Advanced Materials Research Vols. 765-767

Abstract: Through the rotor-flux-oriented vector control equation and the decoupling control based on vector control method, this paper studied the design method of the flux regulator in the vector control system. The vector control system is design with flux division link, and gets in an ideal performance of timing in the matlab simulation.

Abstract: To handle the shortages of conventional PID control, recur to the high-performance digital signal processor, combine the fuzzy self-adaption controller with brushless dc motor control system. The results show the control system structure is simplified and the performances of control system are improved comparing to the conventional PID control, the performance index is better than that in conventional PID control system, so the stability of brushless dc motor operation is strengthened.

Abstract: According to motor installation mechanical sensor inconvenient problem put forward new speed identification method, from adaptive control principle and extended kalman filtering algorithm principle of the two different observer is applied to induction motor direct torque control, and analyses the research and comparison, find out their advantages and disadvantages. Using Matlab/Simulink construct the system model and the simulation, and the results show that in the load change, noise suppression, etc is better than that of EKF MARS, in the state observation, the MARS is better than that of EKF.

Abstract: The central control system, as a very important device of computer-assisted instruction, has been applied generally in all different level of schools. However, due to all kinds of reasons, teachers and teaching administrators have long experienced the inconvenience on operating the projector and screen. The main device of common CAI system consists of computer, projector and screen which can actually solve such main problems such as the projector control and the lift control of screen. Since the projector is operated most often via the remote controller in the school, and under the circumstance that teachers familiarize the equipment operation by different levels, the operation and application can be incredibly inconvenient. The central control system aims to promote the control of CAI System up to a new level in the way that changes the operating methods of operators and simplifies the operating process. For the reasons and situations listed above, a high-efficient, simplified and low-cost management and application of teaching equipment is needed, and as a result of it, we develop and design the Central Control System for Multimedia Instruction Window.

Abstract: The recent development in automatic gain control (AGC) of Er-doped fiber amplifier (EDFA) based on the electrical feedback is reviewed briefly. We introduce a AGC method which uses the adaptive PID arithmetic with feedforward to realize gain clamping by automatically optimizing. The experimental results show that the AGC scheme based on DSP has the advantages of relatively low cost ,high reliability and good flexibility due to the potential of using different arithmetic.

Abstract: A four-phase stepper motor servo control system is designed by a master chip STC89C52 and driver chip ULN2003A. Operation in four modes of stepper motor is achieved by keys. Speed control of stepper motor is achieved by A/D conversion chip TLC1549 and adjustable potentiometer. Dynamic display circuit of digital tube is designed by a shift register 74LS164. At the same time, operating in four modes, speed control and turning its particular angle of stepper motor are achieved by the infrared receiver HS0038. The experimental result shows that the control system is reliable, and it has some practical value.

Abstract: This paper analyses the working process of small vertical automatic packaging machine, the overall solution of the automatic packaging machine control system based on PLC has been put forward. The design of hardware and software structure of PLC control system has been expounded emphatically. The control system human-machine interface and control procedures flow charts have been given.

Abstract: Fuzzy control does not need to master the precise mathematical model of control object, but to determine the amount of the control object according to the control rules. This control method has a good control effect for the system with lag or random interference. It is a new attempt to treat the sewage with a PLC fuzzy controller. The control system is more reliable and it could achieve a good control effect. According to the features of the complexity of modern sewage treatment system and the difficulty of establishing accurate mathematical model, a fuzzy control method applied to the system with PLC is established and realized. The results showed that based on this method, the system is easy to realize and anti-interference ability is strong, a good adjustment quality is obtained.

Abstract: This article is about the wireless intelligent home control system design for 2.4GHz wireless communication with the central control board STM32 based on Zigbee technology, and adopting CC2430 module to form wireless sensor networks. The system consists of a main controller and multiple wireless network nodes to enable the users to easily and conveniently control and monitor the home environment and security. With advantages of easy use, simple operation, convenient networking, and good scalability, the system has good application prospects.

Abstract: Feedforward - Improve PID algorithm is an effective method of intelligent vehicle control, the algorithm not only enables the intelligent vehicle system with a good dynamic performance and speed of response, but also improves the adaptability and robustness of the system, making the intelligent vehicle able to stably operate on different runways at a faster speed. This method has good application prospect.