US 12,422,336 B2
Method, an arrangement and a frequency converter for controlling vibration of an electric machine
Timo Holopainen, Helsinki (FI); Olli Liukkonen, Helsinki (FI); Janne Roivainen, Helsinki (FI); Tommi Ryyppö, Helsinki (FI); and Aron Szucs, Helsinki (FI)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Jul. 15, 2022, as Appl. No. 17/812,828.
Claims priority of application No. 21185874 (EP), filed on Jul. 15, 2021.
Prior Publication US 2023/0017735 A1, Jan. 19, 2023
Int. Cl. G01M 13/045 (2019.01); G01H 17/00 (2006.01); H02P 23/30 (2016.01); H02P 25/024 (2016.01)
CPC G01M 13/045 (2013.01) [G01H 17/00 (2013.01); H02P 23/30 (2016.02); H02P 25/024 (2016.02)] 13 Claims
OG exemplary drawing
 
1. A method for controlling lateral vibration of a variable-frequency-driven electric machine that is an electric motor connected to a driven machine system via a coupling arrangement, said method comprising:
lateral vibration from said variable-frequency-driven electric machine is measured by one or more vibration sensors as measured vibration data, wherein said one or more vibration sensors are attached on the variable-frequency-driven electric machine;
control torque is determined utilizing said measured vibration data as a time-dependent function of measured vibrations, said control torque being a reactive control torque that acts in an opposite direction to an action torque that rotates a rotor of said variable-frequency-driven electric machine; and
control torque is generated by a frequency converter and exerted on a stator of said variable-frequency-driven electric machine, wherein said exerted control torque produces a variation of horizontal displacement for suppression of horizontal vibration of said variable-frequency-driven electric machine to compensate the horizontal vibrational displacement of said variable-frequency-driven electric machine, wherein said exerted control torque is used for suppression of horizontal vibration of said variable-frequency-driven electric machine at least to control two low frequency horizontal vibration modes, where a stator-frame and the rotor of said variable-frequency-driven electric machine move horizontally with both ends in a same phase.