Metallic Yarn Conductive Ring for Motor Shaft Current Discharge

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Solution Overview

Problem

Existing conductive rings made of conductive plastic for motor shafts are prone to durability issues due to minimal flexibility and complex, time-consuming manufacturing processes, leading to electrolytic corrosion and bearing damage in high-capacity and high-torque driving motors.

Innovation Solution

An anti-electrolytic corrosion conductive ring featuring a metallic yarn fabric member made of stainless yarns, woven in a twill or plain weave pattern, coated with a conductive material, and fixed to a backplate between the motor housing and shaft, effectively guiding induced currents away from the bearing, enhancing durability and ease of manufacturing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If grounding protrusions are made of conductive plastic, then electrical connection is achieved, but flexibility and durability are reduced

Engineering Contradiction:

Improvedurability of grounding protrusionsVSAvoidflexibility of grounding protrusions

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention uses conductive yarn embedded in a flexible substrate material to create a grounding fabric that combines the electrical conductivity of metals with the flexibility of textile materials. This composite structure resolves the contradiction by providing both reliable electrical connection and mechanical flexibility.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the material state from rigid conductive plastic to flexible conductive textile, fundamentally altering the physical parameters of the grounding material to achieve both durability and flexibility simultaneously.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If flow paths are formed in grounding protrusions and protrusions are spaced apart, then current discharge is improved, but manufacturing complexity and time increase

Engineering Contradiction:

Improvecurrent discharge capabilityVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention extracts the grounding function from complex molded protrusions with flow paths and implements it through a simpler fabric structure where the conductive yarn network naturally provides current discharge pathways without requiring additional flow path formation steps.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The grounding fabric can be manufactured using cost-effective textile processing methods rather than complex injection molding, significantly reducing manufacturing time and complexity while maintaining effective current discharge capability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If grounding protrusions contact rotating shaft or housing, then current transmission is achieved, but durability deteriorates due to rotation

Engineering Contradiction:

Improvecurrent transmission capabilityVSAvoidservice life of grounding protrusions

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention uses a flexible fabric structure that can accommodate rotational movement without rigid contact, allowing the conductive yarn network to maintain electrical connection while flexing with the motion, thereby preventing wear and extending service life.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The grounding fabric is designed to be dynamic and adaptable, allowing it to move and flex with the rotating components rather than maintaining fixed rigid contact, which prevents wear and extends the service life of the grounding system.

Inventive Principle:

Principle #15Dynamics

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 prevents electrolytic corrosion, increases motor lifespan, and simplifies the manufacturing process by providing a flexible and durable grounding path that reduces wear and tear on the bearing, while ensuring proper current discharge without damaging the bearing balls.

Implementation Method 1

A current induced in the rotary shaft flows to the motor housing through the metallic yarn fabric member

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20240364189A1Anti-electrolytic corrosion conductive ring

Publication Date: 2024.10.31 PYUNGHWA OIL SEAL IND CO LTD

AI summary

An anti-electrolytic corrosion conductive ring includes a backplate located between a rotary shaft and a motor housing and fixed to the motor housing and a metallic yarn fabric member mounted to the backplate and made of metallic yarns electrically connecting the motor housing to the rotary shaft. A current induced in the rotary shaft flows to the motor housing through the metallic yarn fabric member.