Electronically commutated DC motor with shielding

US9673686B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Tobias Rothfuss · Laufenburg (Baden), DE
• Michael Maelzer · Reutlingen, DE
• Juergen Munz · Leinfelden, DE
• Michael Hermann · Tacherting, DE
• Detlef Prahl · Laufenburg (Baden), DE
• Siegmar Schoser · Tübingen, DE
• Joerg Brandes · Baden-Baden, DE
• Andreas Schiel · Enzklösterle, DE
• Tamas Banky · Páty, HU
• Zsolt Dudas · Dombóvár, HU

Key dates

• Filing date: Apr 29, 2013
• Grant date: Jun 6, 2017
• Expiry date: Jan 2, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K11/40
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

In an electronically commutated DC motor having a stator unit (5) and a rotor unit (1) which is in the form of an external rotor, and having stationary sintered bearings (8, 9), the invention proposes that the rotor unit (1) is conductively connected to the shaft (3) in order to connect a conductive shielding, which is formed on the rotor unit (1), to a defined electrical potential, and that the sintered bearing (8, 9) is conductively connected to the potential, so that the shielding of the rotor unit (1) is capacitively coupled to the potential by means of the electrically insulating, oil-filled bearing gap which is arranged between the shaft (3) and the sintered bearing (8, 9). Therefore, a sliding contact is not required.