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Modeling and analysis of a magnetically levitated synchronous permanent magnet planar motor

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4 Author(s)
Baoquan Kou ; School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China ; Lu Zhang ; Liyi Li ; Zhang, Hailin

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In this paper, a new magnetically levitated synchronous permanent magnet planar motor (MLSPMPM) driven by composite-current is proposed, of which the mover is made of a copper coil array and the stator are magnets and magnetic conductor. The coil pitch τt and permanent magnet pole pitch τp satisfy the following relationship 3nτt = (3n ± 1)τp. Firstly, an analytical model of the planar motor is established, flux density distribution of the two-dimensional magnet array is obtained by solving the equations of the scalar magnetic potential. Secondly, the expressions of the electromagnetic forces induced by magnetic field and composite current are derived. To verify the analytical model and the electromagnetic forces, finite element method (FEM) is used for calculating the flux density and electromagnetic forces of the MLSPMPM. And the results from FEM are in good agreement with the results from the analytical equations. This indicates that the analytical model is reasonable.

Published in:

Journal of Applied Physics  (Volume:111 ,  Issue: 7 )