As I was describing yesterday, I mentioned that the Ole Wolff driver that I had considered for this exercise had a 3D model file made available on their website. However, this model is quite abstracted with many of the details, like for example, the voice coil, the magnetic gap and the magnet are all merged into one solid. Hence, none of the details or dimensions of the structure have been made visible in the model they have shared. These details are important for developing the acoustics section of the driver’s lumped model since acoustic losses and mass /compliance like behavior are modelled by taking into account the physical dimensions of these structures. As I progress with this project, I will think of ways to at least approximately decipher these details from the (only) official CAD model of the driver that is available.
Meanwhile for the sake of explanation of the concept and my modelling approach, I need a model with more details clearly visible. So, I thought, I would spend a few hours today evening building from scratch, a generic CAD model of a typical micro-speaker driver that is similar to the Ole Wolff driver in consideration. The featured image of this post is the outcome of this exercise. I’m super glad that it turned out to be way nicer than I had imagined. 😉 I managed to include all of the essential details that I could think of, that which you typically find in drivers like these, like the magnet assembly, the central venting hole in the magnet system, the voice coil, the magnetic gap in which the voice coil operates, the venting holes, the acoustic tuning mesh, etc. I modelled the diaphragm as a transparent polycarbonate material to give it a nice touch, so that the innards are clearly visible. 😉
This whole exercise took up all my scheduled time for tonight, for this project and I haven’t been able to do anything else. So that’s it for tonight. I will continue with breaking down each of the elements that I will be taking into account for modelling and how they would be modelled in the upcoming posts. Until then…
