Coding system with the function to detect anomalies and anomaly detection methods

摘要

There is a problem that it is difficult to clarify whether the reason for the occurrence of an anomaly is found within the encoder or is found in the communication path between the encoder and the control unit. An encoding system includes an encoder that outputs position data and magnetic pole data to an output shaft of an engine; and a control unit that communicates with the coder wirelessly or wirelessly, wherein the coder detects a position data generating circuit, a magnetic pole data generating circuit, a first data abnormality detection circuit that detects the presence or absence of abnormality based on the position data and the magnetic pole data, and outputs a first alarm signal, and a parallel A serial conversion circuit that outputs the position data, the magnetic pole data, and the first alarm signal to the control unit, and the control unit includes a second data abnormality detection circuit that detects the presence or absence of an abnormality based on the position data and magnetic pole data and outputs a second alarm signal; and a communication abnormality detection unit that detects the presence or absence of an abnormality in the communication path based on the first alarm signal and the second alarm signal.