Variable Magnetic Coupling Transformer Without a Heavy Core

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Solution Overview

Problem

Existing magnetic coupling devices for electrical circuits require large magnetic cores, leading to bulkiness and suboptimal performance, and struggle with efficient voltage transformation with variable gains, especially in applications like electric cars and renewable energy systems.

Innovation Solution

A magnetic coupling device with first and second coils arranged along a closed curved line, where the second coils can move between positions of maximum and minimum magnetic coupling, allowing for variable transformation gain without a magnetic core, and incorporating a support guide and actuator for controlled movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a large magnetic core is used in magnetic coupling devices, then magnetic field control is improved, but device size and weight increase significantly

Engineering Contradiction:

Improvemagnetic field controlVSAvoiddevice weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent removes the magnetic core entirely from the magnetic coupling device, replacing it with a system of coils arranged along a closed curved line. This extraction eliminates the heavy magnetic core while maintaining magnetic coupling functionality through the coil arrangement and movable second coil mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical magnetic core structure with an electromagnetic field-based system using coils. The magnetic coupling is achieved through the interaction between first and second coils rather than through a physical magnetic core, substituting a mechanical structure with an electromagnetic field-based solution.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If magnetic coupling devices are designed for variable voltage gain, then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improvevoltage gain variabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements variable voltage gain through the movable second coil that can change its position relative to the first coils. This dynamic adjustment of coil position alters the magnetic coupling strength, enabling variable transformation ratio without complex electronic control circuits or multiple discrete components.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent achieves variable voltage gain by changing the physical parameter of coil position rather than changing electrical parameters through complex circuits. The transformation ratio is controlled by the spatial parameter (position of second coil) rather than through complex electrical control mechanisms.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If intermediate coils are added to magnetic coupling devices, then coupling efficiency is improved, but device size and manufacturing complexity increase

Engineering Contradiction:

Improvecoupling efficiencyVSAvoidmanufacturing simplicity

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The patent segments the magnetic coupling function into first coils and movable second coils arranged along a closed curved line, eliminating the need for a single large intermediate coil or magnetic core. This segmentation distributes the coupling function across multiple smaller coil elements that are easier to manufacture and assemble.

Inventive Principle:

Principle #1Segmentation

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 enables efficient energy transfer with reduced bulk, optimal performance, and adjustable transformation gain, suitable for high current applications and variable voltage requirements.

Implementation Method 1

at least one second coil is mounted movable relative to at least one of the first two successive coils it separates, between a first position in which the at least one second coil has maximum magnetic coupling with said at least one of the first two successive coils it separates and a second position in which the at least one second coil has minimum magnetic coupling

Methodology Applied

Scientific EffectMagnetic coupling: Electromagnetic Induction

Data Source

PatentEP4339975A1Magnetic coupling device with variable coupling and transformer circuit comprising such a device

Publication Date: 2024.03.20 EFFITECH (PVT) LTD

Figure 1A~1B
Figure 2A~2B
Figure 3~4

AI summary

The invention relates to a magnetic coupling device (10) comprising: a first set (11) of first coils having a winding axis; a second set (12) of second coils (12A, 12B, 12C...) having a winding axis. The first and second coils (11A, 11B, 11C..., 12A, 12B, 12C...) are distributed along a closed curved line with their winding axes extending along bisectors of said closed curved line. At least one second coil (12A, 12B, 12C...) is arranged movable relative to at least one of the first two successive coils (11A, 11B, 11C...) which it separates between a first position in which it presents a maximum magnetic coupling and a second position in which it presents a minimum magnetic coupling with respect to a first coil (11A, 11B, 11C).