Annular Stator Cooling Chamber for Clamped Electric Machines
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Solution Overview
Problem
The cooling of rotating electric machines, particularly those with a stator clamped between two clamp members, is compromised by the incompatibility of longitudinal coolant flow, leading to ineffective heat dissipation.
Innovation Solution
A rotating electric machine design featuring an annular cooling chamber surrounding the stator body, with radially projecting protuberances on the stator sheets that allow for coolant circulation and contact with the stator body, enabling efficient heat removal through a continuous annular cooling chamber defined by the stator and housing faces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stator body is clamped between two clamp members of the housing, then the stator is securely fixed in the housing, but the longitudinal flow of coolant within the channels becomes incompatible and cooling becomes problematic
Solution Approach 1:
Instead of using longitudinal coolant flow channels that are incompatible with clamping, the patent inverts the approach by creating an annular cooling chamber that allows radial or circumferential coolant flow. The stator body is clamped between two clamp members, and the annular cooling chamber is formed between the stator body outer face and the housing inner face, enabling effective cooling without compromising clamping strength.
Solution Approach 2:
The patent transitions from one-dimensional longitudinal coolant flow channels to a two-dimensional annular cooling chamber that surrounds the stator body circumferentially. This dimensional change allows coolant to flow in a different direction (radially or circumferentially) and provides better heat dissipation while being compatible with the clamping structure.
2Reliability
If longitudinal cooling channels are used in the stator body, then cooling paths are provided, but the coolant flow is incompatible with the clamping configuration
Solution Approach 1:
The annular cooling chamber serves multiple functions: it provides a coolant flow path, acts as a mounting structure for the stator body, and is compatible with the clamping configuration. The chamber is formed between the stator body outer face and the housing inner face, allowing it to perform cooling while adapting to the clamped stator configuration.
3Strength
If the stator body is clamped between clamp members, then secure fixation is achieved, but effective heat dissipation becomes problematic
Solution Approach 1:
Instead of relying on longitudinal channels that conflict with clamping, the patent inverts the cooling approach by using an annular cooling chamber that flows coolant circumferentially or radially around the stator body. This allows the clamp members to securely fix the stator while the annular chamber efficiently dissipates heat through alternative coolant flow paths.
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 design ensures uniform coolant distribution and effective heat capture over the entire circumference of the stator body, enhancing thermal management and operational efficiency.
Implementation Method 1
the stator body having an outer face extending opposite the inner face together defining an annular cooling chamber surrounding the stator body
Implementation Method 2
a coolant circulates within these channels
Data Source
AI summary
The rotating electric machine (1) having a housing comprising first (14) and second (15) clamp members and an inner face, a stator comprising a stator body (41) clamped between the first and second clamp members and having an outer face extending opposite the inner face together defining an annular cooling chamber (21) surrounding the stator body, the stator body comprising a longitudinal stack of stator sheets (410), each stator pack of which comprises an annular core having an outer circumference and at least two radially centrifugal protuberances projecting from the outer circumference of the annular core, in the annular cooling chamber, and diametrically opposite one another, the stator sheets of the longitudinal stack being identical and two adjacent stator sheet of the longitudinal stack being angularly offset from each other such that the respective protuberances thereof do not extend opposite one another.