Ring cap for use on commutator in miniature electric motor for absorbing electrical noise/sound
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United States of America Patent
Stats
-
Aug 8, 2006
Grant Date -
Dec 1, 2005
app pub date -
Aug 27, 2004
filing date -
May 25, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotor assembly for an electric motor, including: a rotor shaft, an armature, wire windings and a commutator, wherein the rotor assembly further includes a ring cap directly connected with the commutator. The ring cap includes chip capacitors soldered on a printed circuit board through a Surface Mount Device (SMD) technique. The ring cap serves as a reservoir for absorption of any noise/sound generated from rotation of the commutator in a DC motor around its brushes. The invention enables compliance with current and future EMC requirements in, for example, the automotive industry.
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