Rotor Flange Sensor Layout for Reliable Motor Temperature Detection
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Solution Overview
Problem
Current electric motor rotors face challenges in reliable temperature measurement due to the difficulty of installing temperature sensors directly on the rotor, leading to inadequate overheating detection and potential damage from thermal issues.
Innovation Solution
Incorporating sensors into the front and rear flanges of the rotor shaft, which are axially mounted on either side of the lamination stack, allowing for more accurate temperature measurement and early detection of overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are installed on the stator, then the motor structure remains simple, but the temperature measurement reliability deteriorates
Solution Approach 1:
The patent uses the flange as an intermediary structure to mount temperature sensors. The flange serves as a mediator between the rotor body and the sensors, allowing thermal contact while providing a convenient mounting surface. This resolves the contradiction by enabling reliable temperature measurement without requiring direct integration into the rotor core structure.
Solution Approach 2:
The patent moves the sensor mounting location from the radial dimension (directly on rotor or stator) to the axial dimension (on the flange). By utilizing the axial extension provided by the flange structure, the solution achieves reliable temperature measurement while keeping the main rotor-stator structure simple.
2Measurement precision
If sensors are fastened on the stator, then the installation process is simple, but the temperature detection accuracy deteriorates
Solution Approach 1:
The flange acts as an intermediary platform that brings the sensor into close proximity with the rotor's thermal mass. This intermediary structure enables accurate temperature detection while maintaining simple sensor fastening procedures through standard mounting techniques on the flange surface.
3Reliability
If temperature sensors are installed close to the rotor core, then the overheating detection capability improves, but the structural complexity increases
Solution Approach 1:
The patent utilizes the axial dimension by extending the flange structure to provide sensor mounting locations close to the rotor core. This dimensional approach allows accurate overheating detection without complicating the radial or circumferential structure of the rotor-stator assembly.
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 enables reliable physical parameter measurements within the rotor, including temperature, thereby reducing the risk of damage from overheating by providing timely detection and alerting mechanisms.
Implementation Method 1
said at least one thermal measurement sensor is positioned on the flange so as to be in contact with a permanent magnet
Data Source
AI summary
A rotor for an electric motor includes a rotor shaft rotatably mounted about an axis; and a lamination stack mounted coaxially on the rotor shaft. The lamination stack includes inner cavities; permanent magnets housed inside the inner cavities of the lamination stack; and a front flange and a rear flange mounted coaxially on the rotor shaft and arranged axially on either side of the lamination stack. At least one amongst the front flange and the rear flanges is equipped with at least one sensor.