Yuan Youxin

A Soft Starter of Three Phase Asynchronous Motor

This paper introduces the principle and simulation of the soft starter about the three phase asynchronous motor, due to their features of low cost, high reliability and less maintenance, the motor can start safely and easily, the lab has already done some experiments in the process of the starting and got the better effect.

Pulse Combustion Control Technology for Oxygen Atmosphere

A new combustion control method for oxygen-enriched or pure-oxygen ceramic roller kilns is proposed in this paper. This kind of roller kiln uses high-concentration oxygen or pure oxygen as the combustion-supporting medium. The new method introduces the pulse combustion control technology into the ceramic roller kiln to fine tune its oxygen-and-gas proportional regulator. This technology can greatly improve the combustion performance and thermal efficiency. It also meets the requirements of the sintering process well. This paper first analyzes the significance of this research by comparative analysis, and then discusses the configuration and implementation of the control system. Finally it gives the hardware and software design for the whole system. This system can automatically regulate the ratio of oxygen to fuel gas and the pulse combustion time of the mixed gas. In practice, it optimizes the combustion atmosphere, improves the thermal efficiency and products quality and reduces energy consumptions.

Logic Control Algorithm Based on Panboolean Algebra and Its Application for Temperature Control of Ceramic Roller Kiln

This paper describes a logic control approach for controlling the temperature of the sintering area of ceramic roller kiln. The logic control is proposed based on the theory of PanBlooean algebra. Its logic control model is represented with the sets of mathematical operation rules formed in terms of state variables of system, and the flow chart of logic control includes diagnosis, decision-making, controller and output. A novel logic control algorithm is designed. This control scheme relies on the correlation between E and EC of temperature. E means error between reference value and real temperature of the kiln, and EC means the differential coefficient of E, namely d(erro)/dt. This correlation forms the basis for development of a logic control algorithm. After that, a real-time logic controller is designed to make the output temperature of roller kiln follow the reference value closely, which selects the E and EC as feedback. Additionally, this kind of logic control method not only can effectively control the temperature of kiln without accurate mathematical models for the kiln, but also can be realized easily in engineering simply. The effectiveness and efficiency of the proposed logic control algorithm are both high. It is a kind of effective control strategy for temperature of roller kiln.

Research on Kiln Body Health Monitoring of Ceramic Roller Kiln with Oxygen-Enriched and Pure Oxygen Combustion

The ceramic roller kiln with oxygen-enriched and pure oxygen combustion (CRKOC) is proposed by authors. According to the structural feature and thermal characteristics of CRKOC, a new concept is proposed in this paper, which is the kiln body real-time health monitoring of CRKOC. Three aspects are mainly researched. Firstly, the necessity of the health monitoring on kiln is analyzed. Secondly, the superiority of using fiber grating temperature sensors to measure the temperature of kiln body is discussed. The basic principle of kiln body real-time health monitoring system based on fiber grating temperature sensors is introduced. Meanwhile, an evaluation method about real-time health status of kiln body is put forward, which is the average value law. Thirdly, the whole framework of kiln body real-time health monitoring system based on Internet is constructed, which includes four parts. The function of every part is introduced in details. Furthermore, a hardware system based on four-channel fiber grating temperature sensors is designed, and its working flow is described in details. The result shows that this kiln body real-time health monitoring system presented in this paper has the merits of early detection and early warning. Therefore, the kiln real-time health monitoring system could greatly improve the safety of the kiln body.

A Decoupling Control Method of Ceramic Roller Kiln Temperature Based on Thermal Balance

According to the characteristics of ceramic roller kiln temperature process and the implementation scheme of temperature control, we proposed a new control method of the ceramic roller kiln temperature based on thermal balance. We set the difference between the real temperature and the set-point temperature of the ceramic roller kiln as a feedback signal for each control loop. First the decoupling model was established, then we calculated the coupling coefficients of temperature between the adjacent burners with thermal balance principle, finally the temperature coupling coefficients were employed to decoupling compensate for the outputs of the corresponding PID controllers of each burner respectively. Experimental results show that the temperature coupling coefficients can eliminate the temperature coupling between the adjacent burners, and the method can achieve a satisfactory control of the internal kiln temperature process.

Design of Control and Drive System of IGBT Based on Dynamic Harmonic Filter

This is a design of a stable and reliable control and drive system of IGBT, according to the requirement of the dynamic harmonic filter. This design is centrally controlled by a 89C52 MCU and it mainly consists of 89C52 MCU, FPGA, touch screen, alarm circuit, drive and protection circuit, intelligent electrical energy sensor. It has main functions of collection of harmonic parameters of the power system, data processing and transmission, PWM generation and control and short-circuit over current protection. This system can generate a 6-group PWM pulse whose pulse width and frequency can be adjusted. It has the advantages of high precision, little interference, high flexibility and controllability. The design is successfully used in the control and drive of IGBT in the dynamic harmonic filter after its functions have been validated by simulation and it has good stability in control.

Experimental Research on Temperature Control of Ceramic Kiln Based on Rich-Oxygen and Pure-Oxygen

To verify the effectiveness of the temperature control system of the rich-oxygen and pure-oxygen ceramic kiln, an experimental research is proposed in this paper. Taking the kiln temperature as the control object, this research includes building an experimental physical model of the kiln, explaining the working principle of the temperature control system and designing its hardware and software. The result of the experiment shows that this temperature control system can make the kiln temperature follow the set value quickly and accurately. Therefore, this research lays a certain foundation for the widely application of this kind of temperature control system in the similar ceramic kiln.To verify the effectiveness of the temperature control system of the rich-oxygen and pure-oxygen ceramic kiln, an experimental research is proposed in this paper. Taking the kiln temperature as the control object, this research includes building an experimental physical model of the kiln, explaining the working principle of the temperature control system and designing its hardware and software. The result of the experiment shows that this temperature control system can make the kiln temperature follow the set value quickly and accurately. Therefore, this research lays a certain foundation for the widely application of this kind of temperature control system in the similar ceramic kiln.

Design on controller of magnetic controlled soft starting for middle-high voltage motor

PLC is used as a controller for the high-voltage motor magnetic controlled soft starting device generally. A single trigger board is required to produce trigger pulse, and a synchronous transformer is need also. It is the high cost and low reliability of the control device. A new controller of magnetic controlled soft starting for middle-high voltage is developed. Two low-performance CPU is used to improve the processor capacity and reduce hardware cost. Large plate of a circuit board structure was used to reduce the size of the controller. All input and output apply the optical coupler isolation, and output signal was tested cycle for the correctness to improve the reliability.