Elektromotor mit einem Drehanker

摘要

Electrical motors known per se have rotating armatures with armatures shafts and low-friction bearing bushes, which are used to support the rotating armature on one side. The low-friction bearing bushes are commonly made of sintered steel powder and are pressed into receiving holes of stationary components, which can be made, for instance, of aluminium, magnesium or zinc and therefore display greater heat expansion when electric motors are in operation as opposed to low-friction bearing bushes. This can lead to disadvantageous press fit loosening so that torsional distorsion of the low-friction bearing bushes can not be ruled out altogether. In order to avoid this, the invention provides that the low-friction bearing bushes are profiled outwards in the shape of knurls with ribs (11) and to select the diameter of the receiving holes in such a way that they match the profile (10) so that the ribs (11) form recesses resembling longitudinal grooves in the surrounding component (8) when the low-friction bearing bushes (5) are pressed in, thereby enabling interlocking safety elements preventing torsional distorsion to arise in the peripheral direction of the low-friction bearing bushes. The invention can, for instance, be used in blowers for ventilating passenger compartments and for tempering temperature sensors, specially air conditioning regulators in said passenger compartments.