Semi-direct drive megawatt-level permanent-magnet windmill generator

Abstract

The invention discloses a semi-direct drive megawatt-level permanent-magnet windmill generator which relates to the technical field of windmill generators. The semi-direct drive megawatt-level permanent-magnet windmill generator comprises a permanent magnet fixing structure, a cooling ventilation structured bearing insulating structure and a stator core compaction structure, wherein the permanent magnet fixing structure comprises a magnetic steel fixed mount and a stainless steel bolt, and the magnetic steel fixed mount is used for installing the permanent magnet; the bottom of the magnetic steel fixed mount is closely laminated with the permanent magnet; joint lugs on both ends of the bottom of the magnetic steel fixed mount are provided with through holes which are matched with the stainless steel bolt; and the magnetic steel fixed mount is connected with a rotor cylinder through the stainless steel bolt. In the invention, the defect of unfirm fixation of the prior high-power surface type permanent-magnet rotor permanent magnet on the rotor is overcome, thereby ensuring the reliability and efficiency of the generator, and the defects in the prior ventilation structure is also overcome, thereby increasing the length of the wind path, enhancing the heat elimination efficiency and further effectively lowering the operation temperature rise of the motor.

Description

[0001] technical field [0002] The invention relates to the technical field of wind power generators, in particular to a semi-direct drive megawatt permanent magnet wind power generator. Background technique [0003] A permanent magnet wind turbine usually includes components such as a generator stator, a rotor, and an outlet box. In addition, permanent magnet fixing parts, magnetic steel assembly tools, cooling ventilation parts, insulating bearings, and stator core compression structures are also required. The existing permanent magnet generator has the following disadvantages: [0004] 1. For the fixing structure of the surface magnet of the permanent magnet wind power generator, a new type of surface permanent magnet fixing method has appeared in the prior art, such as the Chinese patent with the publication number CN2840480 and the publication date being November 22, 2006 The literature discloses a surface-type permanent magnet fixing method. The technical soluti...

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Problems solved by technology

However, for permanent magnet synchronous wind turbines with relatively small shaft diameters, the above-mentioned ventilation structure obviously cannot effectively dissipate heat, and cannot effectively ensure that the temperature rise of the motor meets the requirements

[0006] 3. For the bearing insulation structure, the existing technology often uses insulating materials to isolate the connection between the bearing and the end cover. For example, the Chinese patent with the publication number CN101728894A and the publication date of June 9, 2010 discloses an insulating end cover. The insulating cover structure is provided with radial and axial insulating sleeves on the outer ring of the bearing. The insulating sleeve of this insulating structure has a simple structure, is easy to manufacture, and can better protect the bearing and the motor, but the insulating sleeve axial There are shoulders, so the requirements for processing and process installation are higher

The above methods can effectively fix and compress the stator core, but due to the existence of welds, it is difficult to adjust the tightness of the iron core after the iron core is pressed. circuit, increasing the core loss

In addition, although the tightening screw can be used to adjust the tightness of the iron core, because the screw thread bears the compression tension of the entire iron core, it may cause the screw to fail to shear.

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