| 摘要 |
Active damping oscillator including first magnetic pole portions fixed to one of an inner shaft member and an outer sleeve, second magnetic pole portions fixed to the other of the shaft member and outer sleeve, at least one permanent magnet associated with the first magnetic pole portions, and at least one coil associated with the second magnetic pole portions, and wherein the first magnetic pole portions and the second magnetic pole portions are opposed to each other in a radial direction of the shaft member with a predetermined radial gap therebetween, and are offset from each other in an axial direction of the shaft member such that the shaft member is held in a predetermined neutral axial position by first magnetic forces of the first magnetic pole portions which act between the first and second first magnetic pole portions, in a non-energized state of at least one coil, and such that the shaft member and outer sleeve are axially moved relative to each other against the first magnetic forces by second magnetic forces which are generated upon energization of the at least one coil and which act between the first and second magnetic pole portions.
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