Profiled Bearing Housing Cooling Passage for Overheating Control
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Solution Overview
Problem
Rolling bearings in electrical machines tend to overheat due to heavy loading, leading to potential damage and energy losses, which existing cooling methods fail to adequately address.
Innovation Solution
A housing for the bearing with a radially inner annular surface and a cooling passage featuring a profiled surface with protrusions and channels to enhance heat transfer, allowing efficient fluid flow and reducing turbulence, thereby preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional cooling passage is used, then the structure is simple, but the heat transfer efficiency is insufficient leading to bearing overheating
Solution Approach 1:
The cooling passage incorporates a profiled surface with varying geometry along its length, creating localized regions with different heat transfer characteristics. The profiled surface features protrusions and recesses that concentrate cooling fluid flow at specific locations where heat generation is highest, rather than using a uniform cooling structure throughout.
Solution Approach 2:
The cooling passage transitions from a conventional two-dimensional cross-sectional shape to a three-dimensional profiled structure with protrusions extending into the passage. This adds a radial dimension to the cooling surface area, increasing the contact between the cooling fluid and the bearing housing without significantly increasing the overall passage volume.
2Loss of energy
If the cooling passage surface area is increased to improve heat transfer, then cooling efficiency improves, but fluid flow resistance increases causing turbulence
Solution Approach 1:
The profiled surface modifies the geometric parameters of the cooling passage, including the radius, height, and spacing of protrusions. These parameter variations are optimized to increase surface area for heat transfer while maintaining smooth transitions that prevent flow separation and turbulence. The gradual changes in cross-sectional area along the passage length help maintain laminar flow conditions.
3Force
If heavy loading is applied to the bearing, then the machine can handle higher loads, but the bearing generates excessive heat
Solution Approach 1:
The profiled cooling passage acts as an intermediary thermal management system between the heavily loaded bearing and the cooling fluid. It provides a controlled interface for heat transfer, using the profiled surface to optimize the coupling between the bearing housing and cooling fluid, enabling efficient heat removal while the bearing handles high 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
The housing effectively reduces power losses and extends the lifespan of bearings by efficiently transferring heat away from the bearing, maintaining operational efficiency and reducing wear on the housing.
Implementation Method 1
The housing may be in direct contact with the bearing such that heat may be transferred efficiently (for example by conduction) from the bearing to the housing
Implementation Method 2
a cooling passage extending through the housing and around the radially inner annular surface; an inlet for fluid to flow into the cooling passage; and an outlet for fluid to flow out of the cooling passage
Data Source
Figure 1
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AI summary
A housing (2) for a bearing (38) is provided, the housing (2) comprising: a radially inner annular surface (54A) extending around a central axis (X-X) and adapted to receive a radially outer surface of a bearing (38); a cooling passage (34) extending through the housing (2) and around the radially inner annular surface (54A); an inlet (62A) for fluid to flow into the cooling passage (34); and an outlet (62B) for fluid to flow out of the cooling passage (34), wherein the cooling passage (34) comprises a profiled surface.