Permanent magnet direct drive wind turbine, system and its stator

Abstract

The present invention provides a permanent magnet direct drive wind power generator, a system and a stator thereof, wherein the stator includes a stator bracket, a stator core arranged on the outer peripheral wall of the stator bracket, and a paddle side tooth pressure plate, and the paddle side tooth pressure plate is arranged on On the paddle side axial end face of the stator core, at least one first air hole is opened on the outer peripheral wall of the stator bracket, and at least one second air hole is opened on the paddle side tooth pressure plate, and the stator also includes There is at least one airflow channel communicating with the first air hole and the second air hole, and the airflow channel passes through the inside of the stator core. The embodiment of the present invention uses the "micro-positive pressure" technology inside the stator and rotor of the high-altitude wind power generator, so that the motor can self-adaptively dry itself, and prevent the external bad airflow from entering the motor, prolonging the service life of the permanent magnet poles and preventing The "insulation level reduction" of the internal components of the motor is reduced, the risk of the motor being eroded by harsh airflow is reduced, and the insulation reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power, and in particular relates to a permanent magnet direct drive wind power generator, a system and a stator thereof. Background technique [0002] In the prior art, the open type permanent magnet direct drive external rotor wind turbine relies on natural air cooling, and the open structure is conducive to natural ventilation and heat exchange, which helps to use permanent magnet materials for the magnetic poles to prevent the magnetic degradation after the temperature rise exceeds the standard, but the generator is usually exposed. Under extremely harsh environmental conditions (exposed to wind, frost, rain, snow, sand, salt spray, etc.). [0003] 1. Sources and hazards of moisture inside the motor in a humid environment [0004] (1) Source of moisture [0005] In a humid environment, rain and snow are more likely to enter the motor than in a normal environment. In summary, the main sources of ...

AI Technical Summary

Problems solved by technology

[0006] The wind turbine outside the nacelle running outdoors is directly soaked by rain and snow melt, and a small amount of water enters the motor from the annular gap through the rotation of the motor; when the generator stops working in wet weather, moisture enters the generator Condensation occurs inside; generators that have been shut down for a long time are prone to moisture condensation due to moisture ingress; wind turbines working in harsh environments may also suffer from accidents such as rain, snow, and water immersion (drain holes are clogged), causing moisture to enter; generator production During the process, the moisture remaining in the insulation capillary is caused by not pre-baking according to the process requirements or not drying thoroughly after dipping, etc.

[0007] (2) The reason why the generator insulation is easy to be damp

[0012] (3) Hazards caused by moisture inside the generator

They can cause deterioration of insulation performance, lead to deterioration of electrical and mechanical properties of motor insulation, reduction of residual withstand voltage level and life, and eventually lead to insulation damage

[0034] (2) All of the above are operations of ground generator sets, and the operation at an altitude of 60-100 meters, including the realization of various functions, especially the maintenance of the engine room, is usually beyond the reach of manpower and material resources, and even becomes impossible

Some good methods used on the ground are inconvenient or even difficult to apply to wind turbines operating in the "sky"

[0035] (3) Relying on the above-mentioned hot air drying method alone is only a surface drying technology, which cannot solve the drying demand after the laminated layers inside the stator core are damp.

[0036] (4) The use of an open structure cannot resist the hazards of rain or snow intruding into the generator in windy and windy weather or in windy and snowy weather. The "reduced insulation level" pays for the cooling of the generator

[0037] (5) After shutdown, the humid air in the generator cavity and air gap condenses and infiltrates into the motor, which will cause the motor stator and the surface coating of the permanent magnet poles to be damp, which will affect their service life

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