The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
A. Safacas - One of the best experts on this subject based on the ideXlab platform.
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Behavior of a drive system consisting of two DC motors with elastic shafts driving the Yankee drying cylinder of a tissue paper machine
The 4th International Power Electronics and Motion Control Conference 2004. IPEMC 2004., 2004Co-Authors: C. Michael, A. SafacasAbstract:In this paper the behavior of elastic shafts in a drive system consisting of two D.C. motors driving the Yankee drying cylinder of a tissue paper machine is investigated. The motors are fed by two 6-pulse thyristor converters connected to the same power transformer. The master motor has a Tachogenerator to measure the speed of the system. Control logic is proposed to control the torque of the two DC motors. The control can be achieved in such a way that the two motors contribute the same amount to the total load in the case that the DC motors are identical, or contribute partly to the total load and proportionally to their nominal torques in the case that the two motors are not identical. The adjustment of the acceleration time and the parameters of the PI controllers is investigated in order to keep the maximum armature current below the limit of maximum permissible current and to achieve an optimum speed response of the system. The use of different elastic shafts (different stiffness) connected between DC motors and gearbox is investigated. The shaft of the Yankee drying cylinder is so thick that it can be considered as a stiff shaft without elasticity. The analysis of the system is realized using the SIMULINK software. Characteristic simulation results are presented.
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Analysis of a drive system consisting of two DC motors driving the Yankee drying cylinder of a tissue paper machine
2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692), 2003Co-Authors: C. Michael, A. SafacasAbstract:In this paper the analysis of a drive system consisting of two D.C. motors driving the Yankee drying cylinder of a tissue paper machine is presented. Two 6-pulse thyristor converters connected to the same power transformer feed the motors. The motor, which has on it the Tachogenerator to measure the speed, is the master motor and the other motor is the helper. Control logic is proposed to control the torque of the two DC motors. The control can be achieved in such a way that the two motors contribute equally to the total load when the DC motors are identical, or contribute partly to the total load and proportionally to their nominal torques, if the two motors are not identical. The adjustment of the acceleration time and the parameters of the controllers are investigated, in order to keep the armature current below the maximum permissible current as well as to achieve an optimum speed response of the system. The commissioning time can be reduced significantly, adjusting the acceleration time and the controllers' parameters, and so the distress of the system's electrical and mechanical parts can be avoided. Any possible damages caused by the rapid or unstable operation of the electrical and mechanical parts during commissioning and tests also can be avoided. A fine adjustment of the real system in less time during commissioning can be obtained after the determination of the acceleration time and controllers' parameters. The analysis of the system is realized using the SIMULINK software. Typical simulation results are presented.
C. Michael - One of the best experts on this subject based on the ideXlab platform.
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Behavior of a drive system consisting of two DC motors with elastic shafts driving the Yankee drying cylinder of a tissue paper machine
The 4th International Power Electronics and Motion Control Conference 2004. IPEMC 2004., 2004Co-Authors: C. Michael, A. SafacasAbstract:In this paper the behavior of elastic shafts in a drive system consisting of two D.C. motors driving the Yankee drying cylinder of a tissue paper machine is investigated. The motors are fed by two 6-pulse thyristor converters connected to the same power transformer. The master motor has a Tachogenerator to measure the speed of the system. Control logic is proposed to control the torque of the two DC motors. The control can be achieved in such a way that the two motors contribute the same amount to the total load in the case that the DC motors are identical, or contribute partly to the total load and proportionally to their nominal torques in the case that the two motors are not identical. The adjustment of the acceleration time and the parameters of the PI controllers is investigated in order to keep the maximum armature current below the limit of maximum permissible current and to achieve an optimum speed response of the system. The use of different elastic shafts (different stiffness) connected between DC motors and gearbox is investigated. The shaft of the Yankee drying cylinder is so thick that it can be considered as a stiff shaft without elasticity. The analysis of the system is realized using the SIMULINK software. Characteristic simulation results are presented.
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Analysis of a drive system consisting of two DC motors driving the Yankee drying cylinder of a tissue paper machine
2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692), 2003Co-Authors: C. Michael, A. SafacasAbstract:In this paper the analysis of a drive system consisting of two D.C. motors driving the Yankee drying cylinder of a tissue paper machine is presented. Two 6-pulse thyristor converters connected to the same power transformer feed the motors. The motor, which has on it the Tachogenerator to measure the speed, is the master motor and the other motor is the helper. Control logic is proposed to control the torque of the two DC motors. The control can be achieved in such a way that the two motors contribute equally to the total load when the DC motors are identical, or contribute partly to the total load and proportionally to their nominal torques, if the two motors are not identical. The adjustment of the acceleration time and the parameters of the controllers are investigated, in order to keep the armature current below the maximum permissible current as well as to achieve an optimum speed response of the system. The commissioning time can be reduced significantly, adjusting the acceleration time and the controllers' parameters, and so the distress of the system's electrical and mechanical parts can be avoided. Any possible damages caused by the rapid or unstable operation of the electrical and mechanical parts during commissioning and tests also can be avoided. A fine adjustment of the real system in less time during commissioning can be obtained after the determination of the acceleration time and controllers' parameters. The analysis of the system is realized using the SIMULINK software. Typical simulation results are presented.
Zheng-ping Xu - One of the best experts on this subject based on the ideXlab platform.
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Slip motor speed control system based on LPC2136 and low cost CMOS camera
2010 2nd International Conference on Advanced Computer Control, 2010Co-Authors: Shou-wang Yang, Wen-qi Ge, Zheng-ping XuAbstract:In this paper, designed the slip motor speed control system for packing rubber strip which is used in plastic steel door and window. The system, 32-bit embedded microprocessor LPC2136 as the control core, PWM speed control, velocity feedback from Tachogenerator, rubber strip position feedback from the CMOS camera, has proved that CMOS camera's image quality meets the engineering requirement; Slip motor speed is in the precision of 1 percent in scope of 0 to 1400rpm. Practical application shows that the system is reliable, stable and higher precision of control. The system design provides reference for similar control system and builds the basis for the design of intelligent control system.
Shou-wang Yang - One of the best experts on this subject based on the ideXlab platform.
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Slip motor speed control system based on LPC2136 and low cost CMOS camera
2010 2nd International Conference on Advanced Computer Control, 2010Co-Authors: Shou-wang Yang, Wen-qi Ge, Zheng-ping XuAbstract:In this paper, designed the slip motor speed control system for packing rubber strip which is used in plastic steel door and window. The system, 32-bit embedded microprocessor LPC2136 as the control core, PWM speed control, velocity feedback from Tachogenerator, rubber strip position feedback from the CMOS camera, has proved that CMOS camera's image quality meets the engineering requirement; Slip motor speed is in the precision of 1 percent in scope of 0 to 1400rpm. Practical application shows that the system is reliable, stable and higher precision of control. The system design provides reference for similar control system and builds the basis for the design of intelligent control system.
Dan Huang - One of the best experts on this subject based on the ideXlab platform.
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Experiment and Test Signal Analysis Based on Speed Fluctuation of Torsional Vibration of Large-Scale Rotary Machinery
Advanced Materials Research, 2011Co-Authors: Wu Zhao, Dan HuangAbstract:A new mode of fault monitoring and controling methods on rotating speed fluctuation was proposed in this study. Torsional vibration model and identification equation of speed fluctuation of large-scale rotary machinery was established based on a two-mass motor driving model. Tachogenerator was adopted to measure speed fluctuation in torsional vibration experiment of large-scale rotary machinery. According to the short time fourier transforms method, the non-steady cyclical or quasi-cyclical characteristics signal of rotating speed fluctuation on elastic shafts were transformed into steady signal to study in a fixed time window function. The methods of monitoring rotating speed fluctuation developed nonlinear stable state signal processing into linear short time fourier transforms signal. The real rotating speed fluctuation solution could be obtained after the data of signal acquisition post-processing by the methods of frequency spectrum analysis and modal analysis. Based on data of signal acquisition, using the methods of fourier phase frequency spectrum, logarithm amplitude frequency spectrum, and self-power spectrum, the quantitative expression under the quantitative analysis stable state was obtained. Through the introduction of realtime signal on rotating speed fluctuation to feedback control system, it is easy to program to realize the real-time on-line torsional vibration monitor of the complex mechanism transmission system on the large scale rotating machinery.
