US 12,253,432 B2
Method and device for detecting electrical current pulses occurring in a rolling bearing as a result of static charging of rotating machine/system parts
Harald Reiners, Aachen (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/912,731
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Mar. 24, 2020, PCT No. PCT/DE2020/100230
§ 371(c)(1), (2) Date Sep. 19, 2022,
PCT Pub. No. WO2021/190677, PCT Pub. Date Sep. 30, 2021.
Prior Publication US 2023/0142615 A1, May 11, 2023
Int. Cl. G01M 13/04 (2019.01); F03D 17/00 (2016.01)
CPC G01M 13/04 (2013.01) [F03D 17/00 (2016.05)] 9 Claims
OG exemplary drawing
 
1. A method for detecting characteristic electrical current pulses flowing through a rolling bearing or sliding bearing as a result of static charging of rotating machine or system parts, the method comprising:
receiving electromagnetic radio waves emitted in a frequency range above 50 MHz as a result of the characteristic electrical current pulses which are generated by the static charging of the rotating machine or system parts;
processing, by filtering, received signal by signal processing in order to extract current pulse events contained therein, wherein the processing of the received signal is implemented by an envelope formation comprising high-pass filtering of the received signal followed by rectification and subsequent low-pass filtering, the rectification comprising cutting away sub-waves of the received signal before low-pass filtering; and
analyzing a temporal progression of the current pulse events for condition monitoring of the rolling bearing or sliding bearing.