Stator Winding Temperature Probe with Protective Coating
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Solution Overview
Problem
Existing rotating electrical machines face challenges in accurately measuring the temperature of their stator windings, which can lead to overheating and damage if not managed properly.
Innovation Solution
A stator design where the temperature measurement probe is placed in direct thermal contact with the winding, encapsulated in a protective coating, and electrically connected to ensure reliable and accurate temperature readings, using a negative thermal coefficient sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature measurement probe is placed in direct thermal contact with the winding, then the temperature measurement precision is improved, but the reliability of the sensitive element deteriorates due to exposure to harsh thermal and electrical environments
Solution Approach 1:
A coating layer is introduced as an intermediary between the sensitive element and the winding. This coating provides thermal contact for accurate temperature measurement while simultaneously protecting the sensitive element from direct exposure to harsh thermal and electrical environments, thus resolving the contradiction between measurement precision and reliability
Solution Approach 2:
A thin coating layer is applied to the sensitive element, allowing thermal contact with the winding for accurate temperature sensing while the coating itself acts as a protective barrier. The thin film structure ensures good thermal conductivity for measurement while providing necessary protection to maintain reliability
2Reliability
If the sensitive element is encapsulated in a coating, then the reliability of the sensitive element is improved, but the thermal contact between the probe and winding may deteriorate
Solution Approach 1:
The coating material and its thermal properties are carefully selected and controlled to ensure that while the coating provides protection (improving reliability), its thermal conductivity is sufficient to maintain accurate temperature measurement. The coating parameters are optimized to balance protection and thermal contact
3Reliability
If the coating coats the junction points, then the reliability of electrical connections is improved, but the manufacturing complexity increases
Solution Approach 1:
The coating process is integrated to simultaneously protect both the sensitive element and the junction points in a single manufacturing step. This merging of protection functions reduces the overall manufacturing complexity compared to applying separate coating processes for different 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 design allows for precise temperature monitoring of the stator winding, preventing overheating and ensuring the reliable operation of the rotating electrical machine.
Implementation Method 1
the measurement probe being arranged at one end of one of the electrical conductors... the sensitive element which measures the temperature to be as close as possible to the winding of the stator and in particular directly in thermal contact with this winding
Implementation Method 2
the measurement probe is a negative thermal coefficient (NTC) sensor
Data Source
Figure 1
Figure 2~3
AI summary
The present invention proposes a stator for a rotating electric machine of a motor vehicle, the stator (5) comprising: - an electrical winding (16), this winding comprising a plurality of electrical conductors (22), - at least one temperature measuring probe (23) comprising at least one sensitive element (24) arranged so as to be in contact with at least one electrical conductor (22) of the winding (16) to measure the temperature of said winding.