Rotary Electric Machine Temperature Detection Coolant Splash Protection
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Solution Overview
Problem
Existing rotary electric machines fail to correctly detect the temperature of stator coils due to liquid coolant splashing onto the temperature detection elements during rotor rotation, leading to inaccurate temperature readings.
Innovation Solution
The rotary electric machine design includes a stator coil with coil end portions and drawn portions, where the temperature detection element is mounted to the drawn portions that are further protruded axially, covered by a covering member, and inserted into a through hole of a wall member, positioned deeper than the stator core opening, preventing coolant splashing and utilizing a flow direction regulation member to manage coolant dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature detection element is mounted to the coil end portions for detecting stator coil temperature, then the temperature detection function is provided, but the liquid coolant splashes onto the detection part during rotor rotation causing inaccurate temperature readings
Solution Approach 1:
The detection part of the temperature detection element is extracted from the coil end portions and relocated to the drawn portions, which extend further in the axial direction. This spatial separation removes the detection part from the harmful coolant splash zone while maintaining temperature detection capability through thermal conduction along the drawn portions.
Solution Approach 2:
The detection part is positioned in the axial direction rather than at the radial coil end portions. By utilizing the axial dimension and extending the drawn portions axially beyond the coil end portions, the detection part achieves a position that is axially deeper than the stator core side opening, creating spatial separation from the coolant splash zone in a different dimensional plane.
2Reliability
If the detection part is positioned at the coil end portions for direct temperature sensing, then temperature detection is enabled, but the device complexity increases due to additional protective structures needed
Solution Approach 1:
The drawn portions serve dual functions: they provide the mounting structure for the temperature detection element and simultaneously act as thermal conduction paths from the coil end portions to the detection part. This merging eliminates the need for separate protective structures, reducing device complexity while maintaining detection reliability.
Solution Approach 2:
The drawn portions are designed to perform multiple functions: structural support for mounting the detection element, thermal conduction from the heated coil end portions to the detection part, and positioning the detection part in a protected location. This multi-functionality reduces the need for additional protective components.
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 effectively prevents coolant from splashing onto the temperature detection element, allowing for accurate temperature detection of the stator coil while minimizing coolant loss and improving cooling efficiency by directing coolant flow and reducing agitation loss.
Implementation Method 1
a temperature detection element... for detecting temperature of a stator coil
Implementation Method 2
configured to inject a liquid coolant into a space defined by a housing
Data Source
AI summary
A detection part of a temperature detection element is mounted to ends of drawn portions which are further protruded in the axial direction than coil end portions. The detection part and the ends of the drawn portions provided with the detection part are covered with a covering member. The ends of the drawn portions provided with the detection part and covered with the covering member are inserted into a through hole of a wall member which is disposed so as to axially face an axial end face of a stator core. In this case, the detection part is located at a position deeper (on the rear side) than a position of a stator core side opening of the through hole.