Equivalent Circuit Encompassing Electrical and Mechanical Parts of Direct Current Motors
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In this paper, a novel equivalent circuit of DC motors, which encompasses both electrical and mechanical parts, is presented. This equivalent circuit, which is more compact than the previously reported and requires only passive elements, allows for simulations of circuits containing DC motors to be carried out using SPICE program. Simulation and experimental results are shown to be in good agreement with theoretical calculation. The concept of this new equivalent circuit contributes to the understanding of DC motor operation using basic electrical circuit analysis.Keywords:
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Electrical element
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Thévenin's theorem
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In the last decade, there has been an outstanding improvement in the computer aided design tools for VLSI circuits regarding solution times and the circuit complexity. This study proposes formulating the acoustic field analysis problem using FEM, and employing the recent speed-up techniques used in the circuit simulators. In this work, total mass, stiffness and damping matrices are obtained using the FE approach, and piped into a computer program which generates an equivalent SPICE compatible circuit netlist. This approach makes it possible to use the most recent circuit simulation techniques to simulate the acoustical problems. The equivalent electrical circuit is a resistor-inductor-capacitor (RLC) circuit containing controlled sources to handle the couplings. The circuit matrices are 6 times larger but are sparser. We analyze these circuits with a general-purpose circuit simulation program, HSPICE, which provides high accuracy solutions in a short time. We also use an in-house developed circuit simulation program, MAWE, which makes use of asymptotic waveform evaluation (AWE) technique that has been successfully used in circuit simulation for solutions of large sets of equations. The results obtained on several problems, which are solved in time and frequency domains using circuit simulators and the FE analysis program ANSYS, match each other pretty well. Using circuit simulators instead of conventional method improves simulation speed without a significant loss of accuracy.
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Electrical element
RLC circuit
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RL circuit
Electronic circuit simulation
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The elementary theorems of circuit describe the essential character of circuit, so that they are important in analyzing a circuit. They not only reflect the physical significance, but also provide a effective method for the predigest of circuit as well as calculation.
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RL circuit
Electrical element
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In this article a new technique of process variation estimation in electrical circuit is presented. Technique is based on interval analysis application for a ladder circuit. Using this particular class of electrical circuit high speed of calculation could be achieved which is important in optimization and automated synthesis. In the article general ability of the technique application for a resistor circuit (with real impedance) is shown. Also ways of the technique extension for general circuit (with complex impedance) is discussed. Now the technique application is limited to passive network. The numerical experiments showed an agreement obtained results with statistical modeling with Monte Carlo Method. Further development of the technique is the extension to microwave circuit.
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Process Variation
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Within the Circuits and Systems (CAS) Society, developments in computer-aided circuit analysis and circuit design commenced in the early 1950's using the earliest digital computers. Initially, computer-aided circuit analysis of linear circuits was used in design optimization, design centering, and in determining the effects of parasitics on circuit performance. Although this use of computer-aided circuit analysis has continued, computer-aided design (CAD) and circuit design automation within the CAS Society are now principally concerned with problems associated with the overall design and evaluation of very large circuits and systems. This paper is a review of a major thread of CAD activity which has occurred within CAS from the earliest and remains of major interest. This thread involves computer-aided circuit analysis (circuit simulation) and its use in CAD systems. Fortunately, several excellent review papers have appeared within the past year or two to document well the technical milestones, as well as the problems of interest at the present time. It is possible then, in this paper, to concentrate on the developments in our present capability of circuit simulators, stressing the significant trends, noting some early developments which did not become major aspects, and observing the interchange between theory and practice.
Electronic design automation
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Design layout record
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Parasitic extraction
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This paper stresses the importance of applying circuit theory in circuit simulation. Circuit simulation is a combination of circuit theory and numerical analysis. Both the theoretical basis and the numerical algorithms should be robust and accurate to produce reliable and correct results. This communication focuses on the theoretical and practical aspects of circuit equation formulation in the simulation of circuits containing nanodevices.
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Electronic circuit simulation
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Typically star-delta transformation is adopted in determining the equivalent impedance between two terminals of an electrical network [2]. Shown relevantly in [1] is a simplified approach, less time-consuming to determine the equivalent resistance between two terminals of an electrical circuit made of resistive elements (of equal values) and, hence the resultant currents in the ciurcuit are determined. This concept is extended and generalized in this study to a class of networks with unequal resistances and/or reactances to determine the equivalent impedance between two nodes. This generalized approach is more comprehensive and universal in analyzing electrical network with complex impedances (regardless of their values). It is applicable to both contexts of circuits with pure resistive elements (as in d.c. analysis) as well as with complex impedances encountered in a.c. analysis.
Resistive touchscreen
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Linear resistance circuit analysis is the base of the circuit analysis.Involving the basic circuit theory and the applications of higher arithmetic ability,therefore it is a difficult part of the circuit knowledge.This article gives a computer-assisted analysis of circuit analysis methods combined with traditional circuit analysis form,to try to resolve this problem.
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Electrical element
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Electrical network
Electrical element
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Representation
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Shrinking device dimensions in integrated circuit technology made integrated circuits with millions of components a reality. As a result of this advance, electrical circuit simulators that can handle very large number of components have emerged. These programs use new circuit simulation techniques and can find solutions accurately and quickly. In this paper, we apply these techniques to structural mechanics problems by adopting electrical circuit equivalents. We first apply finite element formulation to the mechanical problem. The obtained sets of equations are treated as if they are sets of equations of an equivalent electrical circuit which consists of linear circuit elements such as capacitors, inductors and controlled sources. The equivalent circuit is obtained in the form of a circuit netlist and solved using a general purpose electrical circuit simulator. Several examples showing the advantages of the circuit simulation techniques are demonstrated. Asymptotic waveform evaluation technique which is widely used for simulation of large electrical circuits is also studied for the same examples and the speed-up advantage is shown. Copyright © 1999 John Wiley & Sons, Ltd.
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