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.

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

Studies on the Effect of Graphite Content on Hardness and Electrical Resistivity of Silver-Graphite Composites

2012 ◽  
Vol 710 ◽  
pp. 326-331
Author(s):  
G.P. Khanra ◽  
S. Girikumar ◽  
De Gangadhar ◽  
Deepak K. Mishra ◽  
T.T. Saravanan ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Volume Fraction ◽  
Voltage Drop ◽  
Pure Silver ◽  
Graphite Content ◽  
Contact Voltage ◽  
Metallurgical Bond ◽  
Mechanical Devices ◽  
Constituent Elements ◽  
Graphite Composites

Silver-Graphite composites are attractive materials for electro-mechanical devices to provide noise free rotation between mating surfaces with minimum contact voltage drop. In the present study, the composite was processed through Powder Metallurgy (P/M) route considering that the constituent elements have divergent physical properties without any metallurgical bond between them. The developed composites were evaluated for hardness, electrical resistivity, contact voltage and density. This paper presents a correlation between hardness and electrical resistivity against volume fraction of graphite added, through linear regression which has clearly indicated that the said properties of the composites are highly dependent on the volume fraction of graphite. The hardness and electrical resistivity of the composites were found to obey the relations given below (i) Log H=1.522 + 1.667 Log (1-fg), (ii) 32.36 Log (ρ0/ρ) =1 + 83.74 Log (1-fg), where H is hardness of composites, ρ0 is electrical resistivity of pure silver, ρ is electrical resistivity of composites and fg is the volume fraction of graphite.

scholarly journals Brush Contact Voltage Drop for A. C.

TANSO ◽  
1956 ◽  
Vol 5 (3) ◽  
pp. 69-70
Author(s):  
Tatsuo Yamamura
Keyword(s):  
Voltage Drop ◽  
Contact Voltage

Influence of surface finish processing on contact voltage drop in Cu/C electrical sliding contacts

2010 ◽  
Vol 6 (1) ◽  
pp. 58-64 ◽  
Author(s):  
Kenichi Kadono ◽  
Shinji Yamaguchi ◽  
Noboru Morita ◽  
Minoru Aoyagi ◽  
Akio Tanaka ◽  
...  
Keyword(s):  
Surface Finish ◽  
Voltage Drop ◽  
Sliding Contacts ◽  
Contact Voltage

scholarly journals Effect of Au-Coating on the Laser Spot Cutting on Spring Contact Probe (SCP) for Semi-Conductor Inspection

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3300
Author(s):  
Youngjin Seo ◽  
Jungsoo Nam ◽  
Huitaek Yun ◽  
Martin Byung Guk Jun ◽  
Dongkyoung Lee
Keyword(s):  
Pulse Duration ◽  
Printed Circuit Boards ◽  
Contact Point ◽  
Coated Specimen ◽  
Laser Spot ◽  
Circuit Boards ◽  
Change Rate ◽  
Test Points ◽  
Spring Contact ◽  
Cutting Experiments

Spring contact probes (SCPs) are used to make contact with various test points on printed circuit boards (PCBs), wire harnesses, and connectors. Moreover, they can consist of the test interface between the PCBs and the semiconductor devices. For mass production of SCPs, ultra-small precision components have been manufactured by conventional cutting methods. However, these cutting methods adversely affect the performance of components due to tool wear and extreme shear stress at the contact point. To solve this problem, laser spot cutting is applied to Au-coated SCP specimens as an alternative technique. A 20 W nano-second pulsed Ytterbium fiber laser is used, and the experimental variables are different laser parameters including the pulse duration and repetition rate. After the spot cutting experiments, the heat-affected zone (HAZ) and material removal zone (MRZ) formed by different total irradiated energy (Etotal) was observed by using a scanning electron microscope (SEM). Then, the size of HAZ, top and bottom parts of MRZ, and roundness were measured. Furthermore, the change rate of HAZ and MRZ on Au-coated and non-coated specimens was analyzed with regard to different pulse durations. Based on these results, the effect of Au-coating on the SCP was evaluated through the comparison with the non-coated specimen. Consequently, in the Au-coated specimen, hole penetration was observed at a low pulse duration and low total energy due to the higher thermal conductivity of Au. From this study, the applicability of laser spot cutting to Au-coated SCP is investigated.

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