US 6,982,512 B2
Interference-suppressed universal motor
Hermann Schuster, Geltendorf (Germany); Michael Reiner, Untermeitingen (Germany); and Josef Hunger, Olching (Germany)
Assigned to Hilti Aktiengesellschaft, Schaan (Liechtenstein)
Filed on Feb. 08, 2005, as Appl. No. 11/53,406.
Claims priority of application No. 10 2004 006 208 (DE), filed on Feb. 09, 2004.
Prior Publication US 2005/0174005 A1, Aug. 11, 2005
Int. Cl. H02K 11/02 (2006.01)
U.S. Cl. 310—148 6 Claims
OG exemplary drawing
 
1. A universal motor having two carbon brushes (2a, 2b) and two series connected field coils (4a, 4b), comprising an interference suppressing capacitor (5) including a first terminal (6a) connected directly to the first carbon brush (2a) and with a field coil (4a) in a conducting manner and including a second terminal (6b) connected directly to the second carbon brush (2b) and to a power line (8b) in a conducting manner, wherein the interference suppressing capacitor (5) is arranged on a brush mounting plate (9), and wherein the terminals (6a, 6b) of the interference suppressing capacitor (5) are connected to a current carrying punched grid (10) of a commutator pivot switch (7) arranged on the brush mounting plate (9).