Electronically commutated DC motor for a liquid pump

US8920143B2 · kind B2 · utility

Assignee

• Buhler Motor GmbH · DE

Inventors

• Thomas Stolpe · Eckental, DE
• Helmut Kellermann · Oberschleißheim, DE
• Olai Ihle · Eckental, DE
• Gerhard Walter · Hamburg, DE
• Klaus Weiske · Altdorf, DE

Key dates

• Filing date: Aug 16, 2011
• Grant date: Dec 30, 2014
• Expiry date: May 10, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K5/225
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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.