A Theoretical Analysis of Eddy-Current Effects in Loudspeaker Motors
A linear theoretical model of the electromagnetic field associated with a short-coil, long-magnet loudspeaker is developed. Results show that the resistance of the voice coil is reduced and its inductance increased by replacing the steel near the voice coil with a polymer-based magnetic powder composite. This eliminates eddy currents near the coil and is suggested as a mechanism by which the third-harmonic electromotive field in the coil is reduced. Calculated values of impedance agree well with experimental data.
Click to purchase paper 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 $20 for non-members, $5 for AES members and is free for E-Library subscribers.