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This paper investigates the impact of inertia on the fault signatures of squirrel cage induction machines. Rotor faults give rise to harmonic side band currents and double slip frequency shaft torque oscillations, however. The total drive inertia thus influences the speed ripple which, again, influences the balance of the magnitudes of the lower and upper side band current. Considering certain assumptions,...
This contribution investigates the Vienna monitoring method during transient operation. The Vienna monitoring method is a rotor fault detection technique based on two space phasor machine models. These models derive quantities such as flux and torque. An induction machine with rotor asymmetries gives rise to double slip frequency oscillations of shaft torque. These oscillations are also reflected...
Mechanical rotor imbalances and rotor eccentricities give rise to specific mechanical vibration, and certain electric, electromagnetic and mechanical harmonics. The extent and location of these harmonics depends on the actual severity of the imbalance, machine supply and load torque. Many fault detection techniques evaluate the spectral components of any of the mentioned electric or mechanical quantities...
Electrical rotor asymmetries such as broken rotor bars give rise to well known side band currents in the vicinity of the fundamental as well as double slip frequency torque modulation. An externally caused low frequency load torque modulation may therefore also cause similar effects such as side band currents and modulation of the electromechanical torque. It is therefore a challenge to clearly distinguish...
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