Coil Temperature Sensor Mounting for Vibration-Stable Motor Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature sensors in rotary electric machines face challenges such as displacement due to external forces like vibration, high costs associated with metal brackets, and complex installation and detachment processes.
Innovation Solution
A temperature sensor design featuring a thermosensitive element with an elastic covering body and a resin holder, where the covering body is inclined relative to the temperature measurement region, allowing easy attachment and detachment while preventing displacement, and reducing costs by omitting metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal bracket is used to support the temperature sensor, then the sensor is prevented from being displaced by vibration, but the cost increases
Solution Approach 1:
The patent replaces expensive metal brackets with a resin holder that is sufficiently durable for the application. The holder is designed to be cost-effective while maintaining the necessary mechanical strength to prevent sensor displacement during vibration, directly addressing the cost reduction goal without sacrificing reliability
Solution Approach 2:
The patent employs a composite structure combining resin material with strategic metal components or reinforcement elements within the holder. This allows the primary structure to be made of low-cost resin while incorporating metal only where absolutely necessary for structural integrity, achieving a balance between cost and vibration resistance
2Measurement precision
If the temperature sensor is inserted into the gap between coils, then the sensor can detect coil temperature, but the attachment process becomes complicated and positioning becomes difficult
Solution Approach 1:
The patent introduces a dedicated resin holder as an intermediary component that simplifies the attachment process. The holder serves as a mounting platform with pre-formed positioning features that guide the sensor element to the correct location on the coil, eliminating the complexity of direct insertion and positioning while maintaining accurate temperature detection
Solution Approach 2:
The patent divides the temperature sensor into separable components: a sensor element and a holder. The holder is designed as a separate attachment component with integrated positioning features, allowing the sensor to be mounted without complex manipulation. This segmentation enables simple attachment by securing the holder to the coil rather than positioning the entire sensor assembly
3Measurement precision
If the temperature sensor is inserted into the gap between coils, then the sensor can detect coil temperature, but detaching the sensor after installation becomes difficult
Solution Approach 1:
The patent designs the holder with dynamic attachment characteristics - using elastic deformation or flexible mounting mechanisms that allow easy installation but provide stable operation. The holder can be temporarily deformed during attachment/detachment but maintains rigid positioning during operation, enabling simple removal after installation while ensuring stable temperature detection during use
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
The sensor effectively maintains position during vibrations, simplifies installation and removal, and enhances temperature detection accuracy and responsiveness by ensuring adequate heat transfer contact with the coil.
Implementation Method 1
When the holder is elastically deformed, a temperature detection unit of the temperature sensor comes into contact with the coil through the resin layer
Implementation Method 2
a temperature detection unit of the temperature sensor comes into contact with the coil through the resin layer
Data Source
AI summary
A temperature sensor detecting a temperature of a coil provided in a stator of a rotary electric machine includes a sensor element and a holder made of a resin. The sensor element includes a thermosensitive body, electric wires connected to the thermosensitive body, and a covering body having an elongated shape and covering the thermosensitive body, clad wires, and a part of lead wires. The holder holds one end region of the covering body on the electric wire side in a state where a longitudinal direction of the covering body is inclined relative to a temperature measurement object region of the coil. The holder is attached to the rotary electric machine in such a manner that another end region of the covering body on the thermosensitive body side is in contact with the temperature measurement object region.