connected to the first magnetic field coil 20 and the second magnetic field coil 23 respectively. The demagnetization current generator 12 is used to input demagnetization current to the first magnetic field coil 20 and the second magnetic field coil 23 .

[0079] This embodiment is another preferred implementation method. The residual magnetism data collected by the demagnetization coil module during the demagnetization process can be used for subsequent traceability, quality control, and research and analysis, providing strong support for the full life cycle management of the product.

[0080] Example 5

[0081] See also Figures 1-6 A method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine motor comprises the following steps:

[0082] S1. Fix the outer rotor on the fixed base 13, and detect the current magnetic pole position and surface magnetic data by the first surface magnetic detector 19 and the second surface magnetic detector 22 respectively;

[0083] S2. Adjust the vertical and radial positions of the first demagnetization coil module 2 and the second demagnetization coil module 11 according to the magnetic pole positions, so that the first demagnetization coil module 2 and the second demagnetization coil module 11 respectively contact and cover the corresponding magnetic poles;

[0084] S3, the demagnetization current generator 12 applies directional demagnetization current to the first magnetic field coil 20 in the first demagnetization coil module 2 and the second magnetic field coil 23 in the second demagnetization coil module 11 arranged opposite to each other based on the magnetic polarity;

[0085] S4, increasing the demagnetization peak voltage of the demagnetization current generator 12 in stages, and cyclically performing detection, demagnetization, and surface magnetic data comparison until the surface magnetic data does not change, and determining the complete demagnetization voltage;

[0086] S5, demagnetizing the remaining magnetic poles according to the demagnetization angle step according to the complete demagnetization voltage;

[0087] S6. After demagnetization is completed, perform surface magnetic detection on all magnetic poles in the circumferential direction of the rotor, and increase the voltage to compensate for the magnetic poles that have not been demagnetized until all magnetic poles are demagnetized.

[0088] This embodiment is another preferred implementation method. The demagnetization method can more accurately demagnetize each magnetic pole through the steps of automatic positioning, step-by-step demagnetization, and gradual parameter optimization, and supplementary demagnetization is performed on the incompletely demagnetized parts until all magnetic poles are completely demagnetized. This refined demagnetization operation method combined with the optimization and adjustment of demagnetization parameters can ensure the best demagnetization effect and avoid the problems of incomplete demagnetization or excessive demagnetization that may occur in the prior art.

[0089] Example 6

[0090] See also Figures 1-6 A method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine motor comprises the following steps:

[0091] S1. Fix the outer rotor on the fixed base 13, and detect the current magnetic pole position and surface magnetic data by the first surface magnetic detector 19 and the second surface magnetic detector 22 respectively;

[0092] S2. Adjust the vertical and radial positions of the first demagnetization coil module 2 and the second demagnetization coil module 11 according to the magnetic pole positions, so that the first demagnetization coil module 2 and the second demagnetization coil module 11 respectively contact and cover the corresponding magnetic poles;

[0093] S3, the demagnetization current generator 12 applies directional demagnetization current to the first magnetic field coil 20 in the first demagnetization coil module 2 and the second magnetic field coil 23 in the second demagnetization coil module 11 arranged opposite to each other based on the magnetic polarity;

[0094] S4, increasing the demagnetization peak voltage of the demagnetization current generator 12 in stages, and cyclically performing detection, demagnetization, and surface magnetic data comparison until the surface magnetic data does not change, and determining the complete demagnetization voltage;

[0095] S5, demagnetizing the remaining magnetic poles according to the demagnetization angle step according to the complete demagnetization voltage;

[0096] S6. After demagnetization is completed, perform surface magnetic detection on all magnetic poles in the circumferential direction of the rotor, and increase the voltage to compensate for the magnetic poles that have not been demagnetized until all magnetic poles are demagnetized.

[0097] Further preferably, in said S3, the demagnetization current is a unidirectional pulse current.

[0098] In S3, applying a directional demagnetization current means that if the polarity of the magnetic pole corresponding to the first demagnetization coil module 2 is the same as the polarity of the magnetic pole corresponding to the second demagnetization coil module 11, the directions of the demagnetization currents applied are the same; if the polarities are opposite, the directions of the demagnetization currents applied are opposite.

[0099] This embodiment is another preferred implementation method. Compared with the existing technology, the demagnetization method improves the demagnetization quality and consistency, which is of great significance for the subsequent rotor maintenance and recycling.

[0100] Example 7

[0101] See also Figure 1-Figure 7 A method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine motor comprises the following steps:

[0102] S1. Fix the outer rotor on the fixed base 13, and detect the current magnetic pole position and surface magnetic data by the first surface magnetic detector 19 and the second surface magnetic detector 22 respectively;

[0103] S2. Adjust the vertical and radial positions of the first demagnetization coil module 2 and the second demagnetization coil module 11 according to the magnetic pole positions, so that the first demagnetization coil module 2 and the second demagnetization coil module 11 respectively contact and cover the corresponding magnetic poles;

[0104] S3, the demagnetization current generator 12 applies directional demagnetization current to the first magnetic field coil 20 in the first demagnetization coil module 2 and the second magnetic field coil 23 in the second demagnetization coil module 11 arranged opposite to each other based on the magnetic polarity;

[0105] S4, increasing the demagnetization peak voltage of the demagnetization current generator 12 in stages, and cyclically performing detection, demagnetization, and surface magnetic data comparison until the surface magnetic data does not change, and determining the complete demagnetization voltage;

[0106] S5, demagnetizing the remaining magnetic poles according to the demagnetization angle step according to the complete demagnetization voltage;

[0107] S6. After demagnetization is completed, perform surface magnetic detection on all magnetic poles in the circumferential direction of the rotor, and increase the voltage to compensate for the magnetic poles that have not been demagnetized until all magnetic poles are demagnetized.

[0108] In the above-mentioned S3, the demagnetization current is a unidirectional pulse current.

[0109] In S3, applying a directional demagnetization current means that if the polarity of the magnetic pole corresponding to the first demagnetization coil module 2 is the same as the polarity of the magnetic pole corresponding to the second demagnetization coil module 11, the directions of the demagnetization currents applied are the same; if the polarities are opposite, the directions of the demagnetization currents applied are opposite.

[0110] More preferably, the inner axial lengths of the first magnetic field coil 20 and the second magnetic field coil 23 are both 30 mm longer than the axial lengths of the magnetic poles of the rotor.

[0111] The inner circumferential widths of the first magnetic field coil 20 and the second magnetic field coil 23 are both 10 mm greater than the circumferential widths of the magnetic poles of the rotor.

[0112] The outer circumferential widths of the first magnetic field coil 20 and the second magnetic field coil 23 are both 16 mm smaller than the sum of the widths of a single rotor pole and the gaps between adjacent magnetic poles.

[0113] This embodiment is the best implementation method, which achieves full-area magnetic field coverage and eliminates edge magnetic leakage, thereby ensuring the demagnetization effect of the magnetic poles while reducing energy consumption.

[0114] The basic principles of the present invention are as follows:

[0115] First, the rotor to be processed is fixed on the fixed base 13, and the surface magnetic field distribution data and the spatial position information of the magnetic poles on the rotor surface are collected in real time through the surface magnetic detector integrated in the demagnetization coil module, and the multi-dimensional sensing data is synchronously transmitted to the controller 1; then, the vertical slide rail bracket and the hydraulic support column are driven by the controller 1 to dynamically adjust the axial displacement and radial positioning of the demagnetization coil module to achieve precise spatial matching between the magnetic field coil and the target magnetic pole.

[0116] During the demagnetization execution phase, the controller 1 determines the direction of the demagnetization current passed into the magnetic field coil based on the magnetic polarity collected by the surface magnetic detector, and outputs a modulation instruction to the demagnetization current generator 12. The demagnetization current generator 12 applies a pulsed demagnetization current to the symmetrically arranged demagnetization coils to form a reverse demagnetization field.

[0117] The demagnetization effect verification stage adopts a closed-loop feedback mechanism, and the demagnetization area is re-measured in situ through the surface magnetic detector. The diagnostic algorithm built into the controller 1 performs vector comparison analysis on the real-time surface magnetic data and the initial reference value. When the demagnetization efficiency is lower than the preset threshold, the controller 1 adaptively optimizes the parameters, increases the demagnetization voltage peak in a step-by-step manner, and cyclically executes the positioning-demagnetization-detection process until the complete demagnetization voltage is determined when the surface magnetic data does not change.

[0118] After the reference poles are demagnetized, the full circumference of the poles is processed using the calibrated demagnetization parameters, with the circumferential spacing of the poles as the step angle. The servo motor 8 drives the turning gear 7, which drives the rotating rocker bracket 5 on the rotating shaft 16 to rotate, driving the first demagnetization coil module 2 and the second demagnetization coil module 11 arranged opposite each other to rotate. The surface magnetic field of all poles is detected again, and the feedback is collected and sent to the controller 1 to identify the poles that have not been fully demagnetized. The peak demagnetization voltage is increased and demagnetization is performed again until all poles are completely demagnetized.

Claims

1. A permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system, comprising a controller (1), characterized in that: The invention also includes a first demagnetization coil module (2), a first vertical slide rail bracket (3), a first hydraulic support column (4), a rotating rocker arm bracket (5), a rotating shaft system component (6), a turning gear (7), a servo motor (8), a second hydraulic support column (9), a second vertical slide rail bracket (10), a second demagnetization coil module (11), a demagnetization current generator (12) and a fixed base (13), wherein one end of the rotating rocker arm bracket (5) is connected to the first hydraulic support column (4), the other end of the rotating rocker arm bracket (5) is connected to the second hydraulic support column (9), the upper end of the rotating shaft system component (6) is connected to the middle part of the rotating rocker arm bracket (5), the lower end of the rotating shaft system component (6) is fixedly connected to the fixed base (13), and the turning gear (7) is arranged on the rotating shaft system component. (6), the winch gear (7) is connected to the servo motor (8), the first vertical slide rail bracket (3), the first hydraulic support column (4), the second vertical slide rail bracket (10), the second hydraulic support column (9), the demagnetization current generator (12) and the servo motor (8) are respectively electrically connected to the controller (1), the first demagnetization coil module (2) and the second demagnetization coil module (11) are respectively connected to the demagnetization current generator (12), the first demagnetization coil module (2) is slidably connected to the first vertical slide rail bracket (3), the first vertical slide rail bracket (3) is fixedly connected to the first hydraulic support column (4), the second demagnetization coil module (11) is slidably connected to the second vertical slide rail bracket (10), and the second vertical slide rail bracket (10) is fixedly connected to the second hydraulic support column (9).

2. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 1, characterized in that: The first demagnetization coil module (2) performs horizontal reciprocating motion under the action of the first hydraulic support column (4).

3. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 1, characterized in that: The second demagnetization coil module (11) performs horizontal reciprocating motion under the action of the second hydraulic support column (9).

4. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 1, characterized in that: The rotating shaft system assembly (6) comprises a fixed shaft (14), a bearing (15) and a rotating shaft (16), wherein the bearing (15) is arranged between the fixed shaft (14) and the rotating shaft (16), the fixed shaft (14) is fixedly connected to the fixed base (13), and the rotating shaft (16) is fixedly connected to the rotating rocker arm bracket (5).

5. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 4, characterized in that: There are two bearings (15), one bearing (15) is located on the upper part of the fixed shaft (14), and the other bearing (15) is located on the lower part of the fixed shaft (14).

6. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 4, characterized in that: The servo motor (8) comprises a motor shaft (17) and an output gear (18), wherein the output gear (18) is fixedly arranged at the end of the motor shaft (17).

7. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 6, characterized in that: The turning gear (7) and the output gear (18) of the servo motor (8) are both bevel gears. The turning gear (7) and the servo motor (8) are connected through gear meshing. The turning gear (7) is sleeved on the rotating shaft (16).

8. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 1, characterized in that: The first demagnetization coil module (2) includes a first bracket (25), a first surface magnetic detector (19) for collecting surface magnetic data, a first magnetic field coil (20) for demagnetization, and a first cooling pipe (21) arranged in the first magnetic field coil (20) for dissipating heat from the first magnetic field coil (20), the first magnetic field coil (20) being arranged inside the first bracket (25), the first surface magnetic detector (19) being fixed on the surface of the first bracket (25), and the first surface magnetic detector (19) being electrically connected to the controller (1).

9. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 8, characterized in that: The second demagnetization coil module (11) includes a second bracket (26), a second surface magnetic detector (22) for collecting surface magnetic data, a second magnetic field coil (23) for demagnetization, and a second cooling pipe (24) arranged in the second magnetic field coil (23) for dissipating heat from the second magnetic field coil (23). The second magnetic field coil (23) is arranged in the second bracket (26), the second surface magnetic detector (22) is fixed on the surface of the second bracket (26), and the second surface magnetic detector (22) is electrically connected to the controller (1).

10. The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 9, characterized in that: The demagnetization current generator (12) is connected to the first magnetic field coil (20) and the second magnetic field coil (23), respectively, and the demagnetization current generator (12) is used to input demagnetization current to the first magnetic field coil (20) and the second magnetic field coil (23).

11. A method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine, characterized in that: The permanent magnet direct drive wind turbine outer rotor magnetic steel demagnetization system according to claim 10 comprises the following steps: S1, fixing the outer rotor on the fixed base (13), and detecting the current magnetic pole position and surface magnetic data by using the first surface magnetic detector (19) and the second surface magnetic detector (22); S2, adjusting the vertical position and the horizontal position of the first demagnetization coil module (2) and the second demagnetization coil module (11) respectively according to the magnetic pole position, so that the first demagnetization coil module (2) and the second demagnetization coil module (11) respectively contact and cover the corresponding magnetic pole; S3, the demagnetization current generator (12) applies a directional demagnetization current to the first magnetic field coil (20) in the first demagnetization coil module (2) and the second magnetic field coil (23) in the second demagnetization coil module (11) respectively, which are arranged opposite to each other, based on the magnetic polarity; S4, increasing the demagnetization peak voltage of the demagnetization current generator (12) in stages, and cyclically executing detection, demagnetization and surface magnetic data comparison until the complete demagnetization voltage is determined when the surface magnetic data does not change; S5, demagnetizing the remaining magnetic poles according to the demagnetization angle step according to the complete demagnetization voltage; S6. After demagnetization is completed, perform surface magnetic detection on all magnetic poles in the circumferential direction of the rotor, and increase the voltage to compensate for the magnetic poles that have not been demagnetized until all magnetic poles are demagnetized.

12. A method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine according to claim 11, characterized in that: In the above-mentioned S3, the demagnetization current is a unidirectional pulse current.

13. The method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine according to claim 11, characterized in that: In the above S3, applying a directional demagnetization current means that if the polarity of the magnetic pole corresponding to the first demagnetization coil module (2) is the same as the polarity of the magnetic pole corresponding to the second demagnetization coil module (11), the direction of the demagnetization current is the same; if the polarity is opposite, the direction of the demagnetization current is opposite.

14. The method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine according to claim 11, characterized in that: The inner axial lengths of the first magnetic field coil (20) and the second magnetic field coil (23) are both 0-50 mm longer than the axial lengths of the magnetic poles of the rotor.

15. The method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine according to claim 11, characterized in that: The inner circumferential widths of the first magnetic field coil (20) and the second magnetic field coil (23) are both 0-10 mm greater than the circumferential width of the magnetic poles of the rotor.

16. The method for demagnetizing the outer rotor magnetic steel of a permanent magnet direct-drive wind turbine according to claim 11, characterized in that: The outer circumferential widths of the first magnetic field coil (20) and the second magnetic field coil (23) are both at least 10 mm smaller than the sum of the widths of a single magnetic pole of the rotor and the gaps between adjacent magnetic poles.

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