Slip Ring Brush Holder Ventilation for Compact High-Power Rotors
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Solution Overview
Problem
The increasing power requirements in dynamoelectric machines lead to excessive heating in slip ring systems, causing damage due to high temperatures, which is exacerbated by compact designs and higher current loads, resulting in increased material costs and larger dimensions.
Innovation Solution
A brush holder with enhanced cooling capabilities, utilizing surface-enlarging structures like ribs and needles on brush pockets, combined with radial and axial fans for forced-air ventilation, to efficiently dissipate heat and maintain optimal temperatures within a compact slip ring system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the slip ring system is designed more compactly to reduce size and cost, then the outer dimensions and material costs decrease, but the heat dissipation becomes more difficult and temperatures increase
Solution Approach 1:
The patent introduces a third dimension for heat dissipation by directing cooling air axially through the brush holders from the end face side, in addition to radial cooling. This axial cooling path through cooling channels and cooling holes provides an additional dimension for heat removal, enabling effective temperature control in compact designs where radial cooling alone would be insufficient.
Solution Approach 2:
The patent uses cooling air as an intermediary medium to transfer heat from the brushes and brush holders to the environment. The cooling air flows through designated channels and holes, absorbing heat from the high-temperature components and carrying it away, thus mediating the heat transfer process and enabling effective thermal management in compact configurations.
2Power
If larger brush holders are used to handle higher power loads, then the power transmittable into the rotor increases, but the working area and outer dimensions increase considerably
Solution Approach 1:
The patent employs pneumatic cooling by forcing cooling air through the brush holders via fans or blowers. This pneumatic system delivers high-velocity cooling air through axial and radial cooling channels, efficiently removing heat from the brush holders and enabling them to handle higher power loads without requiring increased size. The pneumatic cooling system provides intensive heat removal that allows compact high-power design.
3Power
If higher current loads are imposed on the slip ring system to increase power transmission, then the power capacity increases, but the temperatures increase considerably causing damage
Solution Approach 1:
The patent implements preliminary cooling action by pre-cooling the air before it reaches the brushes and brush holders, and by providing continuous cooling channels that are always active during operation. The axial cooling channels and cooling holes are designed to receive cooling air in advance, ensuring that heat is removed proactively before critical temperatures are reached, thereby maintaining reliability under high current loads.
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 allows for increased power transmission without exceeding permissible temperatures, enabling smaller dimensions and reduced material costs, while supporting higher power levels in dynamoelectric machines by ensuring uniform thermal loading and effective cooling of brushes and brush holders.
Implementation Method 1
a cooling air flow is generated by radial and/or axial fans within or on the slip ring system
Data Source
AI summary
A slip ring system of an electrically excited dynamoelectric machine can be designed to be closed or open and includes a carrier segment configured to include a brush holder which includes a brush pocket for receiving a brush. The brush holder includes means for cooling the brush in the brush holder and/or for cooling the brush holder and has a surface-enlarging structure so as to enable a cooling air flow to be guided within the slip ring system and thereby cool the brush holder and/or brush pocket.