公开(公告)号：US11675012B2

公开(公告)日：2023-06-13

申请号：US17448990

申请日：2021-09-27

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Ronald M Lesperance ,  John S Agapiou

IPC: G01R31/00 ,  G01R31/34 ,  G01R31/12

CPC classification number: G01R31/343 ,  G01R31/1227

Abstract: Methods and systems for detecting partial discharge in a stator for an electric motor are provided. An exemplary method includes applying a high voltage AC sinewave input signal to the stator and energizing at least one winding therein. The method includes sensing a first resulting load signal occurring in the stator with a first device and filtering the first resulting load signal to form a first high frequency signal indicating any partial discharge (PD) voltage occurring in the stator. The method also includes sensing a second resulting load signal occurring in the stator with a second device and filtering the second resulting load signal to form a second high frequency signal indicating any partial discharge voltage occurring in the stator. Further, the method includes processing the first and second high frequency signals to form a processed signal indicating whether partial discharge occurred.