Viscous and Joulean power losses in liquid-metal sliding electrical contacts with finite electrically conducting electrodes

1995 ◽  
Vol 10 (4) ◽  
pp. 634-644 ◽  
Author(s):  
G. Talmage ◽  
S. Mazumder ◽  
S.H. Brown ◽  
N.A. Sondergaard
Keyword(s):  
Liquid Metal ◽  
Electrical Contacts ◽  
Power Losses ◽  
Electrically Conducting ◽  
Sliding Electrical Contacts

Liquid‐metal flows in sliding electrical contacts with arbitrary magnetic‐field orientations

1991 ◽  
Vol 3 (6) ◽  
pp. 1657-1665 ◽  
Author(s):  
G. Talmage ◽  
J. S. Walker ◽  
S. H. Brown ◽  
N. A. Sondergaard ◽  
H. Branover ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Electrical Contacts ◽  
Sliding Electrical Contacts ◽  
Arbitrary Magnetic Field

scholarly journals Liquid metal sliding contacts for electric machines

2021 ◽  
Vol 2094 (4) ◽  
pp. 042044
Author(s):  
A V Egorov ◽  
Yu F Kaizer ◽  
A V Lysyannikov ◽  
A V Kuznetsov ◽  
Yu N Bezborodov ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Operating Mode ◽  
Electrical Equipment ◽  
Electric Machines ◽  
Electrical Contacts ◽  
Sliding Contact ◽  
Sliding Contacts ◽  
Friction Mode ◽  
Sliding Electrical Contacts ◽  
Sliding Electric Contact

Abstract The electric sliding contact in the brush mechanism is one of the most unreliable components of electric machines of alternating and direct current and other electrical equipment in which the transmission of electric current is carried out using sliding contacts that require fairly frequent maintenance and can be a source of sparking. It is possible to increase the reliability and efficiency of electric machines with sliding electric contacts by replacing the dry friction mode with the liquid friction mode in the sliding electric contact. The most appropriate material for use in the construction of a liquid metal sliding contact is gallium. When replacing the sliding electrical contacts of asynchronous electric machines with a phase rotor from traditional solid to liquid metal gallium, it is possible to increase their power up to 1.4 times due to the availability of a higher thermal operating mode.

Experimental study of sliding electrical contacts in a multi-shot railgun

2010 ◽  
Vol 22 (4) ◽  
pp. 923-926 ◽  
Author(s):  
刘传谱 Liu Chuanpu ◽  
袁伟群 Yuan Weiqun ◽  
严萍 Yan Ping ◽  
孙鹞鸿 Sun Yaohong ◽  
孙连华 Sun Lianhua
Keyword(s):  
Experimental Study ◽  
Electrical Contacts ◽  
Sliding Electrical Contacts

The Effect of Current on the Lubrication of Sliding Electrical Contacts

1972 ◽  
Vol 15 (3) ◽  
pp. 192-200 ◽  
Author(s):  
J. Fisher ◽  
K. J. Campbell ◽  
T. F. J. Quinn
Keyword(s):  
Electrical Contacts ◽  
Sliding Electrical Contacts

Influence of Surface Roughness on Friction and Contact Resistance in Sliding Electrical Contacts

2007 ◽  
Author(s):  
Dinesh G. Bansal ◽  
Jeffrey L. Streator
Keyword(s):  
Surface Roughness ◽  
Contact Resistance ◽  
Coefficient Of Friction ◽  
Electrical Contact ◽  
Electrical Current ◽  
Electrical Contacts ◽  
Sliding Electrical Contacts ◽  
The Coefficient Of Friction ◽  
Current Densities

An experiment is conducted to investigate the role of surface roughness on the coefficient of friction and contact resistance of sliding electrical contacts. A hemispherical pin is sliding along both smooth and rough 2-meter rail surface. Tests are performed at both low and moderate sliding speed and for a range of electrical current densities, ranging from 0 to about 12 GA/m2. It was found that surface roughness had a significant influence on the coefficient of friction, with the smoother surfaces exhibiting higher coefficients of friction. Contact resistance, on the other hand, did not show as strong an effect of surface roughness, except for a few parameter combinations. At the higher current densities studied (>10 GA/m2), it was found that the contact resistance values tended to be on the order of 1 mΩ, independent of load, speed and roughness. This convergence may be due to presence of liquid metal film at the interface, which established ideal electrical contact.

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