1. Field of the Invention
The invention relates to an electronically commutated DC motor for a liquid pump, comprising a pump housing having a suction connection and a pressure connection, a substantially disk-shaped pump rotor mounted rotatably in the pump housing, the rotor comprising an impeller having a plurality of pump vanes and a permanent magnet, a partition separating a pump space from a dry space, wherein the partition is disposed in an axial gap between the pump rotor and a plurality of axially parallel oriented stator poles of the DC motor, which are each provided with an insulating body and a stator winding, the stator poles adjoin a stator yoke, and the stator containing the stator poles, the stator windings and the stator yoke is disposed in a motor housing made of plastic material.
2. Description of Related Art Including Information Disclosed Under 37 CFR §§1.97 and 1.98
An electronically commutated DC motor of the type in question is known from US 2010/0158724 incorporated by reference herein. It comprises a plastic housing, so that electromagnetic radiation is emitted virtually unimpaired by the stator windings.
It is known to use electric motors comprising metal housings to shield against interference. Metal housings, however, are disadvantageous with respect to noise emissions, notably structure-borne noise transmission.