Magneto Generator Axial Magnet Positioning

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Solution Overview

Problem

Existing magneto generators face issues with permanent magnets moving axially due to increased weight or external loads, such as engine vibration, as they lack effective mechanisms to restrict axial movement, leading to potential displacement and increased processing costs for restricting movement.

Innovation Solution

Incorporating a magnet coming-off preventing member with a wedge-shaped protrusion or groove on the flywheel's inner peripheral wall surface and a collar portion embedded in a non-magnetic resin member to provide shearing stress support, preventing axial movement of permanent magnets while maintaining low construction costs and simplicity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If permanent magnets are fixedly secured to the flywheel using only circumferential set portions, then the circumferential movement is restricted, but the axial movement cannot be restricted, leading to potential displacement under increased weight or external load

Engineering Contradiction:

Improvepositioning reliability of permanent magnetsVSAvoidstructure complexity for restricting axial movement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention transitions from restricting only circumferential movement (one dimension) to restricting both circumferential and axial movement (two dimensions) by adding the magnet coming-off preventing member that extends in the axial direction, thereby preventing displacement in multiple directions simultaneously

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The magnet coming-off preventing member acts as an intermediary component between the permanent magnets and the flywheel, providing the additional axial restriction function without directly modifying the permanent magnets or the flywheel structure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If plastic deformation engagement segments are used to restrict axial movement of permanent magnets, then axial movement is restricted, but the processing cost becomes high

Engineering Contradiction:

Improveaxial movement restrictionVSAvoidprocessing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The magnet coming-off preventing member is designed as a simple, inexpensive component made of resin or metal that can be easily manufactured and installed, replacing the costly plastic deformation engagement segments while achieving the same axial movement restriction function

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention changes the material parameter from requiring plastic deformation (metal engagement segments) to using a simple structural form (protrusion or groove in resin or metal member), thereby reducing manufacturing complexity and cost while maintaining the axial restriction function

Inventive Principle:

Principle #35Parameter changes

3Power

If the weight of permanent magnets is increased to improve magnetic field strength, then power generation capability is improved, but the risk of axial displacement increases due to insufficient suppression force

Engineering Contradiction:

Improvepower generation capabilityVSAvoidaxial position stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The magnet coming-off preventing member provides preliminary counter-action against axial displacement forces before they can cause displacement, creating a preventive mechanism that allows heavier magnets to be used without increasing displacement risk

Inventive Principle:

Principle #9Preliminary anti-action

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 solution effectively enhances the proof strength of permanent magnets against axial movement, preventing displacement and reducing processing costs, while ensuring easy construction and maintaining magnetic field integrity for efficient power generation.

Implementation Method 1

a magneto generator which generates electricity under the electromagnetic induction action of permanent magnets and magneto coils in accordance with the rotation of a flywheel

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS7847459B2Magneto generator

Publication Date: 2010.12.07 MITSUBISHI ELECTRIC MOBILITY CORP

AI summary

A magneto generator can increase a suppression force to suppress permanent magnets from being moved to an opening side of a flywheel with easy construction and at low cost. In this magnet generator, the flywheel has a groove formed on its inner peripheral wall surface at an opening side thereof, and a magnet positioning member has a magnet coming-off preventing member formed at the opening side of the flywheel so as to cover end faces of the permanent magnets, with a protrusion being formed on the magnet coming-off preventing member so as to engage the groove in the flywheel. The protrusion is in engagement with the groove whereby the movement in an axial direction of the permanent magnets can be suppressed.