Inter-turn Short Circuit Detection via Time-Frequency Analysis
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Solution Overview
Problem
Conventional methods for detecting inter-turn short circuits in winding products are unreliable and require human expertise, leading to potential misidentification and increased labor costs, as they rely on subtle voltage signal differences that can be difficult to distinguish, especially in high-volume inspections.
Innovation Solution
A detecting station comprising a pulse generating module, an extracting module, and a time-frequency analysis module that applies a high voltage pulse to the winding and performs time-frequency analysis on the extracted voltage data to accurately determine the presence of an inter-turn short circuit without a comparison signal, using techniques like wavelet transform or Hilbert-Huang transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pulse resonance detection is used to detect inter-turn short circuits, then detection safety and reliability are improved, but the ability to accurately distinguish abnormal products is worsened due to tiny voltage signal differences
Solution Approach 1:
The patent transforms the detection from time-domain voltage signal comparison to frequency-domain analysis by performing FFT on the voltage signals. This dimensional transformation allows the system to identify inter-turn short circuits through frequency spectrum characteristics rather than relying on difficult-to-distinguish time-domain voltage differences, thereby improving both detection reliability and measurement precision simultaneously
2Device complexity
If conventional detection methods are used, then equipment simplicity is maintained, but the need for experienced inspectors and manual judgment increases
Solution Approach 1:
The patent replaces the mechanical/manual inspection process with automated electronic signal processing. By using FFT to convert voltage signals into frequency spectrum graphs and automatically comparing spectral characteristics, the system eliminates the need for experienced inspectors to manually judge tiny voltage differences, achieving automated detection while keeping the hardware relatively simple
Solution Approach 2:
The patent introduces frequency spectrum analysis as an intermediary between the voltage signal measurement and the final detection judgment. Instead of directly comparing raw voltage signals, the system transforms signals into the frequency domain where characteristic differences become more pronounced and easier to automate the comparison process
3Measurement precision
If high voltage pulse is applied to detect inter-turn short circuits, then detection accuracy is improved, but potential damage to the winding increases
Solution Approach 1:
The patent applies a high voltage pulse that is sufficient to reveal inter-turn short circuit characteristics through frequency spectrum analysis, but limits the pulse duration and uses protective circuitry to prevent excessive energy damage. The detection uses the pulse momentarily to excite the winding and capture the frequency response, then quickly terminates the pulse, achieving accurate detection while minimizing harmful effects
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 approach allows for safe, reliable, and accurate detection of inter-turn short circuits, reducing human error and hardware costs, enabling efficient inspection of large quantities of winding products without the need for experienced inspectors.
Implementation Method 1
a pulse generating module (202) coupled to the winding product to input a high voltage pulse to two ends of a winding (L) of the winding product
Data Source
AI summary
A detecting station of a winding product and a method for detecting an inter-turn short circuit are provided. The method includes following steps. First, a high voltage pulse is input to two ends of a winding of a winding product. Next, a voltage value of an electrifying process of the winding is extracted for generating an extracting data. Finally, a time-frequency converting operation is performed to the extracting data, and a time-frequency analysis information is generated for indicating whether or not the inter-turn short circuit is occurred in the winding.