| 摘要 |
Short-circuit diagnosis devices for electric motor stator windings have had a problem wherein because calculation parameters are influenced by load torque fluctuation, power imbalance, and contact failure, it is difficult to correctly and highly accurately detect a winding short-circuit. The present invention is provided with a logical operation unit (10) that receives the output of a current detection circuit (9) for detecting the current of an electric motor (6) and a voltage detection circuit (8) for detecting the voltage of the electric motor (6) and a display unit (13) and external output unit (15) for respectively providing an abnormality indication and external notification when the logical operation unit (10) detects an abnormality in the electric motor. Through voltage and current analysis of the electric motor, the logical operation unit (10) distinguishes power supply imbalance and identifies and detects a winding short circuit on the basis of reverse-phase current, reverse-phase voltage, positive-phase current, and reverse phase admittance even if a load torque varies while the electric motor is operating. |
