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Industrial Electronics Society, 1999. IECON '99 Proceedings. The 25th Annual Conference of the IEEE

Date Nov. 29 1999-Dec. 3 1999

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  • IECON'99 Proceedings [front matter]

    Page(s): 0_2 - xiv
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    Freely Available from IEEE
  • Author index

    Page(s): 1511 - 1517
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    Freely Available from IEEE
  • Dynamic model of interior permanent magnet motor with skewed stator slots

    Page(s): 1471 - 1476 vol.3
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    Realistic predictions of the dynamic and steady state performances are important in motor drive system design. This paper discusses a dynamic modeling method applied to the interior permanent magnet (IPM) motor with skewed stator slots by integrating two-dimensional electromagnetic field solutions with the electric circuit model. A multi-segment technique was applied to model the skew effect. Phenomena such as saturation and rotor saliency are taken into considerations in the suggested modeling method. The IPM motor performance characteristics under various operating conditions are investigated. Particular attention is paid to the motor torque, speed and induced back EMF responses. Experimental and simulation results of the motor model are presented View full abstract»

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  • Speed control of induction motors using a novel fuzzy-sliding mode structure

    Page(s): 1073 - 1078 vol.3
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    This paper presents a new approach to indirect vector control of induction motor. Two nonlinear controllers, one sliding mode and the other PI-fuzzy logic based, define a new control structure. Both controllers are combined by means of an expert system based on Tanaka and Sugeno fuzzy reasoning. The sliding mode controller acts mainly in the transient state while the PI-like fuzzy controller acts in the steady state. The new structure is assumed to embody the control advantages that both nonlinear controllers offer: sliding mode controllers present robustness, increasing system stability limits; and PI-like fuzzy logic based controllers have been used to improve steady state features, specially in nonlinear systems. The scheme has been implemented and experimentally validated View full abstract»

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  • Design and implementation for a novel matrix PMSM drive system

    Page(s): 1085 - 1090 vol.3
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    This paper proposes a new current-regulated switching strategy and a torque pulsation reduction method for a matrix converter PMSM drive system. The current-loop and speed-loop control algorithms of the drive system are implemented by a digital signal processor. By using this new switching strategy, the current harmonics of the system are effectively reduced. In addition, the speed can be adjusted as low as 1 r/min due to the torque pulsation reduction method. Several experimental results are shown to validate the theoretical analysis View full abstract»

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  • WWW-browser-based monitoring system for industrial plants

    Page(s): 1146 - 1151 vol.3
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    In this paper, the authors describe a WWW browser-based monitoring system (WBMS) for industrial plants. The WBMS is an integrated system connected with control LANs and an intranet. The authors show a system architecture based on an organizational security policy, and show some typical system requirements. They then describe two implementation approaches using Java technology, one is a graphical user interface (GUI) development and the other is about data acquisition and management at the client site. The authors also evaluate the performance of Java remote method invocation (RMI) and verify the efficiency of the technique which they propose. They also show how the WBMS can be extended to include a GIS and a simulator View full abstract»

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  • Total sliding mode trajectory control of robotic manipulators

    Page(s): 1062 - 1066 vol.3
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    This paper presents a new trajectory control scheme for robotic manipulators using a variable structure control with sliding mode. The proposed control method totally eliminates the reaching phase of the prior variable structure control methods, in which the robot trajectory is affected by the uncertainties and disturbances. Therefore, a total sliding motion of the robot dynamics is guaranteed, which provides the invariance property for the entire robot dynamics. In other words, the desired performance designed on the nominal parts of the robot model can be exactly assured, even though the robot system is subject to uncertainties and disturbances View full abstract»

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  • Characteristics of series-resonant AC link inverter for capacitor motor drives

    Page(s): 1386 - 1390 vol.3
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    This paper presents a control method for a series-resonant AC link inverter for capacitor motor drives and discusses its characteristics. This inverter is a type of resonant inverter using zero current switching (ZCS). Conventionally this inverter is controlled by pulse density modulation (PDM), but this generates the lower order harmonic components that do not arise with PWM inverters. To solve this problem, the authors have previously proposed solutions combining PDM and pulse amplitude modulation (PAM) controls. For resistance loads, they have demonstrated that this method can reduce the lower harmonic components and improve the waveform of the output current. In this paper, they present the basic characteristics and experimental results of this inverter for capacitor motor drives View full abstract»

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  • Machine-vision based detection for sheet metal industries

    Page(s): 1330 - 1335 vol.3
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    In this work, the authors present a machine-vision system (MVS) whose features are able to detect small protrusions (diameter around hundred μm) or peaks over external car parts, for the performance monitoring of steel sheet machining processes in the automotive industry. Trials made in this research prove the feasibility of implemented MVS based on two-dimensional imaging through a framegrabber. Also, algorithms for peaks detection are performed in a Pentium II PC, and developed by an object oriented programming tool called IMPULS VISION XXL SDK. The paper introduces the main fault for inspection over steel sheets devoted to external car parts. Relevant features for MVS are extracted from trials made in steel sheet machining shopfloor, called MVS and scanning ones. Algorithms for peaks detection are also presented. Results and new guidelines of this work are explained, as are conclusions and future works View full abstract»

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  • A new hybrid C-dump and buck-fronted converter for switched reluctance motors

    Page(s): 1109 - 1114 vol.3
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    This paper proposes a single pulse operation SRM converter topology based on the basic buck-fronted topology and the modified C-dump topology. Using only (n+1) power switches, this topology can achieve full single pulse operation, thereby reducing switching losses and acoustic noise. It also achieves a greater de-magnetizing voltage compared to the basic buck-fronted topology, without having to increase the DC source voltage. The converter is more robust as its dump capacitor stops being charged if the chopper switch fails. The principle of operation, modes of operation and transient simulation results are presented View full abstract»

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  • Vibration control of three-inertia system

    Page(s): 1045 - 1050 vol.3
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    The speed controls of a three-inertia system with conventional PI/PID controls are discussed, the analysis procedure based on the parameter plane method is presented. It is shown that the inertia distribution of the three-inertia system dominates the dynamic behavior. The integrated design of controller and structure is studied, and it is shown that the rational distribution among the three inertias is important to improvement of the dynamic characteristic and reduction of the controller's complexity. In this case, a simple PI control can provide good performance. Furthermore, PID control contributes the rational inertia distribution. The effectiveness is verified by experiment View full abstract»

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  • A fault tolerance analysis of Profibus systems by means of generalised stochastic Petri nets

    Page(s): 1210 - 1215 vol.3
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    This paper analyses a well-known field bus system, the Profibus, as a gracefully degrading system. A two-phase analysis is performed, which takes into account permanent and temporary faults separately, and the consequences of a particular type of faults, called malicious, are also investigated. Finally a study of Profibus fault tolerance, based on a Petri net model, is presented View full abstract»

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  • Model-based diagnosis of chaotic vibration signals

    Page(s): 1177 - 1180 vol.3
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    This paper presents a model-based approach to online monitoring and fault diagnosis of rotating machinery. Fault (e.g., rub, imbalance) modes of rotating machines are classified using nonlinear dynamic models with quasi-periodic and chaotic behavior. The paper identifies a class of fault scenario under which the well-accepted nonlinear state filters (e.g., EKF) cannot be used to monitor or diagnose the machinery. An effective on-line model-based monitoring and diagnosis algorithm is proposed. The algorithm is based on computationally efficient algorithms for signal processing and parameter identification View full abstract»

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  • Reduced-order control of permanent magnet synchronous motors

    Page(s): 1361 - 1366 vol.3
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    This study presents simple and effective high performance tracking controllers for permanent magnet synchronous motors (PMSM). A reduced-order model is derived from the singular perturbation analysis of the PMSM model by taking advantage of the two-time-scale property of small electrical machines. Controller designs based on this reduced model are simple and do not need to measure the current signals for feedback purposes because the model applies a set of second-order nonlinear dynamic equations that contain only mechanical variables. The steady-state current response can still be controlled indirectly to achieve near-minimum power dissipation, even though current signals are not measured. Moreover, the stability of the reduced system, as well as that of the original full system under control, is also studied herein. Experimental results demonstrate that the controllers developed in this study are capable of achieving high performance position and velocity tracking control View full abstract»

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  • A novel switched reluctance motor drive with optical graphical programming technology

    Page(s): 1121 - 1126 vol.3
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    Due to its magnetic nonlinearities, SRM drive control is complicated and normally requires a microprocessor or a DSP. This paper presents a simple and reliable SRM drive using an innovative encoder based on optical graphical programming technology. There is no microprocessor in the drive, no A/D or D/A circuitry, with a drive system that matches the simplicity of the motor construction. It features a simple and effective control capability. Current waveform optimization for the encoder is carried out offline, for high efficiency and programmed directly into the encoder. Experimental results validate the concept View full abstract»

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  • Rapid resin mold with embedded thin film pressure/temperature sensors

    Page(s): 1301 - 1306 vol.3
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    In this paper we have developed a new approach by embedding sensors into rapid resin mold's core and cavity for directly measuring the pressure and temperature information for the purpose of improving the injection molding process. Using the information collected by embedded piezoelectric sensors, we can develop an on-line, close-loop control system to ensure the quality of products. We have simulated the system with time versus temperature for different mold materials View full abstract»

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  • Visual tracking using adaptive color histogram model

    Page(s): 1336 - 1341 vol.3
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    Color provides a useful cue for image analysis and object recognition in robotics and automation applications. In most color based target recognition systems, the color models are invariant in a-priori and are never adjusted while the illumination condition changed. In this case, the system recognition is prone to error due to the change of surrounding illumination. To solve this problem, we have proposed a modeling method with high-tolerance based on probability distribution. The model is adaptive based on the change of illumination condition through on-line adjustment of the model parameters. We called this vision system an adaptive color vision system (ACVS). In this paper, we describe this ACVS system in detail and demonstrate it through the application of the histogram backprojection algorithm. We have conducted experiments which demonstrate the color object tracking by ACVS in a natural environment is an adaptive robustness and flexible system View full abstract»

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  • Monitoring and control using the Internet and Java

    Page(s): 1152 - 1158 vol.3
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    Manufacturers have long wished for a tool that would permit remote monitoring and control of manufacturing operations. The combination of the Java programming language with the worldwide reach of the Internet now promises a solution to this problem. Java's scalability, portability, and platform independence allow remote monitoring and control applications (“applets”) to run on any web browser. Java applets eliminate the need to build custom hardware/software when implementing remote monitoring and control systems. Any browser can be configured to display graphical representations of the plant or process and to annotate the image with real time data; thus, any Internet-enabled computer is a potential control station (assuming security concerns are satisfied). This gives rise to the concept of “virtual engineers” or “remote engineers” who, armed with real-time plant information, can optimize machine setting or process control parameters, and troubleshoot problems before they escalate View full abstract»

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  • Load analysis of packet switched networks in control systems

    Page(s): 1222 - 1227 vol.3
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    Analysis and design of switched networks in control systems often comes in close connection with the load analysis problem. Given the volume and pattern of traffic among the network end nodes, the problem can be defined as computing the amount of traffic or load on the network internal nodes, corresponding to network switch devices. We discuss a systematic solution to this problem using the graph model of the network coupled with a compact representation of the network traffic in the form of a traffic matrix. In particular, we present an iterative solution for a special class of switched networks, namely, networks with free topology. Beginning with the graph model and the traffic matrix of the original network, the loads on end nodes of the network are computed through simple matrix operations. The graph model is then trimmed by removing a group of end nodes and an equivalent traffic matrix is computed for the new graph. The procedure is repeated until the network is reduced to a single node, which typically happens to be the backbone switch of the network View full abstract»

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  • Torque ripple minimization with indirect position and speed sensing for switched reluctance motors

    Page(s): 1127 - 1132 vol.3
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    A torque ripple minimization controller is realized simultaneously with indirect position and speed sensing for switched reluctance motors. The position and speed estimations are derived from a sliding mode observer that requires only terminal measurements of phase voltages and currents. The research shows that position and speed sensorless observers can be reliably used for the sophisticated control of SRMs. Experimental results using an 8/6, four-phase motor and the TMS320 C30 DSP are presented for demonstration of position and speed sensorless closed-loop operation of a torque ripple minimized SRM drive View full abstract»

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  • Voltage switching tables for DTC controlled interior permanent magnet motor

    Page(s): 1445 - 1451 vol.3
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    This paper compares two voltage-vector switching tables for direct torque controlled (DTC) interior permanent magnet (IPM) motors. The conventional eight voltage-vector switching table which is normally used in the DTC of induction motors does not seem to regulate the torque and stator flux in an IPM motor well when the motor operates at low speed. Modelling and experimental studies have both revealed that a six voltage-vector switching table is more appropriate for an IPM motor drive at low speed. This paper reports the results of a modelling and experimental study of the two voltage switching tables for the DTC of the IPM motor, for operation at low and at high speeds View full abstract»

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  • Active filtering of low frequency harmonics in DC/DC converters for traction applications

    Page(s): 1421 - 1426 vol.3
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    The line-side DC/DC converter used for ETR500P traction train by ANSALDO Trasporti SpA (Italy) is considered. A new active filtering technique is proposed in order to compensate for undesired input current harmonics. The compensation technique does not require any additional power converter and it is based on an on-line detection of the undesired harmonic to be eliminated. The controller is designed by using an equivalent circuit of the DC/DC converter, obtained by means of a proper transformation of its state space model. Simulation results show the effectiveness of the proposed technique View full abstract»

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  • Comparison of torque responses of the interior permanent magnet motor under PWM current and direct torque controls

    Page(s): 1464 - 1470 vol.3
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    This paper compares the conventional CRPWM torque control scheme (in the rotor reference frame) for interior PM synchronous motor drives with the direct torque control scheme which operates in the stator reference frame. The direct torque control scheme, controls the stator flux vector directly in the stator reference frame as a means to control torque. It has several advantages such as elimination of the mandatory rotor position sensor, stator to rotor transformation and closed-loop PWM current controller networks/software. The elimination of certain hardware/software and of the inevitable delays inherent in these networks potentially results in a much faster dynamic torque response than that which is obtained with PWM current control. This paper examines the response times of torque for the two schemes through analysis, modelling and experimental studies, and compares the two strategies of torque control View full abstract»

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  • DSP-based sensorless position estimation in switched reluctance drives

    Page(s): 1133 - 1138 vol.3
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    Information on rotor position is essential for controlling the operation of switched reluctance motors (SRMs). Conventional SRM drives utilize optical or electromagnetic rotor position sensors which provide a rotor position reference signal while the rotor is in operation. The fitting of a rotor position transducer on an SRM requires additional electrical connections, additional cost and a potential source of unreliability. Considerable attention has recently been applied to various methods for sensorless rotor position measurement, generally based on measurement of phase current and flux and a preknowledge of the magnetic characteristics. This paper presents two methods which deduce sensorless rotor position information by monitoring the excitation signals of the motor phases whilst the inductance is rising. This is done without the injection of diagnostic current pulses and has the advantages that the measured current is large and mutual effects from other phases are negligible View full abstract»

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  • Design of a new clock recovery ADPLL for disk drives

    Page(s): 1204 - 1209 vol.3
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    In this paper, a new all-digital type clock recovery phase locked loop (CRPLL) for disk drives is proposed. The proposed CRPLL can provide both large lock-in range and good tracking performance by estimating the frequency offset and the phase error. Furthermore, it does not suffer severely from the phase jitter due to the quantization effect of the numerically controlled oscillator (NCO). Various simulation and experimental results as well as some mathematical performance analysis are presented to demonstrate the practical use and the excellent performance of the proposed CRPLL over the conventional ones View full abstract»

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