Relationship between Contact Voltage Drop and Frictional Coefficient under High-current Sliding Contact

2010 ◽  
Vol 5 (4) ◽  
pp. 486-492 ◽  
Author(s):  
Takahiro Ueno ◽  
Kenichi Kadono ◽  
Shinji Yamaguchi ◽  
Minoru Aoyagi ◽  
Akio Tanaka ◽  
...  
Keyword(s):  
Voltage Drop ◽  
Frictional Coefficient ◽  
Sliding Contact ◽  
High Current ◽  
Contact Voltage

scholarly journals New Bi-Mode Gate-Commutated Thyristor Design Concept for High-Current Controllability and Low ON-State Voltage Drop

2016 ◽  
Vol 37 (4) ◽  
pp. 467-470 ◽  
Author(s):  
N. Lophitis ◽  
M. Antoniou ◽  
U. Vemulapati ◽  
M. Arnold ◽  
I. Nistor ◽  
...  
Keyword(s):  
Voltage Drop ◽  
Design Concept ◽  
High Current

Preparation and Characterization of CMC-PVA/PVA-SA-MePc (COOH)8/CS-PVA Bipolar Membrane Using Electrospinning Technique

2013 ◽  
Vol 774-776 ◽  
pp. 795-798
Author(s):  
Ting Jin Zhou ◽  
Min Lu ◽  
Ri Yao Chen
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Splitting ◽  
Current Density ◽  
Voltage Drop ◽  
High Current Density ◽  
High Current ◽  
Bipolar Membrane ◽  
Electrospinning Technique ◽  
Exchange Layer

Carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA) and chitosan (CS)-polyvinyl alcohol were cross-linked by Fe3+and glutaraldehyde respectively to prepare cation exchange layer and anion exchange layer, and polyvinyl alcohol-sodium alginate (SA)-metal octocarboxyphthalocyanine (MePc (COOH)8, a kind of water splitting catalyst, here, Me stands for Fe3+or Co2+) nanofibers were prepared by electrospinning technique and introduced into the interlayer to obtain the CMC-PVA/PVA-SA-MePc (COOH)8/CS-PVA bipolar membrane (BPM). The experimental results showed that compared with the BPM without the PVA-SA-MePc (COOH)8interlayer, the water splitting efficiency at the interlayer of the CMC-PVA/PVA-SA-MePc (COOH)8/ CS-PVA BPM was obviously increased, and its membrane impedance decreased. When the concentration of FePc (COOH)8in the PVA-SA-FePc (COOH)8nanofibers was 3.0%, the trans-membrane voltage drop (IRdrop) of the CMC-PVA/PVA-SA-FePc (COOH)8/CS-PVA BPM was as low as 0.6V at a high current density of 90 mA/cm2.

The Effect of Electrical Switch Structure to the Contact Voltage-Drop and Temperature Variations

2013 ◽  
Vol 284-287 ◽  
pp. 1109-1115
Author(s):  
Chyouh Wu Huang
Keyword(s):  
Temperature Increase ◽  
Voltage Drop ◽  
Contact Point ◽  
Modern Technology ◽  
Consumer Products ◽  
Electrical Device ◽  
Contact Voltage ◽  
Switch Structure ◽  
Compression Spring ◽  
Spring Contact

Due to the continuing renovation of the modern technology and the demand for the better consumer products, electricity has become one of the important factors that affect people’s life. The electrical switch is an important element of the electrical device and has been used intensively in industry and transportation devices, such as electrical bicycle, electrical motorcycle, winch etc. As the increasing usage of the electrical switch, the switch quality requirement increases as well. The important factors are contact point mass transferring loss, electric arc energy and contact point resistance and loss. Once the contact point fails to function, the whole electrical device ceases to function. However, regarding the electrical efficiency, in addition to the effect of the contact point materials, the structure is an important factor. In this study the structure of the electrical switch is studied and the effects of spring stiffness, guiding pin and ring to the switch lifespan are discussed. Taguchi method was used to design the experiment. L9(34) Orthogonal Array table was used to perform and discuss the effect of four factors to the desired characteristics; that is to minimize both the contact voltage-drop and the contact temperature increase. Four factors chosen are guiding pin material, compression spring, contact spring and buckle. Test results show that contact spring has the most effectiveness to the contact voltage-drop and temperature increase and is followed by compression spring. Guiding pin and ring type have minimum influence.

A Comparative Study on the Effect of Surface Topography by Hard Turning vs. Grinding on Frictional Performance at Dry and Lubricated Sliding Contact

2008 ◽  
Author(s):  
R. A. Waikar ◽  
Y. B. Guo
Keyword(s):  
Surface Topography ◽  
White Layer ◽  
Frictional Coefficient ◽  
Solid Lubricants ◽  
Bearing Steel ◽  
Tribological Performance ◽  
Sliding Contact ◽  
Frictional Performance ◽  
Dry Conditions ◽  
Frictional Coefficients

Machining-induced surface topography has a significant effect on tribological performance of machined components in sliding contact. However, the effect of different surface topography by turning versus grinding on tribological performance has received very little attention. In this study four types of surface topography by turning and grinding AISI 52100 bearing steel (62 HRc) were prepared and characterized to study its effect on friction and wear in sliding contact. Dry and lubricated reciprocating sliding wear tests with an on-line acoustic emission (AE) sensor were carried out using a ball-on-disk tribometer. The experimental results have shown that: (i) the turned surfaces, regardless of the presence of a white layer, yield smaller friction of coefficients in sliding along feed marks than across sliding at both dry and lubricated conditions. However, the opposite hold true for the ground surfaces; (ii) friction of coefficients (0.6∼0.8) at dry conditions is higher for both turned and ground fresh surfaces than their white layer counterparts regardless of sliding direction. At lubricated conditions, Friction of coefficients (0.1∼0.12) are smaller for the both turned and ground fresh surfaces than the white layer surfaces in along sliding, while it is equivalent in across sliding; (iii) the trends of acoustic amplitude amplitude are consistent with those of frictional coefficients for the turned or ground surfaces at dry conditions. Similar trends are also true for the turned surfaces at lubricated conditions, but not for the ground surfaces; and (iv) the wear debris on the track may act as solid lubricants to reduce the sliding frictional coefficient. Machining induced white layers leads to a better wear resistance than the fresh surfaces in either along or across sliding.

scholarly journals BURNING MODES OF A BIPOLAR PULSED DISCHARGE IN CO2

2020 ◽  
pp. 159-164
Author(s):  
V.A. Lisovskiy ◽  
S.V. Dudin ◽  
M.M. Vusyk ◽  
V.D. Yegorenkov
Keyword(s):  
Duty Cycle ◽  
Voltage Drop ◽  
Current Mode ◽  
High Current ◽  
Pulsed Discharge ◽  
Frequency Range ◽  
High Duty Cycle ◽  
Cycle Amplitude ◽  
Self Bias ◽  
Voltage Axis

We have studied the burning modes of the bipolar pulsed discharge in CO2 within the frequency range between 20 and 300 kHz and the duty cycle of 11...97 %. The current and voltage waveforms within the pressure range between 0.1 to 1 Torr were registered. We have established that the duty cycle values may affect the axial structure of the discharge considerably causing the voltage drop redistribution across the electrodes. The bipolar pulsed discharge may burn in a high-current mode (with cathode sheaths near every electrode) as well as in a low-current one (with a low discharge current and weak glow). The transition between these modes may be observed at high duty cycle values. We have found that one may make a shift of the complete oscilloscope voltage pattern higher or lower along the voltage axis and produce a self-bias constant voltage the value and sign of which depend on the duty cycle, amplitude and frequency of the applied voltage.

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