| 摘要 |
The linear motor (4) has at least two permanent magnets aligned with each other and pole surfaces lying opposite at an axial distance, having same aligned polarity. Between them a soft magnetic disc with the same outer contour is inserted. Saturation induction of soft magnetic discs provide high induction, so magnetic field lines are concentrated and compressed so that in gap in area of soft magnet disk highly effective operating air gap is provided. Each shutter curtain is assigned its own electric drive motor designed as linear motor. The motor (4) has permanent magnets with the intermediate discs between them, all enclosed on all sides by a soft iron cylinder housing, the inner surface of which, with the outer casing surface of the permanent magnets and the soft magnet disc defines a ring shaped gap. The coil body is axially movable in the ring gap, which allows a working stroke between two stops, and in each of the two end positions with its winding engages over the soft magnetic disc. A drive element is provided at the coil body, for transmitting the axial movement of the coil body to the allocated shutter curtain (3). The drive element projects outward in a matched opening provided in the soft iron cylinder housing. |
