Inductance

This paper presents method of deriving optimal excitation signal maximizing probability of successful fault diagnosis. The approach uses evolutionary algorithm and wavelet analysis. The diagnosis procedure is conducted by means of specialized aperiodic excitation. Results are compared with fault diagnosis using unit step excitation. The method belongs to simulation before test (SBT) class of fault diagnosis procedure and focuses on case where only input and output nodes of integrated circuit under test (CUT) are available.

ABSTRACT The paper presents design, simulation, implementation and testing of an inductive displacement sensor based on a Linear Variable Differential Transformer (LVDT) controlled by a single chip electronic module with 16 bit RISC microcontroller. LVDT device is widely used in hydraulic and pneumatic mechatronic systems for measuring physical quantities like displacement, force or pressure; it consists of two magnetic coupled coils with a common moving core; its displacement is converted in reluctance variation of magnetic circuit. Standard electronics for LVDT sensor conditioning is analog - quadrate oscillator, synchronous demodulator and amplifiers - but has its drawbacks - relative complex, hard to adjust, many components and packages, no connection to computer systems. The originality aspects of the work come from the unique method of finding displacement information by switching supply voltage in the coils of inductive device. This method uses only peripherals from a microcontroller so is low cost and easy to adjust. Present paper focuses on modelling and simulation of displacement measuring method but analyzes also implementation aspects for a real application (an electro hydraulic position control system).

This paper proposes a new configuration to help a GTO to achieve unity turn-off gain and snubberless turn-off capability by utilizing a series connected discrete diode. The maximum turn-off gate voltage, which is crucial for realizing a high commutation di/dt in the GTO gate loop, can be increased from about 20 V of a GTO's gate-cathode breakdown to a voltage

This study focuses on the calculation of inductances and torque of a synchronous reluctance machine having an axially laminated anisotropic rotor. Two techniques based on the winding function (WF) theory are used for the computations. One technique, of the ...

Running rails in electrified transportation systems are the interface element for several phenomena related to system performance, electromagnetic compatibility and safety: useful voltage at rolling stock, short circuit current, induced voltage, stray current, and track circuit operation. This work presents the physical and mathematical groundings of rail electrical parameters (DC and AC resistance, AC internal and external inductance) and experimental results available in the literature, discussing variability and reliability for each interface. The results consist thus of the identification of the relevant rails longitudinal electrical parameters, the presentation of a set of reliable experimental values, and the discussion of the best approach to manage their variability and uncertainty.

ABSTRACT For designing a high performance electric vehicle capable to run a quarter of a mile in 10 seconds, it is necessary to use ultracapacitors because they have high power density and their shelf life is longer than other conventional storage elements. These elements will feed four PM motor with a higher voltage requirement, so it is important to increase the power density of the DC-DC converter which interfaces the ultracapacitors with the motor drivers. In these conditions, a novel high power DC-DC converter is studied looking for a high efficiency with a small size. This work shows the design of a high power density interleaved DC-DC converter using closed-coupled inductors and the development of a prototype.

The radiation behaviour of motherboard-subboard structures on printed-circuit boards is investigated. The analysis is based on an equivalent circuit including the connector inductance network and the radiating antenna structure. A special focus is put on the calculation of the mutual and self inductances of the connector pins. For this purpose simple closed-form expressions are developed for the central board region

In power system, every transmission line exhibits many electrical properties. Analytical method has been widely used in determination of the inductance and capacitance for various transmission line configurations. However, it not applicable in general especially for complicated conductor arrangements. Therefore, in this work, a magnetic flux-linkage finite element analysis (FEA) method has been proposed to calculate the inductance in various conductor arrangements in different transmission line configurations while the capacitance is calculated using electric potential FEA method.

pe.org.pl/articles/2012/10a/58.pdf

A critical component of the millimeter-wave superheterodyne receiver is the local oscillator (LO) which is used to pump the low-noise mixer. Frequency multipliers have been used for many years to produce LO power. Current technology uses the whisker-contacted Schottky varactor diode which is inherently very fragile, expensive to fabricate, difficult to optimize, and requires as many as three mechanical tuners. This report describes the design, fabrication, and evaluation of four planar frequency multipliers. The 'direct-replacement' design demonstrates how a discrete planar varactor can replace a whisker-contacted varactor in a waveguide-type 75/225 GHz tripler and yield comparable performance. The fully monolithic (MMIC) balanced-varactor 80/160 GHz doubler and balanced-varactor 80/240 GHz tripler designs illustrate that MMIC technology is practical throughout the millimeter-wave band. Finally, a high-power 31/94 GHz tripler design is presented. These MMIC multipliers are t...

IEC 62305-4 gives the rules for the selection and the installation of surge protective devices (SPDs), where the maximum enhancement factor is considered to be equal to 2 in the worst case of open-circuit condition. The objective of the present paper is to check this relation for equipment connected to low-voltage (LV) power system. The LV power system is considered as TN-S system with different routings in three- and six-storey buildings. The terminals of apparatus are substituted by a variety of different loads, namely, resistances, inductances, and capacitances. All Maxwell's equations are solved by the method of moments (MoM) and the voltage is calculated at the apparatus terminals. The SPD itself is simulated by a voltage source at the ground floor. The results reveal that the voltage at the apparatus terminals may overshoot the SPD protection level by a factor of 3 irrespective of the number of floors and loops. Copyright © 2008 John Wiley & Sons, Ltd.

A Superconducting Magnetic Energy Storage System (SMES) consists of a high inductance coil emulating a constant current source. Such a SMES system, when connected to a power system, is able to inject/absorb active and reactive power into or from a system. The active power injected into the system is controlled by varying the duty cycle of the switches in the dc-dc chopper while the SMES coil is discharging into the system. The reactive power is controlled by the magnitude of the converter output voltage. The storage setup is tested on a WSCC 3 machine 9 bus system. The behavior of the system is tested for a three phase fault on the network at different locations. The transient behavior of the system is observed with and without the SMES unit. The SMES unit is able to damp out the post-fault oscillations within a short time.