Composite Permanent Magnet Material Design
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Solution Overview
Problem
The existing permanent magnetic materials for motors lack flexibility in magnetic property adjustment, with a significant gap between sintered NdFeB and bonded NdFeB, restricting magnetic circuit design and application, and the high cost of rare earth magnets hinders the development of light, thin, and small automatic appliances.
Innovation Solution
A composite permanent magnet material is formed by splicing sliced permanent magnets of different materials with a binding agent, allowing for adjustable magnetic properties and reduced costs by using a combination of isotropic and anisotropic sintered and bonded magnets, such as ferrite, NdFeB, and SmCo, with anaerobic adhesive for bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If sintered NdFeB with high magnetic energy product is used, then magnetic performance is improved, but cost increases significantly
Solution Approach 1:
The permanent magnet is divided into multiple segments with different magnetic properties (high magnetic energy product segments and low magnetic energy product segments) arranged in specific patterns. This segmentation allows different material grades to be used in different regions, reducing overall cost while maintaining necessary magnetic performance.
Solution Approach 2:
Different regions of the permanent magnet are assigned different material properties. High magnetic energy product materials are placed where strong magnetic fields are needed, while lower grade materials are used in regions where weaker fields suffice. This local differentiation optimizes both performance and cost.
2Ease of manufacture
If uniform permanent magnetic material is used, then manufacturing is simplified, but magnetic property adjustment flexibility is reduced
Solution Approach 1:
The magnet is segmented into multiple sections that can be independently selected and arranged. This allows flexible combination of different material types and grades to achieve desired magnetic properties for different application requirements.
Solution Approach 2:
The permanent magnet uses a composite structure combining different magnetic materials (e.g., sintered NdFeB, bonded NdFeB, ferrite) with distinct magnetic properties. This composite approach enables tailored magnetic characteristics while maintaining manufacturability through modular assembly.
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 composite magnet material enhances magnetic performance, fills the property gap between bonded and sintered NdFeB, and reduces costs by allowing for adjustable magnetic properties, providing broader material and cost selection options for motor design.
Implementation Method 1
A composite permanent magnet material is formed by splicing sliced permanent magnets of different materials with a binding agent
Data Source
AI summary
The invention relates to the field of permanent magnet materials, and discloses a composite permanent magnet material. The material is formed by splicing at least one permanent magnet material, with binding agent in between. The novel composite permanent magnet material that is formed by splicing different magnets greatly enriches the existing permanent magnet system and can completely replace the expensive rare metallic magnetic material. The composite permanent magnet material disclosed by the invention has high performances. The magnetic performance of the magnet can be regulated and controlled by adjusting the type and length of the magnets. In particular, the magnetic blank between the bonded NdFeB and the sintered NdFeB provides the designer and user of permanent magnetic motors with broader and flexible in material selection space and cost selection space.