An accurate means for measuring the magnetic flux density of moving coil loudspeakers is critically important. The paper presents a new measurement technique by scanning flux density on a cylindrical surface within and outside the magnetic gap using a Hall sensor combined with robotics to move the sensor. Scanning the magnet field on the circumference of the gap seems to be the only way for detecting axial asymmetries and other magnetic field irregularities caused by material inhomogeneity and manufacturing failures, such as partial magnetization and incorrect adjustment of the parts. Variation of magnetic field in the gap reveals an asymmetrical driving force that causes rocking modes and voice coil rubbing.
Affiliation: KLIPPEL GmbH, Dresden, Germany
JAES Volume 60 Issue 6 pp. 452-458; June 2012
Publication Date: July 9, 2012
No AES members have commented on this report yet.
If you are not yet an AES member and have something important to say about this report then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.