Patent ID: 8884572
Filing Date: 2014-11-11
Classification: G01D

Abstract:
1. A signal processor comprising: an AD converter configured to convert a periodic analog signal based on a position of a motor into a digital signal at a predetermined conversion period; a tracking circuit configured to calculate the position of the motor at an arithmetic period on the basis of the digital signal that is converted and output at the conversion period by the AD converter; an operation state identifier configured to identify an operation state of the motor on the basis of the position of the motor calculated by the tracking circuit; and an arithmetic period determiner configured to change the arithmetic period of the tracking circuit in accordance with the operation state of the motor identified by the operation state identifier such that the position of the motor calculated by the tracking circuit follows an actual position of the motor, wherein the arithmetic period determiner determines the arithmetic period to be a period equal to or less than the conversion period at which the AD converter outputs the digital signal.