Electrodynamic Transducers: Principles and Applications

This lecture introduces the physical phenomena behind electrodynamic transduction, describing the coupling equations linking electrical and mechanical quantities. It explores the behavior of electromagnetic transducers as actuators and sensors, emphasizing the reversible nature of electrodynamic transducers. The presentation covers the Laplace force, ribbon transducers, and the structure of voice coil transducers. It discusses methods to enhance transduction efficiency, focusing on compactness and spatial distribution of magnetic fields. The lecture also delves into the operation of electrodynamic loudspeakers as actuators and sensors, highlighting the dependence of diaphragm movement on excitation frequency and the use of oscilloscopes to observe induced voltages.