Advanced Materials Research Vols. 986-987

Abstract: Disruptions are highly undesired events during tokamak plasma discharge, and now massive gas injection (MGI) is the most promising technique mitigating all negative consequences of a disruption. A fast disruption mitigation valve has been designed and tested for J-TEXT tokamak based on eddy-current repulsion mechanism. In order to get the key operating parameters of the valve such as voltage and gas pressure in real time and to realize remote automatic control, a control system on LabVIEW software platform based on hardwires of sensors, relays, Advantech industrial computer and NI-6221 data acquisition card has also been designed. The experimental test results show that the control system works well.

Abstract: In view of the defects of the electric car driver motor technology, considering actual needs of the car running, relaxing the electrical power density and the limitation of the moment of inertia etc, focusing on the reliability, speed range and high efficient operation area of the motor, based on the analysis of permanent magnet brushless dc motor operation principle, this paper designed a low cost, high intelligent electric car permanent magnet brushless dc motor controller. Through the analysis, simulation, experiment and comparison, the results show that the control system has good dynamic response and steady state properties.

Abstract: . The objective of this work is to improve the control performance by redesigning the permanent magnet synchronous motor servo system .The vector control thought is used to control the permanent magnet synchronous motor. So it is easy to realize the torque current characteristic of linear. The design of the permanent magnet synchronous motor servo system is first proposed. The hardware and software designs are realized in this paper, and it is subsequently verified experimentally. Experimental results show that the DSP controller for the permanent magnet synchronous motor servo system has extensive applicability, high reliability and high performance price ratio.

Abstract: This paper introduces a new type of electric traction shearer control device based on the STM32. This kind of device is constituted by three different function modules and some peripheral modules. The different modules are interconnected through RS-485 and CAN bus. According to this paper,we make a detailed description about the structure and hardware of the shearer electrical control system, and expound the characteristics of RS-485 and CAN network communication. This electric control system can highly improve the stability and safety of the shearer.

Abstract: A stepper motor control system is designed based on the stepper motor controller and EP2C5Q208C8. The control system of the host human-computer interaction interface is designed by LabView; through RS232 to communicate with the PC. According to the characteristic of the stepper motor control system , Verilog HDL language program and the software of QuartusII are used to simulate each function modules. The analysis of simulation results and experiment show that using the method of FPGA+LabView can simplify the complexity of the system design and possess a very high stability on the running status. The motor running status can be easily observed in the PC interface.

Abstract: This paper puts forward structure and realization method of the voltage-controlled band-pass filter based on the current feedback operational amplifier (CFA) which uses bi-quad loop filter circuit model to design the new filter circuit. Input voltage signal is input to voltage-controlled band-pass filter circuit composed by an analog multiplier AD835 and a current feedback operational amplifier AD8001 which are the core. Using the voltage signal to adjust the center frequency of the filter, the filter has wide frequency band and good high-frequency performance. This paper describes the design principles, infers the design formulas and designs the circuit of the voltage-controlled first-order and second-order band-pass filter.Through the simulation, the filter can realize the scope of the center frequency from 200KHz to 10MHz.

Abstract: In order to achieve reliable drive for Permanent-magnet DC moment motor and high-precision control, we use special chips designed HIP4081 H-bridge PWM motor drive circuit bipolar reversible, with DSP as the controller completed a two-way rotation and permanent magnet DC motor speed control . Experiments show that the circuit is safe, reliable, environmental adaptability, good thermal conductivity, high efficiency, applicable to Permanent-magnet DC moment motor powered a variety of control systems.

Abstract: With the dynamic simulation tool of MATLAB named SIMULINK, modeling and simulation are made for a certain type of UAV electric servo system. Through detailed performance analysis of simulation results, the simulation experiment is confirmed to be accuracy.

Abstract: Taking CVT plug-in hybrid electric vehicle as the study subject, the objective function of the energy economy is created. In view of engine, motor efficiency and CVT efficiency coupled relationship; proposed reverse optimization algorithm to solve function. The target speed ratio of optimal energy economy is obtained in different SOC (State Of Charge), velocity, acceleration and slope. On the Matlab/Simulink platform, the system simulation model is built and simulated. The results shows that the target speed ration optimized control law in the case of no additional hardware cost , energy economy save about respectively 3.6% ,4.6%,6.7% in driving cycles of the NEDC,UDDS,HWFET before optimization.

Abstract: This paper introduces a kind of grid-connected micro-inverter system. Photovoltaic micro-inverter system is a highly nonlinear and time-varying system. Compared to traditional linear control strategy, Fuzzy Controller has better robustness and stability in the changing or non-linear application. Matlab simulation model for current tracking PV Grid-connected Micro-inverter was completed based on the Fuzzy self-tuning PI controller and the control strategy was tested on the micro-inverter prototype. The resu1ts show that this control strategy can effectively reduce the tracking error of the net current, and improve the system’s dynamic response.