Slip Ring Fan Insulating Segment Cooling
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Solution Overview
Problem
Slip ring units in electrical machines, particularly in wind turbines, face increased heat loads due to compact designs, leading to potential damage from high temperatures, as existing cooling methods are inefficient and costly, limiting power capacity and service life.
Innovation Solution
Incorporating insulating segments with shaped sections forming a fanwheel to distribute cooling air flows through boreholes in the slip ring unit, enhancing cooling efficiency and reducing temperatures without enlarging the slip ring surface, thus enabling higher power densities and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the slip ring unit is made compact to increase power density, then the power capacity increases, but the temperature of slip ring components increases sharply leading to potential damage
Solution Approach 1:
The insulating segment is merged with cooling fan functionality by shaping it with shaped sections that form fan blades. This combines the insulating function with the cooling function into a single component, allowing compact design while effectively reducing temperatures of slip ring components through the fan-generated airflow.
2Temperature
If conventional cooling methods are used, then cooling is provided, but the design becomes costly and complex
Solution Approach 1:
The cooling fan is merged with the insulating segment, eliminating the need for separate cooling components. This reduces device complexity and cost while maintaining effective cooling, as the insulating segment itself generates cooling airflow through its shaped fan sections.
Solution Approach 2:
The insulating segment serves dual purposes: electrical insulation and active cooling. By shaping the insulating segment with fan blades, it generates cooling airflow automatically during rotation, providing self-service cooling without requiring additional powered cooling systems.
3Temperature
If the slip ring surface is enlarged to reduce heat load, then cooling improves, but the size and cost increase
Solution Approach 1:
Instead of enlarging the slip ring surface, the invention uses pneumatic cooling by shaping the insulating segment to generate airflow. The shaped sections form fan blades that create cooling air flow, actively removing heat without increasing the physical surface area of the slip ring components.
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 reduces temperatures across the electrical machine, allowing for smaller, higher-power slip ring units with increased load-bearing capacity and service life, while being cost-effective and compatible with existing systems for retrofitting.
Implementation Method 1
the insulating segment having the shaped sections forms a fan, which is provided to distribute a cooling air flow to the parts of the electrical machine to be cooled
Data Source
AI summary
A slip ring unit for an electrical machine is provided for accommodating a carbon brush system. The slip ring unit includes at least one insulating segment having shaped sections for cooling parts of the electrical machine. The insulating segment having the shaped sections is shaped from the insulating segment as a fanwheel, wherein the insulating segment having the shaped sections forms a fan to distribute a cooling air flow to the parts of the electrical machine to be cooled. The slip ring unit has boreholes on the sides of supports of the slip rings for passage of cooling air.