Topic
Insulator (electricity)
About: Insulator (electricity) is a research topic. Over the lifetime, 15941 publications have been published within this topic receiving 108950 citations. The topic is also known as: electrical insulator.
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Patent•
12 Jan 2012
TL;DR: In this article, a bus bar is inserted into a through-hole formed in the housing 30 of the ECU to prevent the bus bar from contacting a housing of an electronic control unit and electronic parts.
Abstract: PROBLEM TO BE SOLVED: To provide an electric power steering device which prevents a bus bar of an electric motor from contacting a housing of an electronic control unit (ECU) and electronic parts.SOLUTION: The electric motor 18 for assisting the steering includes the bus bar 32 extended from the electric motor 18. The ECU, which controls the drive of the electric motor 18, includes a housing 30 and a power source module 31 consisting of an insulator provided in the ECU, while the power source module 31 includes a power supply bus bar 33 extended from the power source module 31. On the power source module 31, an extension part 35 is also formed that contacts the electric motor 18. This extension part 35 is inserted into a through-hole formed in the housing 30 of the ECU. In the extension part, a bus bar insertion hole 34, through which the bus bar 32 extended from the electric motor 18 is passed, is formed.
69 citations
TL;DR: In this article, an impact ionization model was proposed to predict negative-resistance type of SiO2 dielectric instability, where electrons are injected from the cathode, the electron distribution is heated, hot electrons ionize the lattice, and the residual positive charge distorts the electric field and further increases impact ionisation.
Abstract: Dielectric instability and breakdown in SiO2 have been well characterized by many experimental techniques, including measurements of thickness dependence, contact barrier dependence, and time dependence of breakdown as well as a determination of radiation sensitivity and prebreakdown charge buildup within the insulator. All of the various types of data can be explained consistently by an impact ionization model, which predicts a negative‐resistance type of instability; electrons are injected from the cathode, the electron distribution is heated, hot electrons ionize the lattice, and the residual positive charge distorts the electric field and further increases impact ionization. The model is sensitive to two key parameters, the ionization bandgap Ei, and the electron–phonon scattering length λ.
69 citations
TL;DR: In this article, it was shown that breakdown paths were inclined to the electric field in the presence of a magnetic field normal to the insulator surface, analogous to the Hall effect for bulk conduction.
Abstract: Insulator samples of Plexiglas and alumina ceramic in vacuum have been subjected to high‐voltage pulses with rise times of a few nanoseconds. Breakdown paths were inclined to the electric field in the presence of a magnetic field normal to the insulator surface, analogous to the Hall effect for bulk conduction. These results, as well as measurements of the flashover propagation velocity, strongly support a model of the flashover mechanism based on secondary electron emission.
69 citations
TL;DR: In this article, high-energy electron bombardment of Me-SiO2-Si and MeSi3N4-Si capacitors has been investigated by means of C-V and G-V measurements.
Abstract: High-energy electron bombardment of Me-SiO2-Si and Me-Si3N4-Si capacitors has been investigated by means of C-V and G-V measurements. The bombardment usually results in the introduction of positive charge into the insulator. This effect is explained by a physical model which involves interaction of secondary electrons with the insulator lattice to generate electron-hole pairs and predominant trapping of holes in the insulator. Dependence of radiation sensitivity on initial surface state density, gate thickness, oxidation procedure, surface orientation, bombardment bias, and previous radiation history, as well as the annealing behavior was studied.
68 citations
TL;DR: In this article, the contamination performance of non-ceramic (NO) and porcelain (Porcelain) insulators is compared with silicone rubher (Rubher) and silicone rubber insulators.
Abstract: The contamination performance of non-ceramic (NO insulators is better than porcelain insulators. The paper describes the pollution collection mechanism and concludes that silicone rubher insulators collect more pollution than porcelain insulators. Long term exposure of silicone rubber insulators produces a thin layer of pollution, which is a mixture of dust, salt and silicone oil. Fog or morning dew produces droplets on the flat surfaces and forms conductive regions. Spot discharge starts between the regions, which reduces hydrophobicity. Simultaneously, dry-band arcing starts on the shank of the insulator. The two arcs join together, which leads to flashover. The flashover voltage of polluted NC insulators is significantly higher than porcelain ones. Insulator performance is measured with laboratory tests. However, salt-fog and clean-fog tests can give different flashover values.
68 citations