Stator Iron Core Air Flow Passages for Wind Generator Cooling
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Solution Overview
Problem
Permanent magnet direct-drive wind power generators face insulation degradation and moisture-related issues due to exposure to harsh environmental conditions, leading to reduced insulation levels and increased maintenance challenges, especially in high-altitude and offshore locations.
Innovation Solution
The implementation of air flow passages within the stator iron core to create a micro-positive pressure environment, using convergent nozzles to resist external severe air flows and facilitate drying and cooling, thereby preventing moisture intrusion and extending the service life of the generator's insulation and magnetic poles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If natural air cooling is employed for the generator, then heat dissipation is improved, but insulation moisture absorption worsens due to air humidity intrusion
Solution Approach 1:
The generator structure is segmented into separate cooling channels and insulation protection zones. Air flow passages are specifically routed through the stator iron core to create dedicated cooling paths that do not directly expose insulation to humid air, separating the cooling function from the insulation exposure risk
Solution Approach 2:
Dry air acts as an intermediary substance between the external humid environment and the internal insulation. The system introduces dry air into the generator interior to displace humid air, creating a protective atmosphere that prevents moisture absorption while maintaining effective heat dissipation
2Productivity
If the generator operates in harsh environmental conditions, then power generation capability is maintained, but insulation degradation accelerates due to moisture intrusion
Solution Approach 1:
The system performs preliminary drying of air before it enters the generator interior. By introducing dry air into the generator before operation or during idle periods, the insulation is pre-protected from moisture intrusion that would occur during harsh environmental operation, preventing degradation before it starts
Solution Approach 2:
Dry air creates an inert atmospheric environment inside the generator that is resistant to moisture absorption. This controlled atmosphere protects the insulation from the harmful effects of external harsh conditions including rain, snow, and high humidity, allowing the generator to maintain power generation capability without insulation degradation
3Reliability
If air flow passages are introduced in the stator iron core, then moisture resistance is improved, but device complexity increases
Solution Approach 1:
The air flow passages in the stator iron core serve multiple functions simultaneously: they provide cooling by facilitating heat dissipation, they prevent moisture intrusion by creating positive pressure, and they enable drying of the insulation. This multi-functionality reduces the need for separate dedicated systems for each function, offsetting the complexity increase with operational efficiency gains
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents insulation degradation and moisture damage, ensuring reliable operation and extended service life by maintaining a dry environment within the generator, even in harsh weather conditions, and reducing maintenance complexities.
Implementation Method 1
The air flow passages (9) within the stator iron core (8) are configured to introduce the air flow from inside the stator to an axial end face of the stator iron core (8)... create a micro-positive pressure environment
Implementation Method 2
using convergent nozzles to resist external severe air flows... An annular convergent nozzle (4) may be provided on the axial end face of the stator iron core (8)
Implementation Method 3
The air flow passages (9) within the stator iron core (8) are configured to introduce the air flow from inside the stator to an axial end face of the stator iron core (8)... facilitate drying and cooling
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed are a permanent-magnet direct-drive wind power generator, a system and a stator thereof, wherein the stator comprises a stator bracket (1), a stator iron core (8) arranged on the peripheral wall of the stator bracket and a paddle side tooth pressing plate (6). The paddle side tooth pressing plate is arranged on a paddle side axial end face of the stator iron core. At least one first air hole (2) is formed in the peripheral wall of the stator bracket. At least one second air hole (5) is formed in the paddle side tooth pressing plate. The stator further comprises at least one air flow passage (9) used for linking the first air holes with the second air holes. The air flow passage penetrates through the interior of the stator iron core. The electric motor can self-adaptively dry itself, the service life of permanent magnet poles is prolonged, an "insulation level reduction" of components inside the electric motor is prevented, the risk that the electric motor is corroded by severe air flow is lowered, and insulation reliability is improved.