Patent ID: 8164224

Claim:
A magnetic device, comprising: a substrate; a movable body attached to said substrate having a rotational axis, said movable body comprising a first permanent magnet having a first magnetic field and a permanent magnetization; a switching element having a coil which can be energized or de-energized, wherein said coil is energized by rising a current through said generating a switching magnetic field which has a main component primarily perpendicular to said permanent magnetization in the region where said switching magnetic field goes through said first permanent magnet, and as a result of the volume integral of the vector-cross product of said switching magnetic field and said permanent magnetization, producing a torque on said first permanent magnet and causing said movable body to rotate about said rotational axis; wherein the rotation direction of said movable body is alternated by changing the polarity of said coil; wherein a cover is provided to protect said magnetic device.