Fault Data Mining on the Encoders in Numeric Control System Based on the Information Redundancy of Velocity

In order to arising the safety and reliability of numerical control system, aiming at the conventionally used encoders in the system as the equipment of feedback in position-loop, the data mining of its fault is analyzed. Benefiting from the reluctant information of velocity in the normal servo system, the principal component analysis is introduced to solving the fault of losing codes and pausing codes in the encoder. At the same time, the basic principles and flow process are presented. In order to validate the effectiveness of the mining way based on the software of Matlab, simulation shows that it can perform a very exact diagnosis at the time of fault occurring. This idea provides a believable way for the fault data mining in numeric control system.