I need an actuator with a few mm of travel and it has to be very responsive to a very low frequency (DC 10 Hz) sine wave generated by a function generator.
I'm thinking of getting a cheap subwoofer and hooking it up to my function generator via a power amp.
- Can I use a speaker as a pseudo-linear actuator or is the speaker designed to pull back the membrane?
- Will the voice coil blow when it's used at very low frequencies with enough power to actually displace the membrane by a few mms?
The load is a PCB assembly weighing around 100 grams. I want to move that assembly up and down in a controlled way at different frequencies which I'm generating with a function generator. I also have linear stages but they are slower and noisy and I've thought about a mechanical contraption with a stepper motor and cam shaft. The actuator solution seems more attractive because I can control the motion more easily and I expect the latency to be better.