| 摘要 |
PCT No. PCT/DE98/03175 Sec. 371 Date Jul. 16, 1999 Sec. 102(e) Date Jul. 16, 1999 PCT Filed Oct. 30, 1998 PCT Pub. No. WO99/29528 PCT Pub. Date Jun. 17, 1999An electric motor for moving or adjusting parts of vehicles such as windshield wipers and sunroofs have switching devices for shutting of the electric motor in at least one predetermined position of the movable part, for example also for shutting off the electric motors when the parts are disposed in their end positions. For this purpose, the switching devices have at least one permanent magnet that is for the actuation of switching contacts and, for example, is disposed on a switching gear, and have at least one sensor that is sensitive to magnetic fields. Different switching gears are stored for different sizes of parts to be moved. The invention sets forth a switching gear as an annular disk made of a magnetizable material, wherein the material is preferably comprised of a permanent magnet powder and a thermoplastic bonding. Such an annular disk is magnetized either in the immediate vicinity of an associated drive device or when installed in this drive device. After at least one associated sensor is installed and the drive device is closed, it is ready for installation in a vehicle. Particularly when the magnetization of the annular disk takes place when it is already installed, no adjustment of the drive device is necessary before installation into a vehicle, which permits a drive device of this kind to be produced inexpensively.
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