Abstract
Recently small magnetic bearing is widely requested for small rotary machines. Standard active magnetic bearing (AMB) has problems of low efficiency and temperature rise. Hybrid (HB) type AMB can improve these problems. However, the traditional HB type AMB has bias permanent magnet between the two radial magnetic bearings. This structure requires long magnetic circuit causing heavy casing and flux leakage. This paper proposes smart HB type AMB which has internal permanent magnet inside the radial magnetic bearings. The fundamental principle is introduced, followed by the design of the experimental setup.
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