Below is examples of various commutation forms different driving ways of a brushless motor:
Such a motor can be BLDC or PMSM. My question is: imagine we set the motor position to a fixed stationary non moving angle so that the shaft is not rotating after it arrived to the set position. In this case(when the shaft is fixed and not moving) does that mean the voltages across the field windings will be constant? And if it is BLDC with 6 step commutation does that mean the driver can only set the position at 6 different positions or can it provide more positions by varying the voltage levels at the windings?