Robert Boschgmbh

Detlef Prahl

Hartmut Nitzsche

Andreas Schiel

Juergen Munz

Josef Foerstera

Christian Aumann

Michael Hermann

Bernhard Merschroth

Dubravko Barkic

Siegmar Schoser

Joerg Brandes

Zsolt Dudas

Tobias Rothfuss

Michael Maelzer

Tamas Banky

In an electronically commutated DC motor having a stator unit () and a rotor unit () which is in the form of an external rotor, and having stationary sintered bearings (), the invention proposes that the rotor unit () is conductively connected to the shaft () in order to connect a conductive shielding, which is formed on the rotor unit (), to a defined electrical potential, and that the sintered bearing () is conductively connected to the potential, so that the shielding of the rotor unit () is capacitively coupled to the potential by means of the electrically insulating, oil-filled bearing gap which is arranged between the shaft () and the sintered bearing (). Therefore, a sliding contact is not required.

Electronically commutated DC motor with shielding

A small commutator motor ( ), in particular a blower motor for motor vehicles, has a rotor shaft ( ) rotatably mounted in at least one rotor bearing ( ) in a motor housing ( ). A commutator ( ) and an armature winding ( ) electrically connected with the commutator ( ) are arranged on the rotor shaft ( ) so as to be fixed with respect to rotation relative to it. Further, brush guides ( ) for receiving brushes ( ) held in sliding contact at the commutator ( ) and an end shield ( ) which fixes the first rotor bearing ( ) in place are provided. The end shield ( ) and the brush guides ( ) are formed as a one-piece structural component part which is a component part of the motor housing ( ) as a first motor housing part ( ).

Commutator-small power motor

A drum commutator for electrical machines has an isolating material drum and a plurality of commutator plates composed of an electrically conductive material, the commutator plates being mounted on a periphery of the isolating material drum near one another and electrically separated from one another by axial slots, each of the commutator plates being provided with a surface coating composed of carbon material and with a connecting lug for an armature winding of an electrical machine, each of the commutator plates having at least one depression at its lower side placed on the isolating material drum and being also provided with a radial passage which opens in the depression and has a reduced size relative to the depression, the carbon material of the surface coating filling the passage and the depression as a one-piece structure.

Drum commutator for electrical machines

Growing community of inventors

Buehl, Germany

Detlef Prahl