Patent · US Active

Universal motor with a device for removing dust

US7573174B2 · kind B2 · utility

3Cited by

5References

8Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Georg Braml · Landsberg, DE
Frank Fritsch · Kaufering, DE
Helmut Burger · Waiblingen, DE
Oliver Ohlendorf · Munich, DE

Key dates

Filing date	Jun 28, 2007
Grant date	Aug 11, 2009
Priority date	—
Expiry date	Sep 5, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH02K13/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A universal motor (2) includes at least two carbon brushes (36) contacting the commutator (14), a ventilation device (12) for producing a cooling flow (K), and a dust protection arrangement for preventing penetration of material particles (M) into the commutation region (34) and including at least one guide member (26) that provides for delivering of the material particles (M) in the cooling flow (K), with the at least one guide member (26) having a smooth concave guide surface (28) located between the two carbon brushes (36) and extending adjacent to an outer surface (30) of the commutator (14) and toward a suction opening (22) connected with the cooling flow path (24).

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