Split Tubular Ferrite Core Composition for Stable Noise Filtering
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Solution Overview
Problem
Conventional noise filters using a tubular ferrite core with divided core portions have a reduced noise-removing effect compared to those with undivided cylindrical ferrite cores, due to insufficient contact pressure between the divided end surfaces.
Innovation Solution
A noise filter with a tubular ferrite core having two divided core portions, each containing 0.5% to 2.0% platinum group metal, such as rhodium, which are molded and sintered to enhance hardness and ensure sufficient contact when pressed together, forming a tubular shape with a cylindrical hollow portion and elongated grooves for improved noise absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a tubular ferrite core is divided into two core portions for easier mounting on cables, then the ease of operation is improved, but the noise-removing effect deteriorates due to insufficient contact pressure between divided end surfaces
Solution Approach 1:
The patent changes the material composition parameter by adding platinum group metal (0.01-5 wt%, preferably 0.1-2 wt%) to the ferrite powder mixture. This parameter change increases the hardness of the ferrite core material, enabling the divided end surfaces to maintain sufficient contact pressure when mounted on cables, thereby resolving the contradiction between ease of mounting and noise-removing effect
Solution Approach 2:
The patent creates a composite ferrite material by combining ferrite powder with platinum group metal particles. This composite structure provides both the magnetic properties needed for noise removal and the enhanced hardness required for sufficient contact pressure at the divided interfaces, thus maintaining effectiveness while enabling divided construction for easier installation
2Adaptability or versatility
If a tubular ferrite core is used instead of an undivided cylindrical core for post-installation mounting, then the adaptability is improved, but the noise-removing effect deteriorates
Solution Approach 1:
By modifying the material composition to include platinum group metal, the patent enhances the hardness parameter of the ferrite core. This allows the divided core portions to maintain sufficient contact pressure at their interfaces, ensuring that the noise-removing effect is preserved even when the core is divided for post-installation mounting purposes
Solution Approach 2:
The composite ferrite material containing platinum group metal provides both the structural integrity needed for divided construction and the magnetic properties required for effective noise removal, enabling the core to maintain performance while offering mounting flexibility
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 noise filter achieves noise reduction and power consumption savings comparable to or exceeding those of undivided tubular ferrite core filters, with improved heat dissipation and stability, demonstrated by power consumption reductions in experiments on escalators and freezers.
Implementation Method 1
a noise filter that absorbs electromagnetic waves and removes noise by using a ferrite core
Implementation Method 2
the ferrite core is formed in a tubular shape and is divided into two divided core portions
Implementation Method 3
The two divided core portions include a platinum group metal in an amount of 0.5% to 2.0% with respect to the total weight of a ferrite powder
Implementation Method 4
a sintering step for sintering the molded divided core portions
Data Source
AI summary
A noise filter that is capable of efficiently removing noise even in a case where a ferrite core having two divided core portions is used. The noise filter includes a tubular ferrite core. The ferrite core includes two divided core portions. The two divided core portions are configured to be divided along divided end surfaces in an axial direction of the ferrite core. The two divided core portions include a platinum group metal in an amount of 0.5% to 2.0% with respect to the total weight of a ferrite powder.