During the last decade, much work, both theoretical and practical, has been done on the loudspeaker diaphragm and moving system, while the motor seems to have been forgotten. This paper deals with the different distortion mechanisms in the electrodynamic motor. Some old works are reviewed, and some new are added . In order to isolate motor distortion, some measurements are carried out using force transducer attached to the voice coil. Distortion mechanisms in some typical magnet structures are described, and some proposals for improvements are given.
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