Self-Centering Ferrite Inductor Assembly for Low Eddy Current Loss
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Solution Overview
Problem
Conventional inductors used in Class-D audio amplifiers suffer from negative performance parameters such as heating and power loss due to eddy currents caused by inconsistent wire core assembly, leading to suboptimal performance in demodulation filters.
Innovation Solution
The design features ferrite core pieces with self-locating and self-centering wire core assemblies, made from flat magnet wire with spring-like characteristics, to minimize eddy currents and maintain uniform magnetic characteristics, reducing power loss and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional wire core assembly is used in inductor, then manufacturing is simpler, but eddy currents increase causing heating and power loss
Solution Approach 1:
The patent changes the geometric parameters of the wire core assembly by introducing spiral grooves that create an expanded cross-sectional shape. This parameter change increases the distance between adjacent wire turns, thereby reducing eddy current paths and minimizing power loss while maintaining manufacturability through standard molding processes
Solution Approach 2:
The patent uses composite construction by combining the wire core assembly with ferrite core pieces. The wire core assembly itself is composed of multiple wire strands arranged in a specific spiral groove pattern, creating a composite structure that reduces eddy currents while maintaining mechanical integrity and ease of manufacture
2Stability of the object's composition
If inconsistent wire core assembly is used, then device complexity is reduced, but magnetic characteristics become non-uniform
Solution Approach 1:
The patent introduces spiral grooves with curved geometry in the wire core assembly. This curved/spheroidal design creates a more uniform magnetic field distribution by eliminating sharp corners and inconsistent air gaps, ensuring stable magnetic characteristics while the spiral groove pattern itself provides the necessary structural definition
Solution Approach 2:
The patent applies local quality changes by creating specific spiral groove patterns in certain regions of the wire core assembly. These localized structural modifications ensure uniform magnetic characteristics in critical areas while maintaining overall structural simplicity and ease of manufacture
3Loss of energy
If flat magnet wire with spring-like characteristics is used, then eddy currents are minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses flat magnet wire with spring-like characteristics that provides dynamic flexibility. The wire can be elastically deformed during assembly to fit into the spiral groove pattern, and the spring-like properties allow for self-adjustment to achieve consistent positioning, thereby reducing manufacturing precision requirements while maintaining the eddy current reduction benefits
Solution Approach 2:
The patent employs flat magnet wire that functions as a flexible element. The thin, flat geometry combined with spring-like properties allows the wire to conform to the spiral groove structure, ensuring consistent assembly and uniform magnetic characteristics without requiring extremely tight manufacturing tolerances
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 solution effectively minimizes eddy current losses and power dissipation, improving the overall efficiency and performance of Class-D audio amplifiers by ensuring a uniform and stable magnetic environment within the inductor.
Implementation Method 1
Conventional inductors used in Class-D audio amplifiers suffer from negative performance parameters such as heating and power loss due to eddy currents caused by inconsistent wire core assembly
Implementation Method 2
The design features ferrite core pieces with self-locating and self-centering wire core assemblies, made from flat magnet wire with spring-like characteristics, to minimize eddy currents and maintain uniform magnetic characteristics
Data Source
AI summary
An inductor is provided, comprising: a first ferrite core piece and a second ferrite core piece, each of which are made of substantially similar materials, exhibit desired electromagnetic properties, and which are fashioned in a substantially similar manner and shape, and wherein each of the first and second ferrite core pieces comprises a substantially planar mating surface, a center post, and a wire core assembly channel, and wherein a first substantially planar mating surface of the first ferrite core piece is adapted to planarly mate with a second substantially planar mating surface of the second ferrite core piece; and a wire core assembly adapted to be substantially self-locating and self-centering about a first or second center post when located in a respective first or second wire core assembly channel.