| 摘要 |
An active type magnetic bearing for controllably supporting a rotatable shaft made of a magnetic material is constructed such that a stator made of an annular formed laminated iron core is provided around the rotatable shaft, a number of slots are formed along an internal surface of the iron core, stator windings of a number of phases are wound so as to be settled in the slots, thin sheet-like permanent magnets magnetized radially to provide a number of poles are secured onto the internal surface of the annular formed iron core with a predetermined air gap maintained between the permanent magnets and the rotatable shaft, and the stator windings of each phase are so wound that upon energization, a magnetic field thereby produced enhances a magnetic field produced by one of the permanent magnets while it reduces a magnetic field produced by another permanent magnet provided at a position 180 DEG spaced apart from that one of the permanent magnets.
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