High-speed permanent magnet synchronous wind generator rotor magnetic pole box

Abstract

The utility model discloses a high -speed permanent magnet synchronous wind driven generator rotor magnetic pole box, including locating plate, magnetic steel and insulating block, the locating plate has two, presents upside -down symmetry and sets up, the magnetic steel has a plurality of, along the length direction of locating plate equal interval arrangement between two locating plates, insulates through the insulating block between every two adjacent magnetic steel, and the locating plate is located between every two adjacent magnetic steel and is provided with the ventilation groove of being convenient for magnetic steel ventilation heat dissipation. The utility model can effectively solve traditional rotor magnetic pole box heat dissipation poor, magnetic pole positioning is not stable, eddy current loss is big, assembly complex etc.

Description

Technical Field

[0001] This utility model relates to the technical field of permanent magnet synchronous wind turbine generators, and in particular to a rotor pole box for a high-speed permanent magnet synchronous wind turbine generator. Background Technology

[0002] Currently, most high-speed permanent magnet synchronous generators employ a segmented pole box structure. This involves embedding magnets into pole boxes, connecting several pole boxes in series to form a single pole, and then fixing this pole to the rotor yoke to create a salient pole. In this structure, because the pole boxes are made of magnetically conductive material, significant magnetic leakage occurs inside. To overcome this leakage and maintain a strong magnetic field, current technology aims to minimize the thickness of the magnetic isolation bridge within the pole box. However, reducing the bridge thickness leads to a decrease in the overall strength of the pole box. Furthermore, because the rotor support of a high-speed permanent magnet synchronous motor is relatively long and has a smaller radius than that of a semi-direct drive motor, the traditional structure of connecting and fixing the pole boxes in series has low strength, making it prone to cracking when the motor rotates at high speed. In addition, this structure relies solely on inter-pole gaps for ventilation and heat dissipation, resulting in a small effective heat dissipation area. This can easily lead to severe rotor overheating and irreversible demagnetization of the permanent magnets, particularly noticeable in high-power permanent magnet wind turbines. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-speed permanent magnet synchronous wind turbine rotor pole box that can effectively solve the problems of poor heat dissipation performance, unstable pole positioning, large eddy current loss, and complex assembly of traditional rotor pole boxes.

[0004] The objective of this utility model can be achieved by adopting the following technical solutions:

[0005] A high-speed permanent magnet synchronous wind turbine rotor pole box includes a positioning plate, magnets, and an insulating block. There are two positioning plates arranged symmetrically at the top and bottom. There are multiple magnets arranged at equal intervals between the two positioning plates along the length of the positioning plate. The magnets are insulated from each other by the insulating block. Ventilation slots are provided on the positioning plates between the magnets to facilitate ventilation and heat dissipation.

[0006] Furthermore, the positioning plate has multiple mounting slots for installing magnets arranged along its length. The number of mounting slots corresponds to the number of magnets and they are one-to-one. The upper or lower part of the magnet is inserted into the mounting slot.

[0007] Furthermore, the magnetic pole box is installed inside the magnetic pole lamination of the rotor, and the two positioning plates of the magnetic pole box are respectively set to correspond to the top plate and bottom plate of the magnetic pole lamination. The top plate and bottom plate of the magnetic pole lamination are respectively provided with ventilation structures at the positions corresponding to the ventilation slots of the corresponding positioning plates to facilitate ventilation and heat dissipation of the magnets.

[0008] Furthermore, the inner surfaces of the two positioning plates are respectively provided with epoxy adhesive layers for fixing the magnets and the insulating blocks.

[0009] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0010] The magnetic pole box of this utility model enables quick assembly and disassembly of the magnets and insulating blocks through a positioning plate, reducing the complexity of on-site assembly; it innovatively integrates the ventilation slot into the body of the magnetic pole box, and with the centrifugal air duct design of the ventilation structure of the magnetic pole lamination, the temperature rise is greatly reduced compared with the traditional structure; the use of insulating blocks to separate adjacent magnetic poles blocks the eddy current path, prevents magnetic short circuits and improves mechanical stability and reliability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the magnetic pole box of this utility model.

[0012] Figure 2 This is a schematic diagram of the internal structure of the magnetic pole box of this utility model.

[0013] Figure 3 This is a schematic diagram of the positioning plate of this utility model.

[0014] Figure 4 This is a schematic diagram of the structure of the magnetic pole laminations of the rotor of this utility model.

[0015] Figure 5 This is a top view of the magnetic pole laminations of the rotor of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0017] like Figures 1 to 2 As shown, this embodiment provides a high-speed permanent magnet synchronous wind turbine rotor pole box, including a positioning plate 1, magnets 2, and an insulating block 3. There are two positioning plates 1, which are arranged symmetrically in the upper and lower positions. There are multiple magnets 2, which are arranged at equal intervals between the two positioning plates 1 along the length direction of the positioning plates 1. The magnets 2 are insulated from each other by the insulating block 3. The insulating block 3 blocks the eddy current path, prevents magnetic short circuit, and avoids magnetic pole misalignment during operation. In addition, ventilation slots 102 are provided on the positioning plate 1 between each pair of adjacent magnets 2 to facilitate ventilation and heat dissipation of the magnets 2, thereby improving the heat dissipation of the magnets 2.

[0018] like Figure 3 As shown, the positioning plate 1 has multiple mounting slots 101 arranged along its length for quick installation of magnets 2. The number of mounting slots 101 is consistent with the number of magnets 2 and corresponds one-to-one. The ventilation slot 102 is located between two adjacent mounting slots 101. The upper or lower part of the magnet 2 is inserted into the mounting slot. The mounting slot and the magnet are precisely matched (tolerance ±0.05mm) to ensure consistent magnet spacing, improve assembly efficiency and reduce the difficulty of manual adjustment.

[0019] like Figures 4 to 5 As shown, the magnetic pole box is installed inside the magnetic pole lamination 4 of the rotor, and the two positioning plates 1 of the magnetic pole box are respectively set with the top plate and bottom plate of the magnetic pole lamination 4. The top plate and bottom plate of the magnetic pole lamination 4 are respectively provided with ventilation structures 401 at the positions corresponding to the ventilation slots 102 of the corresponding positioning plates to facilitate ventilation and heat dissipation of the magnets, which further effectively avoids demagnetization of the magnets due to excessive temperature rise and improves long-term reliability. At the same time, the alignment of the ventilation slots 102 and the ventilation structures 401 realizes the assembly positioning of the magnetic pole box and the magnetic pole lamination 4, avoiding misalignment of the magnetic pole box.

[0020] The inner sides of the two positioning plates 1 are respectively provided with high-temperature resistant epoxy adhesive layers for fixing the magnet 2 and the insulating block 3 and achieving sealing. They are cured under pressure to form an integral structure, which can effectively avoid the problem of the magnet 2 being easily misaligned or falling off under high-speed rotation, and reduce maintenance costs.

[0021] The installation method of the magnetic pole box in this embodiment is as follows:

[0022] Apply high-temperature resistant epoxy adhesive to the inner side of the positioning plate at the bottom, fit its mounting slot with the lower perimeter of the magnet, insert insulating blocks between pairs of adjacent magnets, apply high-temperature resistant epoxy adhesive to the inner side of the positioning plate at the top, fit its mounting slot with the upper perimeter of the magnet to complete the installation, and finally apply pressure to cure and form the overall structure.

[0023] The magnetic pole box structure of this invention significantly reduces eddy current losses and avoids energy waste and efficiency degradation by cutting off the conductive circuit between magnets through insulating blocks. The insulating blocks also reduce heat generation, maintaining the magnets' operating temperature within a safe range and ensuring long-term stability. The magnetic reluctance characteristics of the insulating blocks isolate the magnetic circuit, ensuring efficient transmission of the magnetic field to the stator. Furthermore, the insulating blocks absorb vibration energy, buffering mechanical stress impacts between magnets to prevent breakage or detachment, thus improving mechanical stability and reliability. Simultaneously, the elasticity of the insulating material (such as epoxy resin or polyimide) allows it to adapt to dimensional differences caused by temperature changes, preventing structural damage caused by thermal stress concentration.

[0024] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A rotor pole box for a high-speed permanent magnet synchronous wind turbine generator, characterized in that: It includes positioning plates, magnets, and insulating blocks. There are two positioning plates, which are arranged symmetrically at the top and bottom. There are multiple magnets, which are arranged at equal intervals between the two positioning plates along the length of the positioning plates. The magnets are insulated from each other by the insulating blocks. Ventilation slots are provided on the positioning plates between each pair of adjacent magnets to facilitate ventilation and heat dissipation of the magnets.

2. The high-speed permanent magnet synchronous wind turbine rotor pole box according to claim 1, characterized in that: The positioning plate has multiple mounting slots for installing magnets along its length. The number of mounting slots corresponds to the number of magnets and the upper or lower part of the magnet is inserted into the mounting slot.

3. The high-speed permanent magnet synchronous wind turbine rotor pole box according to claim 1, characterized in that: The magnetic pole box is installed inside the magnetic pole lamination of the rotor, and the two positioning plates of the magnetic pole box are respectively set to correspond to the top plate and bottom plate of the magnetic pole lamination. The top plate and bottom plate of the magnetic pole lamination are respectively provided with ventilation structures at the positions corresponding to the ventilation slots of the corresponding positioning plates to facilitate ventilation and heat dissipation of the magnets.

4. The rotor pole box of the high-speed permanent magnet synchronous wind turbine generator according to claim 1, characterized in that: The inner surfaces of the two positioning plates are respectively provided with epoxy adhesive layers for fixing the magnets and the insulating blocks.

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