Advanced Materials Research Vols. 383-390

Abstract: The evaluation of system efficiency for the special task or reasonableness of the business flow are usually required in the maintenance system of armored equipment. The paper analyzed the process of armored equipment maintenance system. Then a simulation model of a military maintenance process is built on Extend simulation software. By means of statistical experiments, some key results are obtained including the time in finishing the system process, queue length, waiting time and the utilization of the service platform in the process, which could provide solid evidence for evaluating the system efficiency to help make the equipment support plan.

Abstract: Arc welding technology is an important part of modern welding technology, and providing the energy of arc welding power source is welding technology at the core. The traditional arc welding power source is backward in technology and large amount of consumables, so arc welding inverter power has become the direction of its development. With the enhanced awareness of energy saving and environmental protection, this paper concentrates on new high power factor of arc welding power source as the research object, and introduces the main structure of high-power arc welding power source. At the same time, using Matlab software for modeling and simulation analysis on the main circuit and control circuit, the simulation results comply with the design requirements and verify the feasibility of the system design.

Abstract: Smart Grid is one of the hot research directions of power system. How to interconnect the new energy power generation with power system safely and reliably is a major challenge in the development of Smart Grid. New energy power generation interconnection standards are the technology base, which will push the development of smart grid. This paper compares the photovoltaic power generation interconnection standards of home and abroad mainly. It points out the inadequacy of existing standards and that the photovoltaic power generation interconnection standards should focus on power quality, protection and control. This paper can be provided as a reference to improve existing standards and establish interconnection standards of other form new energy generation.

Abstract: The paper designs a system of CAN intelligent control node which uses MCF52234 as microprocessor, focusing on describing how to implement hardware and software of CAN intelligent control node, and realized the communication between CAN control network in the intelligent control nodes and the host computer.

Abstract: Nonlinear robust controllers were proposed for permanent magnet linear servo system. In order to reach accurate track of the motor speed and current, an error system dynamic equation based on the motor nonlinear mathematical model was established. The track and disturbance suppression was summed up the design of nonlinear robust controllers. Two theories used in describing nonlinear robust controllers were obtained by defining proper storage function. The equations of nonlinear robust controllers which met disturbance suppression and asymptotical stability were proved. The results of simulation test indicate that the linear servo system with nonlinear robust controllers can guarantee disturbance suppression and the tracks of input signal.

Abstract: The paper presents a dual closed-loop vector control system based on dsPIC30F6010A for asynchronous motor which is a multi-variables, nonlinear, strong coupling and time-varying system and is difficult to determine precise mathematical model because of changes in motor parameters and load fluctuations in factors. Torque current differential Speed estimation method proposed and experiment results proved this method has satisfactory dynamic response, anti-interference ability and robustness.

Abstract: Fault tolerant flux-switching permanent magnet (FTFSPM) machine is a novel fault tolerant machine having magnet in the stator, which not only has the advantages such as excellent physical, mechanical and magnet insulation abilities, but also overcomes the disadvantages in conventional rotor-PM topology like magnets are subjected to centrifugal force and difficult to dispel heat. However, the ability to inhibit short circuit current of FTFSPM has a great impact on the machine torque (power) density. In this paper, a novel multi-tooth fault-tolerant flux-switching permanent magnet (MTFTFSPM) machine which has big self inductance is proposed. Finite element analyses (FEA) are employed to compare the electromagnetic performance of three types of fault-tolerant topology including flux-linkage, back-EMF, torque density and inductances. The results show that the MTFTFSPM machine can reach higher torque density than traditional FTFSPM due to the multi-tooth structure.

Abstract: A three phase, electrical excitation flux-switching (EEFS) brushless ac machine is proposed, its electromagnetic performance, viz., the phase flux-linkage and back-EMF waveforms, the torque density, the electromagnetic torque, and the torque-current characteristic, are evaluated based on finite element analysis. An EEFS machine exhibits sinusoidal flux-linkage and back-EMF waveforms. Compared with a hybrid excitation flux-switching (HEFS) machine, when de-excitation at fault is needed, the torque density of EEFS machine is ~20% larger than that of a HEFS machine with the same armature and field current copper loss.

Abstract: Carried on finite element analysis using the UG software to finally carry on the fatigue life’s computational method to carry on the exploration and the research. when carrying on the finite element static analysis to the piston pin, used the different analysis method, because the piston pin’s quality is very slightly oppositeing to the piston quality, produces the force of inertia is very small, the counter stress computed result is not very obvious, therefore to piston pin finite element analysis we uses conventional algorithm that infliction boundary condition.

Abstract: This paper firstly analyzed the theory of the MW wind turbine generator pitch control, and then based on the analysis, designed a servo drive system with PMSM motor-driven and double closed loop control consisted of inner speed loop and outer current loop. Finally, use MATLAB establishes the corresponding model to simulation test. Simulation results show that the servo control system has good dynamic, steady state performance and robustness.