There is another guy on here who is doing this professionally, his company makes the scanners. I talked with him. All you really need is the open loop drive. A stepper motor would also work fine with a tmc2209 driver, and ideally a large heavy disk to smooth out torque ripple.
Actually, I was also wondering about this, as I work with some optics too
I think the “encoded” part is what will kill you. There are plenty of small, cheap BLDC and stepper motors on aliexpress. If you search PTZ motor you will find a great variety.
Yes, the encoder seems to be the main challenge here. I need to investigate the open loop scenario, as I’m only familiar with closed loop. I always though this kind of application is possible only with absolute positioning, but maybe the position can be calibrated with mechanical hard stops?
Maybe something like this : https://www.aliexpress.us/item/3256805252534799.html
If you are clever mechanically you could put a flag on the backside upper and lower parts of the mirror and use photointerrruptor to home it.
There are also some small motors with build-in hall sensors, that might be useful too.
Nope, no idea what they would cost. Karlito has experience with custom-ordering motors, but the problem is the MOQ will be like 500 pieces, so even if they only cost $10 you’re looking at thousands of $$$
Perhaps we can do something like a Groupon motor purchase, lol, but I fear everyone’s requirements are too different to get sizeable numbers on a single model type.
The winding scheme is U V W U V W U V W, which means all statorteeth are wound in the same direction.
For calculations I always used “drivecalc”, which can also estimate efficiency and torque curve, etc.
I’m not familiar with gearboxes, but don’t they limit the reactivity? See, my application is a portable laser projector that needs both low speed for precision steering, and high reactivity for stabilization…
Sorry, I meant responsiveness (dynamic response). I’m not sure it conflicts: I am using gimbal motors, and they allow for both precise low speed control and high responsiveness. I’m not sure other types of motor (stepper, high speed) can do that, even with a gearbox or a heavy disk (as proposed by @Anthony_Douglas)…