Patent ID: 9680347
Date: 2017-06-13
CPC Classifications: H02K

Claim:
1. An electric motor/gear mechanism unit comprising: a housing, an iron-free rotor winding rotatably arranged in an interior of the housing, a collector connected to the rotor winding, a rotor shaft extending through the collector, and a gear mechanism which is connected to the rotor shaft and which has an output shaft, wherein the gear mechanism is arranged in an interior of the rotor winding with an external, internally toothed annulus gear, wherein the internally toothed annulus gear is connected to the housing, wherein movable parts of the gear mechanism, including gears of the gear mechanism meshing with the internally toothed annulus gear, are produced from a non-magnetic material, and wherein a hollow permanent magnet enclosing the gear mechanism is arranged in the interior of the rotor winding and is connected to the housing, the housing and the annulus gear being formed of a magnetically soft material and forming magnetic yokes of the hollow permanent magnet.