Patent ID: 8174155
Filing Date: 2012-05-08
Classification: G09F,H02K

Abstract:
1. A method for positioning a stepping motor to a desired position, said stepping motor comprising a rotor and a stator, said rotor having a predetermined number of poles configured according to a code to form a rotor magnetic pattern, said code having an autocorrelation function having a single maximum peak value; said rotor having an initial unknown position relative to said stator; said method comprising: driving said stator of said stepping motor in accordance with said code to form a stator magnetic pattern; sequentially and successively rotating said stator magnetic pattern through a range sufficient to align said rotor magnetic pattern with said stator magnetic pattern for at least one configuration of said stator magnetic pattern; and driving said stator of said stepping motor in accordance with said code to sequentially and successively rotate said stator magnetic pattern to position said rotor at said desired position.