Patent ID: 7087890
Filing Date: 2006-08-08
Classification: G01D

Abstract:
1. A rotating-body control device comprising: first phase-matching means of Z-phase detection type successively energizing a rotating body for each of a plurality of phases of the rotating body, the rotating body is rotated by the energization and resultant excitation for each of the plurality of phases, for obtaining, when a Z-phase output of an encoder detecting a rotational angle of said rotating body is rendered ON, a correspondence between a count value calculated from an output signal of said encoder and the energized phases; and second phase-matching means of Z-phase non-detection type successively energizing, when an abnormality in encoder output is detected under control by said first phase-matching means, the rotating body for each of said phases for a period of time in which said rotating body can rotate in accordance with the energized phases, for obtaining, when the rotating body is no longer energized, a correspondence between a count value calculated from an output signal of said encoder and the energized phases.