Resin Outer Case Linear Expansion Control for Temperature Sensor Contact Stability
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Solution Overview
Problem
Existing rotating electric machines face challenges in maintaining stable contact between temperature sensors and detection objects, leading to instability in temperature detection, particularly in high-temperature operating conditions.
Innovation Solution
The implementation of a temperature detector system with a resin outer case and inner case, where the linear expansion coefficient of the outer case is adjusted to maintain stable contact with the installation portion, ensuring accurate temperature detection across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is used to detect temperature, then temperature detection is enabled, but stable contact between the temperature sensor and the detection object cannot be maintained in high-temperature environments
Solution Approach 1:
The patent changes the physical parameter of the resin outer case by controlling its linear expansion coefficient to be equal to or smaller than that of the installation portion. This parameter change ensures that when temperature increases, the outer case does not expand more than the installation portion, thereby maintaining stable contact between the temperature sensor and the detection object throughout the temperature range.
Solution Approach 2:
The patent uses a resin outer case as a composite material structure that encloses both the temperature sensor and the installation portion. The resin material is specifically selected or formulated to have appropriate thermal expansion characteristics, creating a composite structure that maintains contact stability under temperature variations while protecting the internal components.
2Reliability
If the linear expansion coefficient of the outer case is reduced to maintain contact stability, then contact stability improves, but the outer case material selection and manufacturing become more constrained
Solution Approach 1:
The patent establishes a clear design criterion that the linear expansion coefficient of the outer case should be equal to or smaller than that of the installation portion. This parameter specification guides material selection and manufacturing processes, making it easier to choose from various resin materials that meet this criterion while ensuring contact stability across different manufacturing contexts.
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 ensures reliable and stable temperature detection, enhancing the protection control of the rotating electric machine by maintaining contact between the temperature sensor and the installation portion, even in high-temperature environments.
Implementation Method 1
when a linear expansion coefficient of the outer case in a temperature range is equal to or smaller than a composite linear expansion coefficient
Data Source
AI summary
A temperature sensor in a rotating electric machine is disposed or installed on a surface of a temperature detection object. The temperature detection object, i.e., an installation portion, has a thickness. The temperature sensor has an inner case housing a detector element. The inner case is made of resin. The inner case has a thickness. A temperature detecting device has an outer case housing the temperature sensor. The outer case is made of resin. A linear expansion coefficient of the outer case is, within a certain temperature range including a threshold temperature for a protection of the rotating electric machine, is smaller than an average of linear expansion coefficients of the installation portion and the inner case.