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Industrial Electronics, IEEE Transactions on

Issue 5 • Date Oct 1995

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Displaying Results 1 - 19 of 19
  • Safe and time-optimized power transfer between two induction loads supplied by a single generator

    Page(s): 539 - 544
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    The paper deals with the problem of transferring power between different induction loads supplied by the same current generator, in as short a time as possible. In the reference solution, the system is completely stopped: it needs a long time for the current to reach zero and, afterwards, its new value, because the DC link inductance must be demagnetized and remagnetized; moreover an auxiliary starter is needed. In the proposed solution, the input of the current inverter is short-circuited whenever a transfer must be performed; the inductance remains magnetized and the current at the output of the inverter varies very quickly. The transfer time is minimal, and no starter is needed; the specific inverter control laws used to insure natural commutation are described. The paper also, presents control models of the system, obtained by using the first harmonic modeling method View full abstract»

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  • An improved cosine-mode controller for SCR converters

    Page(s): 552 - 554
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    An improved cosine-mode controller for silicon-controlled rectifier (SCR) power converters is presented. The proposed scheme linearizes the input/output transfer function of SCR power converters. The replacement of monostables by AND gates in the controller eliminates false turn-ons due to bouncing inside analog comparators. Experiments have been performed and satisfactory results are recorded View full abstract»

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  • A PSPICE model for the MOS controlled thyristor

    Page(s): 554 - 558
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    A PSPICE model for the MOS controlled thyristor (MCT), consisting of an SCR section and two MOSFET sections, is proposed. The parameters of the equivalent circuit are calculated from the data provided by the manufacturer and some simple measurements. The simulation and experimental results of a phase-controlled rectifier are compared View full abstract»

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  • Exponentially convergent rotor resistance estimation for induction motors

    Page(s): 508 - 515
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    A new estimation algorithm is presented which provides exponential estimation of rotor resistance for induction motor drives in physical operating conditions. The exponential convergence is not influenced by the value assumed by rotor speed, including zero speed. The algorithm also provides flux estimates and may be viewed as an adaptive observer. Experimental results show good performance with a sampling time of 0.8 ms which makes the algorithm implementable on-line by available digital signal processors View full abstract»

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  • Disturbance suppression control with review action of linear DC brushless motor

    Page(s): 494 - 500
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    This paper proposes a new preview and disturbance suppression control for a coreless type linear DC brushless motor (LDM). The brushless and coreless type linear DC motor is coggingless and has long life. It is suitable for high-speed operation and many precise positioning control purposes. However, it has disadvantages in that it is greatly affected by the parameter and load variation in the servo system with the LDM because it is not equipped with auxiliary mechanisms. The influence of the parameter variation and load change of the servo system are regarded as an equivalent disturbance signal and the compensation action is applied by utilizing the estimated value of the equivalent disturbance. The proposed control system is an optimal preview control system of type 1 comprising the estimation and compensating loop. In the proposed system, the disturbance suppression, improvement of phase delay of the whole control system, and lowering effect of the value of the input variables are attained in this control system for LDMs. Experimental studies for the LDM itself and a linear X-Y table made by the LDMs are shown and the above improvements are confirmed View full abstract»

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  • Dynamic model based auto-tuning digital servo driver

    Page(s): 462 - 466
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (884 KB)  

    This paper presents a new digital servo driver that realizes an auto-tuning function using a disturbance torque observer. By the auto-tuning function, a controller of the driver can obtain parameters for advanced controls. In the proposed driver, the controller is not a PI controller, but the model feedforward controller that is based on the dynamic equation of the plant. Then it is named a dynamic model based auto-tuning digital servo driver. The control parameters such as inertia constant, viscous coefficient, and constant disturbance torque, are automatically obtained by the orthogonal relation between torque components of the estimated disturbance torque. This auto-tuning algorithm is realized with a simple software for easy installation. The experimental results show that the auto-tuning digital servo driver can achieve good performances and that the driver is able to estimate all parameters accurately View full abstract»

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  • System design for cooperative control of a microactuator array

    Page(s): 449 - 454
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    A system design is presented with the aim of controlling many microactuators as autonomous distributed micromachines (ADMs). ADMs consist of many microcells which are smart enough to control their own motions and to cooperate with each other. A conveyance system in a plane is selected as an example of ADMs. We have developed a practical design of ADMs composed of many microcells integrated with actuators, sensors, and circuits which can be fabricated by IC-compatible micromachining. The behavior of the system is examined by simulation on a computer model. A fluidic microactuator array for a conveyor has also been fabricated and operated successfully View full abstract»

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  • Neural network control for DC motor micromaneuvering

    Page(s): 516 - 523
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (700 KB)  

    The application of a neural network controller for compensating the effects induced by the friction in a DC motor micromaneuvering system is considered in this article. A backpropagation neural network operating in the specialized learning mode, using the sign gradient descent algorithm, is employed. The input vector to the neural network controller consists of the time history of the motor angular shaft velocity within a prespecified time window. The on-line training of the neural network is performed in the region of interest of the output domain. The neural network output resembles that of a pulse width modulated controller. The effect of the number of neurons in the input and hidden layers on the transient system response is explored. Experimental studies are presented to indicate the effectiveness of the proposed algorithm View full abstract»

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  • Robust adaptive stick-slip friction compensation

    Page(s): 474 - 479
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB)  

    In this paper, a robust adaptive tracking control scheme is proposed for compensation of the stick-slip friction in a mechanical servo system. The control scheme has a sliding control input to compensate friction forces. The gain of the sliding control input is adjusted adaptively to estimate the linear bound of the stick-slip friction. By introducing the sliding control input, the global stability and the tracking error asymptotic convergence to the predetermined boundary are established via Lyapunov's stability theorem. The proposed scheme is shown to be robust to variations of the system and/or friction characteristics, and a bounded external disturbance. Computer simulations and experiments on an X-Y table verify the effectiveness of the proposed scheme View full abstract»

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  • A disturbance observer for robot manipulators with application to electronic components assembly

    Page(s): 487 - 493
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (644 KB)  

    The success of robotic assembly for odd form electronic components depends heavily on the ability to monitor and control the insertion force. For this purpose, a joint disturbance observer for robot manipulators is presented to estimate the reaction force due to component misinsertion. The derivation is presented in the time domain for a multi-degree-of-freedom manipulator without making the SISO linear system assumption. Based on the internal model control (IMC) concept, this observer is simple in structure. It is in the form of an integral controller and only requires measurements of joint position and velocity signals to be implemented. The observed perturbation signal includes the effects of model uncertainties as well as reaction force against the environment. Careful trajectory planning and detailed friction modeling are performed to enhance accuracy of the deduced reaction force. Experiments conducted on a SCARA robot for the insertion of PCB components demonstrated the performance of the proposed disturbance observer View full abstract»

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  • Performance improvement of optical actuator by double side irradiation

    Page(s): 455 - 461
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB)  

    This study is intended to improve the photoresponse of an optical actuator with a bimorph PLZT element. Known optical actuators have multiple merits for converting light energy to driving energy but have a slow response speed and large hysteresis. A method developed by us for exposing both sides of the bimorph element to light has been proved through a series of experiments that the response speed is increased and the hysteresis is reduced thus improving the photoresponse. More particularly, an optical servo system was fabricated for implementing the method and subjected to optical servo tests with PI control. As a result, the PI control was performed with much ease when both sides of the bimorph PLZT were irradiated indicating an advantage of the method View full abstract»

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  • Vibration absorption control of force-controlled manipulators on the basis of an equivalent spring model

    Page(s): 501 - 507
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (532 KB)  

    A simple model considering flexibility of constrained force-controlled manipulators is proposed by introducing a set of equivalent springs. On the basis of the proposed model we derive a controller, which compensates the vibrations of the responses of the contact force. For measuring the vibrations and the contact force, accelerometers and a force sensor are used, respectively. Output signals of the sensors are fed back to the driving motors for controlling the position of the end-effector and the contact force. The proposed controller is useful from the practical point of view, because there is no need to change the usual controllers and to construct complicated nonlinear observers. Experimental results are shown View full abstract»

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  • Iterative instrumental variable method for robust identification of systems

    Page(s): 480 - 486
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    A new off-line method, called the robust iterative instrumental variable method with modified residuals, is presented for robust identification of systems in this paper. It is based on Huber's minimax principle and the instrumental variable principle. Proof of convergence for the proposed method is given along with some results of simulation. Comparison with both nonrobust methods and robust methods proposed earlier shows that the proposed method provides better accuracy of estimate and speed of convergence View full abstract»

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  • The miniaturization technologies: past, present, and future

    Page(s): 423 - 430
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (852 KB)  

    Microelectromechanical systems (MEMS), micro systems technologies (MST, primarily in Europe) and micromanufacturing have become synonymous with the design, development, and manufacture of very small devices and systems. This paper overviews the history of the major technologies that are utilized in this field. After this brief historical overview of the technologies, a short description of MEMS technologies is presented. The status of the MEMS effort worldwide is reviewed with emphasis on the United States, Japan, and the European Community with particular emphasis placed on Germany, the Netherlands, and Switzerland. The future for the technology along with technology transfer and management is discussed from the standpoint of market pull. Bulk and surface micromachining of silicon, X-ray micromachining using the LIGA process, and the complementary processes such as laser and focused ion beam micromachining are reviewed View full abstract»

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  • Recent applications of polyimide to micromachining technology

    Page(s): 442 - 448
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    In this paper, applications of polyimide materials to micromachining technology are reviewed. First, the use of polyimide-based materials as sensor materials are discussed. In this case, the polyimide material is used as an integral part of the micromachined devices. Emphasis is given to the development and characterization of a piezoresistive composite of polyimide and graphite particles. The composite material is characterized for the mechanical properties (Young's modulus, residual stress) and the electromechanical property (piezoresistive coefficient). Second, the use of both photosensitive and nonphotosensitive polyimides as electroplating molds for the fabrication of thick and high aspect ratio metallic microstructures is presented. Extensions of the basic micromolding process, which enable the fabrication of controlled gaps between metallic microstructural components and higher aspect ratio microstructures, are presented. Electroplated metallic microstructures realized using these technologies are shown. In addition, various applications of the polyimide micromolding technologies are discussed View full abstract»

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  • The LIGA technique and its potential for microsystems-a survey

    Page(s): 431 - 441
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1172 KB)  

    The LIGA technique, which is being developed at the Research Center Karlsruhe, offers the possibility to manufacture microstructures with arbitrary lateral geometry, lateral dimensions down to below 1 μm and aspect ratios up to 500 from a variety of materials (metals, plastics, and ceramics). The basic steps of X-ray lithography, electroplating, and plastic molding, are briefly described. Examples of applications of the LIGA technique are: optical components (high performance microspectrometer), mechanical components (acceleration sensor with integrated temperature compensation), and fluidic components (micropumps) which are presented and discussed. Microcomponents will be of limited interest in the future if it will not be possible to integrate them into microsystems. Microsystems must be more powerful than the sum total of their components. This is discussed in the final chapter of this article View full abstract»

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  • Modeling parallel operating PWM DC/DC power supplies

    Page(s): 545 - 551
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    The control objective of a single operating PWM (pulse-width-modulated) DC/DC (direct current-to-direct current) power supply is to maintain the output voltage close to the reference. In the case of parallel operating power supplies, the control objective is enriched with the demand of keeping the power distribution between the units close to a specified pattern. The paper suggests a model for parallel operating DC/DC converters. The physical meaning of the parameters of the model are discussed. Finally, the paper suggests a structured model uncertainty description based on measurements, simulations, and “experience” View full abstract»

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  • A detailed R-L fed bridge converter model for power flow studies in industrial AC/DC power systems

    Page(s): 531 - 538
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    Because of lower voltage levels and smaller power ratings, the R/X ratio of commutation impedance in industrial AC/DC distribution systems is usually higher than that in HVDC transmission systems. Considerable discrepancies may therefore occur in industrial AC/DC power flow results, especially the reactive power consumption of converters, if the commutation resistances of the converters are neglected. To describe the effects of commutation impedance on converter operations and to precisely relate the fundamental line current and DC output current of the converter, a detailed model of the bridge converter with commutation impedance for use of Newton-Raphson power flow studies in industrial AC/DC power systems is derived in this paper. A coal mine power system and a DC electrified transit railway system with regenerative braking function, a part of Taipei Rapid Transit Systems under planning, have been analyzed to show the improved accuracy and good convergence characteristics of the developed Newton-Raphson power flow formulation with the proposed converter model View full abstract»

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  • Feasibility of both vector control and displacement factor correction by voltage source type AC-AC matrix converter

    Page(s): 524 - 530
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    This paper shows that by transforming both sides of the matrix converter to the d-q-o frames of their respective frequencies, there is significant simplification in the transformation matrix which enables the network of one side to be integrated to the other. Thus, it is possible to design for operation with field vector control on the motor side and unity displacement factor on the supply side. Laboratory experimental and digital simulation results are presented to substantiate the theory. The matrix converter used in the test is based on three modules of voltage-source SPWM converters to implement the nine switches and it has the innovative feature that the SVC voltages (for displacement factor improvement) can be derived from the zero-sequence voltages View full abstract»

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Aims & Scope

IEEE Transactions on Industrial Electronics encompasses the applications of electronics, controls and communications, instrumentation and computational intelligence for the enhancement of industrial and manufacturing systems and processes.

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Meet Our Editors

Editor-in-Chief
Carlo Cecati
DISIM - Univ. degli Studi dell'Aquila
67100 Aquila, Italy
c.cecati@ieee.org
Phone: +39 0862 434 450
Fax: +39 0862 1960 411