Hollow Ferrite Cube Transmitter for Shielded 3D Magnetic Positioning

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Solution Overview

Problem

Existing magnetic transmitter systems for determining spatial position face challenges in generating strong magnetic fields over large distances while maintaining precise position measurements, requiring separate shielding for sensitive electronics which can distort the magnetic field.

Innovation Solution

A magnetic shielded transmitter system utilizing a hollow ferrite cube with external copper windings and internal control circuitry to generate a unified X, Y, Z magnetic field, reducing the need for multiple boxes and minimizing magnetic interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If a bigger transmitter coil is used to increase transmission distance, then the magnetic field range is improved, but the device size and power consumption increase

Engineering Contradiction:

Improvetransmission distanceVSAvoidpower consumption

Core Design Contradiction:

Length of stationary objectVSPower

Solution Approach 1:

The driver circuitry is nested inside the hollow interior of the ferrite cube, allowing the electronics to be positioned close to the transmitter windings without requiring external shielding boxes. This integration eliminates the need for separate shielded enclosures and reduces overall system complexity while maintaining efficient magnetic field generation at extended distances

Inventive Principle:

Principle #7Nested doll (Nesting)

2Object-affected harmful factors

If shielding is added to protect sensitive electronics from magnetic field interference, then electronic protection is improved, but magnetic field distortion occurs

Engineering Contradiction:

Improveelectronic protectionVSAvoidposition measurement accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The harmful magnetic field is extracted from the interior region by using the ferrite cube's inherent shielding properties, allowing the driver circuitry to be placed inside without additional external shielding. The ferrite material confines the magnetic field within its structure, protecting the electronics while avoiding field distortion that would occur with traditional metallic shielding boxes

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The ferrite cube acts as an intermediary structure that simultaneously provides magnetic shielding for the electronics and maintains magnetic field integrity for position measurements. The ferrite material's magnetic properties allow it to guide and contain the field without the distortion caused by conventional metallic shields

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If driver circuitry is placed close to the transmitter to reduce system complexity, then device integration is improved, but the electronics are exposed to strong magnetic fields

Engineering Contradiction:

Improvesystem integrationVSAvoidmagnetic field exposure

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #7Nested doll (Nesting)

4Power

If higher power is used to generate strong magnetic fields, then field strength is improved, but energy loss and heat generation increase

Engineering Contradiction:

Improvefield strengthVSAvoidenergy loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The system uses a composite structure combining ferrite cube with copper windings. The ferrite material's high magnetic permeability concentrates and guides the magnetic field, allowing stronger fields to be generated with lower power input. This composite approach reduces energy loss and heat generation compared to using air-core coils alone

Inventive Principle:

Principle #40Composite materials

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 approach enhances field strength efficiency and allows placement of sensitive electronics within the shielded structure, maintaining precise position measurements with reduced magnetic interference and heat loss.

Implementation Method 1

a quadratic ferrite cube... used as a shielded room for a control and driving circuitry by generating the X, Y Z magnetic field

Methodology Applied

Scientific EffectMagnetic shielding: Magnetism

Implementation Method 2

a plurality of copper windings placed on an external portion of the quadratic ferrite cube... used to generate a X, Y, Z magnetic field

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20250218635A1Methods and systems for magnetic shielded transmitter system

Publication Date: 2025.07.03 JENSEN JOERGEN SELMER

AI summary

In one aspect, a quadratic ferrite cube, wherein the quadratic ferrite cube comprises a hollow interior portion, wherein quadratic ferrite cube comprises a geometric shape that exhibits a same magnetic performance in an X direction, a Y direction, and a Z direction; a plurality of copper windings placed on an external portion of the quadratic ferrite cube; and a control and driving circuitry located inside the hollow interior portion, wherein the quadratic ferrite cube is used to generate a X, Y, Z magnetic field, and wherein the quadratic ferrite cube is used as a shielded room for a control and driving circuitry by generating the X, Y Z magnetic field in a range 20 KHz to 50 KHz for a magnetic based position system.