Rotating electrical machine

US9621010B2 · kind B2 · utility

Assignee

• ebm-papst Mulfingen GmbH & Co. KG · DE

Inventors

• Reinhard Stillger · Bobingen, DE
• Christian Pfaff · Künzelsau, DE
• Jens Krotsch · Niederstetten, DE
• Martin Baun · Mulfingen, DE
• Martin Baer · Mulfingen, DE
• Tobias Ehmann · Neuenstein, DE
• Mark A. Heinze · Tecumseh, CA
• Reinhold Gerner · Ravenstein, DE
• Christian Hammel · Neuenstein, DE

Key dates

• Filing date: Sep 12, 2012
• Grant date: Apr 11, 2017
• Expiry date: Aug 20, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K9/227
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A rotating electric machine (1) having a stator (4) in a housing (2) and a rotor (10) supported by a shaft (6). The housing (2) circumferential wall (12) and first and second axially opposing end walls (14, 16) support bearing flanges with bearings (18) for the shaft (6). Two cooling fan impellers (20, 22) are connected to the shaft (6). An inner cooling fan impeller (20) positioned inside the housing (2) generates an inner cooling air circuit (A) inside the housing (2). An outer cooling fan impeller (22) provided outside the housing (2), generates an outer cooling air flow (B). The first end wall (14) is formed with a thermal conductivity of at least a specified value and has an outer cooling rib geometry (28) on its outer side facing the outer cooling fan impeller (22), and an inner cooling rib geometry (30) on its opposing inner side.