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Motor Drive (motor + drive)

Distribution by Scientific Domains
Engineering54%
Medical Sciences18%

Kinds of Motor Drive

  • induction motor drive
    		•

    Selected Abstracts

    Speed estimation of induction motor drive using d -axis slot harmonics and parameter identification method

    ELECTRICAL ENGINEERING IN JAPAN, Issue 2 2010
    Toshihiko Noguchi
    Abstract This paper describes a rotor speed estimation technique of an induction motor, which utlizes slot harmonics on the d -axis caused by permeance variation across the air gap. The frequency of the slot harmonics is a multiple of the actual rotor speed, and is proportional to the number of rotor slots. In order to extract the slot harmonics, a novel adaptive bandpass filter incorporating coordinate transformation is proposed, which is effective to estimate the rotor speed from 400 to 2000 rpm. This rotor speed estimation is applied to a field-oriented controller as well as a speed controller. In addition, performance improvement is carried out by compensating a motor parameter mismatch. Feasibility of the proposed technique is confirmed through several tests, using a prototype experimental setup. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 171(2): 50,58, 2010; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/eej.20901 [source]

    Tuning and parameter variation effects in MRAS based speed estimator for sensorless vector controlled induction motor drives

    EUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 3 2002
    M. Wang
    A frequently applied method of speed-sensorless rotor flux oriented control of induction machines relies on utilisation of model reference adaptive system (MRAS) based speed estimation, where the outputs of the reference and the adjustable model are selected as rotor flux space phasors. Accuracy of the method heavily depends on correct setting of the machine parameters and adjustment of the filter and Pl controller parameters within the estimator. The paper at first describes tuning of various parameters of the estimator, using purely experimental data. The speed estimator is operated in parallel with a commercially available rotor flux oriented induction motor drive with speed sensor and sampled stator voltages and currents are used to tune induction motor parameters, various filters and the Pl controller within the estimator. The procedure is described and illustrated using a comparison between the measured actual speed response during acceleration transients and the corresponding speed estimate obtained from the speed estimator. In the second part of the paper, speed estimation error that will take place in the base speed region due to incorrect setting and/or variation of the parameters of the machine (stator resistance, rotor resistance and magnetising inductance) within the speed estimator is assessed using experimentally recorded data. The experimental results are found to be in very good agreement with previously published theoretical results. [source]

    Position-sensorless direct-torque-controlled synchronous motor drive for ship propulsion

    EUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 6 2000
    M. Niemelä
    A new concept is proposedfor position-sensorless Direct-Torque-Controlled (DTC) synchronous motor drives for ship propulsion. The principles of determination of the initial rotor position at standstill or the position of a rotating rotor, the operation at zero speed and at low rotational speeds in general are described. The study introduces also a flux linkage estimate correction method for the DTC. Some of the results of the numerous experiments performed with a laboratory prototype drive are given. [source]

    Robust speed estimation and control of an induction motor drive based on artificial neural networks

    INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Issue 5 2008
    Oscar Barambones
    Abstract In this paper, a speed estimation and control scheme of an induction motor drive based on an indirect field-oriented control is presented. On one hand, a rotor speed estimator based on an artificial neural network is proposed, and on the other hand, a control strategy based on the sliding-mode controller type is proposed. The stability analysis of the presented control scheme under parameter uncertainties and load disturbances is provided using the Lyapunov stability theory. Finally, simulated results show that the presented controller with the proposed observer provides high-performance dynamic characteristics and that this scheme is robust with respect to plant parameter variations and external load disturbances. Copyright © 2007 John Wiley & Sons, Ltd. [source]

    Mechanisms underlying mirror movements in Parkinson's disease: A transcranial magnetic stimulation study

    MOVEMENT DISORDERS, Issue 7 2006
    Massimo Cincotta MD
    Abstract The neural mechanisms underlying unintended mirror movements (MMs) of one hand during unimanual movements of the other hand in patients with Parkinson's disease (PD) are largely unexplored. Here we used surface electromyographic (EMG) analysis and focal transcranial magnetic stimulation (TMS) to investigate the pathophysiological substrate of MMs in four PD patients. Surface EMG was recorded from both abductor pollicis brevis (APB) and first dorsal interosseous (FDI) muscles. Cross-correlation EMG analysis revealed no common motor drive to the two APBs during intended unimanual tasks. Focal TMS of either primary motor cortex (M1) elicited normal motor-evoked potentials (MEPs) in the contralateral APB, whereas MEPs were not seen in the ipsilateral hand. During either mirror or voluntary APB contraction, focal TMS of the contralateral M1 produced a long-lasting silent period (SP), whereas stimulation of the ipsilateral M1 produced a short-lasting SP. During either mirror or voluntary finger tapping, 5 Hz repetitive TMS (rTMS) of the contralateral M1 disrupted EMG activity in the target FDI, whereas the effects of rTMS of the ipsilateral M1 were by far slighter. During either mirror or voluntary APB contraction, paired-pulse TMS showed a reduction of short-interval intracortical inhibition in the contralateral M1. These findings provide converging evidence that, in PD, MMs do not depend on unmasking of ipsilateral projections but are explained by motor output along the crossed corticospinal projection from the mirror M1. © 2006 Movement Disorder Society [source]

    Application of ultrasound and neural networks in the determination of filler dispersion during polymer extrusion processes

    POLYMER ENGINEERING & SCIENCE, Issue 6 2005
    Zhigang Sun
    Mineral filler dispersion is important information for the production of mineral-charged polymers. In order to achieve timely control of product quality, a technique capable of providing real-time information on filler dispersion is highly desirable. In this work, ultrasound, temperature, and pressure sensors as well as an amperemeter of the extruder motor drive were used to monitor the extrusion of mineral-filled polymers under various experimental conditions in terms of filler type, filler concentration, feeding rate, screw rotation speed, and barrel temperature. Then, neural network relationships were established among the filler dispersion index and three categories of variables, namely, control variables of the extruder, extruder-dependent measured variables, and extruder-independent measured variables (based on ultrasonic measurement). Of the three categories of variables, the process control variables and extruder-independent ultrasonically measured variables performed best in inferring the dispersion index through a neural network model. While the neural network model based on control variables could help determine the optimal experimental conditions to achieve a dispersion index, the extruder-independent network model based on ultrasonic measurement is suitable for in-line measurement of the quality of dispersion. This study has demonstrated the feasibility of using ultrasound and neural networks for in-line monitoring of dispersion during extrusion processes of mineral-charged polymers. POLYM. ENG. SCI., 45:764,772, 2005. © 2005 Society of Plastics Engineers [source]

    Affective modulation of inspiratory motor drive

    PSYCHOPHYSIOLOGY, Issue 1 2009
    Ilse Van Diest
    Abstract The present study aimed to explore inspiratory motor drive as measured by inspiratory occlusion pressure (P100) during affective picture viewing. P100 is the decrease in mouth pressure that develops 100 ms after an inspiratory effort against a closed breathing circuit. The P100 is a measure of the "central respiratory drive." Seventy-eight healthy women viewed four pictures series (160 s) varying in content: neutral, positive, threat, or pain. They also rated each picture series on pleasantness and arousal. An occlusion was applied at the onset of inspiration in 33% of the breaths. The threat and the pain picture series were associated with an increased P100 and were rated as most unpleasant and highest in arousal. We conclude that inspiratory motor drive is affectively modulated and is a measure of the respiratory response to threatful stimuli. [source]

    Incorporation of Electronics within a Compact, Fully Implanted Left Ventricular Assist Device

    ARTIFICIAL ORGANS, Issue 11 2002
    Kevin Bourque
    Abstract: The promise of expanded indications for left ventricular assist devices in the future for very long-term applications (10+ years) prompts sealed (i.e. fully implanted) systems and less-obtrusive and more reliable implanted components than their external counterparts in percutaneous configurations. Furthermore, sealed systems increase the fraction of total power losses dissipated intracorporeally, a disadvantage that must be carefully managed. We set out to incorporate the motor drive and levitation control electronics within the HeartMate III blood pump without substantially increasing the pump's size. Electronics based on a rigid-flex satellite printed circuit board (PCB) arrangement that could be folded into a very compact, dense package were designed, fabricated, and tested. The pump's lower housing was redesigned to accommodate these PCBs without increasing any dimension of the pump except the height, and that by only 5 mm. The interconnect cable was reduced from 22 wires to 10 (two fully redundant sets of 5). An ongoing test of the assembled pump in vitro has demonstrated no problems in 5 months. In addition, a 20-day in vivo test showed only 1°C temperature rises, equivalent to pumps without incorporated electronics at similar operating conditions. [source]

    Vector control for induction motor drives based on adaptive variable structure control algorithm ,

    ASIAN JOURNAL OF CONTROL, Issue 5 2010
    O. Barambones
    Abstract This paper presents a new adaptive robust control for induction motor drives. The proposed control scheme is based on the so-called field oriented control theory that allows to control the induction motor like a separately excited direct current motor drive, where the field flux (produced by the field current) and the armature flux (produced by the armature current) are decoupled. The robust control law is based on the sliding mode control theory, but unlike the traditional sliding mode control schemes, the proposed design incorporates an adaptive switching gain that avoids the need of calculating an upper limit of the system uncertainties. Moreover the proposed control law is smoothed out in order to avoid the high control activity inherent to the switching control laws. The resulting closed loop system is proven to be stable using the Lyapunov stability theory. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source]