| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and method for detecting the deterioration of lubricant for a machine tool, detecting the deterioration state of the lubricant with high precision. SOLUTION: This oil deterioration detector 1 is equipped with: first and second electrodes 12A and 12B arranged in mutually opposed relationship; an electromagnet 16 for forming a magnetic field between the electrodes (12A and 12B); an AC power supply 14 for applying AC voltage across the electrodes (12A and 12B); an ammeter 18 and a voltmeter 20 for measuring the current and voltage between the electrodes (12A and 12B); and a signal processor 22 for judging the deterioration of the lubricant. The signal processor 22 calculates the conductivity and dielectric constant of the lubricant from the measuring results of the ammeter 18 and the voltmeter 20 in the state where the magnetic field and AC voltage are applied across the electrodes (12A and 12B), and determines the deterioration of the lubricant on the basis of the conductivity and dielectric constant of the lubricant. COPYRIGHT: (C)2011,JPO&INPIT |
