Electrostatic Spacing Shield for Stable GDT Breakdown Voltage

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Solution Overview

Problem

Conventional gas discharge tubes in electric motors are susceptible to variations in manufacturing, wear, and debris, which can cause components to come too close, altering the breakdown voltage and potentially damaging electronic components or posing safety risks.

Innovation Solution

A spacing-assured gas discharge tube assembly with an electrostatic spacing shield that acts as a physical barrier, maintaining a safe distance from adjacent structures to prevent electrostatic interference and ensure consistent breakdown voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If no spacing shield is used, then device complexity is reduced, but manufacturing precision deteriorates due to component placement variations and wear

Engineering Contradiction:

Improvestructure complexityVSAvoidcomponent spacing

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The spacing shield is designed with pre-formed spacing features (ridges, protrusions, or integrated structures) that establish the correct distance between the gas discharge tube and adjacent conductive components before final assembly. This preliminary positioning action ensures consistent spacing without requiring high-precision component placement during manufacturing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The spacing shield acts as an intermediary component between the gas discharge tube and adjacent conductive structures. It physically mediates the spacing relationship, ensuring that even if manufacturing tolerances cause component variations, the shield maintains the required distance to prevent electrical breakdown.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If spacing shield is added, then reliability is improved by preventing close proximity, but device complexity increases

Engineering Contradiction:

Improvebreakdown voltage consistencyVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The spacing shield is designed to combine multiple functions into a single component: it provides spacing assurance, acts as a physical barrier against debris, and can serve as a mounting structure or alignment feature. This merging reduces the need for separate components and simplifies the overall assembly process despite adding reliability features.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The spacing shield can be implemented as a thin-walled structure or flexible barrier that provides adequate spacing protection without adding significant bulk or complexity. The thin film or shell structure maintains the required distance while being easy to manufacture and install.

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-affected harmful factors

If spacing shield is used, then protection against debris and wear is improved, but manufacturing precision requirements increase for the shield itself

Engineering Contradiction:

Improvedebris and wear protectionVSAvoidshield fabrication

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The spacing shield can be designed as a segmented or modular structure that is easier to manufacture with standard tolerances. By dividing the shield into sections or using simple geometric features (ridges, protrusions), the manufacturing precision requirements for each individual feature are reduced while still achieving the overall spacing goal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spacing shield can be made from composite materials or molded plastics that are easy to fabricate with consistent dimensions. Using materials that are resistant to wear and debris accumulation further reduces the precision requirements, as the shield itself becomes more durable and maintains its spacing function over time.

Inventive Principle:

Principle #40Composite materials

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 shield maintains the breakdown voltage by preventing close proximity of conductive components, thereby protecting electronic components and ensuring reliable operation.

Implementation Method 1

Gas discharge tubes operate on a spark gap principle. Upon a large enough potential difference, the air or other gas will ionize and provide an electrical conduit.

Methodology Applied

Scientific EffectIonization: Ionisation

Implementation Method 2

The potential difference at which the gas discharge tube becomes conductive can be affected by nearby conductive components by altering the electric field in the gas

Methodology Applied

Scientific EffectElectrostatic field: Electric Field

Implementation Method 3

Methodology Applied

Scientific EffectElectrostatic shielding: Faraday Cage

Data Source

PatentUS12477650B2Spacing-assured electric field shield for gas discharge tube of motor control

Publication Date: 2025.11.18 NIDEC MOTOR CORP

AI summary

A spacing-assured gas discharge tube assembly is installed on a printed circuit board, which may be part of a motor controller. The discharge tube assembly includes a tube body and an electrostatic spacing shield disposed at least partially around the tube body. The shield is configured to prevent close physical proximity of adjacent structures having electrostatic fields that may alter the breakdown voltage of the tube body.