| US 7,482,902 B2 | ||
| Linear magnetic drive | ||
| Marcus Kampf, Berlin (Germany); and Carsten Protze, Dresden (Germany) | ||
| Assigned to Siemens Aktiengesellschaft, Munich (Germany) | ||
| Appl. No. 10/546,759 PCT Filed Jan. 27, 2004, PCT No. PCT/DE2004/000159 § 371(c)(1), (2), (4) Date Aug. 25, 2005, PCT Pub. No. WO2004/077477, PCT Pub. Date Sep. 10, 2004. |
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| Claims priority of application No. 103 09 697 (DE), filed on Feb. 26, 2003. | ||
| Prior Publication US 2006/0139135 A1, Jun. 29, 2006 | ||
| Int. Cl. H01F 7/08 (2006.01) | ||
| U.S. Cl. 335—229 [335/220; 310/32] | 8 Claims |
| 1. A linear magnetic drive, comprising:
a first coil for obtaining a current;
a first iron core passing through said first coil, said first iron core formed with at least one magnetic gap allowing a magnetic
flux to pass through said gap; and
a moveable armature including a first permanent magnet and a yoke;
said gap of said first iron core defining an edge of said first iron core;
said armature being moveable to a first limit position in which said first permanent magnet at least partially fills said
gap of said first iron core and said yoke rests on said edge of said first iron core; and
said armature being moveable in a movement direction, and said first coil producing a magnetic field passing through said
gap transversely with respect to the movement direction of said armature;
wherein said first permanent magnet provides a magnetic flux that holds said yoke when said armature is in the first limit
position.
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