I would like to produce a low cost high power:weight servo drive using a brushless outrunner motor, like those use in radio control planes:
Some of these motors leak enough magnetic flux out the sides that Hall sensors can detect it. Since, this is supposed to be a low-cost design, I'd like those same Hall sensors to act as accurate position sensors, so that I can do sinusoidal current control and high resolution position control.
Question: If I set up the three current controllers to drive current proportional to the (correctly scaled and offset) outputs from the analogue Hall sensors, will this produce a smooth motion? Would I need to phase shift the Hall signals depending on the speed of the motor?
Has anyone done this before? I can't seem to find anyone publishing such a project online, which makes me wonder...