Methods and system for determining an error and correcting the angular position of a continuous rotation motor

A system (40) for determining an error and correcting the angular position measurement of a continuous rotation motor having one or more phases (11, 12, 13), particularly a timepiece motor, the motor comprising a rotating rotor (42), characterized in that the system includes:

• a unit (41) for monitoring the back electromotive forces of the phases of the motor, the monitoring unit (41) being configured to detect each phase when the value of the back electromotive forces is zero,
• a processing unit (43) configured to store a time corresponding to each detected instant, to measure several time intervals between two instants detected in the same revolution of the motor, to perform a series of preliminary steps of defining reference intervals, to compare the measured time intervals to reference time intervals in a reference revolution of the motor in order to deduce to which reference interval they correspond, and to determine an angular position measurement error if the measured intervals do not correspond to the expected reference intervals.