thankyou, these are all excellent responses.
betwixt:- "Brushless motors can rotate to any angle"
...i agree, but i am not sure if a Brushless DC Motor can be static at any angle and have a lot of torque to hold it at that angle(?)
It seems to me that BDCM'S and steppers are extremely similar from your answers.
...but that BDCM's can manage larger power, and higher speeds.
...there must be some very intricate way in which the windings are wound on the stator of a BDCM...such that torque is smooth as the motor rotates(?)
...this is presumably what makes BDCM's more expensive than steppers.
I also hear of the requirement to know the rotor position for a BDCM.
I dont think this applies to all BDCM's?
...i am sure a MWD (remote exploratory drills for oil discovery) Engineer was telling me his BDCM's dont have angular position feedback, because they are used in drilling, and at the end of the day, put some signals into the stator coils , and the rotor will follow them round like a "dog on a lead".....and so he said his BDCMs dont need position feedback.
It also seems to me that BDCMs are always 3-phase?