Hi, I need a motor with no torque to speak of - the load will have so much less mass than the shaft that for all intents and purposes there will be no load at all. The motor must run continuously at anywhere from 600rpm to at least 5000 rpm and hopefully as fast as 12000 rpm (‘200hz’) - nothing fancier than steady smooth rotation. The shaft rotation/ angle needs to be predictable/ electronically controlled (a few seconds of ‘catching up’ at the start would be acceptable) and the shaft needs to come to a controllable shaft angle stop. Shaft angle could be sloppy up to 20 degrees or so. So minimal strength and precision and this needs to translate into small and inexpensive.
I cannot find anything that fits the bill in the servo, stepper or synchro categories. Steppers don’t go fast enough, synchro shaft angles aren’t controlled, and as I understand it most (all?) servos that are continuous-rotation are not feedback controlled. Any advice is highly appreciated.