High-efficiency and low-cost permanent magnet guideway consideration for high-Tcsuperconducting Maglev vehicle practical application

2008 ◽  
Vol 21 (11) ◽  
pp. 115018 ◽  
Author(s):  
Z Deng ◽  
J Wang ◽  
J Zheng ◽  
H Jing ◽  
Y Lu ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Low Cost ◽  
Practical Application ◽  
Permanent Magnet Guideway ◽  
Maglev Vehicle

Lateral restorable characteristics of the high-Tc superconducting maglev vehicle above the permanent magnet guideway

2009 ◽  
Vol 469 (21) ◽  
pp. 1954-1957 ◽  
Author(s):  
G.T. Ma ◽  
J.S. Wang ◽  
Q.X. Lin ◽  
M.X. Liu ◽  
Z.G. Deng ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Guideway ◽  
High Tc ◽  
Maglev Vehicle

Review of Sliding Mode Observers for Sensorless Control of Permanent Magnet Synchronous Motor Drives

2018 ◽  
Vol 9 (1) ◽  
pp. 46
Author(s):  
Ganapathy Ram ◽  
Santha K R
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
High Efficiency ◽  
Position Control ◽  
Sliding Mode ◽  
Sensorless Control ◽  
Low Cost ◽  
Permanent Magnet Synchronous Motor ◽  
Industrial Applications ◽  
Hardware Complexity

Permanent magnet synchronous motors (PMSMs) are increasingly used in high performance variable speed drives of many industrial applications. PMSM has many features, like high efficiency, compactness, high torque to inertia ratio, rapid dynamic response, simple modeling and control, and maintenance free operation. Presence of position sensors presents several disadvantages, such as reduced reliability, susceptibility to noise, additional cost and weight and increased complexity of the drive system. For these reasons, the development of alternative indirect methods for speed and position control becomes an important research topic. Advantages of sensorless control are reduced hardware complexity, low cost, reduced size, cable elimination, increased noise immunity, increased reliability and decreased maintenance. The key problem in sensorless vector control of ac drives is the accurate dynamic estimation of the stator flux vector over a wide speed range using only terminal variables (currents and voltages). The difficulty comprises state estimation at very low speeds where the fundamental excitation is low and the observer performance tends to be poor. Moreover, the noises of system and measurements are considered other main problems. This paper presents a comprehensive study of the different sliding mode observer methods of speed and position estimations for sensorless control of PMSM drives.

A facile two-step method for fabrication of plate-like WO3 photoanode under mild conditions

2014 ◽  
Vol 176 ◽  
pp. 185-197 ◽  
Author(s):  
Nan Wang ◽  
Jian Zhu ◽  
Xiaojia Zheng ◽  
Fengqiang Xiong ◽  
Baokun Huang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Large Scale ◽  
High Efficiency ◽  
Low Cost ◽  
Current Approach ◽  
Practical Application ◽  
Step Method ◽  
Mild Conditions ◽  
Energy Conversion Systems ◽  
Pec Water Splitting

Fabrication of photoelectrodes on a large-scale, with low-cost and high efficiency is a challenge for their practical application in photoelectrochemical (PEC) water splitting. In this work, a typical plate-like WO3 photoanode was fabricated with chemical etching of the as-prepared mixed tungsten–metal oxides (W–M–O, M = Cu, Zn or Al) by a reactive magnetron co-sputtering technique, which results in a greatly enhanced PEC performance for water oxidation in comparison with that obtained from a conventional magnetron sputtering method. The current approach is applicable for the fabrication of some other semiconductor photoelectrodes and is promising for the scaling up of applications for highly efficient solar energy conversion systems.

Levitation Performance of Multiple YBaCuO Blocks with Different Arrays above a Permanent Magnet Guideway

2014 ◽  
Vol 787 ◽  
pp. 431-435 ◽  
Author(s):  
Da Bo He ◽  
Jun Zheng ◽  
Yan Feng Gou ◽  
Rui Xue Sun ◽  
Tong Che ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Levitation Force ◽  
High Temperature Superconductors ◽  
Utilization Rate ◽  
Permanent Magnet Guideway ◽  
Array Pattern ◽  
Maglev Vehicle ◽  
Levitation Performance ◽  
And Performance

Bulk high temperature superconductors are usually used as arrays due to the limited size and performance of a single bulk. To find a reasonable array pattern for the superconducting maglev vehicle, we studied the levitation force of four multi-seeded rectangular YBaCuO blocks with three possible arrays above a permanent magnet guideway (PMG). Experimental results show that the levitation force can be improved through an optimal array pattern of the bulk superconductor. The method is to avoid the joint gaps of bulk arrays in a strong magnetic field area of the PMG thus improving the utilization rate of the applied magnetic field. The optimal array pattern will be helpful to improve the levitation performance and reduce the quantity of onboard superconductors.

Finishing Clearance Research on Magnetic Abrasive Finishing

2010 ◽  
Vol 97-101 ◽  
pp. 4116-4119
Author(s):  
Hong Ling Chen ◽  
Wen Hui Li ◽  
Sheng Qiang Yang ◽  
Shi Chun Yang
Keyword(s):  
Main Parameter ◽  
High Efficiency ◽  
Low Cost ◽  
Surface Finishing ◽  
Practical Application ◽  
Filling Volume ◽  
Magnetic Abrasive Finishing ◽  
Parameters Selection ◽  
Abrasive Finishing

As a kind of precise surface finishing technology, magnetic abrasive finishing has wide application, low cost, high efficiency, good effects, and other advantages. Finishing clearance is one main parameter affecting finishing effect and efficiency of magnetic abrasive finishing. Affecting rules of finishing clearance and filling volume are discussed by experiments, which provide basis for parameters selection and practical application of magnetic abrasive finishing.

scholarly journals Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2781 ◽  
Author(s):  
Noman Ullah ◽  
Abdul Basit ◽  
Faisal Khan ◽  
Wasiq Ullah ◽  
Mohsin Shahzad ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Thrust Force ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Geometric Optimization ◽  
Force Density ◽  
Permanent Magnet Machines ◽  
Force Ripple ◽  
Long Stroke

Double sided linear flux switching permanent magnet machines (DSLFSPMMs) exhibit high thrust force density, high efficiency, low cost and robust double salient secondary (stator) structures. The aforementioned unique features make DSLFSPMM suitable for long stroke applications. However, distorted flux linkage waveforms and high detent forces can exaggerate thrust force ripples and reduce their applicability in many areas. In order to enhance thrust force performance, reduce thrust force ripple ratio and total harmonic distortion (THD) of no-load flux linkages, two structure-based advancements are introduced in this work, i.e., asynchronous mover slot and stator tooth displacement technique (AMSSTDT) and the addition of an active permanent magnet end slot (APMES). Furthermore, single variable geometric optimization (SVGO) is carried out by the finite element method (FEM).

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