| 摘要 |
<p>The invention provides a preventive maintenance device for an electromotor advantaged by capability of preventing error diagnosis caused by change of rotation speed or rolling load, thereby preventing sudden faults influencing whole operability of the rolling device in advance. The preventive maintenance device for the electromotor uses measurement data of specific physical quantities (radial axial translation, thrust direction translation) representing the state of the shaft of the electromotor, the measurement data of the electromotor rotation speed, and the data of drive output current input from an electromotor drive device as evaluation data for collection. Then, the collected evaluation data and an evaluation model are contrasted, thereby based on consistency of the evaluation data and the evaluation model, monitoring abnormity relative to the electromotor. As the evaluation model, a mathematical expression using a high-order function with the order higher than two and obtained by approximation of the relationship between the rotation speed and drive output current and the physical quantities representing the state of the shaft of the electromotor in rolling under the normal condition of the electromotor.</p> |
