Abnormal brush wear diagnostic device and rotary electric machine using the same

摘要

The present invention is intended to provide an abnormal wear diagnostic device (12) to detect an abnormal wear that is occurring in an early stage of an operation life of the rotary electric machine to improve an operation life of an electric sliding contact mechanism. The rotary electric machine of the present invention detects pulse signals of small discharges occurring at a sliding interface between a brush (2) and a slip ring (1) and comprises an abnormal wear diagnostic device (12) to make a histogram between the pulse height and the frequency count of the pulse height, compare this histogram with a threshold function of the pulse height and the frequency count issues an warning for the abnormal wear if the histogram is out of the threshold function.