Papers by Author: Xu Dong Wang

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Authors: Xu Dong Wang, Bao Bao Hao, Xiao Zhuo Xu, Qing Hua Gao
Abstract: Capacitor matching in single-phase capacitor-run induction motor (SPCRIM) is investigated in this paper. Combining symmetrical components method with resultant current method, capacitor value is calculated. Relationship between turn ratio of main winding and auxiliary winding, main winding current, auxiliary winding current and capacitor value is analyzed by simulation. SPCRIM is optimized on the ground of the theoretically calculated capacitor value and turn ratio of the main and auxiliary windings with FEA (Finite Element Analysis). Results show that calculated capacitor value contributes to the determination of turn ratio of the main winding and auxiliary winding, and with appropriately calculated capacitor value and turn ratio, small winding current can be got.
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Authors: Hai Chao Feng, Xu Dong Wang, Bao Yu Xu, Xiao Zhuo Xu
Abstract: Permanent magnet linear synchronous motors (PMLSMs) is the best driving motor for rope-less hoist system because of the advantages of simple structure, small volume, high force, unlimited hoisting height and speed. In this paper, the finite element method (FEM) is adopted to design a PMLSM with 16-pole 15-slot as a unit for rope-less hoist system. Through the FEM analysis, the EMF constant Ke and the force constant Kf of unit motor were got. Then a direct driving elevator prototype drove by the proposed PMLSM was built. Experimental results show the stable operation performance of the experimental device, having good prospects for the development and application.
139
Authors: Xiao Zhuo Xu, Xiao Feng Qin, Xu Dong Wang
Abstract: A novel Detent-force-based Magnetic Suspension System (DMSS) is presented. The topological structure and operating principle of DMSS are analyzed. The characteristics of the axial, radial force and magnetic field and torsion moment are studied with FEA method respectively. Simulation results show that the DMSS can generate larger levitation force than common levitation systems, and its levitation mode is a passive suspension in the axial direction and torsion without external control.
2644
Authors: Xiao Zhuo Xu, Xu Dong Wang, Hai Chao Feng, Ji Kai Si
Abstract: This paper investigates the detent force modeling of a slotted iron core type vertical permanent magnet linear synchronous motor (PMLSM) for ropeless elevator applications. Variable network non-linear magnetic equivalent circuit model is established to predict the detent force of PMLSM. The topology structure of equivalent magnetic circuit is developed and the permeances are derived and calculated. The end effect of two end teeth is essential for analysis of detent force and it is focused in the modeling. Magnetic saturation of primary iron-core also be taken into account. In final some 3-D finite-element numerical calculation results are used to validate the feasibility of the proposed method.
148
Authors: Xu Dong Wang, Hai Chao Feng, Xiao Zhuo Xu, Bao Yu Xu
Abstract: Direct force control (DFC) with the advantages of simple structure, fast force response, superior control performance, is developed from direct torque control (DTC). So, it is attracting more attention, increasingly becoming a research hot in the control field. It is a valuable research to improve the operation stability of PMLSM by the direct force control. In this paper, based on DFC principle analysis, the force control and flux control theory of DFC is studied according to the mathematical model of PMLSM. The structure and implementation method of DFC is analyzed, and then the DFC system simulation model for PMLSM is built by Matlab/Simulink. The simulation results show the feasibility of the simulation model, with good static and dynamic performance.
692
Authors: Bao Yu Xu, Yi Lun Liu, Xu Dong Wang, Fang Dong, Zhi Cheng Kang
Abstract: The dynamic behavior of roller system of a "1+4" hot strip rolling tandem mill were analyzed. The stochastic vertical vibration and the optimum mathematical model were established based on the reliability after the system simplified to some extent. Stochastic optimum has been done to the system according to the optimum mathematical model of the roller system. Its best natural frequency and damping coefficient are obtained by computer simulation under the situation of minimum response of the rollers stationary acceleration when chatter occurs. The results indicate that by optimizing the natural frequency and damping coefficient of the system can greatly improve the dynamic behavior of rollers system and equality of the strip, and are useful to the new design of the rolling mill and the setting up of the rolling parameters.
544
Authors: Xu Dong Wang, Kai Cao, Jun Zhu, Hai Chao Feng, Xiao Zhuo Xu, Li Li Guo
Abstract: In this paper, a model of unit motor (16p15s) which is used for vertical elevator has been set up. And a modification of the primary geometry has been presented. In the new geometry, pole shoes are affixed to the primary poles. The finite element analysis (FEA) of various width of pole and different width of pole shoe have been carried out in this paper. The results show that the force profile of the proposed PMLSM has been improved. The minimum force ripple occurs in a suitable width of the pole shoes. And the back EMF constant is analyzed, too.
48
Authors: Xu Dong Wang, Hai Chao Feng, Bao Yu Xu, Xiao Zhuo Xu
Abstract: Rope-less hoist system driven by permanent magnet linear synchronous motor has the advantages of simple structure, small volume, high force, unlimited hoisting height and speed. So, it is attracting more attention, increasingly becoming a research hot and difficult in the vertical hoist field. In this paper, a design scheme of direct driving high-speed elevator is proposed according to the key technical problems of rope-less hoist system driven by PMLSM, and then a small-sized home elevator prototype is built. Experimental results show the safe and stable operation performance of the experimental device, which offers the reference for the further research and the development and application of PMLSM rope-less hoist system.
539
Authors: Bao Yu Xu, Yi Lun Liu, Xu Dong Wang, Fang Dong
Abstract: The stochastic excitation power spectral density (PSD) model and ARMA time series model are established based on the stochastic rolling force acquisition data, which is processed into stationary, normal and zero mean from a aluminum hot strip tandem mill. Characteristics of rolling force ARMA time series models are discussed by means of random process theory. The rolling forces PSD function of facilitating engineering application is obtained by utilizing Levenberg-Marquardt combined with generalized global planning algorithm, and the stochastic excitation model is established. It provides the basis for the prediction of rolling force.
378
Authors: Bao Yu Xu, Yi Lun Liu, Xu Dong Wang, Yu Qing Wang
Abstract: A two dimensional stochastic nonlinear dynamical model of rolls is presented considering the stochastic factor of the rolling force. The Hamilton function is also described as one dimension diffusion process by using stochastic average method, the singular boundary theory was taken for analyzing the global stochastic stability of the system, and the system’s stochastic stability is researched by solving the Fokker-Planck-Kolmogorov (FPK) equation. The results show that the generalized energy H in the range of 0.02 to 0.4, the system’s response has the minimum transition probability density, and the system state is not easy to change, therefore the system generalized energy H should be to limit in this range in the design and operation of the rolling mill.
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