edit::: fundamentally I am trying to build a "Double Buehler drive" , with the rotors arranged like those of a quadcopter.
I am considering a project that is basically a "quadcopter dean drive". ,,, the dean drive is an "impulse drive" concept that uses basically vibration rotors.
Using two rotors results in a bidirectional vibration machine, if the two rotors are synchronized and rotating opposite. ,,, My suggestion is that using 4 rotors as in a quadcopter,, the rotors would spin without any vibration at all. (stable smooth rototation).
For my project, I need to get the rotors spinning (all 4 MUST BE SYNCHRONIZED), then I would accelerate them according to the following pattern,, first, I would accelerate one pair, then during the same rotation, but during the other half of it, I would accelerate the second pair, so that by the end of each rotation, they are once again synchronized. I would do this a small number of times, and then simply end the sketch. The point of the rotation that the acceleration occurs is when the weights of the pair are moving in one direction together,,, since the second pair is rotation opposite, the second half of the same rotation they too would be moving in the same direction and together,, so acceleration of the rotors would occur only when all 4 weights are moving in one direction,, hopefully resulting in some noticeable acceleration. Of course,, the rotors are now stuck at the higher rpm, but I have more thoughts about that.
So, I need stepper motors that work fine at pretty reasonable rpms, with a fairly reasonable weight on them. I am considering those cheap elegoo ones, but if someone knows that I will wish I had good ones for consistency, I would like to ask for some relevant advice.
I made a picture with comments, and a video explaining it, if anyone is interested,, in the links. HOwever, please understand I'm not organized or well thought out, and didn't know what the dean drive was until AFTER I made these little works.
The elegoo stepper motors would give me everything I think I should need for like 20$ or so after shipping, but I don't think my experiment will be satisfactory unless I can be sure that the rotors can all be synchronized. Also, I need to have a pretty good control over the speed, and to handle a fair bit of speed.
thanks!! any comments are awesome!!