To provide an insulation deterioration diagnosis device capable of identifying an insulation deteriorated axis without switching an electric path and flexibly changing the operation frequency of a motor.
An insulation deterioration diagnosis device includes: a frequency component sorting unit in which a plurality of frequency components corresponding to a plurality of angular frequencies calculated by an angular frequency calculation part for calculating the angular frequency of electric angels of a plurality of motors are sorted out from a leakage current detected by a leakage current detection part for detecting the leakage current flowing through an electric path between a plurality of motors and a power supply; an insulation deteriorated axis identification unit which identifies the insulation deteriorated axis among a plurality of axes in response to the plurality of the motors based on the current amplitude of a plurality of sorted frequency components.
| JPH08248105 | DIAGNOSTIC DEVICE FOR CONTROL VALVE DRIVEN BY STEPPER MOTOR |
| WO/1992/001944 | ELECTRICAL TEST APPARATUS |
NAGAOKA KOTARO
TANABE AKIRA
WATANABE YOSHIMASA
| JP2004184275A | 2004-07-02 | |||
| JP2010016982A | 2010-01-21 | |||
| JP2010156661A | 2010-07-15 |
| US4540922A | 1985-09-10 |