Abstract
To satisfy the requirement on low-power magnetic bearings of magnetically-suspended-flywheel(MSFW) with flat rotor applied in spacecraft,a class of radial permanent-magnet-biased magnetic bearing(RPMB),named thimble-RPMB,is presented.It is homopolar,so it has low rotational loss.Its poles have short axial length and flexible pole-arrangement,because its working gaps distribute along two concentric circles in only one layer,and radial magnetic forces are concurrent in one plane.According to different requirements of completely-active MSFW and 2-axis-active MSFW,3 species of thimble-RPMB are analyzed and designed,namely,pole-aligned,pole-interlaced and pole-biased,by the equivalent-magnetic-circuit method and FEA simulation.The designed completely-active MSFW has short axial length,light weight,and high precision.The optimally designed 2-axis-active MSFW has high passive stiffness,high current stiffness,and high stability of current stiffness.
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