Magnet-Based Arc Steering for Railway Contact Units

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Solution Overview

Problem

Uninterrupted contact between contact strips and overhead wires in vehicles is challenging due to adhesions like hoarfrost or ice, leading to electric arcs that damage the contact strip support, especially during standstill or low speeds, and existing solutions fail to reliably prevent flashovers in these conditions.

Innovation Solution

A contact unit with a sliding contact device equipped with a magnet-based steering device that redirects electric arcs away from the contact strip support, preventing damage by ensuring the arcs strike the contact strip instead, thus protecting the support profile from heat-induced destruction and prolonging the service life of the contact unit and positioning device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If air flow is used to deflect electric arcs during vehicle travel, then electric arcs are steered away from the contact strip support, but electric arcs still flash over between the overhead wire and contact strip support during standstill or low speeds due to lack of air flow

Engineering Contradiction:

Improveprotection from electric arc damageVSAvoideffectiveness across different vehicle speeds

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent replaces the mechanical air flow system with a magnetic field-based steering device. The magnetic field acts on the electric arc plasma to deflect it away from the contact strip support, providing protection that is independent of vehicle speed and air flow conditions. This substitution resolves the contradiction by maintaining reliable protection during standstill and low speeds where air flow is insufficient.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical parameter used for arc steering from aerodynamic force (air flow) to electromagnetic force (magnetic field). The magnetic field strength and distribution can be controlled to effectively steer arcs across all vehicle operating conditions, including standstill, low speed, and high speed travel, thereby achieving adaptability across different speeds.

Inventive Principle:

Principle #35Parameter changes

2Strength

If contact strip support is made of metal for structural strength, then positioning device can be securely built, but electric arcs cause heat introduction leading to melting, evaporation or material loss of the support

Engineering Contradiction:

Improvestructural strength of contact strip supportVSAvoidheat damage from electric arcs

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a magnetic field as an intermediary between the electric arc and the metal contact strip support. The magnetic field steers the electric arc away from the support structure, preventing direct heat transfer to the metal. This allows the support to maintain its metal construction for structural strength while avoiding the harmful thermal effects of electric arcs.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If sliding contact is maintained continuously for power supply, then vehicle can be supplied with power during travel and stop, but brief separation occurs due to adhesions like hoarfrost or ice causing electric arcs

Engineering Contradiction:

Improvecontinuous power supply to vehicleVSAvoiduninterrupted contact between contact strip and overhead wire

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful effect of electric arcs (which occur during brief separations caused by adhesions) into a controlled phenomenon. By using the magnetic field to steer arcs away from critical components, the system allows brief separations to occur without causing damage to the contact strip support or positioning device, thereby maintaining reliability while preserving continuous power supply capability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 magnet-based steering device effectively deflects or extinguishes electric arcs, preventing them from striking the support profile, thereby reducing material consumption and extending the lifespan of the sliding contact device and positioning device, even in adverse weather conditions.

Implementation Method 1

the steering device being provided with a magnet

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

a magnet-based steering device that redirects electric arcs away from the contact strip support, preventing damage by ensuring the arcs strike the contact strip instead

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Data Source

PatentUS11532444B2Contact unit for supplying vehicles with power and related method

Publication Date: 2022.12.20 SCHUNK CARBON TECH GMBH

AI summary

The invention relates to a contact unit and to a method for steering electric arcs on a contact unit, in particular for supplying vehicles with power via an overhead wire (20), the contact unit comprising a sliding contact device (19), the sliding contact device having a contact strip support (21) and a contact strip (22) disposed thereon, the contact unit having a steering device (24) for electric arcs (25) which is disposed on the contact unit, the steering device being provided with a magnet (30).