Feed assembly

It conveying units are already known, with a drive shaft and a driven from the drive shaft, rotor rotatably disposed in a pump stator. The drive shaft has a cooperating inclined sliding plane with the rotor, the rotor and its rotor axis about a drive axis of the drive shaft allows the tumbling. The rotor has at its end remote from the drive shaft a toothing, which meshes with a serration provided on the pump stator. The teeth of the rotor and the stator of the pump toothing between working spaces for conveying fluid are formed. Further magnets are provided, by means of which the drive shaft is an electric winding of a stator magnetic field in cooperation with a drivable. The magnets are integrated into the drive shaft. This requires, if the diameter of the drive shaft should not be increased, the use of very expensive permanent magnets with high magnetic energy density, in particular rare earth magnets. These magnets are not resistant to aqueous urea solution, so that such an embodiment of the feed assembly is not suitable for a urea solution application. The invention can be used with sufficient resistance to aqueous urea solution feed assembly magnets, without the diameter of the drive shaft must be increased. According to the invention is provided, that the magnets (14) on a about the drive shaft (7) rotatably mounted magnet carrier (17) are provided, the drive shaft (2) annularly surrounds the drive shaft and (2) is mechanically connected.