Stator Core Magnetic Flux Sensing for Abnormality Localization
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Solution Overview
Problem
Conventional abnormality detection systems for rotary electrical machines are complex and costly, making it difficult to accurately detect stator core abnormalities, particularly in identifying the circumferential position and details of the abnormality, and are limited by the placement and expense of magnetic flux detection coils.
Innovation Solution
A system comprising multiple magnetic flux sensors disposed on the back of the stator core in the circumferential or axial direction, generating composite or differential signals from the sensors' outputs to detect abnormalities, with a signal processing unit that corrects phase shifts and raises alerts when signal thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic flux detection coils are used for abnormality detection, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses multiple magnetic flux sensors to detect magnetic flux at different positions around the stator core, creating simplified detection points that collectively provide comprehensive abnormality detection without requiring complex coil assemblies. Each sensor provides a simplified measurement that contributes to overall detection accuracy.
Solution Approach 2:
The detection system is segmented into multiple independent magnetic flux sensors positioned at different locations (e.g., 12 o'clock, 3 o'clock, 6 o'clock, 9 o'clock positions). This segmentation allows the complex detection task to be divided into simpler individual sensor measurements that can be processed separately and combined for final abnormality determination.
2Loss of information
If multiple magnetic flux sensors are deployed, then abnormality position identification is improved, but device complexity increases
Solution Approach 1:
The patent transitions from single-point detection to multi-dimensional spatial detection by placing sensors at multiple angular positions around the stator core. This dimensional expansion from one point to multiple points in space enables the system to identify not only the presence but also the specific angular position of abnormalities, providing comprehensive spatial information.
Solution Approach 2:
The patent introduces a signal processing unit that acts as an intermediary between the multiple magnetic flux sensors and the abnormality detection logic. This intermediary processes the signals from multiple sensors, combines them appropriately, and determines abnormality positions, thereby managing the complexity of multiple sensor inputs without requiring complex hardware arrangements.
3Reliability
If conventional detection systems are used, then system structure is simple, but abnormality detection reliability is insufficient
Solution Approach 1:
The patent merges multiple magnetic flux sensor measurements into a unified abnormality detection system. By combining the outputs from multiple sensors positioned at different locations, the system achieves reliable abnormality detection that overcomes the limitations of single-sensor approaches, while the merging process is managed through systematic signal combination rather than complex integration.
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 reliable and accurate detection of stator core abnormalities with a simple configuration, allowing for precise identification of abnormality positions and reducing operational costs by using a more straightforward setup of magnetic flux sensors.
Implementation Method 1
a plurality of magnetic flux sensors S disposed at intervals on a back of a stator core 3 in a circumferential direction or an axial direction of the stator core 3, and configured to detect a magnetic flux
Data Source
AI summary
In general, according to one embodiment, there is provided an abnormality detection system of a rotary electrical machine. The system includes a plurality of magnetic flux sensors disposed at intervals on a back of a stator core in a circumferential direction or an axial direction, and configured to detect a magnetic flux, and an abnormality detection apparatus configured to detect an abnormality of the stator core from a predetermined event that appears in a composite signal or a differential signal obtained from signals respectively output from at least two magnetic flux sensors of the plurality of magnetic flux sensors.