A Passive Permanent Magnetic Bearing With Increased Axial Lift Relative to Radial Stiffness

Abstract

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A conical passive magnetic bearing with constant stiffness

“… 4 , 8 , 14 , 16 , 23 , 29 . The specific model used here has previously been used to calculate the force of passive magnetic bearings and compared with experiments with good agreement 24 . For these reasons, the results of the modeling work presented here are directly applicable to practical real-world passive magnetic bearings.…”

“…It is noted that while producing such tilted conical rings of permanents magnets can be difficult if the rings are to be one piece, the rings can easily be made of cubes of permanent magnets placed in a ring, similar to Ref. 24 .…”

“… 6 . To validate the models experimental setups for testing bearings both concentric and off-centre have been presented 7 , 24 , 30 , 39 . The design with the maximum radial stiffness has been found numerically in Ref.…”

“… 22 , by considering the air gap between rotor and stator. Optimally, a bearing configuration should provide both lift and stability, and thus concepts have been suggested with magnet placements attempting to achieve this 24 . The dynamics of the active bearing has also been investigated 12 , 31 , 32 .…”

Two Models for Time-Domain Simulation of Hybrid Magnetic Bearing’s Characteristics

“…Magnetic bearings use the magnetic field to levitate the rotor without mechanical contact. They can be classified into three groups: active magnetic bearings (AMBs) [1], passive magnetic bearings (PMBs) [2] and hybrid magnetic bearings (HMBs) [3]. Magnetic bearings constitute a viable alternative for other types of bearings due to their unique properties, such as:…”