US 12,352,666 B2
Method, an arrangement and a frequency converter for identification of torsional natural frequencies of a drivetrain system
Timo Holopainen, Helsinki (FI); Olli Liukkonen, Helsinki (FI); and Markku Niemelä, Lappeenranta (FI)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Jul. 15, 2022, as Appl. No. 17/812,821.
Claims priority of application No. 21185873 (EP), filed on Jul. 15, 2021.
Prior Publication US 2023/0016864 A1, Jan. 19, 2023
Int. Cl. G01M 99/00 (2011.01); G01H 1/00 (2006.01); G01H 1/10 (2006.01); G01H 13/00 (2006.01); G01H 17/00 (2006.01); H02P 21/20 (2016.01)
CPC G01M 99/005 (2013.01) [G01H 1/003 (2013.01); G01H 1/10 (2013.01); G01H 13/00 (2013.01); G01H 17/00 (2013.01); H02P 21/20 (2016.02)] 10 Claims
OG exemplary drawing
 
1. A method for identification of torsional natural frequencies of a drivetrain system, said drivetrain system comprising a frequency converter, an electric machine controlled by said frequency converter, and a driven/driving machine system connected to said electric machine, in which method:
mechanical excitation is produced in said drivetrain system by said frequency converter controlled electric machine, said excitation comprising torsional excitation as an impulse, random noise, pseudo random noise, or a harmonic excitation sweep, and said excitation effecting an excitation response in said drivetrain system;
said excitation response is measured by said frequency converter from the current flowing between said frequency converter and said electric machine as measured current data; and
torsional natural frequencies of said drivetrain system are identified utilizing said excitation response.