Evaluation of Control Schemes for Thyristor-Controlled DC Motors

Sen, P.C.; Doradla, S.R.

doi:10.1109/tieci.1978.351560

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…Eqs. (1 6) and (17) are then directly involved in an iterative process, required to evaluate the boundary parameters Il(n) and I&), that satisfy the condition for steady-state operation. This is simply accomplished when 11( 1) = I,(N + 1).…”

Section: (19)mentioning

confidence: 99%

Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

Hamed

1993

Int Trans Elec Energy Syst

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With the increasing availability of power transistor switches, PWM controlled rectifiers can efficiently and economically be employed in low and medium power applications of DC drive systems. In this paper, steady‐state modelling and solution of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive is accomplished. The developed model is presented in a generalized form that is applicable irrespective of the number of pulses per supply half‐cycle. Measured and predicted parameters are shown to be very close and the model is proved to be efficient and accurate. Both continuous and discontinuous modes of operation are covered, and critical operating conditions at which the system moves from one mode to the other are thoroughly investigated. The effects of the armature inductance‐to‐resistance ratio and the chopping frequency on these critical conditions, load and line harmonics, and on the ripple contents of the armature current are also thoroughly investigated.

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Section: (19)mentioning

confidence: 99%

Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

Hamed

1993

Int Trans Elec Energy Syst

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“…Each of its six legs has three powered joints and is articulated roughly in the form of an insect's leg. The motors are industrialquality drill motors controlled by triacs with halfwave phase control (Buckett 1977;Sen and Doradla 1978). Each joint is equipped with a potentiometer and a tachometer for position and rate sensing respectively.…”

Section: The Hexapod Control Problemmentioning

confidence: 99%

Use of a Multiprocessor for Control of a Robotic System

Klein

Wahawisan

1982

The International Journal of Robotics Research

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In the control of robotic systems, multiprocessors have a number of potential advantages over single-processor configurations. These advantages include the possibility of modular future expansion, increased speed, and fault tolerance. This paper describes both the hardware and software design of a multiprocessor system and its use in controlling the OSU Hexapod vehicle, a complex robotic system.With the design of an inexpensive, high-density, eight-channel parallel line unit (PLU), it is possible to link five LSI-11 processors in a fully connected configuration. This configuration is very valuable for experimentation, since trials of tree, star, and loop structures can be made by simply ignoring links that are not needed. First, a tree structure is used to implement a hierarchical control algorithm run on a previously used uniprocessor system. Next, fault-tolerant features are added so that failed units are automatically replaced by spare units or, if all spares are in use, the necessary tasks are covered by the central processor, with a decrease in servoing frequency. To decentralize control to improve overall reliability, a ring structure is also used. If a processor fails, the ring is automatically reconfigured to isolate the faulty unit. Another application for the multiprocessor in the control of the OSU Hexapod vehicle is for real-time optimization of leg tip forces. This task demonstrates the usefulness of the multiprocessor in a task that is not strictly parallel in form.

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“…A large number of schemes, using natural and forced commutation, have been developed for the improvement of PF and reduction of harmonics (Farrer et al 1978, Kataoka et al 1979, Krishnamurthy et al 1978, Mehta et al 1975, Sen et al 1978. Generally, the schemes with natural commutation are preferred because of their reliable operation and lower equipment cost, though the forced commutation methods can give better PF and allow harmonics to be reduced to a greater extent.…”

Section: Introductionmentioning

confidence: 99%

“…1978) ; (3) extinction angle control (Sen et at. 1978); (4) two pulse modulation with one forced commutation per half cycle; (5) symmetrical pulse modulation with one pulse per half cycle (Sen et at. 1978 Schemes I to .5 above are repeated with two bridges connected in series.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of single phase converter control schemes

Patel

Dubey

1983

International Journal of Electronics

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The paper presents the comparative study of some methods of power factor control and harmonic reduction of single phase converters. The comparison is done on the basis of power factor, dominant harmonics in source current, distortion factor, Rl\lS line current, reactive power, second harmonic in load voltage and load voltage ripple factor. The data presented can be usefully employed in selecting a suitable scheme for a particular application.

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Evaluation of Control Schemes for Thyristor-Controlled DC Motors

Cited by 15 publications

References 7 publications

Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

Use of a Multiprocessor for Control of a Robotic System

Comparative study of single phase converter control schemes

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