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Solenoid

About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the magnetoelectric (ME) receiver is a sandwich of electroactive material bonded between two magnetostrictive layers, and the electroactive layer may be poled in its plane so that it can function in the stronger g33 mode.
Abstract: Electric power, sufficient for many in vivo applications, can be transmitted wirelessly from a small external solenoid (filled with a soft magnetic core), to a novel, magnetoelectric (ME) receiver a few centimeter (cm) inside the body. The ME receiver is a sandwich of electroactive (e.g., piezoelectric) material bonded between two magnetostrictive layers. The electroactive layer may be poled in its plane so that it can function in the stronger g33 mode (induced voltage parallel to the direction of principal magnetostrictive stress). Preliminary experimental results indicate that a 7 cm long ferrite-filled solenoid (NI ap 122 Amp-turns) producing an RMS magnetic field of order 1600 A/m (20 Oe) at the ME receiver (of volume 0.1 cm3) 3 cm from the field source, generates in the ME receiver a power of 200 mW (2 W/cm3). The receiver, in turn, generates a power of 160 mW.

62 citations

Patent
22 Jun 1993
TL;DR: In this paper, a combined currency acceptor and magnetic card reader for receiving and validating currency and for reading a magnetic card comprises an acceptor main body including a mounting plate for attaching the combined currency and card reader to a gaming machine.
Abstract: A combined currency acceptor and magnetic card reader for receiving and validating currency and for receiving and reading a magnetic card comprises an acceptor main body including a mounting plate for attaching the combined currency acceptor and magnetic card reader to a gaming machine. The main body has a gate housing attached to the mounting plate and a currency gate is movable by a solenoid and mounted in the gate housing. A display housing is attached the gate housing and including a currency opening, a magnetic card opening and a light emitting diode display to display to the user of the operating condition of the device. A motor and belt drive assembly is provided for driving the currency into the main body and a solenoid in the currency gate is activated to close the magnetic card opening when currency is being inserted. The same motor and a drive wheel drives the magnetic card into the magnetic card reader and the same solenoid in the gate housing is activated to close the magnetic card opening when the magnetic card is read as valid.

62 citations

Journal ArticleDOI
TL;DR: In this paper, a multi-physics theoretical model of a solenoid valve used in an automobile transmission is constructed using the finite element method, which includes the coupled effects of electromagnetic, thermodynamics and solid mechanics.

62 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic fields of cylindrical coils due to a surface current and a volume current were calculated using a simple experimental apparatus and compared with the measured magnetic fields.
Abstract: We calculate the magnetic fields of cylindrical coils due to a surface current and a volume current and compare our theoretical results to measured magnetic fields of two coil types: single-layer solenoid and cylindrical thick coil by a simple experimental apparatus. Good agreement is found with the theoretical results.

62 citations

Patent
26 Feb 1987
TL;DR: In this article, a pipe flow detector for activating a solenoid to automatically close a pipe shutoff valve in the event of a leak is presented, which consists of a piezoelectric film transducer attached to the pipe, the transducers producing a fluctuating electrical signal in response to pipe vibration.
Abstract: A pipe flow detector for activating a solenoid to automatically close a pipe shutoff valve in the event of a leak. The detector comprises a piezoelectric film transducer attached to the pipe, the transducer producing a fluctuating electrical signal in response to pipe vibration. An amplifier amplifies the signal, which is then passed to a tunable low-pass filter. The output from the filter is passed to an averaging circuit to produce an electrical signal representative of the total voltage changes of the fluctuating electrical signals. An LED is connected to the output of the averaging circuit to provide a means to tune the filter. The filter may be tuned by: (a) providing a pipe flow substantially equal to the pipe flow that would occur in the presence of a leak and tuning the filter to provide the brightest output of the LED; (b) starting and stopping pipe flow and tuning the filter to a point where an output of the LED is generally present only in the presence of a flow; or, (c) externally causing a starting and stopping pipe vibration and tuning the filter to a point where the LED generally does not become brighter in response to the externally caused pipe vibration. During unattended operation, the averaging circuit output is passed through an RC timing circuit that passes the averaging circuit output after a preselected period of time. A latchable level detector receives the timing means output and, when a high enough signal level is received, sends a signal to a solenoid driver which drives the solenoid.

62 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023144
2022292
2021230
2020404
2019459
2018596