Permanent Magnet DC Inductor With Intermediary Magnetic Gaps
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Solution Overview
Problem
Existing DC inductors with permanent magnets face issues such as demagnetization due to high currents, mechanical fragility, and difficulty in modifying inductance, as well as high coupling coefficients between windings, leading to size and mass inefficiencies.
Innovation Solution
The design features two separate inductors with permanent magnets placed between them, forming an integral magnetic path that opposes coil magnetization, reducing the number of magnets needed and providing mechanical protection, while allowing for easy modification of inductance by adjusting magnetic gaps and magnet dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If permanent magnets are placed inside the core structure or attached to the outer surface, then the cross-sectional area of the inductor core is minimized, but the permanent magnets become mechanically fragile and vulnerable to mechanical impacts
Solution Approach 1:
The patent introduces an intermediary component (holder or support structure) that physically separates the permanent magnets from the core structure. This intermediary provides mechanical protection to the fragile permanent magnets while maintaining their magnetic function, resolving the contradiction between minimizing core area and protecting magnets from mechanical damage.
2Volume of stationary object
If permanent magnets are integrated into the core structure, then the inductor design is compact, but the inductance cannot be easily modified and the structure becomes complicated
Solution Approach 1:
The patent segments the inductor into distinct modular components: the core structure, the windings, and the permanent magnets. This segmentation allows the permanent magnets to be independently adjusted or replaced without modifying the entire core structure, enabling easy modification of inductance while maintaining a compact design.
Solution Approach 2:
The patent introduces adjustability into the previously static core structure by allowing the permanent magnets to be positioned at different locations or removed entirely. This dynamic configuration enables the inductance to be modified based on application requirements while keeping the overall inductor volume compact.
3Weight of stationary object
If a single core inductor with two windings is used, then the size and mass are reduced, but the coupling coefficient between windings becomes very high causing abnormal phenomena to reflect between DC bus bars
Solution Approach 1:
The patent applies local quality by introducing permanent magnets at specific locations within the core structure to create localized magnetic field modifications. This allows different regions of the inductor to have different magnetic characteristics, enabling reduced coupling between windings while maintaining the compact single-core design and low mass.
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 configuration enhances mechanical protection, reduces demagnetization risks, and allows for smaller, more efficient inductor designs with adjustable inductance, minimizing magnetic coupling and flux density, thus optimizing space and performance.
Implementation Method 1
The permanent magnets can be arranged in the core structure in such a way that a magnetic flux or the magnetization produced by the permanent magnets is opposite to that obtainable from the coil wound on the core structure
Implementation Method 2
The use of permanent magnets in the DC inductors can allow for minimizing a cross-sectional area of the inductor core
Data Source
AI summary
A permanent magnet DC inductor is disclosed which includes at least two separate and individual magnetic inductors, each having its own core structure and forming closed individual magnetic paths having at least one magnetic gap. Windings are provided on the magnetic cores, and at least one permanent magnet piece is provided with each inductor. The separate magnetic cores having the at least one magnetic gap are arranged against each other to form external magnetic gaps with the permanent magnet pieces arranged inside the external magnetic gaps on both sides of the at least one magnetic gap.