Stator Winding Temperature Detection with Coolant Shielding
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Solution Overview
Problem
In rotating electric machines, the temperature detecting element is often hit by liquid coolant during cooling, leading to inaccurate temperature detection and potential heat-related damage, which can limit the machine's performance and increase costs due to the need for additional components and increased physical size.
Innovation Solution
The stator winding's input and output lines are strategically positioned vertically above the temperature detecting element, preventing the liquid coolant from hitting it, thus allowing for more accurate temperature detection without the need for additional components or increased size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature detecting element is exposed to detect stator winding temperature, then temperature detection capability is improved, but the detecting element is hit by liquid coolant causing measurement error
Solution Approach 1:
The patent introduces an intermediary structure (the specific spatial arrangement where input/output lines are positioned vertically above the temperature detecting element) that allows the detecting element to remain exposed to the stator winding for accurate temperature measurement while preventing direct contact with liquid coolant. The input/output lines act as a protective barrier or guide that redirects coolant flow away from the detecting element.
Solution Approach 2:
The patent utilizes vertical positioning (another dimension) to resolve the conflict. By placing the input and output lines vertically above the temperature detecting element in the axial direction, the design creates a three-dimensional arrangement where coolant flowing along the winding does not directly hit the detecting element, while the element remains in position to detect winding temperature accurately.
2Measurement precision
If a coolant guiding member is added to protect the temperature detecting element, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the input and output lines serve a dual function: their primary function of electrical connection is maintained, and they additionally serve to protect the temperature detecting element from coolant by positioning them vertically above it. This eliminates the need for separate protective components, reducing device complexity and cost while maintaining measurement accuracy.
Solution Approach 2:
The temperature detecting element is protected from coolant interference by the existing input and output lines of the stator winding itself, rather than requiring external protective structures. The system uses its own components (the lines) to solve the protection problem, eliminating the need for additional dedicated protective elements.
3Measurement precision
If additional protective components are added, then temperature detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The input and output lines perform multiple functions: electrical connection and protection of the temperature detecting element. By making existing components multi-functional, the patent avoids additional manufacturing costs associated with separate protective parts while ensuring accurate temperature detection.
Solution Approach 2:
The protective function is merged with the existing input and output lines rather than being implemented as a separate component. This consolidation reduces the total number of parts, simplifies manufacturing processes, and lowers assembly costs while maintaining the ability to detect temperature accurately.
4Measurement precision
If additional protective components are added, then temperature detection accuracy is improved, but physical size increases
Solution Approach 1:
The existing input and output lines are utilized for dual purposes (electrical connection and protection), eliminating the need for additional protective components that would increase the machine's physical size. The protective function is achieved within the existing spatial envelope of the winding structure.
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 enables precise temperature detection of the stator winding, improving the machine's performance by preventing coolant-induced errors and reducing costs and physical complexity.
Implementation Method 1
using a cooling apparatus that cools the stator by dripping a liquid coolant onto the coil end portions of the stator winding
Implementation Method 2
a temperature detecting element that is set in the stator winding
Data Source
AI summary
A rotating electric machine includes a rotor, a stator, a temperature detecting element, and a cooling apparatus. The stator includes a stator core that is disposed so as to oppose the rotor in a radial direction of the rotating electric machine, and a stator winding that is wound around the stator core. The temperature detecting element is set in the stator winding. The cooling apparatus drips a liquid coolant onto coil end portions of the stator winding, thereby performing cooling. The stator winding has a plurality of input and output lines that are electrically connected to an external apparatus. At least one input or output line among the plurality of input and output lines is disposed vertically above the temperature detecting element.