NdFeB Magnet Demagnetization Detection by Magnetic Pole Distribution
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Solution Overview
Problem
Current methods for evaluating the demagnetization state of grain boundary diffusion NdFeB magnets are inefficient, damaging the magnets, and require extensive resource consumption, making it difficult to assess internal demagnetization without disassembling the magnet.
Innovation Solution
A method involving the application of a reverse magnetic field to a saturation-magnetized grain boundary diffusion NdFeB magnet, observing the magnetic pole distribution on non-diffusion faces, which determines irreversible demagnetization without damaging the magnet, using devices like magnetic field distribution visualization tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnet is cut into layers for detection, then the coercivity of each layer can be detected and analyzed, but the detection efficiency is low and the magnet is damaged
Solution Approach 1:
The patent replaces the mechanical cutting method with a magnetic field-based detection method. Instead of physically dividing the magnet into layers, the invention uses magnetic field distribution visualization to detect demagnetization states, thereby maintaining detection precision while eliminating the need for repeated cutting operations and improving detection efficiency.
Solution Approach 2:
The patent introduces magnetic field distribution as an intermediary to detect the internal state of the magnet. By visualizing the magnetic field distribution on the surface, the internal demagnetization state can be inferred without physical dissection, allowing for non-destructive and efficient detection.
2Measurement precision
If the magnet is cut into layers for detection, then the coercivity of each layer can be detected and analyzed, but the magnet is damaged and cannot be used further
Solution Approach 1:
The patent replaces the mechanical cutting method with a magnetic field-based detection method. Instead of physically dividing the magnet into layers, the invention uses magnetic field distribution visualization to detect demagnetization states, thereby maintaining detection precision while eliminating the need for repeated cutting operations and improving detection efficiency.
Solution Approach 2:
The patent creates a magnetic field distribution map (visual copy) of the magnet's surface to represent the internal demagnetization state. This magnetic field map serves as a non-destructive copy that contains the diagnostic information needed, eliminating the need to physically destroy the original magnet for analysis.
3Measurement precision
If large equipment such as VSM, PPMS, MPMS is used for detection, then accurate measurement can be obtained, but resource consumption is high
Solution Approach 1:
The patent employs simple, low-cost magnetic field distribution visualization tools instead of expensive large-scale equipment like VSM or PPMS. These simpler tools consume fewer resources and can be used repeatedly for detection, making the process more accessible and resource-efficient while still providing accurate demagnetization assessment.
Solution Approach 2:
The patent introduces magnetic field distribution as an intermediary to detect the internal state of the magnet. By visualizing the magnetic field distribution on the surface, the internal demagnetization state can be inferred without physical dissection, allowing for non-destructive and efficient detection.
4Measurement precision
If the magnet is cut into layers for detection, then the coercivity of each layer can be detected and analyzed, but it does not consider the effect of large casing and leads to inaccurate analysis
Solution Approach 1:
The patent creates a detection method that works for magnets of various sizes and configurations without requiring physical dissection or removal from their casings. The magnetic field distribution visualization technique is universally applicable and preserves the contextual information about the magnet's actual installation environment, leading to more accurate and practical analysis.
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 method allows for accurate, non-destructive assessment of demagnetization with high efficiency, maintaining the integrity of the magnet and reducing resource consumption, and is applicable to magnets of various sizes and temperatures.
Implementation Method 1
applying a reverse magnetic field to a saturation-magnetization grain boundary diffusion NdFeB magnet, and, if a number of magnetic poles on a non-diffusion face of the grain boundary diffusion NdFeB magnet is increased and divided into layers
Implementation Method 2
A method for identifying an irreversible demagnetization of grain boundary diffusion NdFeB magnet includes applying a reverse magnetic field to a saturation-magnetization grain boundary diffusion NdFeB magnet
Data Source
AI summary
The present application relates to a technical field of determining an irreversible demagnetization of a grain boundary diffusion NdFeB magnet, and more particularly, to a method for identifying an irreversible demagnetization of a grain boundary diffusion NdFeB magnet by magnetic field distribution. After applying a reverse magnetic field to a saturatedly magnetized grain boundary diffusion NdFeB magnet, if a number of magnetic poles on a non-diffusion face of the grain boundary diffusion NdFeB magnet is increased, it is determined that there is an irreversible demagnetization in the grain boundary diffusion NdFeB magnet.