Affiliations: School of Instrument Science and Opto-electronics Engineering, Beihang University, Beijing, China
Correspondence:
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Corresponding author: Huijun Wang, School of Instrument Science and Opto-electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China. Tel.: +86 15210145640; E-mail:huijun024@gmail.com
Abstract: In this paper, a new type of E-Core permanent magnet biased radial
magnetic bearing with low coupling and high utilization of the stator space
is proposed. In the structure, eight permanent magnets are used to provide
the bias magnetic field. Two pairs of coils are used to provide control
flux. The stator pole of one direction consists of one main pole and two
secondary poles, which is called E-Core magnetic poles. Firstly, basic
structure and operation principle of the novel magnetic bearing are
introduced. Moreover, based on simplified equivalent magnetic circuits, the
mathematic magnetic circuit models, which are for biased flux from permanent
magnet and control flux from control coils, are established. In the
meanwhile, the basic characteristics such as force with respect to the
eccentric displacement and current, coupling between X- and Y-channel are
deeply analyzed. Finally, according to the analysis results it can be shown
that proposed E-Core magnetic bearing has some advantages such as high
stiffness and low coupling between two channels, which is good for realizing
the high precision control.
Keywords: Magnetic bearing, permanent magnet, coupling
