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Structure of One-Axis Controlled Repulsive Type Magnetic Bearing System With Surface Permanent Magnets Installed and Its Levitation and Rotation Tests

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4 Author(s)
Takahisa Ohji ; $^{1}$Graduate School of Science and Engineering for Research, University of Toyama, , Toyama , Japan ; Yoshiyuki Katsuda ; Kenji Amei ; Masaaki Sakui

This paper deals with a new bearing structure of one-axis controlled repulsive type magnetic bearing system that has a motor function of a surface permanent magnet (SPM). We evaluated the magnetic bearing structures by using the 4-pole 4-segment type and 4-pole Halbach array, which were placed around cylindrical permanent magnet sets as field magnets. The comparison of magnetic flux density in the radial direction measured by finite-element analysis indicated that the Halbach array has advantages over the 4-segment type in terms of the total harmonic distortion and internal magnetic influence. Additionally, levitation and rotation tests were performed by implementing each bearing configuration in a newly developed equipment. In both bearing configurations, stable levitation at zero-power position was established and high-speed rotation up to around 16 000 rpm was achieved. As a result, the Halbach array slightly saved electric power. Its total input power to the motor was approximately 1.2 W.

Published in:

IEEE Transactions on Magnetics  (Volume:47 ,  Issue: 12 )