is received by a correction circuit 36 and used to initialize the value of a commutation counter 29 used to generate commutation signals 31 for the motor 12 this coarse starting position is accurate enough to ensure the stator windings are energized properly to promote the desired direction of motor rotation the starting position is then refined immediately when the correction circuit 36 first receives an u201c edge u201d of the commutation signal 27 being a switching of a commutation sensor 25 that marks a more accurate absolute position indication the incremental position signal 19 is also received by an accumulator 32 which in this embodiment is initialized at zero as the motor runs the accumulator 32 receives the incremental position signal 19 from the incremental encoder 18 and sums the magnitude and direction indicated by the incremental position signal 19 to update the synthesized absolute position 34 at this point the synthesized absolute position 34 is used for feedback servo control of the motor 12 the synthesized absolute position 34 is compared to the command signal 26 at a summing block 37 which subtracts the synthesized absolute position 34 from the command signal 26 to produce an error signal 38 this error signal 38 may be.