DC Motor Commutator Sealing Against Dust

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Solution Overview

Problem

Existing direct-current motor commutators face issues with dust and dirt accumulation between the sleeve and pressing ring, leading to potential damage and suboptimal performance.

Innovation Solution

A direct-current motor commutator structure featuring a sealing ring and polytetrafluoroethylene sealing element between the pressing ring and sleeve, along with a groove on the commutator surface, forms a sealing chain and reduces electric sparks, preventing dust and dirt accumulation and enhancing operational stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional commutator structure without sealing elements is used, then the device complexity is low, but dust and dirt accumulate between the sleeve and pressing ring causing damage

Engineering Contradiction:

Improvecommutator durabilityVSAvoidsealing structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A sealing ring is introduced as an intermediary element between the sleeve and pressing ring to prevent dust and dirt from entering the gap. This mediator component blocks the harmful particles while maintaining the mechanical function of the commutator, thus improving reliability without fundamentally changing the core structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful factor (dust and dirt accumulation) is extracted and isolated from the critical commutator components by using sealing elements. The sealing ring and polytetrafluoroethylene sealing element create a barrier that extracts contaminants from the operational area, preventing them from causing damage

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the commutator structure is simplified, then the ease of manufacture is high, but dust accumulation leads to commutator damage

Engineering Contradiction:

Improveresistance to dust and dirt accumulationVSAvoidmanufacturing complexity of sealing structure

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The sealing ring and polytetrafluoroethylene sealing element are relatively simple, inexpensive components that can be easily replaced if needed. These sealing elements provide effective protection against dust and dirt accumulation without requiring complex manufacturing processes, maintaining ease of manufacture while improving reliability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The sealing ring and polytetrafluoroethylene sealing element function as flexible sealing components that conform to the interface between the sleeve and pressing ring. These thin film-like sealing elements effectively block dust and dirt while being simple in structure and easy to manufacture

Inventive Principle:

Principle #30Flexible shells and thin films

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 prevents dust and dirt accumulation, reduces electric sparks, and ensures better working performance of the direct-current motor by maintaining a reliable sealing mechanism and reducing the risk of damage to the commutator.

Implementation Method 1

a sealing ring being provided at the abutment between the front pressing ring and the pressing plate, and at the abutment between the pressing plate and the sleeve

Methodology Applied

Scientific EffectSealing:

Implementation Method 2

a sealing element is potted or provided between the second portion and the sleeve; when a sealing element is provided between the second portion and the sleeve, the sealing element is a polytetrafluoroethylene sealing element

Methodology Applied

Scientific EffectSealing:

Implementation Method 3

a groove on the commutator surface, forms a sealing chain and reduces electric sparks

Methodology Applied

Scientific EffectSurface geometry effect:

Data Source

PatentUS11223176B2Direct-current motor commutator structure and direct-current motor

Publication Date: 2022.01.11 NEW UNITED RAIL TRANSIT TECH

AI summary

A direct-current motor commutator structure includes: a commutator base, comprising a front pressing ring, a pressing plate and a sleeve that are sequentially abutted, a sealing ring being provided between the front pressing ring and the pressing plate, and between the pressing plate and the sleeve constituting a bearing area; a commutator, mounted in the bearing area and having opposite first and second portions; a sealing element being potted or provided between the second portion and the sleeve; an equalizing cable, mounted on an outer side of a first potting area formed by the first portion, the pressing plate and the front pressing ring, abutting against the first portion and the front pressing ring, and covering the first potting area; and an armature coil, clinging to the equalizing cable and located on an outer side of a second potting area formed by the equalizing cable and the front pressing ring.