Electromagnetic exciter
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United States of America Patent
Stats
-
Aug 31, 2010
Grant Date -
Nov 2, 2006
app pub date -
Apr 14, 2006
filing date -
Apr 19, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electromagnetic exciter includes a magnetic circuit assembly having an outer yoke, a magnet, and an inner yoke. A voice coil is inserted into a magnetic gap formed in the magnetic circuit assembly. A casing having a cylindrical wall is disposed around the magnetic circuit assembly. A suspension is set between a cylindrical side wall of the outer yoke and the cylindrical wall of the casing to supportingly connect the magnetic circuit assembly to the cylindrical wall of the casing. A weight is secured to the outer side surface of the side wall of the outer yoke. The suspension has an outer ring, an inner ring, and a pair of arcuate arms. Each arm is connected to the outer ring at one end thereof and connected to the inner ring at the other end thereof The arms and/or portions of the weight that face the arms are sloped so that the weight will not contact the arms when the magnetic circuit assembly is vibrated.
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