Re: DIY Rotary Woofer
ok, it looks like they use a voice coil mounted in between the motor and the rotor to control the blade pitch. I think I could make the linkage, fans, and hook up the motor but I don't know about the voice coil as I've never taken one apart. My questions(and possible deal breakers) are:
1. Would a voice coil taken from a large speaker be able to exert the force required to move the blades? This will exert more back pressure on the coil than just a cone and I wouldn't want to design and build everything it just to find that I would need a high powered custom voice coil that would be inhibitavely expensive.
2. In order to mount the voice coil directly in between the motor and the rotor, you would need to run the shaft directly through the center of the coil. Has anyone ever tried to drill a hole through a speaker magnet?
Another option that might be a little easier would be to mount the voice coil on the rotor itself. You'd need a slightly bigger motor since you now have more mass to rotate, an it would probably take longer to turn on, but since the rotor spins at a constant speed, this shouldn't really cause a problem. In fact, it might help even out the rotational speed of the rotor as it would have more mass.