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Industrial Electronics, Control, Instrumentation, and Automation, 1992. Power Electronics and Motion Control., Proceedings of the 1992 International Conference on

Date 13-13 Nov. 1992

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  • Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation, and Automation. Power Electronics and Motion Control (Cat. No.92CH3137-7)

    Publication Year: 1992
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    Freely Available from IEEE
  • Development of high speed solenoid valve-investigation of the energizing circuits

    Publication Year: 1992 , Page(s): 564 - 569 vol.1
    Cited by:  Patents (1)
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    The authors discuss electrical circuits they have developed for the purpose of energizing the solenoid valve. These circuits are named the dummy coil method, where energy stored in a dummy coil in the form of a magnetic field is transferred to the energizing solenoid, and the pre-energize method, where the solenoid is electrically energized in advance by taking advantages of the solenoid's attraction force characteristics. Experimental results have shown that the pre-energize method is highly effective in speeding up the operation of solenoid valves. These experimental results are discussed along with results of calculation that have been conducted using a mathematical model developed by the authors View full abstract»

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  • Getting more from fluorescent lamps through resonant converters

    Publication Year: 1992 , Page(s): 560 - 563 vol.1
    Cited by:  Papers (8)  |  Patents (5)
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    It is pointed out that high-frequency resonant power converters make it possible to exploit tabular fluorescent lamps without electrodes. The authors outline a simple approach that puts this situation into perspective in the case of capacitively coupled lamps. A Class-E inverter which is suitable for the electrodeless operation is also described. Experimental results from a 16 W converter breadboard with the proposed circuit topology using 2.65 MHz and 13.56 MHz switching frequencies are discussed View full abstract»

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  • Slow speed control system with linear voltage drive for brushless DC motor

    Publication Year: 1992 , Page(s): 419 - 424 vol.1
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    The authors consider a stable slow-speed drive and high-precision positioning mechanism, applying a linear voltage drive to the brushless DC motor. To compare the performance of the linear voltage drive and switch drive, the brushless DC motor and two driving circuits have been modeled, and computer simulations have been performed by using MATRIXx. The validity of the slow-speed brushless DC motor control system was also proved by experiment. According to the experimental results, a rotational speed fluctuation can be obtained within 1%, where the rotational speed is 2 rad/sec and the given load is 0.3 N-m. It was verified that the performance of the positioning mechanism is sufficiently precise by testing the response to a step load View full abstract»

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  • Parameterization of unit-pulse response model

    Publication Year: 1992 , Page(s): 1427 - 1430 vol.3
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    A parameterization of the unit-pulse response model using the eigenvectors of the autocorrelation matrix of the input is proposed. It is shown that the parameters of the parameterized model are directly related to the frequency characteristics. This model makes it possible to develop effective identification algorithms in the time domain, considering the estimation accuracy in the frequency domain. In practice, on the basis of this model, the authors have proposed a modified least-square estimation which is more robust than the ordinary least-square estimation against observation noise View full abstract»

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  • A method for adding counter-places to the incidence matrix of Petri net

    Publication Year: 1992 , Page(s): 1422 - 1426 vol.3
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    It is shown that there are two problems that must be solved when applying a Petri net to an actual case of a sequential control system. The first one is how to divide a large-sized reachability problem into small-size problems that can be solved in a feasible computation time with a computer having a reasonable memory storage capacity. The second problem is how many counter-places would be added and at what positions they should be added. The authors propose a method to divide a Petri net by using the property of place invariants, and add counter-places based on algebraic techniques. An example is given that shows the effectiveness of the approach presented View full abstract»

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  • Hypercube architecture for Newton-Euler dynamics of multiple linked robot

    Publication Year: 1992 , Page(s): 650 - 655 vol.2
    Cited by:  Papers (1)
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    The author presents a hypercube parallel algorithm for recursive Newton-Euler dynamics of the multiple linked robot. The relationship between the minimum hypercube dimension and the number of linked arms of the robot is also studied. This result is derived from a rule of internode transmission for hypercube parallel processing of the inverse dynamics View full abstract»

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  • Grinding sculptured surfaces with industrial robots

    Publication Year: 1992 , Page(s): 940 - 945 vol.2
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    Following basic technological tests on conventional grinding systems, a belt grinder suitable for robots has been developed, and a prototype has been integrated into a grinding cell. Its machine functions are coupled to the robot controller so that, unlike normal systems, the grinding cell permits problem-specific programming. The overall grinding cell can be efficiently programmed, i.e., without taking up the machine's valuable production time, as early as the planning stage with the aid of a simulation and programming system. To optimize the grinding program a programming system has been developed and connected to a low-cost CAD system. The benefits of the low-cost programming system are summarized View full abstract»

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  • Some design aspects of fully and partially regenerative active snubber networks

    Publication Year: 1992 , Page(s): 330 - 335 vol.1
    Cited by:  Papers (4)
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    Analytical expressions predicting the energy trapped in snubber network components are developed. These expressions are then used to evaluate the effectiveness of frequently used low-loss snubber networks under full and partial energy recovering conditions. Results show that the additional complexity of a fully regenerative active snubber is not always justified. Depending upon specific operating conditions and snubber component size, zones of yes, no, and maybe exist. The validity of predicted results have been verified on a 30 kVA GTO (gate turn-off thyristor) experimental inverter View full abstract»

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  • Modeling and implementation of a smart current sensor

    Publication Year: 1992 , Page(s): 1550 - 1555 vol.3
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    The modeling and implementation of a high-performance current sensor are presented. In order to improve the dynamic response in the following primary current and frequency bandwidth, a measurement system with feedback based on the principle of zero magnetic field detection is proposed. The system model is estimated by introducing two current components sensed by a Hall device and induced by the magnetic core, respectively. The performance of the proposed measurement system is confirmed by simulations, the implementation of the current sensor is carried out, and analyses of the effects of key elements on system performance are performed. The simulation and experimental results indicate that good following performances are achieved in the frequency range from DC to above 100 kHz. In addition, the proposed current sensors have been successfully applied in servo control systems and process control systems that need to accurately detect transient current signals with a wide frequency range View full abstract»

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  • Implementation of speed-sensor-less field-oriented vector control using adaptive sliding observers

    Publication Year: 1992 , Page(s): 453 - 458 vol.1
    Cited by:  Papers (15)
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    The authors describe the design method for a robust adaptive sliding observer which realizes speed-sensorless field-oriented vector control of AC motor drives. The speed-sensorless field oriented vector control system using the adaptive sliding observer was implemented. The basic characteristics of the proposed system and the design method against parameter deviation were studied experimentally. In the present system, the steady state error of the speed control was about 0.3% and the settling time was about 100 ms. The proposed system had good characteristics of speed control even in a low-speed region. The pole assignment, considering H norm of the transfer function from disturbances, realized good characteristics of the speed-sensorless field-oriented vector control even with parameter deviations View full abstract»

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  • Automatic control system of billet reheating rotary hearth furnace

    Publication Year: 1992 , Page(s): 1417 - 1421 vol.3
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    A novel automatic control system for a billet reheating rotary hearth furnace has been developed. The control system consists of a component that calculates the billet temperature and a component that calculates the optimal furnace temperature set-point. This system has been applied to the rotary hearth furnace of the medium-size seamless tube mill at Sumitomo Metals' Wakayama Steel Works, has achieved energy savings of 5000 Kcal/ton in billet heating, and has also satisfactorily maintained the extracted billet temperature within the required temperature tolerance View full abstract»

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  • A comparison of control strategies of robotic manipulators using neural networks

    Publication Year: 1992 , Page(s): 688 - 693 vol.2
    Cited by:  Papers (3)
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    The authors present a comparison of control strategies for robotic manipulators based on artificial neural networks. Two position control strategies of a two-degree-of-freedom (DOF) SCARA manipulator are investigated: the direct inverse neurocontroller and the nonlinear neural compensator. The performances of the two strategies are compared in terms of error convergence and adaptation to parameter variation. Satisfactory simulation results of position control for the SCARA manipulator by using neurocontrollers are presented View full abstract»

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  • Flexible planetary gear drives in robotics

    Publication Year: 1992 , Page(s): 646 - 649 vol.2
    Cited by:  Papers (4)
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    A method of modeling and computation of industrial robots with rigid-link flexible joints actuated by flexible planetary gear drives is presented. Joint flexibility, as a predominant source of resource, often results in inaccurate tracking of prescribed robot trajectories. The authors consider an n-link industrial robot modeled by rigid-body linkage members interconnected by flexible joints, actuated by DC servomotors and a flexible planetary gear system. The single-link joint model with one flexible planetary gear unit has six degrees of freedom (DOFs). In the gears the periodical time-dependent tooth stiffness represents an essential excitation source and was incorporated into a dynamic model of a robot system. The dynamic model of the robot with flexible joints for the case of elastic planetary gear is presented on example of the SCARA robot's basic configuration for two DOFs View full abstract»

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  • Edge finishing using hybrid position/force control of an XY table

    Publication Year: 1992 , Page(s): 934 - 939 vol.2
    Cited by:  Patents (1)
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    The authors describe the use of a direct-drive XY table in the automated edge finishing of machined parts. The table is faster and more accurate than an articulated robot, and where planar motion in a small work area is sufficient it is preferable. Hybrid position/force control is used to guide the table past the tool and maintain the contact force at the desired level. A six-axis force sensor on the tool spindle is used to measure contact force. A dynamic model is identified for the table from experimental measurements and this model is used to design a position/force controller for the table. An example application of the table in the deburring of an actual jet engine turbine hub is presented View full abstract»

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  • Cutting quality of kitchen knives: an application of sensor fusion to the analysis

    Publication Year: 1992 , Page(s): 1571 - 1576 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Regression analysis is examined as a data integration technique for sensor fusion. Using experimental design, the effect of each explanatory variable on response variables is obtained independently, and when interactions are expected to exist, the effects can be calculated. An experiment on the quantification of sensor characteristics measured by sensor evaluation was carried out. The cutting quality of kitchen knives was considered as an example of sensory characteristics. It was found that the most significant factors influencing cutting quality are the angle of the cutting edge and the roughness of the side surface of the cutting edge View full abstract»

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  • A three-phase active power filter operating with fixed switching frequency for reactive power and current harmonic compensation

    Publication Year: 1992 , Page(s): 362 - 367 vol.1
    Cited by:  Papers (8)
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    The performance and dynamic characteristics of a three-phase active power filter operating with fixed switching frequency are presented and analysed. The proposed scheme employs a pulse width modulation voltage source inverter and has two important characteristics. First, it operates with fixed switching frequency, and, second, it can compensate the reactive power and the current harmonic components of nonlinear loads. Reactive power compensation is achieved without sensing the computing the reactive component of the load current, thus simplifying the control system. Current harmonic compensation is done in the time domain. The principles of operation of the proposed active power filter along with the design criteria of the power and control circuit components are discussed in detail. Experimental results obtained from a 5 kVA prototype confirm the feasibility and the features of the proposed system View full abstract»

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  • Synchronization on the points of turn-off time of series-connected power semiconductor devices using Miller effect

    Publication Year: 1992 , Page(s): 325 - 329 vol.1
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (244 KB)  

    In order to improve the reliability and efficiency of high-voltage power converters using series-connected power transistors, a novel method for series connection of power transistors has been proposed, simulated, and studied experimentally. This method has the following advantage compared with conventional methods: the snubber losses and switching times can be reduced by minimizing the value of snubber capacitors: the number of connected devices is not limited; the method is unrelated to the sequence of turn-off; and the circuit is relatively simple. This novel switching algorithm for series connection is able to implement not only dynamic voltage balancing despite the difference of switching characteristics but also the minimization of the value of the snubber capacitor by the Miller effect View full abstract»

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  • Smart autopilots

    Publication Year: 1992 , Page(s): 1437 - 1442 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    A simulation comparison of autopilots based on proportional plus integral plus derivative (PID) and pseudoderivative feedback (PDF) algorithms showed the superiority of PDF autopilots over PID ones. An autopilot based on the PDF algorithm had a greater ability to resist load disturbances, which is important in course keeping. Smooth rudder activity and heading responses with smaller overshoots were observed with the PDF autopilot in the case of course changing. The effect of the order of ship dynamics and nonlinearity effects in the ship dynamics showed that better performance can be achieved with the PDF autopilot View full abstract»

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  • Diagnosis of machine scream-identification of standard number of bearings and diagnosis of the failure modes

    Publication Year: 1992 , Page(s): 1058 - 1063 vol.2
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    The authors describe a new acoustic method to identify standard numbers of ball bearings and diagnose their failure modes from the scream produced when they are rotating. They apply neural network techniques to the identification and diagnosis. An architecture for the hierarchically structured multilayer neural networks is presented. The tasks of identification of the numbers and diagnosis of the failure mode are allotted to each of the hierarchical stages. The network in the first stage directly receives a dB line scream spectrum and identifies the standard number of the ball bearing. A network in the second stage corresponding to the standard number identified in the first stage diagnoses the fault from the information on the repetitive frequency and stationarity or nonstationarity characteristics of the scream. The identification and diagnosis of bearings were carried out both by simulation and by experiments. It was found that the hierarchical neural network could effectively identify the standard number and diagnose the faults View full abstract»

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  • Calculating approach and implementation for active filters in unbalanced three-phase system using synchronous detection method

    Publication Year: 1992 , Page(s): 374 - 380 vol.1
    Cited by:  Papers (18)
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    The authors present calculation approaches for obtaining compensating components for a reactive and harmonic current compensator in unbalanced three-phase power systems. The synchronous detection method is applied to calculate proper compensating components by monitoring the line currents and voltages. The per-phase calculation algorithm is implemented to share and distribute the compensating power using approaches of equal power, equal current, and equal resistance. The proposed algorithm and the implementation circuit are presented with their test results. The merits of the proposed methods are the capabilities to operate under an unbalanced three-phase system by per-phase calculation, to avoid conversion error by force waveform calculation, and to implement the hardware in a simple manner. it can be widely used in active filter designs for current compensation and load balancing View full abstract»

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  • A design of auto-tuning PID controller using fuzzy logic

    Publication Year: 1992 , Page(s): 971 - 976 vol.2
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    The authors describe an autotuning method for an intelligent PID (proportional-integral-derivative) control system. This method is based on the settling time of the process and is applied to the autotuning PID controller by using fuzzy logic. The autotuning algorithm proposed can tune the PID parameters online using the response characteristics of the PID control system. The performance of the controller was verified by computer simulation. Simulation shows good results. The proposed controller was tuned automatically to the optimal PID parameters under various initial conditions View full abstract»

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  • A motion control algorithm for nonholonomic robots in dynamic environments

    Publication Year: 1992 , Page(s): 844 - 848 vol.2
    Cited by:  Papers (2)
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    A motion control algorithm for nonholonomic robots operating in an environment composed of fixed and moving obstacles has been developed. The algorithm is based on range measurements and does not have a priori information on the number, location, and characteristics of the objects. The algorithm is based on a method for estimating the position and velocity of moving obstacles and a scheme to detect collisions with them. A set of motion plans is constructed and, for each plan, the likelihood of a collision with moving objects is calculated. The robot moves in the direction that will avoid collisions. Several simulation examples are presented which show the performance of the algorithm View full abstract»

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  • Contact force control for 2 DOF, manipulators based on iterative learning operation

    Publication Year: 1992 , Page(s): 682 - 687 vol.2
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    T. Suzuki et al. (1992) previously proposed a contact force control method with a learning method for single degree-of-freedom manipulators. The learning control was based on an iterative operation, and was one of the feedforward controls which do not need precise values of the system parameters. The authors expand that learning method to a method for two-degree-of-freedom manipulators. Some problems exist in the case of learning for a normal and a tangential component of the approach velocity. Therefore, a new learning algorithm is presented keeping the ratio between a normal and a tangential component to a constant value. The relationship between the approach path and learning robustness is studied from the point of view of system control theory. It is clarified that an approach path exists which substantially degrades the learning robustness. Some simulation results to verify the effectiveness of the proposed method are presented View full abstract»

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  • Spherical 3-D holographic imaging system with an exact inverse problem solution

    Publication Year: 1992 , Page(s): 1319 - 1324 vol.3
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    The authors propose an image reconstruction algorithm with an exact inverse problem solution in a spherical 3-D holographic system. Experimental results obtained with a prototype of the holographic imaging system are discussed. This digital acoustical imaging system can obtain a complete set of the azimuthal data of the object field, and reconstruct fine images by using the exact inverse problem solution with feedback modification. A systolic array processor system can be used, and then real-time holographic image reconstruction becomes feasible View full abstract»

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