Mitigation of lightning overvoltage in gas insulated substations concerning ferromagnetic ring effect

2016 ◽  
Vol 26 (12) ◽  
pp. 2573-2587 ◽  
Author(s):  
Amr M. Abd-Elhady ◽  
Mohamed E. Ibrahim ◽  
Arafa S. Mansour
Keyword(s):  
Ferromagnetic Ring ◽  
Ring Effect

scholarly journals Understanding the Coffee ring Effect on Self‐discharge Behavior of Printed micro‐Supercapacitors

2021 ◽  
Author(s):  
Jingzhi Hu ◽  
Zhaohua Xu ◽  
Kai Yuan ◽  
Chao Shen ◽  
Keyu Xie ◽  
...  
Keyword(s):  
Coffee Ring ◽  
Discharge Behavior ◽  
Coffee Ring Effect ◽  
Ring Effect

Influence of membrane character on suppression of coffee-ring effect

2021 ◽  
Author(s):  
S.S. Shahruddin ◽  
N. Ideris ◽  
N.F. Abu Bakar ◽  
A.L. Ahmad ◽  
N.F.C. Lah
Keyword(s):  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

Stability improvement for dried droplet pretreatment by suppression of coffee ring effect using electrochemical anodized nanoporous tin dioxide substrate

2020 ◽  
Vol 187 (12) ◽  
Author(s):  
Yuanchao Liu ◽  
Jie Pan ◽  
Zhenlin Hu ◽  
Yanwu Chu ◽  
Muhammad Shehzad Khan ◽  
...  
Keyword(s):  
Tin Dioxide ◽  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

Rotational Raman scattering and the ring effect in zenith-sky spectra

1995 ◽  
Vol 22 (7) ◽  
pp. 811-814 ◽  
Author(s):  
D. J. Fish ◽  
R. L. Jones
Keyword(s):  
Raman Scattering ◽  
Ring Effect

Beyond the coffee-ring effect: Pattern formation by wetting and spreading of drops

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Dileep Mampallil ◽  
Meenakshi Sharma ◽  
Ashwini Sen ◽  
Shubham Sinha
Keyword(s):  
Pattern Formation ◽  
Coffee Ring ◽  
Coffee Ring Effect ◽  
Ring Effect

scholarly journals The Active Magnetic Bearing Enables Optimum Damping of Flexible Rotor

1984 ◽  
Author(s):  
Helmut Habermann ◽  
Maurice Brunet
Keyword(s):  
Control System ◽  
Rotation Axis ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Flexible Rotor ◽  
Mechanical Contact ◽  
Electronic Control System ◽  
Electromagnetic Coils ◽  
Automatic Balancing ◽  
Ferromagnetic Ring

The active magnetic bearing is based on the use of forces created by a magnetic field to levitate the rotor without mechanical contact between the stationary and moving parts. A ferromagnetic ring fixed on the rotor “floats” in the magnetic fields generated by the electromagnets, which are mounted as two sets of opposing pairs. The current is transmitted to the electromagnetic coils through amplifiers. The four electromagnets control the rotor’s position in response to the signals transmitted from the sensors. The rotor is maintained in equilibrium under the control of the electromagnetic forces. Its position is determined by means of sensors which continuously monitor any displacements through an electronic control system. As in every control system, damping of the loop is provided by means of a phase advance command from one or more differenciating circuits of the position error signal. The capability of modifying the electromagnetic force both in terms of amplitude and phase leads to the benefit of specific properties for the application, in particular: - automatic balancing characterized by the rotation of the moving part around its main axis of inertia, and not around the axis of the bearings allowing operation without vibrations, - adjustable damping of the suspension allowing easy passing of the critical speeds of the rotor, - high and adjustable stiffness yielding maximum accuracy of rotor equilibrium position, - permanent diagnosis of machine operation due to the knowledge of all rotation characteristics (speed, loads on the bearings, position of the rotation axis, eccentricity, out-of-balance, disturbance frequency).

Sign in / Sign up

Export Citation Format

Share Document