| 摘要 |
A magnetic circuit is provided which includes: a bottom yoke; a center pole disposed at the center of the front of the bottom yoke; a main magnet having a ring shape and disposed at the front of the bottom yoke; a top plate having a ring shape and disposed at the front of the main magnet; a repulsion magnet disposed at the rear of the bottom yoke; and a yoke cover disposed to cover the rear and side of the repulsion magnet, wherein the yoke cover has an outer diameter dimensioned equal to or smaller than the outer diameter of the main magnet, whereby the magnetic flux density at the air gap g can be enhanced. Thus, the magnetic circuit described above achieves an excellent magnetic efficiency.
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