Robert Boschgmbh

Joerg Brandes

Georg Reeb

Andreas Schiel

Markus Liedel

Hans Kobschaetzky

Juergen Munz

Harald Merz

Michael Hermann

Detlef Prahl

Siegmar Schoser

Peter Froehlich

Zsolt Dudas

Tamas Banky

Michael Maelzer

Tobias Rothfuss

Markus Hartinger

Dominik Biel

Thomas Fuerst

Thilo Staier

Nizar Taghouti

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

An electric motor, including at least two permanent magnet segments disposed around a motor longitudinal axis, in which each permanent magnet segment has end faces extending in the direction of the motor longitudinal axis and is encompassed by two independent yoke ring segments that have a gap between them parallel to a symmetry plane extending through the motor longitudinal axis and the center of the permanent magnet segments in order to reduce the armature transverse field. In addition to the reduction of the armature transverse field, a weight reduction of the electric motor is also achieved. To this end, in a first region close to the end faces of the permanent magnet segments, the one-piece magnetically conductive yoke is provided with a larger cross section than in a second region close to the symmetry plane extending through the center of the permanent magnet segments. The construction is particularly suited for small electric motors, in particular d.c. motors that are excited by permanent magnets.

Electric motor

Growing community of inventors

Baden-Baden, Germany

Joerg Brandes