US 12,385,964 B2
System for monitoring a supply line of an electrical machine fed from a frequency converter
Stefan Hilsenbeck, Steinenbronn (DE)
Assigned to LAPP ENGINEERING AG, Cham (CH)
Appl. No. 18/272,827
Filed by LAPP ENGINEERING AG, Cham (CH)
PCT Filed Jan. 13, 2022, PCT No. PCT/EP2022/050578
§ 371(c)(1), (2) Date Jul. 18, 2023,
PCT Pub. No. WO2022/157053, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 10 2021 000 284.9 (DE), filed on Jan. 20, 2021.
Prior Publication US 2024/0168076 A1, May 23, 2024
Int. Cl. G01R 31/11 (2006.01); G01R 31/42 (2006.01); G01R 31/58 (2020.01); G06F 18/10 (2023.01); G06F 21/52 (2013.01); G06F 21/56 (2013.01)
CPC G01R 31/11 (2013.01) [G01R 31/42 (2013.01); G01R 31/58 (2020.01); G06F 18/10 (2023.01); G06F 21/52 (2013.01); G06F 21/56 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A device for monitoring an electrical supply line of an electrical machine (M) fed by a frequency converter in order to predict failure, wear and/or ageing of the electrical supply line from a sequence of square pulses fed by the frequency converter for operating the electrical machine (M), wherein
the electrical supply line is arranged and routed to connect an electrical machine (M) in an industrial machine or plant or in a land or air vehicle to the frequency converter, and
the frequency converter is arranged and intended to feed the electrical machine (M) with a single-phase or multi-phase alternating voltage (u, v, w) with variable voltage amplitude and pulse duration through the electrical supply line, wherein a change in the pulse duration and/or the variable voltage amplitude of the single-phase or multi-phase alternating voltage (u, v, w) is used to change a speed or torque of the electric machine (M),
the frequency converter is set up and intended to provide each phase of the single-phase or multi-phase alternating voltage (u, v, w) as a sequence of square-wave pulses with a high edge steepness for feeding the electrical machine (M), and where a detection and evaluation device is set up and programmed to
detect and process voltage signals at an output of the frequency converter on one or between two wires of the electrical supply line in order to obtain from the voltage signals a measure of a probability of occurrence of a failure, wear and/or ageing of the electrical supply line, and
output the measure obtained at an output (D).