Single-sided linear induction motor (SLIM) has many advantages, such as simple structure, easy maintenance, less environmental pollution and direct drive without the translation mechanisms etc. ...However, longitudinal end effect deteriorates the performance because of the discontinuous magnetic circuit in SLIM. In this paper, the interpolating linear moving boundary method (ILMBM) in finite element method (FEM) to compute transient electromagnetic field of SLIM is developed and the longitudinal end effect of SLIM is analysed taking into account eddy currents. The paper focuses on the analysis of the eddy current in secondary plate, flux density and electromagnetic force according to current supply and speed variations. Furthermore, the result has been compared with other methods used before. It is clarified that the validity of the FEM with ILMBM by comparison of the results.
A high alloyed Vanadis4 (V4) steel was produced by spray forming process in Baosteel, and the microstructure of the as-sprayed steel and its evolution during hot rolling and annealing processes were ...characterized. It was found that the as-sprayed V4 steel has a homogeneous and fine scale microstructure with uniform dispersion of carbides. The hot rolling temperature is the key factor in controlling the evolution type, morphology, and distribution of carbides, as well as the matrix microstructure of the as-rolled steels. The optimized processing parameters for the as-sprayed V4 steel are rolling at 1,050 degrees Celsius and then annealing at 900 degrees Celsius. The microstructural evolution mechanisms during hot rolling and annealing are determined according to the microstructural analysis of the material at different stages.
Single-sided linear induction motor (SLIM) is widely used in transportation and other field in need of linear drive for their simple, firm structure and linear motion feature without the translation ...mechanism. But end effect in SLIM deteriorate the performance for the discontinuous magnetic circuit. This paper analyzes 2-D transient electromagnetic field of SLIM by finite element method (FEM). The electromagnetic field-motion coupling problem was handled by the interpolation linear movement interface method. The torque was calculated by nodal force method. The variation and correlation of eddy current and electromagnetic force with respective frequency is studied in detail as well as flux density. The changing trend of longitudinal end effect in SLIM whole operation process and the influence to dynamic characteristics of SLIM is presented. The conclusions presented in this paper can give good theoretical guidance to the control and design of linear induction motor.
EMS (Electromagnetic Suspension) type Maglev vehicles like HSST (High Speed Surface Transport) that use linear induction motors for its thrust system have been in the stage of practical application. ...With medium and low speed, they are ideal mode for urban mass transit. But many inhabitants living near the Maglev line are concerned about the environment impact. In this paper, the leakage magnetic field around the levitation electromagnet and linear induction motor at different operational conditions are calculated using the 2-D finite element method (FEM). The analysis and measured results show the maximum leakage flux density produced by the levitation electromagnets and linear induction motors are under the international safety guidelines.
Large clival meningiomas are a major surgical challenge with risks to life and permanent deficit. A 65-year-old man with a meningioma anterior to the medulla oblongata with brain stem compression was ...operated with far-lateral approach assisted by multimodal neuronavigation and neurophysiological monitoring techniques. Total resection of the tumor was achieved with no intra- or post-operative complications. This case illustrates the benefits obtained by a multimodal approach.
Single-sided linear induction motor (SLIM) has many advantages, such as simple structure, easy maintenance, less environmental pollution and direct drive without the translation of mechanisms etc. ...However, longitudinal end effect deteriorates the performance because of the discontinuous magnetic circuit in SLIM. In this paper, the 2-D transient electromagnetic field of SLIM is computed using finite element method (FEM) and a novel stator core structure by parametric analysis is proposed. The longitudinal end effect, the distribution and variation of eddy current and electromagnetic force with respective to frequency is analyzed in detail as well as flux density in air gap. Furthermore, the result has been compared with other structures in common use before. The conclusion indicates that the novel structure is helpful to could raise the utilization rate of stator core without the compensation winding and decrease the core loss of stator. These will be of positive significance to increase efficiency of linear induction motors.
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