Third harmonic distortion in the current passing through a blocked short-coil, long magnetic gap type loudspeaker can be reduced by replacing the steel regions surrounding the voice coil with a polymer-based iron powder composite material. This has prompted investigation into the linear electromagnetic field distribution within the motor system, including the effects of eddy currents. The results of these investigations comprise a model for blocked coil impedance which agrees well with experimental data for at least the acoustic bandwidth of the device.
https://www.aes.org/e-lib/browse.cfm?elib=7990
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this paper!