I search for a stepper-, servo- or other motor and a related circuit, which is suitable to handle the following aspects:
Spinning the motor shaft by hand without (or as little as possible) friction
variable friction at the motor shaft under computational control: Rotate the motor shaft by hand with a specific rotation behavior (rotation needs less force (smoothly rotation), or rotation needs more force (hardly rotation))
motor brake / lock: Rotate the motor shaft by hand is not possible, position locked
exert a specific and directed motor force: Rotate the motor shaft with a maximum of force so that a human can not hold the shaft
I would be very pleased if anyone can give me any advice. It would be perfect if the motor size is as small as possible.
Thanks in Advance :-)