Oscillating Coil Induction Generator for Low-Noise Energy Conversion

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Solution Overview

Problem

Existing induction generators face inefficiencies due to the need to move a heavy magnet system and the requirement for complete magnetic polarity reversal, leading to mechanical losses and unwanted resonance oscillations, which reduce energy conversion efficiency and increase noise.

Innovation Solution

The induction generator design moves the coil instead of the magnet system, ensuring maximum exposure to the magnetic field, and eliminates the need for complete polarity reversal, using a spring element to cause oscillating movement of the coil within an annular air duct, thereby reducing resistance losses and mechanical stress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the magnet system is moved for energy conversion, then electrical energy can be generated, but the heavy mass requires significant force and causes mechanical losses

Engineering Contradiction:
Improveenergy conversion capabilityVSAvoidmass of magnet system
Core Design Contradiction:
PowerVSWeight of moving object

Solution Approach 1:

The patent inverts the conventional approach by moving the coil instead of the magnet system. The coil assembly with permanent magnets is moved relative to the stationary coil windings, reversing the traditional roles of moving and stationary components. This inversion reduces the mass of the moving part while maintaining electromagnetic induction functionality.

Inventive Principle:
Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the mechanical movement of heavy magnet systems with an oscillating coil assembly driven by minimal mechanical input. The spring element provides the necessary oscillation without requiring heavy mechanical actuators, substituting complex mechanical drive systems with a simple elastic oscillation mechanism.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Power

If complete magnetic polarity reversal is implemented, then electrical energy generation is achieved, but mechanical losses and resonance oscillations increase

Engineering Contradiction:
Improveelectrical energy generationVSAvoidmechanical losses
Core Design Contradiction:
PowerVSLoss of energy

Solution Approach 1:

The patent implements partial magnetic polarity reversal by oscillating the coil assembly through a limited angular range rather than completing full 360-degree rotations. The spring element naturally limits the oscillation amplitude, achieving sufficient electromagnetic induction without the excessive mechanical action required for complete polarity reversal in conventional systems.

Inventive Principle:
Principle #16Partial or excessive action

Solution Approach 2:

The patent employs periodic oscillation of the coil assembly driven by the spring element. This periodic motion continuously reverses magnetic polarity through repeated oscillations rather than single complete reversals, maintaining energy generation while reducing mechanical stress and resonance issues associated with abrupt complete reversals.

Inventive Principle:
Principle #19Periodic action

3Loss of energy

If the coil is moved to reduce the mass of moving parts, then mechanical losses are reduced, but ensuring maximum magnetic field exposure becomes more complex

Engineering Contradiction:
Improvemechanical lossesVSAvoidmagnetic field exposure configuration
Core Design Contradiction:
Loss of energyVSDevice complexity

Solution Approach 1:

The patent nests the permanent magnets within the coil assembly, with the magnets positioned inside the stationary coil windings. This nested configuration ensures that the moving permanent magnets are always surrounded by the stationary coils, maximizing magnetic field exposure throughout the oscillation range without requiring complex external magnetic circuit arrangements.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent transitions from linear or radial magnetic field configurations to a three-dimensional nested arrangement where permanent magnets oscillate within the volume enclosed by stationary coils. This spatial arrangement in multiple dimensions ensures comprehensive magnetic field exposure during oscillation while maintaining a compact structure.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

4Volume of moving object

If a flat design is implemented for wall switches, then installation space is reduced, but mechanical deflection of force introduction becomes necessary

Engineering Contradiction:
Improveinstallation spaceVSAvoidmechanical deflection mechanism
Core Design Contradiction:
Volume of moving objectVSDevice complexity

Solution Approach 1:

The spring element serves multiple functions simultaneously: it acts as the oscillation drive mechanism, provides mechanical deflection for force introduction, and serves as part of the magnetic circuit. This multi-functionality eliminates the need for separate mechanical deflection components, maintaining the flat design while achieving the necessary mechanical action.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the oscillation drive mechanism with the force introduction mechanism by using the spring element to directly couple user input with coil oscillation. This combination integrates multiple mechanical functions into a single element, reducing overall device complexity while maintaining the compact flat form factor required for wall switch applications.

Inventive Principle:
Principle #5Merging (Combining)

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 design enhances energy conversion efficiency, reduces noise, extends the generator's lifespan, and eliminates the need for complex gearing, resulting in a compact, high-efficiency electromechanical energy converter suitable for autonomous radio systems.

Implementation Method 1

the spring element is designed to cause an oscillating movement of the coil in the air duct transverse to a magnetic flux of the permanent magnetic field within the air duct in response to a deflection of the coil

Methodology Applied
Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP2939334B1Induction generator and method for generating an electric current using an induction generator
Publication Date: 2021.04.28 ZF FRIEDRICHSHAFEN AG
  • EP2939334B1 patent drawingFigure 1
  • EP2939334B1 patent drawingFigure 2A~2B
  • EP2939334B1 patent drawingFigure 2C~2D

AI summary

The invention proposes an induction generator (200; 301) having a magnet arrangement (204; 304) for generating a permanent magnetic field, an annular coil (206; 306), a spring element (228; 328) and an air channel (212; 312) penetrated by the permanent magnetic field, wherein said magnet arrangement (204; 304) comprises a first pole section (208; 308), a section pole section (210; 310) and a magnet (214; 314) arranged between said first pole section (208; 308) and said second pole section (210; 310), said coil (206; 306) being connected to said spring element (228; 328) and being arranged in said air channel (212; 312) in such a way that it can move, and the spring element (228; 328) being designed to bring about an oscillation movement (224) of the coil (206; 306) in the air channel (212; 312) transversely to a magnetic flux (222; 322) of the permanent magnetic field within the air channel (212; 312) in response to displacement of the coil (206; 306), characterized in that the air channel (212; 312) has an annular shape and is designed to fully accommodate the annular coil (206; 306).