Wireless Magnetic Flaw Detection Using Halbach Array
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Solution Overview
Problem
Existing electromagnetic inspection (EMI) methods for detecting flaws in metallic structures, such as rods, pipes, and cables, are limited by the need for externally powered magnetizing coils, which are cumbersome, require significant power, and cannot easily inspect continuous sections without starting from an end.
Innovation Solution
A magnetic inspection system utilizing a wireless energizing unit with a ring of permanent magnets arranged in a Halbach array to produce a planar magnetic field, allowing for inspection of ferromagnetic materials without the need for external power sources and enabling inspection of continuous sections without starting from an end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If externally powered magnetizing coils are used to induce magnetic field, then magnetic field strength can be controlled, but the system becomes complex and requires large power source making it difficult to transport
Solution Approach 1:
The patent extracts the power source requirement from the magnetizing coil system by using permanent magnets instead of externally powered coils. This removes the need for large power sources and complex power control systems while maintaining the ability to generate the required magnetic field for inspection.
Solution Approach 2:
The permanent magnets are self-powered, generating their own magnetic field without requiring external power sources. This self-service characteristic eliminates the need for complex power supply systems and makes the device portable and easy to transport to field locations.
2Power
If solid ring magnetizing coils are used, then magnetic field can be induced, but inspection must start from end of piece limiting inspection of continuous sections
Solution Approach 1:
The inspection system is divided into multiple sensor units that can be positioned at different locations along the continuous section. Each sensor unit with its permanent magnet array can independently inspect a specific segment, allowing continuous inspection without requiring to start from the end of the piece.
Solution Approach 2:
The patent transitions from linear end-to-end inspection to multi-position parallel inspection by arranging sensor units at different angular positions around the continuous section. This dimensional change allows simultaneous inspection of multiple segments, greatly improving inspection flexibility and efficiency.
3Power
If externally powered magnetizing coils are used, then magnetic field can be induced, but power cables and large power source make the system difficult to transport
Solution Approach 1:
The patent removes the heavy power source and power cables from the system by using permanent magnets that generate magnetic field without external power. This extraction of the power subsystem dramatically reduces the weight and improves portability, allowing the inspection device to be easily transported to field locations.
4Reliability
If traditional EMI methods are used, then flaws can be detected, but the system requires adequate power control making it difficult to use in the field
Solution Approach 1:
The permanent magnets provide self-powered magnetic field generation, eliminating the need for complex power control systems. This simplifies the operation and makes the device easily usable in field conditions where power sources may be limited or unavailable, while maintaining reliable flaw detection capability.
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
The system effectively detects flaws in ferromagnetic materials by producing a planar magnetic field that can be rotated and positioned to inspect continuous sections, providing efficient and portable flaw detection capabilities.
Implementation Method 1
at least one wireless energizing unit configured to produce a planar magnetic field in a part of interest
Implementation Method 2
a plurality of permanent magnets circumferentially spaced around the ring between the inside diameter and the outside diameter where each of the plurality of permanent magnets is oriented such that the magnetic field of each of the permanent magnets is directed in a predetermined direction
Implementation Method 3
The magnetic parameter is any of a magnetic flux, a magnetic flux density and a magnetic flux leakage. The magnetic flux leakage is used to determine a flaw in the part of interest
Data Source
AI summary
Apparatus and methods for detecting flaws in objects comprised of ferromagnetic materials are disclosed. A wireless energizing unit is disclosed that includes an array of permanent magnets is used to induce a magnetic field into the objects and transducers are configured to detect a magnetic flux property in the presence of a flaw in the object. Embodiments that are configured to be clamped over the object are also disclosed. In addition, methods for retrofitting EMI detection systems with a wireless energizing unit are disclosed.