US 11,675,012 B2
Detection of partial discharge
Ronald M Lesperance, Troy, MI (US); and John S Agapiou, Rochester Hills, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Sep. 27, 2021, as Appl. No. 17/448,990.
Prior Publication US 2023/0115294 A1, Apr. 13, 2023
Int. Cl. G01R 31/00 (2006.01); G01R 31/34 (2020.01); G01R 31/12 (2020.01)
CPC G01R 31/343 (2013.01) [G01R 31/1227 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for detecting a partial discharge in a stator for an electric motor, the method comprising:
generating an AC sinewave input signal with an AC function generator;
amplifying the AC sinewave input signal to an increased voltage with an amplifier to form a high voltage AC sinewave input signal, wherein the increased voltage is at least 100 volts;
applying the high voltage AC sinewave input signal to the stator and energizing at least one winding therein;
sensing a first resulting load signal occurring in the stator with a first device;
filtering the first resulting load signal to form a first high frequency signal indicating any partial discharge voltage occurring in the stator;
sensing a second resulting load signal occurring in the stator with a second device;
filtering the second resulting load signal to form a second high frequency signal indicating any partial discharge voltage occurring in the stator; and
processing the first high frequency signal and the second high frequency signal to form a processed signal indicating whether partial discharge occurred.