Controller for a motor that opens and closes a door, uses a memory to hold stop positions delivered by position detectors on linear motor driving door, and compares memory position with measured position to detect anomaly

摘要

The controller has a memory (9) that stores the detected (3) position of the stops (5) for the linear motor (2), and an anomaly detector (10) which obtains the difference between the output of the position detector and the initial position delivered by the memory, and gives an anomaly signal when the difference is above a preset value.