Rotor Flange Sensor Circuit for Reliable Motor Temperature Sensing
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Solution Overview
Problem
Current electric motors face challenges in reliably measuring internal temperatures or other physical parameters due to the difficulty in securely connecting sensors to the rotor, which leads to unreliable data transmission and potential malfunctions.
Innovation Solution
Integrate sensors and an electronic circuit directly into the rotor flanges, enabling contactless communication with a stator-mounted electronic sensor via induction or NFC, ensuring reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If temperature sensors are fastened on the stator, then the installation is simple, but the temperature measurement reliability is insufficient
Solution Approach 1:
The patent replaces mechanical wire connections with contactless electromagnetic communication (induction or NFC). The electronic circuit on the rotor communicates sensor data to the stator-mounted electronic sensor without physical contact, eliminating mechanical connection issues while maintaining measurement reliability.
Solution Approach 2:
The patent introduces an electronic circuit as an intermediary between the sensor and the control system. This electronic circuit processes sensor signals and communicates them contactlessly, serving as a mediator that resolves the conflict between rotor mobility and reliable data transmission.
2Stability of the object's composition
If the control unit is positioned at the stator, then the control unit is stable, but the data transmission reliability deteriorates
Solution Approach 1:
The patent replaces mechanical wire connections for data transmission with contactless electromagnetic communication (induction or NFC). This allows the control unit to remain stable on the stator while achieving reliable data transmission from the rotating rotor through wireless electromagnetic fields.
3Measurement precision
If sensors are integrated into the rotor flange, then the measurement accuracy improves, but the device complexity increases
Solution Approach 1:
The patent merges the sensor and electronic circuit onto a single electronic support that is integrated into the rotor flange. This consolidation reduces the number of separate components and simplifies the overall structure while maintaining measurement accuracy through close proximity to the heat source.
Solution Approach 2:
The electronic support serves multiple functions: it mechanically holds the sensor, provides electrical connections, and integrates the electronic circuit for signal processing and contactless communication. This multi-functionality reduces component count and simplifies the rotor 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
Facilitates accurate and timely measurement of rotor conditions, reducing the risk of damage by overheating and enabling efficient data transfer without mechanical connections.
Implementation Method 1
contactless communication with a stator-mounted electronic sensor via induction or NFC
Data Source
AI summary
A rotor for an electric motor including: a rotor shaft rotatably mounted about an axis; a lamination stack mounted coaxially on the rotor shaft, the lamination stack including a plurality of inner cavities; a plurality of permanent magnets housed inside the inner cavities of the lamination stack; at least one flange mounted axially on the rotor shaft, at least one sensor fixed or integrated into the at least one flange, an electronic circuit electrically connected to the at least one sensor, in which the electronic circuit is secured to an electronics support fixed to an outer face of the at least one flange, the electronics support being configured to at least partially house one end of the rotor shaft.