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Analysis and comparison of two-dimensional permanent-magnet arrays for planar motor

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5 Author(s)
Jiayong Cao ; Dept. of Precision Instrum. & Mechanology, Tsinghua Univ., Beijing, China ; Yu Zhu ; Jinsong Wang ; Wensheng Yin
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This paper investigates three kinds of permanent-magnet arrays used in planar motors with polarity centers distributed in the lattices of a matrix. The magnetic field of every kind of magnet array is analyzed by analytical methods. First, we give a Laplace equation of magnetic scalar potential and a series of boundary conditions. Then, we derive the analytical expressions of magnet field strength and magnet flux density in the air gap of each kind of magnet array by the method of separation of variables. Finally, we compare the three types of magnet arrays on the basis of the analytical solutions.

Published in:

IEEE Transactions on Magnetics  (Volume:40 ,  Issue: 6 )