TECHNIQUES FOR MONITORING GEAR CONDITION

摘要

A method comprising performing the following steps with respect to a system that comprises an electrical motor and a speed output unit, and the electrical motor is followed by a gear, wherein the following acts are performed by a processor operationally coupled to the system: monitoring a first set of frequencies from the system over a measurement period when the system is in a known good operating condition; storing the first set of monitored frequencies or derivatives thereof as reference data in a long-term storage system, monitoring a second set of frequencies from the system over a measurement period when the system is in an unknown operating condition, comparing the second set of monitored frequencies with the first set of monitored frequencies in a frequency domain and in the frequency domain, detecting changes between corresponding frequencies resulting from the second set of monitored frequencies and the first set of monitored frequencies, wherein the electrical motor is driven by a motor drive, and the electrical motor and the motor drive are in a closed-loop configuration, wherein the motor drive utilizes a closed-loop speed feedback signal for controlling the electrical motor and the motor drive in the closed-loop configuration, and wherein at least some of the monitored frequencies are obtained from the closed-loop speed feedback signal or its derivative, wherein the closed-loop speed feedback signal or its derivative comprises a rotational speed information of the electric motor, wherein the rotational speed information is sampled at equal intervals, and wherein the processor is integrated in a controller of the motor drive.