| 摘要 |
In a stationary electromagnet creating a multipole-nuclei dipole field for controlling the rotation around its axis of a movable element housing a permanent magnet, each of the electromagnet poles is shaped in the form of a circular arc having a corresponding opening angle from about 40 to about 110 degrees. Also the permanent magnet poles have faces shaped in the form of a circular arc, and in a preferred embodiment the permanent magnet is provided with grooves on both the pole faces, said grooves being parallel to the permanent magnet rotation axis.
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