Rotating Electrical Machine Spoke Heat Sink Design
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Solution Overview
Problem
Conventional rotating electrical machines face challenges in enhancing cooling ability without increasing mechanical noise and air flow resistance, particularly due to the heat generated by the stator and external electrical devices, which affects the temperature of the rotating shaft and bearing.
Innovation Solution
The design incorporates a housing with air inlets and outlets, radial spokes, and heat sinks with fins that expose cooling air to the heat sinks, allowing efficient heat dissipation from the stator to the bearing, thereby reducing heat transmission to the rotating shaft and minimizing thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat dissipating fins are arranged on the bearing box to increase surface area for heat dissipation, then heat dissipation ability is improved, but air flow resistance increases which deteriorates cooling effects
Solution Approach 1:
The bearing box is divided into multiple segments with heat dissipating fins arranged on different surfaces (side surface and end surface). This segmentation allows heat to be dissipated through multiple pathways simultaneously, increasing overall heat dissipation ability without requiring excessive surface area on a single location, thereby maintaining better air flow characteristics.
Solution Approach 2:
Heat dissipation is extended from a single-dimensional arrangement to multi-dimensional arrangement by placing fins on both the side surface and end surface of the bearing box. This spatial distribution of heat dissipation surfaces improves cooling efficiency without concentrating excessive surface area in one location, reducing air flow resistance.
2Temperature
If a cooling fan is added to enhance cooling ability, then heat dissipation is improved, but mechanical noise increases
Solution Approach 1:
The bearing box itself serves as a heat dissipation component through integrated fins, eliminating the need for separate active cooling devices like cooling fans. The structure performs its own cooling function passively through natural convection and radiation, reducing mechanical noise while maintaining effective heat dissipation capability.
3Adaptability or versatility
If electrical devices are secured to the case for electrical connection, then electrical functionality is improved, but heat generation increases which requires additional cooling
Solution Approach 1:
The heat dissipation function is merged with the electrical device mounting structure. Electrical devices are secured to the bearing box which already possesses heat dissipation capabilities through its fins. The mounting structure and cooling structure are combined into a single integrated component, allowing electrical devices to utilize the bearing box's heat dissipation capacity without requiring separate cooling solutions.
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 configuration enhances the heat dissipation ability of the electrical rotating machine, reducing heat transmission to the bearings and rotating shaft, ensuring stable operation while minimizing mechanical noise and air flow resistance.
Implementation Method 1
Each of the heat sinks is equipped with fins exposed to the air inlet, thereby achieving heat dissipation in the air inlet. In other words, the fins are exposed to a flow of cooling air entering the air inlet, thereby dissipating the from the spoke to minimize transmission of the heat to the bearing.
Implementation Method 2
heat sinks each of which is equipped with fins. Each of the heat sinks is disposed on a respective one of the spokes.
Data Source
AI summary
An electrical rotating machine includes a housing which has a bearing mounted on a wall thereof. The housing also has a plurality of air inlets, a plurality of air outlets, and spokes. The spokes extend from the bearing in a radial direction of the housing to isolate the air inlets from each other in a circumferential direction of the housing. Each of the spokes is equipped with a heat sink exposed to a flow of cooling air entering the housing through the air inlet to dissipate heat, as transmitted to the spoke, thereby minimizing transfer of the heat to the bearing through the spokes.