| 摘要 |
A magnetic bearing includes a pair of coaxial, toroidal, permanent magnets having axially directed poles. Like poles of the permanent magnets are adjacent each other, whereby the permanent magnets have a tendency to be urged apart along the common axis thereof. An electromagnet is wound coaxially with the permanent magnets in such a manner that the poles thereof are axially directed. Between the poles of each permanent magnet there is a low magnetic reluctance circuit including two series air gaps. Between the poles of the electromagnet a low reluctance path including only one air gap of each of the low magnetic reluctance circuits is provided. The low reluctance path for the electromagnet includes a ring axially translatable relative to the permanent magnets. The ring forms opposite faces of the air gaps in the magnetic circuits for each permanent magnet.
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