Patent · US Active

Mixed flow fan

US8974199B2 · kind B2 · utility

7Cited by

6References

24Claims

0Family size

Assignee

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

Inventors

Harald Schmid · Bietigheim-Bissingen, DE
Tobias Maier · Hirrlingen, DE
Martin Mueller · Seewald, DE
Matthias Weiss · Hilchenbach, DE

Key dates

Filing date	Nov 10, 2011
Grant date	Mar 10, 2015
Priority date	—
Expiry date	Aug 9, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG01M1/32
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A mixed-flow fan features a housing (42); an impeller (43) journaled rotatably with respect to the housing, and equipped with fan blades (54); a generally cylindrical air conduit (50) defined between the fan housing and the impeller, the fan blades extending into the air conduit in order, during operation, to transport air; an external-rotor motor (75) having an internal stator (100) and an external rotor (81) which includes a tubular ferromagnetic yoke (63) partly embedded in material of the impeller. A cup-shaped yoke (72) fits into a central cavity (68) of the tubular yoke (63) and accommodates a permanent magnet arrangement (66) which interacts with the stator. The tubular yoke (63) and the cup-shaped yoke (72) together serve as a magnetic return path for the external-rotor motor. The structure minimizes damage during final assembly, and simplifies insertion of balancing weights.

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