Papers by Keyword: Servo-System

Abstract: The requirements of CNC machine tools for the feed servo system could generally be summarized as high precision, well stability, fast response, wide range of speed regulation, high torque at low speed and so on. The PID controller of feed servo-system based on intelligent fuzzy control was presented based on traditional PID controller. The main feature of this arithmetic was to change parameters in different degrees according to time-varying working conditions, specially this arithmetic could change its domain intelligently according to different conditions and cooperated with a stable controller in case of system crash so that adaptivity and reliability of the feed servo-system were improved, also this feature made application field of the feed servo-system wider.

Abstract: This paper deals with the use of Programmable Multi-Axis Controller (UMAC) based on preview control method to give good trajectory tracking performance of 3-axis servo table. The paper consists of mathematical modeling, simulation, and an experimental work. Adopt the position coordinate method of three-dimensional space trajectory tracking. In this paper, based on previous research, it gives a trajectory tracking control algorithm, constructs an experimental system used to implement trajectory tracking, establishes its mathematical model, then uses the control algorithm to carry out simulation analysis, and finally uses the simulation results to carry out experimental study. In this paper, the experimental system, which decomposes object trajectory to various axes for tacking, is effective. It takes the best motion controller as the core, and takes servo motor as driving mechanism to drive precision positioning platform. It possesses of powerful real time and linkage performance, and the powerful hardware and software function enable it to have a wide range of applications.

Abstract: In this paper, mathematical model of CNC machine tool’s feed servo system is established, various control methods of feed servo system in CNC machine tool are summarized, simulation models in different control modes are constructed by using MATLAB Simulink tools, also the influence of various control modes on system performance is discussed, some reference for feed servo system performance optimization in CNC machine tool are provided.

Abstract: Aiming at high speed and accuracy position control, this paper introduces design of an optimal internal mode control and sliding mode control for rocket launcher servo systems which have large varied moment of inertia, strong impact moment and load moment. Internal mode control designed by LQR theory can satisfy system requirement of the position loop in PMSM system. Sliding mode control can restrain effects that caused by model parameter perturbation and external disturbance and realize high performance position control. Simulation results show that the control method is simple and has better performances compared with PID controller.

Abstract: The paper presents a dynamic research of a rotational module of structure to industrial robot MA 221, to establish the functional characteristics that recommend it for use in the structure of the robot. Actual research performed by two methods: BODE and STEP response of the established the construction parameters values of electro-hydraulic servo-system for stable operation.

Abstract: This paper presents some researches regarding the use of electro-hydraulic servo-systems in driving the industrial robots, taking into consideration the conditions in which the robots work. The researches conducted upon a particular system, reveal the optimum design elements for obtaining a good behaviour in use, subsequently a good stability in use.

Abstract: According to the aircraft control load power model, using electric power servo loading approach in designing the aircraft simulator electric control loading system, introduced a control loading system works as well as excess power causes. According to the direct driving torque control servo motor applied characteristics of double by force, and the compensation of hybrid control strategy. Using force is the inner loop, current loop using. At the same time as manipulate load system, we can adopt " Structure invariability principle " compensation strategies that speed compensation measures to abate force to influence on the performance of the control system. Experiment measures to eliminate that speed compensation system of plus torque, and good results have been achieved. Simulation results show that, using the hybrid control strategy can effectively eliminate the surplus torque control steady-state error, tracking precision, to force the requirements for the construction, performance control principle prototype system load provides data parameters and the control strategy.

Abstract: The ideal control effect cannot be reached using the traditional PID control in AC servo system. A PID control programme with repeat compensation has been proposed. A new control structure based on repeating compensation has been improved and embedded in the traditional PID control. Tracking accuracy and response speed of AC servo system have been improved by the new control programme. Ant cyclical interference and control performance of system were higher.

Abstract: This paper suggests a compensating method of flux fluctuations in permanent magnet of AC servo system. after analyzing the characteristics and control measures of flux fluctuations, the compensation strategy for reducing the effect of flux fluctuations on electromagnetic torque is put forward. Though the simulation experiments it is shown that the flux compensation method for improving the position control accuracy of the movers when their running at high speed is proved to be positive effective. For CNC machine tools, industrial robots and other occasions involving sophisticated movement, synchronous servo motors in permanent magnet are usually driven by high-performance sine wave. In order to obtain good control performance, the high demands are put forward for reducing the torque fluctuations Torque fluctuations are an important factor to affect the stability of low speed servo drive system, high-speed stability and precision position control. There are many factors causing torque fluctuations, in which the flux fluctuations in permanent magnet are an important one.

Abstract: In order to set up a controller of good dynamic response for the laser tracking system, special requirements of laser tracking system to its controller are analyzed in this article. One is exact position track and the other is rapid and steady speed response. The overall design strategy of the control system is put forward on the condition that the startup torque and Coulomb torque difference a lot and the system works at relative low speed (typically -10rpm to 10rpm). It is pointed out that the PWM method is effective to reduce system startup torque and increase steadiness of startup. In position loop a fuzzy PI controller is designed to decrease the position overshoot to 1.5mm and increase the smoothness of the tracking. The experimental results show that the tracking control system can accurately and rapidly follow movement of the target.