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IEEE Transactions on Industrial Electronics and Control Instrumentation

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  • RESOLVER IN DIGITAL CONTROL LOOP

    Publication Year: 1977, Page(s):145 - 149
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3775 KB)

    A digital control loop based on a resolver as feedback device is considered. This technique is popular in NC systems of machine tools. The control circuit transforms a train of pulses generated by a digital interpolator into a phase-modulated command signal and compares it with a phase-modulated feedback signal. The resulting phase-difference is the drive signal to the motor. The principle of the ... View full abstract»

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  • An Overview of Electric Motors for Space Applications

    Publication Year: 1981, Page(s):260 - 265
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2093 KB)

    Spacecrafts rely on electric motors for Important functions such as attitude control, deployment mechanisms, throttle valve control, etc. Electric motors for space applications must have long life and high reliability, under high vacuum, radiation, and wide operating temperature environments. Although various types of motors are available, all of them are not suitable. Limitations of ac synchronou... View full abstract»

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  • A Sample-Hold Circuit Using MOSFETs

    Publication Year: 1974, Page(s):262 - 263
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (366 KB)

    An analysis and design of a sample-hold circuit is presented and in addition, details of a working circuit. MOSFETs offer the possibility of a higher quality sample-hold circuit than has previously been available because of low leakage currents along with high switching speed and low ``on'' resistance. View full abstract»

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  • Firing Circuit for Three-Phase Thyristor-Bridge Rectifier

    Publication Year: 1978, Page(s):45 - 49
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1658 KB)

    Existing firing schemes for the firing of three-phase SCR bridge rectifiers used for industrial applications employ equidistant firing pulses. Mostly they consist of six identical phase control circuits. In this paper a compact scheme using minimum integrated circuit components is described. It has a fast response for triggering angle correction and gives a full range control of voltage. View full abstract»

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  • Series Operation of a DC Shunt Motor

    Publication Year: 1974, Page(s): 205
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Proposed is a transistor circuit connection in the field circuit of a dc shunt motor to give an automatic and simultaneous increase of the field current (while the motor load is coming up), at a rate sufficient for demonstrating a speed-load characteristic similar to that obtainable from a dc series motor. View full abstract»

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  • Transient Thermal Response Measurements of Power Transistors

    Publication Year: 1975, Page(s):134 - 141
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3042 KB)

    Differences between the measured thermal impedance of power transistors when determined by the pulsed heating curve and cooling curve techniques are discussed. These differences are shown to result primarily because the power density distributions of these devices change as devicesheat; as a result of these changes the heating curve and the cooling curve are not conjugate. It is shown that the coo... View full abstract»

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  • Comparison of Multiple-Output DC-DC Converters Using Cross Regulation

    Publication Year: 1980, Page(s):176 - 189
    Cited by:  Papers (37)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2955 KB)

    A new multiple-output dc-dc converter is analyzed, in which the cross regulation is performed by the energy-storage reactor as well as the transformer. The steady-state and the dynamic characteristics of this converter are compared both theoretically and experimentally with those of the conventional one composed of the step-up-down type circuit. As the results of comparative analysis, it is reveal... View full abstract»

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  • Pulse-Width Modulation DC Motor Control

    Publication Year: 1965, Page(s):24 - 28
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    In order to control the speed of a dc series field motor at different required torque levels, it is necessary to adjust the voltage applied to the motor. For any particular constant voltage the motor speed is determined solely by the torque requirements and top speed is reached under minimum torque conditions. When a series motor is used as a traction drive for vehicles, it is desirable to control... View full abstract»

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  • Modeling of DC Motors for Control Applications

    Publication Year: 1974, Page(s):84 - 88
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (710 KB)

    Three different mathematical models of an armature-controlled dc motor are considered: (i) a precise nonlinear model, (ii) a piecewise linear model, and (iii) a second-order linear model. Experimental results are presented comparing the various models, and a range of applications for each is suggested. View full abstract»

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  • Regenerative Braking Performance Analysis of a Thyristor-Chopper Controlled DC Series Motor

    Publication Year: 1981, Page(s):342 - 347
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1234 KB)

    This paper presents a comprehensive analysis which predicts the performance of a thyristor-chopper controlled dc series motor during regenerative braking operation. The analysis takes into account all the possible modes of operation during this type of braking, the nonlinearity of the magnetization characteristics including the variation of the field inductance, and the effect of the commutating c... View full abstract»

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  • A Closed-Loop Control System for the Reduction of Reactive Power Required by Electronic Converters

    Publication Year: 1976, Page(s):162 - 166
    Cited by:  Papers (35)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1345 KB)

    A closed-loop control system to reduce the reactive power required by electronic converters is proposed. The instantaneous reactive power which consists of both displacement of fundamental current and harmonic distortion current is measured and compensated by a reactive power source connected parallel between the power lines and the converter. A combination of a dc choke and a forced-commutated in... View full abstract»

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  • Novel Control Schemes for 3-Phase Zero Voltage Switching

    Publication Year: 1980, Page(s):81 - 86
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1454 KB)

    The use of phase-locked loop (PLL) in 3-ϕ zero voltage switching (ZVS) by sensing 1 ϕ is brought out. The burst and proportional control schemes for 3-ϕ ZVS using off-the-shelf integrated circuits (IC's) are described. The schemes explained employ zero voltage synchronous switching for both steady-state operation and starting. The proportional control scheme uses a voltage ... View full abstract»

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  • Calculation of Self-Heating Current for a Resistance Wire Temperature Sensor

    Publication Year: 1969, Page(s):99 - 102
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (638 KB)

    In many control or instrumentation circuits, a resistance wire temperature sensor is often used to measure the environmental temperature. Because the sensor current itself can change the resistance of the sensor, it is essential that the current required in the sensing circuitry does not cause excessive heating of the sensing element. The power loss caused by any current in the resistance sensor w... View full abstract»

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  • An Improved Method of Resonant Current Pulse Modulation for Power Converters

    Publication Year: 1976, Page(s):133 - 141
    Cited by:  Papers (115)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2173 KB)

    Presented is a converter philosophy for controlled transfer and transformation of electric energy through internal series resonant circuits at high internal power frequencies in excess of 10 kHz. Control of the continuously oscillating high Q series resonant circuit is attained by adjustment of the phase angle ψr between the exciting voltage and the resonant current. Only a very sma... View full abstract»

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  • Speed Control Of Three-Phase Induction Motor by Stator Voltage Control

    Publication Year: 1975, Page(s):172 - 174
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (890 KB)

    A theoretical background for the induction motor input current variation due to variation in speed is presented and the theoretical result is compared with the experimental observations, when the motor speed is varied by variation of input voltage. A six thyristor balaced ciruit is proposed for speed control and its performance is compared with that of sine wave Variac voltage control. View full abstract»

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  • Analysis of a Forced Commutation Circuit for Design of a Class or Thyristor Inverters

    Publication Year: 1973, Page(s):125 - 129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The literature contains a variety of inverter circuits with forced commutation. In general, the auxiliary circuit for switching off the load current carrying thyristors is composed of a number of energy storage components and semiconductor switches which are affected by losses. These circuits demonstrate specific advantages under certain conditions. The analysis of a forced commutated inverter wit... View full abstract»

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  • A Digital Method for DC Motor Speed Control

    Publication Year: 1976, Page(s):44 - 46
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A motor speed controller is presented using digital techniques to measure, compare, and correct motor speed. In the prototype model, the range of speed control is approximately 200 rpm to 3000 rpm. The digital approach eliminates measurement nonlinearity and makes the speed setting exactly reproducible. The prototype's steady-state error is less that 0.2% of maximum speed, and it is shown how a di... View full abstract»

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  • Microprocessor Control of a Three-Phase Inverter in Induction Motor Speed Control System

    Publication Year: 1980, Page(s):291 - 298
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1553 KB)

    The speed control of a three-phase induction motor using the Fairchild F8 microprocessor is described in this paper. In this system, the microprocessor computes the actual motor speed from the pulses received from a shaft encoder, compares the actual and desired speeds, and uses the difference to adjust the frequency of the inverter that feeds the motor. The microprocessor simultaneously varies th... View full abstract»

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  • Biomedical Ultrasonics

    Publication Year: 1970, Page(s):167 - 172
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1046 KB)

    Ultrasound has been widely investigated as a form of radiant energy for bio-medical applications. Both diagnostic and therapeutic techniques have been proposed and studied. Perhaps the greatest effort has been directed toward the development of techniques for imaging internal tissue structures for medical diagnostic purposes. All such techniques are dependent upon both transmitting and receiving t... View full abstract»

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  • Stabilization of Controlled Current Induction Motor Drive Systems via New Nonlinear State Observer

    Publication Year: 1980, Page(s):77 - 81
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (666 KB)

    In this paper a new bilinear and nonlinear second-order state observer which is globally asymptotically stable is constructed to estimate the unmeasurable state variables. Then an unstable controlled current induction motor drive system which cannot be stabilized by a linear state observer is successfully stabilized by feeding the reconstructed state variables from the nonlinear observer to the fr... View full abstract»

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  • Design for Simultaneous Pulse Triggering of SCRs in Three-Phase Bridge Configuration

    Publication Year: 1971, Page(s):104 - 106
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3245 KB)

    The production of common pulse triggering for a three-phase SCR bridge, which features a control circuit that derives its synchronization and power from the ripple potential of a three-phase half-wave rectifier, is the subject of this paper. The ripple potential is separated from the average dc by clamping and after clipping is utilized as bias for a pulse forming UJT circuit. After firing the UJT... View full abstract»

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  • Chopper Controlled Slipring Induction Motor

    Publication Year: 1977, Page(s):153 - 161
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1787 KB)

    Thyristor controlled chopper circuit is used on the rotor side for the speed control of slipring induction motor drive. This control scheme provides contactless and continuous variation of rotor resistance. A thorough analysis of the steady state performance of the system is provided for the following cases: 1. Without filter on the rotor side 2. With 1st order filter on the rotor side 3. With 2nd... View full abstract»

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  • Evaluation of Control Schemes for Thyristor-Controlled DC Motors

    Publication Year: 1978, Page(s):247 - 255
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3183 KB)

    Phase-angle control (PAC) is commonly used in the solid-state control of dc motor drives. This paper investigates other control schemes, such as symmetrical-angle control (SAC), extinction-angle control (EAC), current-limit control (CLC), and time-ratio control (TRC). The drive system with the control schemes is simulated on a digital computer and an efficient time-saving method is used for comput... View full abstract»

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  • A Phase-Locked Loop Motor Control System

    Publication Year: 1975, Page(s):487 - 490
    Cited by:  Papers (30)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1466 KB)

    This paper describes a motor control circuit for a dc motor using phase-locked loop techniques. The purpose of such a control loop is to provide very accurate speed control, repeatability, and synchronization capability. View full abstract»

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  • Chopper Circuits for Direct AC/DC Conversion

    Publication Year: 1973, Page(s):33 - 40
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (929 KB)

    The feasibility of using chopper circuits in ac supply to provide variable dc output is investigated. The three basic chopper circuits are considered and their input and output characteristics are thoroughly studied for direct ac/dc conversion. The performances of these ac-fed choppers for two types of control, time-ratio control (TRC) and phase-shift control (PSC), are compared. One chopper circu... View full abstract»

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  • The Design of Brushless DC Motor Systems

    Publication Year: 1974, Page(s):52 - 60
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1650 KB)

    In critical applications requiring use of a brushless dc motor, the electronics designer is faced with a complex problem. The motor typically has at least five independent parameters that must be specified properly to obtain the best performance. The gear ratio must be selected, and in addition, several parameters in the electronic commutation and control circuitry must be optimized. In this paper... View full abstract»

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  • Symmetrically Pulse Width Modulated AC Chopper

    Publication Year: 1977, Page(s):39 - 45
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2093 KB)

    Output voltage, output current and line current waveforms in a symmetrically pulse width modulated (SPWM) ac chopper are analyzed for harmonic content, displacement factor, distortion factor, power factor and efficiency. The results are compared with those of phase controlled ac chopper circuit to assess the superiority of SPWM ac chopper. A novel SPWM ac chopper with minimum number of active comp... View full abstract»

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  • Critical Inductance and Controlled Rectifiers

    Publication Year: 1965, Page(s):34 - 37
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (663 KB)

    The design of an inductive input filter for a rectifier requires a certain minimum value of inductance in order to have a continuous current in the inductor and, therefore, maintain good regulation. This value is known as the critical inductance. Overbeck determined the critical inductance as a function of firing angle in a controlled rectifier. In this paper we add a diode to the filter which pro... View full abstract»

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  • Currents in Rectifier Bridges

    Publication Year: 1971, Page(s):92 - 98
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1070 KB)

    Algorithms for the numerical calculation of currents in rectifier bridges are presented. The cases dealt with are those of an R-L and R-L-C load with single-phase ac supply, and an R-L-E load with a three-phase supply. The algorithms are presented in such a form as to be easily programmed. The calculation of the currents should be useful in design since simple extensions of the programs would supp... View full abstract»

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  • Electronic Analog Slip Calculator for Induction Motor Drives

    Publication Year: 1980, Page(s):110 - 116
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2024 KB)

    For some schemes of variable speed control of squirrel-cage induction motor fed by a current-source inverter, accurate evaluation of motor slip frequency is essential for obtaining optimum torque output. For evaluating slip accurately, a digital speed transducer coupled to the shaft is generally required. Such a transducer and the associated digital circuits make the system complex and expensive. ... View full abstract»

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  • Automotive Radar for the Prevention of Collisions

    Publication Year: 1964, Page(s):1 - 6
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (829 KB)

    This paper discusses the general considerations which affect the design of a radar used to provide dependable warnings to avoid collisions. A CW Doppler radar, which incorporates a scheme of RF phase comparison to distinguish opening from closing targets, has been road tested and observations are presented. A proposed system is also described. It utilizes the reflected radar signal from another au... View full abstract»

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  • An Improved Microwave Method of Moisture Content Measurement and Control

    Publication Year: 1976, Page(s):364 - 370
    Cited by:  Papers (49)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3063 KB)

    Relations between attenuation and phase shift of electromagnetic waves passing through a wet substance and weights of water and dry substance have been used for calculation of the real value of moisture content of the substance. The result appears to be independent of the denity of the substance, its layer thickness and flatness of its surface. Measuring set-up for continuous measurement requires ... View full abstract»

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  • An Adaptive Low Pass Filter

    Publication Year: 1975, Page(s):47 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (543 KB)

    A low pass filter circuit for periodic functions is proposed which has a variable break frequency. The break frequency is a function of the fundamental frequency of the input waveform. Multiple pole networks may be made by cascading sections of the single pole filter circuit. Adaptive circuit operation depends on principles of feedback, filtering and harmonic content of periodic functions. View full abstract»

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  • Topological Model for a Three-Phase Converter

    Publication Year: 1975, Page(s):519 - 522
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1188 KB)

    The purpose of this article is to develop an efficient model for the analysis of a three-phase converter. An algorithm for the generation of a modified proper tree and fundamental cutset matrix from a network graph is developed, which utilizes much less computer storage space and computation time compared to the classical methods. A three-phase rectifier bridge with its associated protective circu... View full abstract»

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  • A High-Current Low-Pass Filter for Magnet Power Supplies

    Publication Year: 1970, Page(s):16 - 22
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (991 KB)

    The majority of high-current dc power supplies for beam bending magnets have well known LCR low-pass ripple filters. To avoid prohibitive heat losses, the filter damping resistor is in series with the capacitor and not in the dc path. Such filters, when critically damped, attenuate high frequencies by 6 dB/octave. This paper analyzes an improved underdamped LCR filter which attenuates high frequen... View full abstract»

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  • A Generalized Firing Angle Controller Using Phase-Locked Loop for Thyristor Control

    Publication Year: 1981, Page(s):46 - 49
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (861 KB)

    A generalized firing angle controller using a phase-locked loop, for control of thyristors is described. Different types of firing angle variation characteristics are possible because of the generalized phase detector used in the circuit. The controller can operate over a wide range of supply frequencies and is immune to the transients and harmonic distortions in the supply voltage. Also changes i... View full abstract»

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  • A Method of Resonant Current Pulse Modulation for Power Converters

    Publication Year: 1970, Page(s):209 - 221
    Cited by:  Papers (58)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2697 KB)

    A nonlinear, active network that transforms the voltage waveform of a unipolar source of energy is presented. This network consists of ideally lossless elements such as inductors, capacitors, and on-off switches. Control is obtained by variation of the mode of switch operation. A circuit philosophy is applied which is adapted to the characteristics of switch operation and confines the stresses imp... View full abstract»

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  • Application of RF Circuit Design Principles to Distributed Power Converters

    Publication Year: 1980, Page(s):156 - 164
    Cited by:  Papers (70)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5875 KB)

    The application of RF circuit design principles to high-frequency power converters is described. Compared to conventional converter design, emphasis is placed on obtaining sinusoidal-type waveforms (instead of rectangular-type waveforms) to minimize device switching time requirements and alleviate transforming requirements. A 25-W 48-V to 5-V dc-to-dc converter design using a 5-MHz switching frequ... View full abstract»

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  • Microwave Doppler-Effect Flow Monitor

    Publication Year: 1975, Page(s):224 - 228
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2181 KB)

    This paper contains a discussion of the capabilities and limitations of a modem solid-state microwave Doppler radar used for monitoring the flow rates of moving materials. Experimental results Of monitoring flow rates of paritculate solids are presented. It has been concluded that the average Doppler frequency is proportional to the average bulk velocity. When the bulk density and the crosssection... View full abstract»

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  • Wide-Range Frequency Divider Using Hybrid Circuits

    Publication Year: 1976, Page(s):66 - 70
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1162 KB)

    The limitation on the range that a monostable multivibrator can be used as a frequency divider is studied and identified as due to the recovery time of the circuit. It is shown that by coupling a chain of bistable flip-flops to the mono the frequency division ratio can be increased substantially while maintaining the basic flexibility of the mono as a frequency divider. The ultimate ceiling on the... View full abstract»

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  • A Brushless Hall Generator DC Servomotor

    Publication Year: 1974, Page(s):75 - 77
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (594 KB)

    The brushless dc servomotor described consists of two basic components: 1) a brushless dc motor unit featuring a permanent magnet rotor with Hall effect devices for sensing rotor position, and 2) an electronic control package. One important feature of the control package was a nonlinear operational amplifier circuit which eliminated control input deadband and supplied a negative feedback control s... View full abstract»

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  • Design Methods for Current Source Inverter/Induction Motor Drive Systems

    Publication Year: 1975, Page(s):141 - 145
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1969 KB)

    A current source inverter combined with a controlled slip induction motor is a reliable and rugged ac drive system. The majority of the inverters in use today are the voltage source type using auxiliary impulse commutation. However, recent advances in SCR blocking voltage capability are making the complementary impulse commutated current source inverter a viable competitor View full abstract»

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  • Optimum DC Dynamic Braking Control of an Induction Motor Using Thyristor Chopper Controlled Resistance

    Publication Year: 1974, Page(s):60 - 65
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The optimum dc dynamic braking control here implies that, at all the speeds, the motor is operated at peak torque point. This can be achieved by controlling the rotor resistance of an induction motor such that the peak torque occurs at the speed at which the motor is running. The optimum control permits the stopping of a load in a minimum time with minimum heating of the motor and therefore is use... View full abstract»

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  • Constant Voltage, Current, and Power Circuits: A Network Theoretic Approach

    Publication Year: 1981, Page(s):364 - 369
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1375 KB)

    A network theoretic approach is employed to derive a number of circuits for i) constant load current, ii) constant load voltage, and iii) constant magnitude input current, when the load varies over a wide range. It is shown that a circuit delivering constant power to a varying load does not exist, and that the range of load, over which the power does not fall below a specified fraction of the maxi... View full abstract»

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  • A Stepper Motor System for Profile Following and Cutting

    Publication Year: 1974, Page(s):66 - 70
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (746 KB)

    The function of an automatic profile cutter is to cut from the work material a replica, possibly scaled, of a given shape. The profile may be available as an ink outline drawing or a template. There are two functions involved in the process: one is the following of the outline of the shape. The other is the positioning and control of the cutting tool. A digital system employing stepper motors as p... View full abstract»

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  • Logic Rating of Electromechanical Relays

    Publication Year: 1975, Page(s):66 - 68
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (834 KB)

    Electromechanical relays were the first logic element used in a computer. Today, small compact reed relays are again being extensively used as logic elements. A logic factor, FL, measures the improvement that a logic device can affect if interposed between a logic source and logic detector. A logic figure of merit, TFM, determined when FL = 1.0 can be used for comparison of the logic performance o... View full abstract»

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  • Analysis of a Class of Pulse Modulated DC-to-DC Power Converters

    Publication Year: 1975, Page(s):104 - 116
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7242 KB)

    The basic operational characteristics of dc-to-dc converters are analyzed. The basic physical characteristics of power converters are identified. A simple class dc-to-dc power converters is chosen which could satisfy any set of operating requirements. Three different controlling methods in this class are described in detail. Necessary conditions for the stability of these converters are measured t... View full abstract»

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  • Optimum Design of Commutation Circuit in a Thyristor Chopper for DC Motor Control

    Publication Year: 1976, Page(s):129 - 132
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1113 KB)

    This paper deduces the expressions for the commutating capacitor voltage and current during the commutation period of the main and auxiliary thyristor in a chopper for a dc motor control system. After a successful commutation, a certain amount of energy is ``stored'' in the circuit components, and for best component utilization this stored energy has to be minimized. The procedure of minimum store... View full abstract»

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  • Neo-modern control theory: Linear and nonlinear servomechanism design

    Publication Year: 1966, Page(s):72 - 82
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1703 KB)

    In designing and analyzing Type 1, second-order feedback control systems, a linear mode technique is the usual method of approach. Any adverse effects on system performance due to non-linearities are often explained away as the limiting condition in which the system can operate with any degree of predictability. It is the purpose of this paper to present a neomodern control theory with emphasis on... View full abstract»

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  • Analysis of Chopper-Fed DC Series Motor

    Publication Year: 1976, Page(s):92 - 97
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1383 KB)

    The main problem in the analysis of chopper-fed dc series is due to the interdependence of armature induced voltage and the armature current and the fact that the relation between the two is nonlinear. The different aspects of analysis such as performance equations, methods of their solution, and the representation of nonlinear magnetization characteristics of the dc series motor are described. Th... View full abstract»

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Aims & Scope

This Transactions ceased production in 1981. The current retitled publication is IEEE Transactions on Industrial Electronics.

Full Aims & Scope