Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2011-08-30
2011-08-30
Nguyen, Tuan D (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S401000, C381S412000
Reexamination Certificate
active
08009857
ABSTRACT:
An audio loudspeaker having an induction motor whose yoke components are formed of powdered iron or other material which is highly magnetically permeable and highly electrically resistive. The oscillating magnetic flux caused by the alternating current applied to the primary coil induces eddy currents in the shorted turn secondary coil but not in the yoke components. This reduces heating of the yoke components, reduces flux modulation, and reduces wasted power.
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Bohlender Jack T.
Graebener David J.
Michno David J.
Smith Robert M.
Stompler Thilo Christian
Calderwood Richard
Nguyen Tuan D
Wisdom Audio Corp.
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