Magnetic field application device

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Solution Overview

Problem

Existing magnetic field application devices require significant current to apply a magnetic field to a magnetic working substance when the coil is energized, leading to inefficiencies and increased copper loss, and they often rely on the coil being energized to generate a magnetic field, limiting the magnetic field application when the coil is non-energized.

Innovation Solution

A magnetic field application device comprising a magnetic field application unit with a permanent magnet, a yoke forming closed magnetic circuits, and a coil that changes the magnetic field intensity, where the magnetic flux of the permanent magnet is branched to flow through the closed magnetic circuits even when the coil is non-energized, allowing for magnetic field application to the magnetic working substance without energizing the coil.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the coil is energized to apply a magnetic field to the magnetic working substance, then the magnetic field intensity can be controlled, but significant current is required leading to increased copper loss and energy inefficiency

Engineering Contradiction:

Improvemagnetic field application capabilityVSAvoidcopper loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The permanent magnet is pre-configured to provide a baseline magnetic field through the closed magnetic circuits formed by the yoke, eliminating the need to energize the coil for basic magnetic field application. The coil only needs to be energized when magnetic field intensity adjustment is required, significantly reducing overall energy consumption and copper loss.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The permanent magnet serves itself by continuously generating magnetic flux that flows through the closed magnetic circuits without requiring external energy input. The yoke structure automatically guides and branches this flux through multiple paths, providing sustained magnetic field application without continuous electrical power consumption.

Inventive Principle:

Principle #25Self-service

2Loss of energy

If the coil is non-energized to reduce energy consumption, then copper loss decreases, but the magnetic field application capability is limited

Engineering Contradiction:

Improvecopper lossVSAvoidmagnetic field intensity

Core Design Contradiction:

Loss of energyVSPower

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If a single closed magnetic circuit is used, then the structure is simple, but the magnetic flux distribution is limited and less efficient

Engineering Contradiction:

Improvemagnetic circuit structureVSAvoidmagnetic flux efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The closed magnetic circuit is segmented into multiple parallel paths through the yoke structure, allowing magnetic flux to be distributed across several circuits. This segmentation increases the total effective magnetic flux reaching the working substance while maintaining a relatively simple overall structure, improving magnetic flux efficiency without excessive complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple closed magnetic circuits are merged into a unified yoke structure that shares common components. The yoke integrates several magnetic paths that work together to distribute and enhance the magnetic flux from the permanent magnet, achieving improved flux efficiency through combined action while avoiding the complexity of completely separate circuits.

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 configuration reduces the current required to achieve the desired magnetic flux density in the magnetic working substance, decreases copper loss, and allows for a wider operational range by maintaining a magnetic field when the coil is non-energized, enhancing the magnetocaloric effect and efficiency.

Implementation Method 1

a permanent magnet, a yoke and a coil. The magnetic field application unit applies a magnetic field to the magnetic working substance

Methodology Applied

Scientific EffectMagnetism: Magnetism

Implementation Method 2

The coil is capable of changing an intensity of the magnetic field applied to the magnetic working substance

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

enhancing the magnetocaloric effect and efficiency

Methodology Applied

Scientific EffectMagnetocaloric effect: Magnetocaloric Effect

Data Source

PatentUS11450465B2Magnetic field application device

Publication Date: 2022.09.20 DAIKIN INDUSTRIES LTD

AI summary

A magnetic field application device includes a magnetic field application unit provided with a magnetic working substance, a permanent magnet, a yoke and a coil. The magnetic field application unit applies a magnetic field to the magnetic working substance. The yoke forms at least two closed magnetic circuits, each being a closed circuit that magnetically connects both ends in a magnetization direction of the permanent magnet. The coil is capable of changing an intensity of the magnetic field applied to the magnetic working substance. The coil is provided in at least one of the closed magnetic circuits. The magnetic field application unit is disposed in at least one of the closed magnetic circuits. A magnetic flux of the permanent magnet is branched to flow through two or more of the closed magnetic circuits including the closed magnetic circuit provided with the magnetic field application unit when the coil is non-energized.