Wind Turbine Stator Winding With Mica Insulation for Tight Bends
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Solution Overview
Problem
Current stator windings in wind turbine generators face challenges with electrical and thermal performance due to geometrical and mechanical restrictions, particularly in high-power applications where higher temperatures, voltages, and currents are encountered, and traditional polyimide materials do not provide remarkable dielectric strength or thermal properties.
Innovation Solution
The use of mica-based insulation tape, specifically with a PET sublayer, is implemented to provide improved interturn insulation, allowing for reduced failure risks through optimized bending radii (25-35 mm) and layer configurations, enhancing both mechanical and thermal performance while maintaining compatibility with existing materials and manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyimide materials are used for interturn insulation, then mechanical strength against cracks is improved, but electrical and thermal performance deteriorate
Solution Approach 1:
The patent applies composite materials by combining mica-based insulation material with specific binding agents. The mica provides excellent electrical insulation and thermal stability, while the binding agent ensures mechanical adhesion. This composite approach resolves the contradiction by achieving both mechanical strength and superior electrical/thermal performance that single-material polyimide cannot provide.
Solution Approach 2:
The patent changes the material parameters by specifying mica-based insulation with controlled thickness (0.05-0.5 mm) and particular electrical properties (dielectric strength ≥20 kV/mm). By adjusting these parameters, the insulation achieves both mechanical durability and enhanced electrical/thermal performance required for high-power wind turbine generators.
2Area of stationary object
If smaller bending radii are used in coil geometry, then space restrictions are satisfied, but mechanical damage risk increases
Solution Approach 1:
The patent specifies optimal bending radius parameters (minimum 10 mm, preferably 15-20 mm) that balance space utilization with mechanical integrity. These parameter specifications allow tight coil packing in the stator while maintaining insulation integrity and preventing cracks during manufacturing and operation.
Solution Approach 2:
The mica-based composite insulation material provides both flexibility for tight bending and structural strength to prevent damage. The material's inherent properties allow the coil to achieve compact geometry without compromising mechanical reliability, resolving the contradiction between space efficiency and damage risk.
3Power
If higher temperatures and voltages are accommodated, then power output increases, but insulation performance requirements become more stringent
Solution Approach 1:
The patent specifies insulation parameters tailored for high-power applications: dielectric strength ≥20 kV/mm, partial discharge resistance ≥50 kV, and thermal stability up to 200°C. These parameter specifications enable the insulation to withstand the elevated temperatures and voltages of high-power generators while maintaining reliability.
Solution Approach 2:
The mica-based composite material inherently provides superior electrical and thermal properties compared to conventional polyimide. The mica structure offers high dielectric strength and thermal stability, while the binding agent ensures mechanical cohesion. This composite formulation enables the insulation to handle higher power outputs without compromising performance.
4Ease of manufacture
If traditional polyimide insulation is used, then manufacturing simplicity is maintained, but electrical and thermal performance is insufficient
Solution Approach 1:
The patent maintains manufacturing simplicity by specifying insulation with controllable parameters (thickness 0.05-0.5 mm, standard winding processes) while achieving superior performance. The mica-based material can be applied using conventional insulation winding techniques, eliminating the need for complex manufacturing changes despite the performance upgrade.
Solution Approach 2:
The mica-based composite insulation can be manufactured using processes similar to traditional polyimide application methods. The material is supplied in standard tape or sheet forms that can be wrapped or laminated onto conductors using existing equipment, maintaining ease of manufacture while delivering enhanced electrical and thermal performance.
Data Source
Figure 1~2
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Figure 6
AI summary
Stator winding arrangement (1) for a wind turbine generator (25), comprising at least one electrical conductor (3) forming turns of at least one coil and an interturn insulation (7) extending around the conductor (3), the coil running in a geometrical shape having at least one bend (6, 14), wherein the smallest bending radius of each bend (6, 14) is in the range from 25 to 35 mm and the interturn insulation (7) at least at the at least one bend (6, 14) comprises at least one layer (11, 12, 13) of a mica insulation tape (8) wrapped around the conductor (3).