Controlling torsional shaft oscillation

Details Controlling torsional shaft oscillation Controlling torsional shaft oscillation

H - Electricity

02

P

H02P 6/10 (2006.01) E02F 3/04 (2006.01) H02P 7/06 (2006.01)

Patent

CA 2622040

Torsional oscillation of a shaft in a swing drive system of an excavator is minimized by monitoring torsional strain of the shaft. An electric motor provides torque to the shaft in response to a drive signal provided by a converter. A compensation circuit produces a compensation signal as a function of torsional strain of the shaft. A field excitation circuit or regulator powers a converter as a function of the compensation signal such that a counter torque is provided to the shaft and torsional oscillation of the shaft is reduced.

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