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By Topic

Industrial Electronics, IEEE Transactions on

Issue 1 • Date Feb 1991

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Displaying Results 1 - 16 of 16
  • An EPROM-based PWM modulator for a three-phase soft commutated inverter

    Publication Year: 1991 , Page(s): 79 - 81
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    A fully digital erasable programmable ROM (EPROM)-based pulse width modulator (PWM) that receives voltage and frequency control commands independently at the input and could be used in AC variable-speed drives is described. This modulator is simpler and dynamically better than one built using a microcomputer. A high-1 resolution (one in 256) is obtained, and up to eight different PWM switching strategies can be easily implemented. Changes in the voltage or frequency commands are transient free. Some experimental results are presented View full abstract»

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  • Robust recursive instrumental variable method with modified weights for bilinear system identification

    Publication Year: 1991 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    Based on P.J. Huber's minimax principle (1981), both symmetric and nonsymmetric robust recursive instrumental variable methods with modified weights are developed for bilinear system identification. A novel approach is used to prove a general convergence theorem for the proposed robust methods. The robustness and convergence of the proposed approaches are demonstrated by comparison with the corresponding nonrobust approaches in two simulation examples. It is shown that the suggested methods are far superior to the nonrobust ones View full abstract»

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  • Interrupt-driven microprocessor-based overcurrent relay

    Publication Year: 1991 , Page(s): 8 - 9
    Cited by:  Papers (6)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (156 KB)  

    An interrupt-driven overcurrent relay for power systems using the 8085 microprocessor is presented. The relay requests processing time from the microprocessor only when a fault occurs. In this way, the microprocessor is given the opportunity to run other tasks such as diagnostic tests online during normal conditions View full abstract»

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  • Real-time implementation and evaluation of dynamic control algorithms for industrial manipulators

    Publication Year: 1991 , Page(s): 26 - 31
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    The authors explore the real-time implementation of various dynamic control algorithms, which use different levels of information of the dynamics of a robot system, to show the feasibility and effectiveness of such algorithms. For this purpose, the dynamic equations of a robot manipulator based on Lagrange mechanisms are derived, converted to the equivalent dynamics with respect to the actuator, and added to the actuator dynamics. Hysteresis current controllers are used as the torque-type controller. Experimental results indicate that the computed torque and iterative learning control methods perform better than classical proportional-integral-derivative (PID) control and that these algorithms can be effectively applied to controlling industrial manipulators View full abstract»

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  • The control of switching DC-DC converters-a general LWR problem

    Publication Year: 1991 , Page(s): 65 - 71
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    The control of switching DC-DC converters is reviewed. It is regarded as a general linear quadratic regulator (LQR) problem, and an innovative optimal and robust digital controller is proposed. The control strategy adopted can achieve good regulation, rejection of modest disturbances, and the ability to cater to switching converters with RHP zeros. This controller design is a general approach that is applicable to all PWM-type DC-DC converters with their circuit topologies known or unknown. Modern CAD techniques are used to reach the final control law. Application to a published Cuk converter is used as an example, and the performance is evaluated View full abstract»

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  • Robust independent joint controller design for industrial robot manipulators

    Publication Year: 1991 , Page(s): 21 - 25
    Cited by:  Papers (40)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    A novel approach is presented for the design of simple robust independent joint controllers for industrial robot manipulators. In this approach, each joint actuator is treated as a simple inertial system plus a disturbance torque representing all the unmodeled dynamics. By a very simple algorithm, the disturbance is instantly estimated and rejected, thus allowing a simple proportional-derivative (PD) control scheme to be used. The stability of the proposed control law is analyzed. Experimental evaluations of the controller on a microcomputer-controlled PUMA 560 arm were performed. It is shown that the control scheme is simple and practical and that it can be easily implemented on an industrial manipulator presently in use View full abstract»

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  • A 20 b dynamic-range floating-point data acquisition system

    Publication Year: 1991 , Page(s): 10 - 14
    Cited by:  Papers (8)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    The design and engineering of a floating-point data-acquisition system are described. The system has both automatic gain and software-programmable gain adjustment features. In automatic gain adjustment mode, the gain is set automatically dependent on the input amplitude so that the full conversion resolution is maintained irrespective of the signal dynamic range. A high-speed flash ADC with an approximately 35 ns conversion time is used to convert the signal quickly into 8 b data. A programmable array logic (PAL) then transfers this 8 b digital data into 12 b information for setting the gain of the variable-gain amplifier. The amplifier gain settings are all powers of two; thus, the normalization of the digitized data requires only a bit shifting operation and no complex software division. The gain information and the 12 b sampling ADC output increase the dynamic range to 20 b. The software package includes commands needed for the system initiation, automatic gain or software programmable gain selection, sampling and conversion, and data normalization View full abstract»

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  • A discrete time domain modeling and analysis of controlled series resonant converter

    Publication Year: 1991 , Page(s): 32 - 40
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB)  

    A discrete time domain modeling and analysis technique applicable to all types of inner-feedback and noninner-feedback-controlled series resonant converter (SRC) is presented. The nonlinear discrete time domain equations representing the static and dynamic behavior of the SRC are derived and linearized about the equilibrium state of the SRC. In addition, the inner-feedback control law is linearized about the equilibrium state. The linearized SRC and the linearized inner-feedback control law are then combined to arrive at a linearized inner-feedback-controlled SRC. The linearized modeling is used to analyze the stability and dynamic characteristics of the controlled SRC View full abstract»

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  • A novel active current waveshaping technique for solid-state input power factor conditioners

    Publication Year: 1991 , Page(s): 72 - 78
    Cited by:  Papers (98)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (492 KB)  

    A novel input power factor correction method that uses a closed-loop active current waveshaping technique is presented. The novel feature of the method is that nearly sinusoidal input currents are obtained at constant switching frequencies. Moreover, the method exhibits instantaneous current control, which results in very fast response and increased switch reliability. Selected predicted system performance and design methods were verified experimentally on a 1 kVA laboratory prototype View full abstract»

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  • Biphase amplifier for precision controlled rectification and polar logic operations

    Publication Year: 1991 , Page(s): 62 - 64
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    A biphase amplifier is a positive-negative controlled unity gain amplifier. Its circuit is simple but very useful in the fields of control, instrumentation, and communications. The use of a biphase amplifier for some novel applications, e.g. polar logic operations and precision controlled rectifications, is described. The circuits described were experimentally tested and found to be quite satisfactory View full abstract»

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  • Position control system of a two degree of freedom manipulator with a passive joint

    Publication Year: 1991 , Page(s): 15 - 20
    Cited by:  Papers (17)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    A method is proposed for controlling the position of a manipulator with passive joints that have holding brakes instead of actuators. In this method, the coupling characteristics of manipulator dynamics are used, and no additional mechanisms are required. The effectiveness of the method was verified by experiments using a prototype manipulator. The prototype is a two-degree-of-freedom, horizontally articulated manipulator. The first axis is an active joint, and the second axis is a passive joint. While the brake of the passive joint is released, the passive joint is indirectly controlled by the motion of the active joint through the use of dynamic coupling. While the brake is engaged, the active joint is controlled. By combining these two control modes, the total position of the manipulator is controlled. The experiments show that use of this method makes the precise positioning of the passive joints possible View full abstract»

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  • Voltage modulation factor of the magnetic flux control PWM method for inverter

    Publication Year: 1991 , Page(s): 57 - 61
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    The voltage modulation factor of the magnetic flux control pulse-width modulation (PWM) method is discussed. The modulation factor is derived from a theoretical study on the flux locus produced from the inverter output voltage. The derivation is based on the fact that the fundamental component of the inverter output voltage is proportional to the radius of the flux locus. It is shown theoretically that the voltage modulation factor is expressed by the content of a zero vector in one cycle of the selected PWM pattern of the space vector expression. The modulation factor of the magnetic flux control PWM method is calculated. The modulation factor can be varied from zero to 12/π2. The output voltage of the magnetic flux control PWM method can be controlled by the modulation factor linearly from zero up to overmodulation. The simulation and experimental results are also shown View full abstract»

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  • The infeasibility of constant output power in a constant-current-fed class-E power inverter

    Publication Year: 1991 , Page(s): 81 - 82
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (148 KB)  

    The possibility of constant output power that is independent of load resistance is investigated. The only possibility is shown to be the trivial case in which the output power is zero. It is concluded that, for load-independent class-E operation, a different class-E inverter configuration, e.g. a class-E inverter with finite DC-feed inductance, may prove to be useful View full abstract»

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  • Design of a high-voltage GTO chopper for traction drive

    Publication Year: 1991 , Page(s): 51 - 56
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    A chopper operating at 4000 V and 800 A RMS using two large series-connected GTOs (4500 V, 2500 A) is designed. The series connection of GTOs is considered, including criteria for the selection of GTOs, design of snubbers, and adaption of GTO controls. The advantages and drawbacks of the strategies used are discussed. Detailed experimental results concerning the GTOs' commutations and the snubber circuits are presented. The influence of important parameters, such as the load current on the transient voltage distribution on the GTOs is discussed. Because series connection of GTOs is liable to be used in the high-voltage converters of rail traction systems, two industrial realizations are proposed View full abstract»

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  • A novel vector control scheme for transistor PWM inverter-fed induction motor drive

    Publication Year: 1991 , Page(s): 41 - 47
    Cited by:  Papers (46)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    A novel vector control scheme for a transistor pulse-width-modulation (PWM)-inverter-fed induction motor drive is presented. The system is based on a current control loop that consists of two independent nonlinear controllers that regulate the DC (field-oriented) components of the stator current vector. Three-level hysteresis comparators are used as current controllers. The outputs of the comparators select the appropriate inverter output voltage vectors via a switching erasable programmable ROM (EPROM) table. The theoretical principle of this method is discussed. Simulation and experimental results that illustrate the operation of the proposed system and performance in comparison with the other known schemes based on two-level hysteresis comparators are presented View full abstract»

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  • Current controller design for an electromagnetic actuator using an online parameter optimization approach

    Publication Year: 1991 , Page(s): 48 - 50
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    The design is presented of a digital proportional-plus-integral current controller for a nonlinear electromagnetic actuator using an online parameter optimization approach. The minimization algorithm of J.A. Nelder and R. Mead (1965) is used to calculate the proportional and integral controller gain such that a design objective function is minimized. At each iteration of the minimization procedure, the objective function is calculated by sampling the actual current and voltage signals of the actuator 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.

Full Aims & Scope

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