Wind Generator Stator Spiral Comb Tooth Airflow Sealing
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Solution Overview
Problem
Permanent magnet direct-drive wind power generators face challenges with insulation degradation due to exposure to harsh environmental conditions, such as rain, snow, and humidity, leading to reduced insulation levels and increased maintenance difficulties, especially in high-altitude operations where conventional drying methods are ineffective.
Innovation Solution
A stator design with a spiral comb tooth mechanism and air flow passages creates a micro-positive pressure environment within the annular gap between the blade side surrounding plate and the rotor sealing ring, using internal air to resist external severe airflow and maintain insulation integrity by generating a spiral airflow that prevents moisture intrusion and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If natural air cooling is used for the generator, then heat dissipation is improved, but insulation moisture absorption increases due to air humidity intrusion
Solution Approach 1:
The generator structure is divided into separate sealed and unsealed regions. The stator core and windings are enclosed in a sealed cavity isolated from direct exposure to humid air, while the outer surface remains open for natural convection cooling. This segmentation allows different parts of the system to fulfill different functions without compromising either cooling efficiency or insulation protection.
Solution Approach 2:
A sealed cavity acts as an intermediary barrier between the humid external environment and the internal insulation components. This intermediate structure allows heat to be dissipated through the outer surface while preventing direct contact between humid air and the insulation, thus resolving the contradiction between cooling needs and moisture protection.
2Reliability
If the generator is sealed to prevent moisture intrusion, then insulation protection is improved, but natural cooling efficiency deteriorates
Solution Approach 1:
The generator is segmented into a sealed internal cavity for insulation protection and an unsealed external surface for heat dissipation. This allows the system to simultaneously achieve both insulation protection and efficient natural cooling without compromising either function.
Solution Approach 2:
Different regions of the generator have different sealing characteristics. The internal cavity where insulation components are located has high sealing quality to prevent moisture intrusion, while the external surface has low sealing quality to allow free air flow and efficient heat dissipation. This local differentiation resolves the contradiction between protection and cooling.
3Reliability
If contact seal is used to close the generator, then moisture protection is improved, but long-term cooling capability deteriorates due to inability to sustain air flow
Solution Approach 1:
The generator structure separates the sealed cavity (for moisture protection) from the unsealed external surface (for cooling). This segmentation enables the system to maintain moisture protection through selective sealing while preserving natural convection cooling through the unsealed outer region, avoiding the cooling deterioration that would result from complete sealing.
Solution Approach 2:
The sealing is applied locally only where needed for moisture protection (internal cavity), while other regions (external surface) remain unsealed to maintain air flow and cooling capability. This localized sealing approach resolves the contradiction between moisture protection and cooling sustainability.
4Productivity
If the generator operates in harsh environmental conditions, then power generation capability is maintained, but insulation degradation accelerates due to exposure to rain, snow, and humidity
Solution Approach 1:
The generator is divided into a sealed internal cavity protecting insulation components and an unsealed external structure exposed to environmental conditions. This segmentation allows the generator to maintain power generation capability through exposure while protecting insulation from degradation by isolating it in the sealed cavity.
Solution Approach 2:
The sealed cavity serves as an intermediary protective barrier between the harsh external environment and the insulation components. This intermediate structure enables the generator to operate in harsh conditions while preventing direct contact between environmental factors and insulation, thus maintaining both productivity and reliability.
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
The solution effectively extends the service life of the generator's magnetic poles, maintains insulation levels, and reduces the risk of corrosion, ensuring reliable operation in harsh weather conditions by creating a sealed environment that prevents external airflows from entering the generator.
Implementation Method 1
the first spiral comb tooth mechanism has first spiral comb teeth, which protrude into an annular gap formed by the blade side surrounding plate and the rotor sealing ring, for generating an airflow with spiral motion in the annular gap
Implementation Method 2
at least one air flow passage via which the first air hole and the second air hole are in communication with each other, and the at least one air flow passage extends through the interior of the stator iron core
Implementation Method 3
creates a micro-positive pressure environment within the annular gap between the blade side surrounding plate and the rotor sealing ring, using internal air to resist external severe airflow
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Disclosed are a permanent-magnetic direct-drive wind generator, a system and a stator thereof. The stator comprises a stator bracket (1), a stator iron core (8), a paddle side tooth pressing plate (6) and a paddle side surrounding plate (3). The paddle side tooth pressing plate (6) is arranged at the axial end face of the paddle side of the stator iron core (8). The peripheral wall of the stator bracket (1) is provided with a first air hole (2). The paddle side tooth pressing plate (6) is provided with a second air hole (5). The stator also comprises an air flow channel (9) linking the first air hole (2) with the second air hole (5). The air flow channel (9) penetrates through the interior of the stator iron core (8). Comb tooth air inlet holes (21) are arranged on the paddle side surrounding plate (3). The comb tooth air inlet holes (21) and the second air hole (5) are connected via an air guide pipe (22). The paddle side surrounding plate (3) is provided with a first spiral comb tooth mechanism (4) which is annular overall and linked to the comb tooth air inlet holes (21). First spiral comb teeth are located in an annular gap formed by the paddle side surrounding plate (4) and a rotor sealing ring (16). By using this structure, "multiphase" air flow sealing can be performed on the annular gap formed by the paddle side surrounding plate (3) and the rotor sealing ring (16).