Patent ID: 11515764

Abstract:
The subject of the invention is a method and a device for determination of a torsional deflection of a rotation shaft in the electromechanical drivetrain. The method uses a current and a voltage signals measurement of the driving electrical machine and an angular speed measurement of the shaft of the drivetrain and includes the step of measuring of a voltage UDC of the DC link unit of a converter; the step of calculating a value of a load torque Tload of the driving electrical machine; the step of detecting of an oscillation OSC(Tload) in the load torque Tload and calculation magnitudes of characteristic frequencies of Fast Fourier Transform FFT(UDC) of the voltage UDC of DC link unit; the step of determining of a timestamp indicators tTload for oscillations OSC(Tload) and tFFT of UDC for magnitudes of characteristic frequencies of FFT(UDC) of the voltage UDC of DC link unit; the step of comparing the value of the timestamp indicators tTload and tFFT and determining a torsional deflection of the rotation shaft if tTload<tFFT; the step of presenting the result of the comparison to the user in a diagnostic unit.