Particle Coating Device Using Multi-Roller Centrifugal Classification
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Solution Overview
Problem
Existing particle coating methods for magnetic powders face challenges in achieving uniform film thickness across particles of varying diameters, leading to potential gaps in insulation and reduced magnetic powder characteristics due to larger particles obscuring smaller ones during coating.
Innovation Solution
A particle coating device with multiple magnet rollers and a controlled rotation system ensures that particles of different diameters are fixed at specific positions, allowing for uniform coating by using a product of rotation radius and speed to separate and classify particles based on size, thereby ensuring consistent film thickness across all particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If particles are coated by sputtering in a bottomed cylindrical container with rotation, then coating is applied to particle surfaces, but particles with small diameters are hidden behind particles with large diameters resulting in non-uniform film thickness
Solution Approach 1:
The patent divides the particle coating process into multiple stages using multiple magnet rollers positioned at different heights. Each magnet roller handles a specific size range of particles, separating them from the mixture. This segmentation allows small particles to be coated independently without being hidden by large particles, achieving uniform film thickness while using a structured multi-component device.
2Manufacturing precision
If multiple magnet rollers with different rotation speeds are used to classify particles by size, then uniform coating is achieved across particles of varying diameters, but the device complexity increases
Solution Approach 1:
The patent employs multiple magnet rollers that rotate at dynamically adjusted speeds to classify particles by size. Each roller's rotation speed is optimized to create appropriate centrifugal forces for its specific particle size range. This dynamic approach enables precise particle separation and uniform coating, with the control system managing the complexity through coordinated rotation of multiple components.
3Manufacturing precision
If particles are fixed at specific positions on magnet rollers, then coating uniformity is improved, but the insulation property may be compromised if small particles remain hidden
Solution Approach 1:
The patent adds a vertical dimension to particle classification by positioning magnet rollers at different heights within the container. This spatial arrangement in multiple dimensions allows small particles to be captured and coated on lower rollers while large particles are handled by upper rollers, eliminating the hiding problem and ensuring both coating uniformity and reliable insulation properties.
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 solution effectively reduces variations in film thickness and enhances the insulation properties of magnetic powders by ensuring that all particles receive a uniform coating, improving the overall magnetic characteristics and preventing larger particles from obscuring smaller ones during the coating process.
Implementation Method 1
a first magnet roller that is provided inside the container, is coupled with the first rotation introducer, and generates a magnetic field
Implementation Method 2
A product r1ω12 of a rotation radius r1 and a square of a rotation speed ω1 per unit time of the first magnet roller is larger than a product r2ω22 of a rotation radius r2 and a square of a rotation speed ω2 per unit time of the second magnet roller
Data Source
AI summary
A particle coating device includes a container having a powder supply port that supplies a powder, a first rotation introducer provided below the powder supply port, a second rotation introducer provided below the first rotation introducer, a first magnet roller coupled with the first rotation introducer, a second magnet roller coupled with the second rotation introducer, a first drive unit that rotates the first magnet roller, a second drive unit that rotates the second magnet roller, a control unit that controls an operation of the first drive unit and an operation of the second drive unit, and a film forming unit that supplies a coating material for coating particles in the powder into the container. A product r1ω12 of a rotation radius r1 and a square of a rotation speed ω1 per unit time of the first magnet roller is larger than a product r2ω22 of a rotation radius r2 and a square of a rotation speed ω2 per unit time of the second magnet roller.