PURPOSE: To prevent the occurrence of false detection due to a low-frequency fundamental wave component formed by a load current flowing through a stator winding by a method wherein a pulsation signal delivered from a magnetic flux detecting element detecting a leakage flux from a rotor winding is impressed on a decision unit through the intermediary of a low pass filter.
CONSTITUTION: A leakage flux from the winding of a rotor 2 is detected by a magnetic flux detecting element 5 provided at a stator 1 of a rotary electric machine 12, opposite to the outer-peripheral surface of the rotor 2, and a pulsation signal corresponding to the flux is generated from the element 5. A low- frequency fundamental component which is superimposed on the pulsation signal and formed by a load current flowing through a stator winding 1c is removed by a low pass filter 13 and then impressed on a decision unit via a peak value retainer, and thus the abnormality of the rotor winding is detected accurately without any false detection or the like due to the stator winding current.
ITOU MOTOYA
TAKAHASHI NORIYOSHI
SATOU YUKINORI
| JP55141083B | ||||
| JPS5330101B2 | 1978-08-24 |