Buhler Motor Gmbh

Helmut Kellermann

Klaus Weiske

Olai Ihle

Jürgen Ehrsam

Thomas Stolpe

Christian Zimmerer

Gerhard Walter

An electric centrifugal pump having a motor housing, a pump head, a containment shell, and a rotor assembly consisting of a pump impeller and a permanent magnet rotor, wherein the pump head with the containment shell defines a wet chamber, in which the rotor assembly is arranged rotationally around a longitudinal motor axis, the containment shell with the motor housing defines a dry chamber, in which a wound stator is arranged, and the permanent magnet rotor is arranged within the stator and a hollow-cylindrical region of the containment shell. Particle accumulations in the region between the containment shell and the permanent magnet rotor cannot occur or can only occur to a very minor extent and that the consequences of impurities in the wet chamber are reduced in order to prevent premature wear or a blockage of the centrifugal pump.

Electric centrifugal pump with containment shell grooves

An electronically commutated DC motor for a liquid pump, comprising a pump housing, 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, which is connected to a metallic heat-conducting body, and the stator containing the stator poles, the stator windings, the stator yoke and the heat-conducting body is disposed in a motor housing made of plastic material. By providing that the stator is surrounded by a flexible foil, and at least a large part of the foil is disposed inside the motor housing radially around the stator windings, a simple solution ensures good shielding against interference in an existing electronically commutated DC motor, without requiring modifications to the existing design.

Electronically commutated DC motor for a liquid pump

An electric drive () with a circuit board (), having conductor tracks () and contact openings () with plated through-holes () and equipped with electronic components (), the circuit board () being coated with a protective layer () of insulating material, and press-fit contacts () are inserted into the contact openings () and in electrical contact areas () within the contact openings () electrical contact exists between a press-fit contact () and the plated through-hole () of the contact opening (). The task of the invention is to reliably protect circuit boards of electric drives exposed to moisture and other chemical environmental effects and contact them economically. This task is solved according to the invention in that the protective layer () is a parylene coating, which covers the circuit board (), the electronic components () and the surface areas of the contact openings () and circuit board () directly connected to the contact areas () between at least one press-fit contact () and at least one contact opening ().

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Langenzenn, Germany

Helmut Kellermann