| 摘要 |
An electromagnet thrust bearing (10) couples a rotatable member (16, 18a, 18b) relative to a stationary member (14) utilizing a combination of controllable electromagnets (24) and a radially polarized permanent magnet (32), each physically associated with the stationary member (14). The rotatable member (16, 18a, 18b) includes a shaft (16) having a pair of axially spaced apart thrust discs (18a, 18b) fixed thereto. A pair of solenoids (22) are disposed about the rotatable member (16, 18a, 18b) between the spaced apart thrust discs (18a, 18b) in oppositely facing relating to axially-facing sides of the thrust discs (18a, 18b). The solenoids (22) are capable of generating a controllable electromagnetic field. An arcuate radially polarized permanent magnet (32) is disposed between the solenoids (22) to generate a constant flux high density magnetic field (30, 34) between a solenoid housing (26) and the thrust discs (18a, 18b). A sensor (20) determines the axial positioning of the rotatable member (16, 18a, 18b) relative to the stationary member (14) and provides input for controlling the positioning of the thrust discs (18a, 18b) by varying the magnetic flux generated by the solenoids (22).
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