NDLI: An electromagnetically actuated microspeaker with fully-integrated wax-bonded Nd-Fe-B micromagnets for hearing aid applications

Content Provider	IEEE Xplore Digital Library
Author	Sang-Soo Je Naigang Wang Brown, H.C. Arnold, D.P. Junseok Chae
Copyright Year	2009
Description	Author affiliation: University of Florida, Department of Electrical and Computer Engineering, Gainesville, 32611, USA (Naigang Wang; Arnold, D.P.) \|\| Arizona State University, Department of Electrical Engineering, Tempe, 85287, USA (Sang-Soo Je; Brown, H.C.; Junseok Chae)
Abstract	We present a fully-integrated, electromagnetically actuated microspeaker intended for hearing aid applications. The microspeaker uses the Lorentz force to actuate multi-turn, multi-layer copper coils embedded in a 3-mm-diameter parylene diaphragm. Process-compatible micromachined permanent magnets are employed for size reduction and batch-manufacturability. The permanent magnets are composed of micro-size Nd-Fe-B particles in a wax binder. The microspeaker produces 0.64 µm peak displacement at 1 kHz for a drive current of 88 mA (6 Ω coil impedance), corresponding to a 46 mW power consumption.
Starting Page	885
Ending Page	888
File Size	1204312
Page Count	4
File Format	PDF
ISBN	9781424441907
e-ISBN	9781424441938
DOI	10.1109/SENSOR.2009.5285873
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Auditory system Coils Loudspeakers Soft magnetic materials Permanent magnets Magnetostatics Power generation Magnetic flux Energy consumption Costs micromagnets MEMS microspeaker hearing aids Nd-Fe-B permanent magnet
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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