Motor Winding Temperature Modeling for Fast Overheat Estimation
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Solution Overview
Problem
Existing techniques for preventing overheating of motor windings, such as using temperature sensors or electronic thermal methods, face challenges in accurately estimating winding temperatures, especially when physical motor parameters are unclear or when rapid temperature changes occur.
Innovation Solution
A processing apparatus that determines a calculation model for estimating winding temperatures by using a winding temperature characteristic model and a predetermined temperature characteristic model. This model is derived from the rise transitions of winding temperatures and temperatures detected by a sensor when a predetermined voltage is applied, allowing for accurate temperature estimation and suppression of excessive temperature rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is embedded in the motor to directly detect winding temperature, then temperature detection accuracy is improved, but device complexity and difficulty of proper installation increase
Solution Approach 1:
The patent uses an intermediary substance (thermal conductive paste or thermal conductive resin) between the temperature sensor and winding to improve thermal coupling. This intermediary enables accurate temperature detection without direct contact, reducing installation complexity while maintaining measurement precision.
Solution Approach 2:
The patent replaces direct mechanical embedding of temperature sensors with a non-contact thermal coupling method using conductive paste. This substitution eliminates the complexity of precise mechanical installation while achieving accurate temperature measurement through thermal conduction across the paste layer.
2Measurement precision
If a temperature sensor is used to detect winding temperature, then temperature detection capability is improved, but response delay increases due to heat capacity and sensor response time
Solution Approach 1:
The patent applies thermal conductive paste in advance to create an optimized thermal pathway before temperature detection begins. This preliminary action reduces thermal resistance and accelerates heat transfer from the winding to the sensor, decreasing response time while maintaining detection accuracy.
Solution Approach 2:
The patent changes the thermal parameters of the interface between sensor and winding by introducing conductive paste with optimized thermal conductivity. This parameter change improves heat transfer efficiency, reducing the thermal time constant and enabling faster temperature detection response.
3Device complexity
If electronic thermal method is used without clear motor parameters, then device complexity is reduced, but temperature estimation accuracy deteriorates
Solution Approach 1:
The patent incorporates feedback from the temperature sensor into the electronic thermal model. The sensor provides actual temperature data that feeds back to correct and refine the estimated temperature values, improving accuracy while maintaining the simplicity of the electronic thermal approach.
Solution Approach 2:
The patent merges the electronic thermal estimation method with temperature sensor measurement. By combining the model-based estimation with actual sensor data, the system achieves high temperature estimation accuracy without requiring complete motor parameter specifications, maintaining system simplicity.
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 proposed solution enables accurate estimation of winding temperatures in electronic thermal management of motors, effectively suppressing overheating and preventing winding burnout, even under conditions of rapid temperature change.
Implementation Method 1
a temperature sensor (3) disposed in the vicinity of the winding
Implementation Method 2
voltage application for raising the temperature of the winding to a predetermined temperature
Data Source
AI summary
A processing apparatus acquires a first rise transition that is a rise transition of the temperature of a winding and a second rise transition that is a rise transition of the temperature detected by a temperature sensor in a state where voltage application for raising the temperature of the winding to a predetermined temperature is performed, determines a predetermined temperature characteristic model by calculating a predetermined parameter on the basis of the second rise transition, and further determines a winding temperature characteristic model by calculating a winding related parameter on the basis of the first rise transition.