To strengthen the collection of information in course of experiment teaching for students,it can provide important bases of laboratory construction and experiment reform,avoid blind construction and reform,improve experiment teaching effect and quality,and train more and better talent with high quality.
A practical status is inefficient when the claw-pole alternator is widely used at present for automobile application, and the severe leakage is the main cause of it. A hybrid excitation rotor is put forward in this paper. Modeling and optimization for hybrid excitation claw-pole alternator are studied by considering permanent magnets together with its original structure. Nonparametric modeling is introduced to reduce calculation cost. The purpose of minimizing leakage is gained by nonparametric model and intelligent optimal arithmetic. The correctness of the theoretic analysis is validated by the examination of hybrid excitation claw-pole alternator with homemade test-bed.
Two methods to minimization of the cogging torque in low-speed permanent magnet wind power generator are presented in this paper. The methods are optimizing the magnet pole arc and optimizing slot/pole matching. A simple original model of the cogging torque mechanism and a Fourier analysis are proposed. The methods are applied to design low-speed permanent magnet wind power generator and their performance are calculated by finite element analysis (FEA).
Exploiting wind energy resource is of great significance in improving energy structure. Fundamental electromagnetic design and optimal design on the low-speed permanent magnet generator are presented in this paper. The fundamental electromagnetic design concludes: stator core design, stator winding design, permanent magnet of the rotor design, root of the rotor design, etc. Fractional windings are utilized to effectively decrease drag torque. Tile-poles and radial structure of rare earth permanent magnet are utilized to decrease leakage flux. Design analysis is an important step for modern motors and systems. These include: how to select the material of the permanent magnet, pole design of the permanent magnet, volume estimate of the permanent magnet, feasibility analysis of the design sheet, etc. Optimal design is base on the fundamental electromagnetic design. The optimization algorithm based on Chaos is used to gain maximal output efficiency of the wind generator. Based on a feasible electromagnetic project, optimal designs are gained by whole and local chaos optimization.
Objective To discuss the implementation range ,implementation method and the effect of hospital information system used in nursing management. Methods To compare it before and after two mouths' training and one-year clinical implementafion. Results The hospital information system has good effect on the nursing management. Conclusion With the implementation of hospital information the nursing management will be informationalized, which improves the whole nursing quality effectively.
Renewable energy sources, especially wind turbine generators, are considered as important generation alternatives in electric power systems due to their no exhausted nature and benign environmental effects. Compared to conventional synchronous generator, permanent magnet synchronous generator has many outstanding performances. Due to the technical and economical advantages, low-speed permanent magnet synchronous generators are becoming more attractive for wind power generation. They are directly drived by the wind, and economize the gear as an additional mechanical component. The low-speed permanent magnet wind power generator is introduced in this paper, and parameter analyzing is made to deduce the inherent relationship between the structure parameters and the performance, which is the fundament of parameter optimization.
Cogging torque in permanent-magnet motors is one of the most important problems to be considered in high performance applications especially in low speed and direct drive applications. In this paper, the analytical expression for cogging torque in permanent-magnet synchronous motors (PMSM) with auxiliary teeth is derived by the energy method and the Fourier series analysis, based on the air gap permeance and the flux density distribution in an equivalent slotless machine. Analytical method was proposed to determine an appropriate scope of auxiliary tooth width. In order to reduce cogging torque to the maximum extent, cogging torque corresponding to different slot openings was analyzed. To determine the auxiliary teeth width accurately, finite element method (FEM) which considered the effects of flux leakage and saturation was proposed. And then on this basis auxiliary teeth height was determined by analyzing the distribution of the radial component of the flux density in the air gap. Finally, calculation results of cogging torque corresponding to different distributions of the auxiliary teeth, the auxiliary teeth width as well as the auxiliary height were discussed.
Strengthening scientific and reasonable layout of laboratory buildings in universities is important to resources saving and efficiency improving. This paper puts forward some suggestions on how to make better use of laboratory buildings.
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