Patent · US Expired

External-rotor motor having a stationary bearing shaft

US7049718B2 · kind B2 · utility

9Cited by

13References

24Claims

0Family size

Assignee

ebm-papst St. Georgen GmbH & Co. KG · DE

Inventors

Matthis Nickel-Jetter · Villingen-Schwenningen, DE
Hermann Rappenecker · Vöhrenbach, DE
Siegfried Schreiner · Villingen-Schwenningen, DE

Key dates

Filing date	Dec 11, 2003
Grant date	May 23, 2006
Priority date	—
Expiry date	Apr 18, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH02K21/22
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An improved drum motor, preferably electronically commutated, features a unitary stationary central shaft (18) supporting a stationary inner stator (52), and an external rotor (49), including permanent magnets (50), secured to an inner surface of a generally cylindrical rotatable casing part (18). This permits variable speed operation while avoiding any need for an internal gear linkage. Safety is improved by making sealing plates (76, 78) at respective axial ends of the casing (14) stationary, and providing an annular peripheral seal (90) around each sealing plate. Respective rolling bearings (24, 44) near each end of the casing (14) facilitate rotation of the external rotor (49) relative to the stator (52), and a clamping arrangement (30) minimizes noise from the bearings.

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