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Relevant bibliographies by topics / Direct drive (DD)

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Academic literature on the topic 'Direct drive (DD)'

Author: Grafiati

Published: 28 May 2022

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Journal articles on the topic "Direct drive (DD)"

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KOYANAGI, KEN'ICHI, and JUNJI FURUSHO. "DIRECT-DRIVE MOTOR SYSTEM WITH PARTICLE-TYPE ER FLUID DAMPER." International Journal of Modern Physics B 19, no. 07n09 (2005): 1661–67. http://dx.doi.org/10.1142/s0217979205030736.

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In most of robotic systems in industrial applications, vibratory problems occur at high-speed motion, because of elasticity of drive systems like reduction gear units and mechanical structures. Also friction and backlash in the drive systems cause serious problems. On the other hand, since direct-drive (DD) motor systems do not use reduction gears, those are effective for high-speed and high-precision control. In DD motor systems, however, low damping ratio, or large time delays of computers and amplifiers causes another type of problem at precise positioning phase. In this study, a particle t

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deSilva, C. W., T. E. Price, and T. Kanade. "Torque Sensor For Direct-Drive Manipulators." Journal of Engineering for Industry 109, no. 2 (1987): 122–27. http://dx.doi.org/10.1115/1.3187101.

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This paper describes the development of a joint torque sensor for the second direct-drive manipulator at Carnegie-Mellon University (CMU DD Arm II). The approach taken is to develop the sensor using static design considerations and then test it to verify its dynamic performance. Several design considerations applicable to semiconductor strain-gage torque sensors are presented. These are strain capacity limit, nonlinearity, sensitivity, and stiffness specifications. Associated design equations have been developed in the present work. A numerical example is given to illustrate the use of these d

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Ikegami, Takakazu, Toshiki Hirogaki, and Eiichi Aoyama. "Development of Direct Drive Motor for Machine Tools and its Performance in Machining." Advanced Materials Research 1136 (January 2016): 661–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.661.

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This paper describes the development of a direct drive motor (DD motor) without a reduction gear for the rotary motion of machine tools and its performance. We investigate novel DD motors from a view of total performance on machine tools. Moreover, we estimate to employ the developed DD motors for 5-axis control machine tools and the multi-functional machine tools. The study proves the required performance of rotary motion is achieved on machine tools, and the developed DD motors are found to be effective as follows. First, designing a DD motor with quality engineering and FEM analysis of elec

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Suzuki, Tamotsu. "DD-type Linear Motor Systems and Their Applications." Journal of Robotics and Mechatronics 1, no. 4 (1989): 328–32. http://dx.doi.org/10.20965/jrm.1989.p0328.

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Carrying and positioning systems for linear movement in factory automation are typically a combination of a motor and motion-translating mechanisms, such as ball screws, belts, and racks and pinions. Such mechanical motion-translating mechanisms, however, have the disadvantages of limited accuracy, speed, and durability. As a solution to this problem, direct-drive linear motors, which drive an object directly mounted on the drive section, have attracted considerable interest, and various types of linear motors have been actually used. The recent trend in linear motor development has been such

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Kamiya, Shingo, Masakane Shigyo, Tatsuo Makino, and Nobuyuki Matsui. "DSP-based high-precision torque control of permanent magnet DD (direct drive) motor." Electrical Engineering in Japan 110, no. 4 (1990): 51–58. http://dx.doi.org/10.1002/eej.4391100406.

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IMURA, Junichi, Toshiharu SUGIE, and Tsuneo YOSHIKAWA. "Experiments of an Adaptive Robust Control Method Using a Direct-Drive Arm." Transactions of the Society of Instrument and Control Engineers 28, no. 8 (1992): 1016–18. http://dx.doi.org/10.9746/sicetr1965.28.1016.

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Bogosyan, S., and A. Arabyan. "High-order, sliding-mode-based precise control of direct-drive systems under heavy uncertainties." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 221, no. 5 (2007): 791–805. http://dx.doi.org/10.1243/09596518jsce393.

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The high-performance control of direct-drive (DD) systems requires the full system dynamic effects to be taken into account owing to the eliminated gear mechanism. The actuator dynamics and structural flexibilities become of increased importance, particularly when high-speed, high-accuracy operation of lightweight structures is aimed for; however, in most related literature, these effects are neglected to avoid increased computational complexity at the expense of compromising the tracking accuracy of the system in the transient and steady state. As a solution to the problem, in this study, hig

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Curk, Boris, and Karel Jezernik. "Sliding mode control with perturbation estimation: application on DD robot mechanism." Robotica 19, no. 6 (2001): 641–48. http://dx.doi.org/10.1017/s0263574701003629.

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In this work another perturbation estimation sliding mode based control algorithm is introduced for a class of robotic systems in the presence of structured and unstructured uncertainties and external disturbances. The effects of these uncertainties are combined into a single quantity. A full order device with the actuator voltages as control inputs is assumed in control design. The decentralized control scheme with only a partial state feedback is applied. A modification of the switching functions with perturbation estimation is introduced. The salient features of this approach is that the pe

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Cui, Bo, Zhiheng Fang, Zenghai Dai, et al. "Nuclear diagnosis of the fuel areal density for direct-drive deuterium fuel implosion at the Shenguang-II Upgrade laser facility." Laser and Particle Beams 36, no. 4 (2018): 494–501. http://dx.doi.org/10.1017/s026303461800054x.

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AbstractIn inertial confinement fusion experiments that involve short-laser pulses such as fast ignition (FI), diagnosis of neutrons is usually very challenging because high-intensity γ rays generated by short-laser pulses would mask the much weaker neutron signal. In this paper, fast-response scintillators with low afterglow and gated microchannel plate photomultiplier tubes are combined to build neutron time-of-flight (nTOF) spectrometers for such experiments. Direct-drive implosion experiments of deuterium-gas-filled capsules were performed at the Shenguang-II Upgrade (SG-II-UP) laser facil

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Li, Yin Xing, Peng Hui Liu, and Jun Li Zhang. "Research on Low Voltage Ride-Through Technique in DD-PMSG Wind Power Generator System." Applied Mechanics and Materials 300-301 (February 2013): 108–11. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.108.

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In order to achieve the power grid voltage default ride-through, the permanent magnet direct-drive type wind power generator system is employed. The Crowbar resistance and the STATCOM operation mode are two effective methods to control the DC capacitor voltage not to rise and to help the power grid voltage restoration. The power grid voltage default is little and the STATCOM operation mode is applied. The Crowbar resistance is invested to the wind power generator system when the voltage default is large. The methods introduced in this paper are applied in other variable speed fixed frequency w

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Conference papers on the topic "Direct drive (DD)"

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Jurak, Tine, and Vito Tič. "Development of direct driven servo hydraulic actuator." In International conference Fluid Power 2021. University of Maribor Press, 2021. http://dx.doi.org/10.18690/978-961-286-513-9.7.

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Direct control of hydraulic cylinders - without use of control valve, represents a newer concept of energy-saving control of cylinders, without damping losses. In order to study this type of drive, it is necessary to design and manufacture a compact model of such device to study the control concepts and to check the operation of the system. We will study the existing implementations of such drives and create our own direct driven servo-hydraulic actuator (hereinafter DD SHA), with which we will move different loads. A servomotor must be attached to a suiTable hydrostatic unit (pump-motor). All

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Mohammadi, Foad, Iman Hemmatian, and Kambiz Ghaemi Osgouie. "Design Optimization of Gimbal Robotic Joints Based on Task Space Manipulability." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24032.

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Featuring a nonlinear novel design, Gimbal transmission, is a replacement for traditional robotic joints like gearboxes and revolute joints. This mechanism is one of the most recent types of nonlinear direct transmission (DT) methods in robots. As an alternative for traditional drive methodologies — herein called direct drive transmission (DD) methods, DT provides dynamic coupling and joint interaction attenuation while its capability to be adjusted for a desired task space point, smooth input-output characteristic, and varying reduction ratio lead to a desired force and motion behavior for th

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