Patent · US Expired

Brushless DC drive motor with external rotor for use in disc drives and like devices

US5382853A · kind A · utility

39Cited by

6References

28Claims

0Family size

Assignee

Papst Licensing GmbH · DE

Inventors

Johann von der Heide · Winterthur, CH
Rolf Muller · St. Georgen, DE
Alfred Merkle · St. Georgen, DE

Key dates

Filing date	Oct 3, 1990
Grant date	Jan 17, 1995
Priority date	—
Expiry date	Oct 3, 2010

Classification

Technology area (CPC H)Electricity
CPC primaryH02K3/28
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A brushless DC drive motor with an external rotor has three pole shoes on a substantially ring-shaped stator for each two poles on the rotor. The stator winding is commutated by a three-phase commutation network in such a fashion that first, second and third networks in the stator winding are cyclically connected to an external DC source in accordance with rotor position. Each of the networks comprises at least one stator coil wrapped around a neck of a single corresponding one of the pole shoes.

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