Patent ID: 8692502
Filing Date: 2014-04-08
Classification: G01D

Abstract:
1. An encoder attached to an electric motor or a driven body driven by the electric motor, the encoder comprising: a detecting part adapted to detect the movement of the electric motor or the driven body; a signal processing part adapted to process a detection signal from the detecting part so as to obtain positional data of the electric motor or the driven body; and a transmitting part adapted to transmit a fluctuation component to an external equipment, the fluctuation component being determined based on positional data (P(n)) obtained from the signal processing part at regular time intervals, wherein the fluctuation component is an absolute value of a differential value (X(n)) obtained by differentiating twice or more times the positional data (P(n)) obtained by the signal processing part at regular time intervals, and wherein the fluctuation component is a moving average of an absolute value of a differential value (X(n)) obtained by differentiating twice or more times the positional data (P(n)) obtained by the signal processing part at regular time intervals in relation to past several continuous data, or a value obtained by executing a filtering process in relation to the absolute value.