Topic
Solenoid
About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.
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TL;DR: In this paper, the magnetic angle changer was incorporated into an existing electron impact spectrometer for the measurement of the excitation of the 2 3 S state of helium by impact of electrons from threshold to 24 eV.
Abstract: The magnetic angle changer recently invented by Read and co-workers (Read F H and Channing J M 1996 Rev. Sci. Instrum. 67 2373) has been incorporated into an existing electron impact spectrometer. Both the inner and the outer solenoids consist of a single layer of self-supporting thin copper tubing, cooled by circulating water. This construction makes the solenoid nearly optically transparent, reducing the interference of the new device with the flow of sample gas - a feature important for measurements of absolute cross sections and for the operation of a supersonic free jet. The properties of the device are illustrated with measurements of the differential cross sections for the excitation of the 2 3 S state of helium by impact of electrons from threshold to 24 eV. Spectra are presented at the scattering angles of 0°, 45°, 90°, 135° and 180°, important for deriving integral cross sections, and 145°, 155° and 165°, revealing interesting details of the interference of narrow ridge resonances with background scattering at angles surrounding the deep minimum of the angular distribution at 22 eV.
31 citations
TL;DR: In this paper, a simulation of the dynamic characteristics of a high-speed solenoid valve (HSV) was performed using the finite element method (FEM), and the interrelation between power losses and the dynamic response of the HSV was investigated based on the FEM simulation model.
31 citations
Patent•
27 Sep 1994
TL;DR: In this article, a solenoid drive circuit comprises a timing circuit which activates a voltage control circuit causing a voltage regulator to reduce the voltage output by the driver circuit from a high initial level to a lower holding level.
Abstract: A solenoid drive circuit comprises a timing circuit which activates a voltage control circuit causing a voltage regulator to reduce the voltage output by the driver circuit from a high initial level to a lower holding level sufficient for the solenoid to remain energized. The timing circuit comprises a resistor and capacitor in parallel and the duration of the initial higher voltage output is inversely proportional to the input voltage level. The timing circuit activates a transister in the control circuit changing the equivalent resistance between the adjustment terminal of the voltage regulator and ground thereby causing a reduction in the output voltage.
31 citations
TL;DR: In this article, the authors proposed a new kind of superconducting inductor for a synchronous motor with eight poles, which can be considered as an inductor of an eight-pole motor.
Abstract: Electrical motors need a spatial variation of the flux density created by their inductors to make torque. We propose to achieve this angular repartition of the induction with bulk high temperature superconducting plates and two low temperature superconducting solenoids. These solenoids have the same axis and are fed with opposite currents in order to create a radial magnetic induction. Four superconducting plates placed on the cylindrical surface, situated on the same axis and having the same radius as the solenoids, concentrate the magnetic field. This device provides a spatial variation of the flux density, and can be considered as an inductor for a synchronous motor with eight poles. This paper presents the experimental study of our prototype at 4.2 K. We compare the experimental results with calculation. Ten Hall probes permit us to reconstitute the angular variation of the flux density. The paper shows the feasibility of this new kind of superconducting inductor.
31 citations