Anisotropic Permanent Magnet Flakes for Field-Free Orientation Control
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Solution Overview
Problem
Existing methods for producing anisotropic permanent magnets are limited in flexibility regarding shape and magnetization direction control, making it challenging to achieve improved performance and efficiency in magnetic devices, especially for complex shapes.
Innovation Solution
A method involving the formation of anisotropic flakes from bulk magnet alloys with easy magnetization directions, combined with a binder, and processed through extrusion or rolling without a magnetic field to align the flakes, allowing for the creation of magnets with specific magnetization orientations and complex shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional consolidation steps are used to prepare anisotropic magnets, then the magnetic grains can be aligned in a magnetic field, but the shape of the magnets is limited to cylinders, cubes, and other regular shapes with fixed orientations
Solution Approach 1:
The invention divides the magnet into thin flakes or plates with thickness less than 10 micrometers. These segmented flakes can be independently oriented and assembled, enabling complex 3D magnetization patterns that would be impossible with conventional monolithic shapes. The segmentation allows each flake to maintain its magnetic alignment while the overall structure achieves geometric flexibility.
Solution Approach 2:
The invention transitions from conventional 3D bulk magnets to thin 2D flake structures. By reducing the thickness dimension to less than 10 micrometers, the flakes can be stacked and arranged in complex configurations, enabling arbitrary 3D magnetization patterns and complex external shapes while maintaining magnetic grain alignment within each flake plane.
2Shape
If additive manufacturing and new processing techniques are used to produce complex shapes, then shape flexibility is improved, but flexibility in controlling the magnetization direction is still challenging
Solution Approach 1:
The invention performs preliminary magnetic field alignment on the magnetic grains within each thin flake before the flakes are assembled into the final complex structure. This preliminary action ensures that each flake has its magnetization direction established and locked in place, making the overall magnetization control straightforward even when the final assembled shape is complex and irregular.
Solution Approach 2:
The invention allows different regions of the magnet to have different magnetization directions by orienting individual flakes or groups of flakes differently during assembly. Each local region can be optimized for its specific function, enabling complex 3D magnetization patterns where different parts of the magnet have different magnetic properties tailored to local requirements.
3Stability of the object's composition
If magnetic fields are applied during conventional processing, then magnetic grain alignment is achieved, but the process complexity and equipment requirements increase
Solution Approach 1:
The invention uses temporary, low-cost alignment methods such as mechanical shearing, rolling, or simple magnetic fields applied only during the flake formation stage. These temporary alignment actions are sufficient to establish the magnetic grain orientation in each flake, eliminating the need for complex, expensive, and continuous magnetic field equipment throughout the entire manufacturing process.
Solution Approach 2:
The invention replaces complex magnetic field-based alignment systems with simpler mechanical alignment methods. By using mechanical processes such as shearing, rolling, or vibration during flake formation, the magnetic grains are aligned through mechanical forces rather than requiring sophisticated magnetic field generation and control equipment, thereby reducing device complexity.
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 the production of anisotropic permanent magnets with controlled magnetization directions and complex shapes, enhancing magnetic field performance and flexibility in device design without the need for a magnetic field during processing.
Implementation Method 1
each of the anisotropic flakes having an easy magnetization direction with respect to a surface of the flake
Data Source
AI summary
A method of processing an anisotropic permanent magnet includes forming anisotropic flakes from a bulk magnet alloy, each of the anisotropic flakes having an easy magnetization direction with respect to a surface of the flake and combining the anisotropic flakes with a binder to form a mixture. The method further includes extruding or rolling the mixture without applying a magnetic field such that the easy magnetization directions of the anisotropic flakes align to form one or more layers having a magnetization direction aligned with the easy magnetization directions of the anisotropic flakes, and producing the anisotropic permanent magnet from the layers having the magnetization direction such that the anisotropic permanent magnet has a magnetization with a specific orientation.