Abstract: The present invention relates to a stator system for an electric motor with an internal rotor. The stator system includes a stator winding and a metal external return path radially enclosing the stator winding. The external return path is surrounded by a retaining structure that holds the stator system together. The retaining structure can be injected to the external return path with plastic in the form of a cage, so that the external return path is not covered by the retaining structure in some regions but is exposed.

Abstract: An electric direct current motor is disclosed which includes a shaft, a winding support, a collector having several collector wires, and an air-cored outer rotor winding with several winding terminations. The outer rotor winding is at one end connected to the shaft via the winding support in a torque-proof manner, and is electrically connected with the collector. The winding support can be replaced by a printed circuit board as a bearing component of glass-fiber reinforced thermosetting plastics, wherein the printed circuit board includes at least one layer and is connected to the shaft via a metal hub.

Abstract: An electronically commuted electric motor with a stator and a rotor is disclosed that has permanent magnets distributed a circumferential direction to determine the magnetic field of the rotor, whereby at least one sensor makes the position or speed of the rotor recordable through direct sampling of the magnetic field of the rotor. The sensor is spaced from the stator in a way that the stator field is recorded by the sensor only to a low extent or not at all, and whereby magnetic flux-guiding elements are disposed on a front side of the rotor, which move along with the rotor and guide at least a part of the magnetic field of the rotor to the sensor. The flux-guiding elements viewed in the circumferential direction of the rotor are positioned respectively between two permanent magnets of the rotor.