Induction Heating Plate Asymmetric Magnetic Field

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Solution Overview

Problem

Existing hair styling devices with resistive heating assemblies take a long time to heat up and cool down, which can frustrate users and pose safety issues.

Innovation Solution

A hair styling device equipped with an induction heating assembly that generates a varying, asymmetric magnetic field to rapidly heat the induction heating plate and allow for faster cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If resistive heating assemblies are used, then the heating plate can be heated, but it takes a relatively long time to heat up and cool down

Engineering Contradiction:

Improveheating speedVSAvoidheating time

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent replaces the resistive heating system with an induction heating system. The induction heating assembly uses electromagnetic fields to directly induce eddy currents in the heating plate, which generates heat through Joule heating. This substitution of the heating mechanism dramatically reduces heating time while also enabling faster cooling when the magnetic field is turned off, as there is no residual heat generation from resistive elements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs an asymmetric magnetic field configuration where the magnetic field strength at the top side of the induction heating assembly is substantially greater than at the bottom side. This parameter change in magnetic field distribution optimizes heating efficiency by concentrating the electromagnetic energy where it is most needed (at the heating plate interface) while minimizing energy loss and reducing overall heating time.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If resistive heating assemblies are used, then the heating plate can be heated, but it takes a relatively long time to cool down which poses safety issues

Engineering Contradiction:

ImprovesafetyVSAvoidcooling time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The induction heating system replaces resistive heating, allowing for instantaneous control of heat generation. When the alternating magnetic field is turned off, the induction heating assembly stops generating heat immediately, and the heating plate begins to cool down rapidly through conduction and convection without continuous heat input. This provides superior safety control compared to resistive systems that may have thermal inertia.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The induction heating assembly uses periodic alternating magnetic fields to generate heat. By controlling the frequency and duration of these periodic cycles, the system can rapidly switch between heating and cooling states, providing precise thermal control and rapid cooling capability for safety.

Inventive Principle:

Principle #19Periodic action

3Use of energy by moving object

If a symmetric magnetic field is used in induction heating, then heating can be achieved, but magnetic energy is lost in directions away from the heating plate

Engineering Contradiction:

Improveenergy efficiencyVSAvoidmagnetic energy loss

Core Design Contradiction:

Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The patent employs an asymmetric magnetic field configuration in the induction heating assembly where the magnetic field strength at the top side (facing the heating plate) is substantially greater than at the bottom side. This asymmetry directs the majority of magnetic flux toward the heating plate, minimizing magnetic energy loss in other directions and improving overall energy efficiency. The asymmetric design ensures that magnetic energy is concentrated where it is needed for heating rather than radiating in all directions.

Inventive Principle:

Principle #4Asymmetry

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 induction heating assembly enables rapid heating and cooling of the hair styling device, improving user experience and safety by reducing the time to reach operating temperature and ensuring quicker shutdown when not in use.

Implementation Method 1

induction heating is a process whereby an electrically conducting object is heated by electromagnetic induction in which a varying/alternating magnetic field is produced. The magnetic field penetrates the electrically conductive object, in this case an induction heating plate, and induces eddy currents within the object

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

induces eddy currents within the object. These eddy currents flow through the object and heat the object via Joule heating

Methodology Applied

Scientific EffectEddy currents: Eddy Currents

Implementation Method 3

These eddy currents flow through the object and heat the object via Joule heating

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 4

the varying magnetic field being asymmetric such that the magnetic field strength at the top side is substantially greater than the magnetic field strength at the bottom side

Methodology Applied

Scientific EffectAsymmetric magnetic field: Magnetic Field

Data Source

PatentUS20250134227A1Hair styling device

Publication Date: 2025.05.01 DYSON TECH LTD

AI summary

A hair styling device for heating hair is provided. The device comprises an induction heating plate arranged to be heated by penetration with a varying magnetic field and an induction heating assembly configured to generate the varying magnetic field.