Rotary Electric Machine Coil Sensor Mounting for Accurate Temperature Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotary electric machines face challenges in accurately determining the temperature of the coil due to the influence of cooling liquid on temperature sensors, leading to inaccurate readings.
Innovation Solution
A rotary electric machine design with a recess groove on the coil surface for the temperature sensor, covered by a holding member, and positioned to face the cooling liquid flow path, allowing accurate temperature determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the temperature sensor is arranged to face the flow path of cooling liquid for efficient cooling, then the cooling efficiency is improved, but the temperature sensor readings are greatly affected by the cooling liquid temperature and do not reflect the actual coil heat generation state
Solution Approach 1:
The recess groove acts as an intermediary structure that allows the temperature sensor to indirectly measure coil temperature through contact with the coil surface, while the holding member serves as a mediator that positions the sensor optimally without direct exposure to cooling liquid, thus resolving the conflict between cooling efficiency and measurement accuracy
2Measurement precision
If the temperature sensor is covered by a holding member to protect it from cooling liquid, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The holding member functions as a protective shell that covers the temperature sensor, preventing direct contact with cooling liquid while allowing thermal contact with the coil through the recess groove interface, thus protecting the sensor without significantly complicating the overall device structure
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
Enables quick and precise temperature measurement of the coil by minimizing the impact of cooling liquid temperature on sensor readings, while maintaining efficient cooling through a liquid flow path.
Implementation Method 1
a flow path of a cooling liquid for cooling the stator is provided in the inner portion
Implementation Method 2
a temperature sensor that is in contact with the coil at a position facing the flow path and determines the temperature of the coil
Data Source
AI summary
A rotary electric machine includes a stator, a rotor, a rotary electric machine case, and a temperature sensor. The stator has a stator core and a coil. The rotor rotates relative to the stator. The rotary electric machine case has an inner portion that accommodates the stator and the rotor, and a flow path of a cooling liquid for cooling the stator is provided in the inner portion. The temperature sensor is in contact with the coil at a position facing the flow path of the cooling liquid and determines the temperature of the coil. A recess groove is provided on an outer surface of the coil. An outside of the temperature sensor is covered by a holding member in a state where the temperature sensor is in contact with an inner surface of the recess groove of the coil, and the temperature sensor is attached to the coil via the holding member.