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Electromagnetic Field Analysis and Modeling of a Relative Position Detection Sensor for High Speed Maglev Trains
College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China
* Author to whom correspondence should be addressed.
Received: 20 March 2012; in revised form: 4 May 2012 / Accepted: 4 May 2012 / Published: 15 May 2012
Abstract: The long stator track for high speed maglev trains has a tooth-slot structure. The sensor obtains precise relative position information for the traction system by detecting the long stator tooth-slot structure based on nondestructive detection technology. The magnetic field modeling of the sensor is a typical three-dimensional (3-D) electromagnetic problem with complex boundary conditions, and is studied semi-analytically in this paper. A second-order vector potential (SOVP) is introduced to simplify the vector field problem to a scalar field one, the solution of which can be expressed in terms of series expansions according to Multipole Theory (MT) and the New Equivalent Source (NES) method. The coefficients of the expansions are determined by the least squares method based on the boundary conditions. Then, the solution is compared to the simulation result through Finite Element Analysis (FEA). The comparison results show that the semi-analytical solution agrees approximately with the numerical solution. Finally, based on electromagnetic modeling, a difference coil structure is designed to improve the sensitivity and accuracy of the sensor.
Keywords: relative position detection sensor; electromagnetic modeling; multipole theory; new equivalent source method; second-order vector potential; difference coil structure
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Cite This Article
MDPI and ACS Style
Xue, S.; He, N.; Long, Z. Electromagnetic Field Analysis and Modeling of a Relative Position Detection Sensor for High Speed Maglev Trains. Sensors 2012, 12, 6447-6462.
Xue S, He N, Long Z. Electromagnetic Field Analysis and Modeling of a Relative Position Detection Sensor for High Speed Maglev Trains. Sensors. 2012; 12(5):6447-6462.
Xue, Song; He, Ning; Long, Zhiqiang. 2012. "Electromagnetic Field Analysis and Modeling of a Relative Position Detection Sensor for High Speed Maglev Trains." Sensors 12, no. 5: 6447-6462.