Advanced Materials Research Vols. 694-697

Abstract: The optical power penalty (OPP) due to the artificial light interference (ALI) can influence the performance of the Visible Light Communications (VLC) system significantly. In this paper, a de-noising scheme based on band-pass filter is achieved in a voice-transmission VLC experiment system and it was proved a effective scheme to improve the quality of the transmission significantly

Abstract: For the use of Static Var Generator (SVG) in dynamic reactive power compensation of low voltage field, this paper proposes a reactive current control strategy suitable for single-phase bridge voltage source SVG and gives the main control circuit of this control method. The experimental results verify the effectiveness and practicality of this control strategy and the circuit design.

Abstract: A new type of intelligent hanger was designed. Wings structure of hanger mechanical part was adopted,screw rod and motor combination of the lifting mechanism can make the wings outspread and fold, unique cover curtain structure was adopted. Cover curtain roll up and down through the motor driving.The control system adopts AT89C51 single-chip microcomputer. According to the information that coming from the rain sensor and the temperature sensor, two stepper motor’s positive and negative rotational motion was controlled.So as to realize automatic adjustment when it rains. The hanger will be automatically closed when the temperature is higher than expectation, and the hanger will be automatically opened when the temperature is less than expectation.The hanger has been produced and has a good performance.

Abstract: In this paper, based on the nonlinear state feedback decoupling method, the dynamic transfer function of the inductor motor and pump control motor is setup, and the variable frequency hydraulic control system is realized to solve the contradiction between efficiency and dynamic characteristics using traditional control method. The simulation results show that this system has the better dynamic performance than VCS (Vector Control System). Then in order to optimize the system, the dynamic mathematical model including iron losses is built from the aspect of energy transmission. At last the condition of minimum loss of the system is deduced.

Abstract: Anti-lock braking systems (ABS) is a type of mechanical electrical system in which are used to prevent wheel locking of vehicle as a result of excessive actuation of the service braking system, especially on slippery roads. According to electric control unit (ECU) research requirement of ABS system, this paper introduce a hardware-in-the-loop simulation (HILS) test bench, which can through open and close loop test methods accomplish calibration the parameters of the inside ECU, performance evaluation and fault diagnosis and tolerance test, not only can shorten the development cycle, but also save research and development costs of ECU.

Abstract: This article has introduced a new electric eddy current retarder by reducing radial size and increasing axial size of the eddy current retarder to meet working condition tailpipe emission monitoring.

Abstract: Motion control technology has become the key technology of mechatronics. This paper first introduces the general scheme of motion control technology, through the practical application of the system needs analysis, the development of specific technical implementations.

Abstract: There are two classic strategy for AC motor control, they are vector control and direct torque control. In this paper, a new closed-loop control method based on vector control is proposed. We first introduce the basic formula of the J-M transform strategy. Secondly, the control block diagram of closed loop control based on J-M transform is analyzed in detail. Finally, the results of simulation are carried out. The simulation results show that the method of closed loop control based on J-M transform strategy can control AC motor effectively.

Abstract: In view of the current situation of the stereoscopic parking system for the electric vehicles and its overall development trend, we first research on its key module technology. Then, we research on its internal dynamic management pattern, the application mode of radio frequency identification (RFID), the application mode of charge management system and the application mode of control system. Thus, the popularity of electric vehicles is promoted by the stereoscopic parking system with intelligence, efficiency and saving of storage space.

Abstract: Soft ferrite has the characteristics of high permeability, high resistivity, low loss. Based on this, a new flux-weakening structure of high-speed permanent magnet motor was presented. The structure relies on changing the saturation of soft magnetic ferrite to change the equivalent magnetic resistance of permanent magnet magnetic circuit in the motor, so the main flux of the permanent magnet motor can be reduced. By the 3D Finite Element analyses, the magnetic field distribution characters in the air gap can be pointed out. The analysis results prove the flux-weakening method is presented in this paper is correct and feasible. It can provide a practical flux-weakening method of the high-speed PM motor.