Method of detecting vibration anomalies in an electronic device and associated system

A method of detecting vibration anomalies in an electronic device (D) for controlling an electric motor (M) by indicating when predetermined thresholds corresponding to mechanical vibrations incompatible with the relevant application are exceeded, the method comprising:

• a) providing a vibration sensor (1) operably associable with an electronic control unit (2) equipped with a memory unit (3);
• b) actuating the electronic device (D) and the electric motor (M) in a learning mode, with the motor (M) operating with time-varying currents (IA) and speeds (WA);
• c) measuring vibrations by said sensor (1), for each value of current (iA) and speed (WA), to measure instantaneous vibration values (VA) and to determine a first set of reference vibration values (VA(i,w));
• d) storing said first set of reference values (VA(i,w) in said memory unit (3);
• e) actuating the electronic device (D) in a supervision mode and actuating the electric motor (M) in an operating mode, with the motor (M) operating with time-varying currents (iL) and speeds (wL),
• f) measuring vibrations by said sensor (1), for each value of current (IL) and speed (wL), to measure instantaneous vibration values (vL) and to determine a second set of operating vibration values (VL(i,w);
• g) triggering a pre-alarm and alarm signal by said electronic control unit (2) as a vibration value (vL) of said second set of values (VL(i,w)) exceeds the respective vibration value (VA) of said first set of reference values (VA(i,w);
• and
• g2) stopping the electric motor (M) if a vibration value (VL) of said second set of values (VL(i,w)) exceeds its respective vibration value K2·VA(i,w) and if it has a persistence time (tL(i,w)) that exceeds said maximum persistence time value (tA).