Experimental Investigation of Contact Welding Characteristics of Electromechanical Relays

Xu, Zili; Ren, Wanbin; Wang, Shujuan

doi:10.1109/tie.2020.3009565

Cited by 20 publications

(3 citation statements)

References 17 publications

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“…Noting that equation ( 12) neglects the influence of other types of electrodynamic force arising from conductor structures and only considers the balance between the Holm force and the contact force. After a simple calculation based on equation (12), we find that the use of a LM bridge liberates a switch equipment from a tens of Newton contact force, which might be provided by a spring, an electromagnetic coil or other types of holding mechanism, especially when the inrush current gets more than 5 kA. In this case, the LM bridge enabled contact facilitates compact electrical switch devices for high current applications, with no need of a heavy mechanism to take up space and consume energy at an on-state.…”

Section: Current Withstand Ability Of the Lm Bridge Enabled Contactmentioning

confidence: 99%

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Robust electrical contacts integrating a liquid metal bridge for mechanical switches

Zhu¹,

Yang²,

Wang³

et al. 2022

J. Phys. D: Appl. Phys.

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Intrinsic roughness of solid surfaces causes a series of inevitable shortcomings in the use of mechanical electrical contacts, among which one of the most fatal is the repulsive electrodynamic force arising from high currents. A large contact force coming from a heavy holding mechanism helps to suppress the repulsive effect whereas the mechanism consumes energy and remains to be challenging for a compact switching device. Here, a liquid metal (LM) bridge is introduced to wet solid electrodes to eliminate contact issues. Four instability patterns induced by the electromagnetic pinch effect are identified to characterize LM bridge’s response to high currents. Simulation results reveal that an inner vortex caused by uneven distributions of current density and electrodynamic volume force leads to the rupture of a necked LM bridge. With a uniform structure, a cylindrical LM bridge is proved to be robust with respect to an impulse current higher than 10 kA, exceeding a commercial compact relay by a factor of more than 10 in terms of current withstand performance. Our research facilitates compact and energy-saving switch equipment and has a potential to realize arbitrary desired levels of high current withstand without the use of a holding mechanism. This paper also offers deep insights into the high current applications of LM from the perspective of fluid related physical mechanisms.

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Section: Current Withstand Ability Of the Lm Bridge Enabled Contactmentioning

confidence: 99%

“…While the electrodynamic repulsion force could be suppressed in a way, flow of a high magnitude current through a-spots produces massive Joule heat. Consequently, the solid metals tend to be melted and welded together, thereby fail to open in the next operation [11,12].…”

Section: Introductionmentioning

confidence: 99%

Robust electrical contacts integrating a liquid metal bridge for mechanical switches

Zhu¹,

Yang²,

Wang³

et al. 2022

J. Phys. D: Appl. Phys.

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“…At electrical contact welding, iron-based tapes with the addition of nickel are used, which makes this method more economically profitable than electrical contact welding, which uses powders with the closest chemical composition to the part being restored [8].…”

Section: Introductionmentioning

confidence: 99%

Application of metal powders to bronze bushings

Golinitskiy

Темасова

Cherkasova

et al. 2022

J. Phys.: Conf. Ser.

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Bronze bushings have become widespread in the mobile data of machines, the reuse of which is complicated by the insufficient elaboration of the recovery technology, which has a negative impact on environmental friendliness. To improve the current situation, we carried out research on the development of a technology that allows electrocontact welding of metal powders of nickel and iron onto bodies of revolution made of bronze. The main difficulty on the way of applying this method of recovery is the different melting temperature of bronze and welded metal powders, but the use of a special shell developed by us and the modes identified made it possible to solve this problem.

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Overview on Contact Bounce Phenomena of Electromagnetic Type Switch Electrical Apparatus

Wang,

Zhu,

Wang

et al. 2024

Lecture Notes in Electrical Engineering

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Experimental Investigation of Contact Welding Characteristics of Electromechanical Relays

Cited by 20 publications

References 17 publications

Robust electrical contacts integrating a liquid metal bridge for mechanical switches

Robust electrical contacts integrating a liquid metal bridge for mechanical switches

Application of metal powders to bronze bushings

Overview on Contact Bounce Phenomena of Electromagnetic Type Switch Electrical Apparatus

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