Patent · US Expired

External rotor motor

US7166940B2 · kind B2 · utility

3Cited by

6References

22Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Andreas Ewert · Lichtenau, DE
Markus Liedel · Pegnitz, DE
William M. Stevens · Oroville, US

Key dates

Filing date	Feb 11, 2004
Grant date	Jan 23, 2007
Priority date	—
Expiry date	Feb 11, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/2131
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An external rotor motor is disclosed, which features a stator (11) and a rotor (13) surrounding the stator (11) while leaving an air gap. A damper (16) made of an elastic material is arranged on the outside of the rotor (13) in order to dampen resonant rises in airborne sound, which is emitted by the rotor of the external rotor motor and by an assembly coupled to it. In the case of a rotor (13) that is designed to be pot-shaped, the damper (16) is preferably embodied as a damping cap (17), which surrounds the pot jacket (132) and at least partially covers the pot base (131) (FIG. 1).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.