Electromagnetic Flux Valve Embedded Coil Design
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Solution Overview
Problem
Existing solutions for controlling passive Rare Earth Magnet flux in magnetic power converters are limited by inductive reactance, which restricts the frequency of the input drive signal and requires excessive reactive power.
Innovation Solution
The Electro-Magnetic Flux Valve (EMFV) employs a ferromagnetic core with voids to allow a flux control coil to moderate the magnetic field, creating two flux control elements that provide linear flux control and utilize an isolated boost circuit to recover reactive power, enabling efficient flux control and energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external coil is used to control the flux density through the core material, then the flux control function is achieved, but the inductive reactance limits the frequency of the input drive signal and increases reactive power requirement
Solution Approach 1:
The patent extracts the flux control function from a conventional external coil configuration and relocates it to an embedded coil positioned within a dedicated void in the ferromagnetic core. This extraction allows the coil to be positioned optimally within the magnetic circuit, reducing the magnetic path length and inductance, thereby decreasing reactive power requirements while maintaining effective flux control capability
Solution Approach 2:
The patent implements nesting by placing the flux control coil inside a void within the ferromagnetic core structure. The coil is nested within the core assembly rather than being external, allowing direct coupling with the magnetic flux paths. This nested configuration reduces the coil's exposure to external magnetic fields and minimizes parasitic inductance, enabling higher frequency operation with reduced reactive power
2Adaptability or versatility
If an external coil is used to control the flux density, then flux modulation is possible, but the frequency of the input drive signal is limited by inductive reactance
Solution Approach 1:
The patent replaces the conventional external coil electromagnetic system with an optimized embedded coil configuration integrated within the ferromagnetic core. This substitution creates a more efficient electromagnetic coupling system with lower inductance and resistance, enabling the system to operate at higher frequencies while maintaining full flux modulation capability through the embedded coil's control winding
3Use of energy by moving object
If a ferromagnetic core with voids and embedded coil is used, then linear flux control with minimal energy input is achieved, but the device structure becomes more complex
Solution Approach 1:
The patent segments the ferromagnetic core by introducing a controlled void within its structure to accommodate the flux control coil. This segmentation creates distinct functional zones: the embedded coil winding region, the magnetic flux paths through the core, and the return paths. While this increases structural complexity, it enables the coil to operate with minimal inductance and allows precise local flux control with very low energy input requirements
Solution Approach 2:
The patent applies local quality by creating a specific void region within the ferromagnetic core where the coil is embedded. This localized modification provides optimal magnetic coupling between the coil and the flux paths it needs to control, while the rest of the core maintains its standard ferromagnetic properties. The local void structure enables efficient energy transfer with minimal input power
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 EMFV effectively controls magnetic flux density with minimal energy input, overcoming inductive reactance limitations and achieving efficient energy recovery, thereby enhancing the performance of magnetic power converters.
Implementation Method 1
The flux control coil 16 produces a local magnetic field which circulates around each void 12 and 15 independently and moderates the local flux density around each void
Implementation Method 2
The ferromagnetic core 14 acting as a shunt to the magnetic flux field of the magnet 13
Implementation Method 3
the outer flux path 17 will saturate while the inner flux path 18 will provide a linear flux control proportional to the H field applied
Data Source
AI summary
The Electro-Magnetic Flux Valve (EMFV) is an electrically actuated permanent magnet field flux shunt comprised of a low reluctance ferromagnetic core, surrounding a permanent magnet, with at least two imbedded control element sections by which the permeance of the core can be reduced. When placed within an external closed magnetic circuit, the EMFV core, at quiescence, acts as a keeper to the magnetic flux of the magnet. When electrically activated, the EMFV core permeance is reduced and the permanent magnet flux is released to energize the external magnetic circuit. When the control signal is removed the EMFV core again becomes highly permeable and constrains the permanent magnet flux thus deenergizing the external magnetic circuit. The EMFV is intended to be an integral part of a Magnetic Power Converter.