Sequences of field-oriented control for the detection of faultyrotor bars in induction machines-the Vienna Monitoring Method
Kral, C.; Wieser, R.S.; Pirker, F.; Schagginger, M.
Industrial Electronics, IEEE Transactions on
Volume 47, Issue 5, Oct 2000 Page(s):1042 - 1050
Digital Object Identifier 10.1109/41.873212
Summary:Rotor cage asymmetries of induction machines cause disturbances of
the air-gap flux pattern. These deviations affect torque and speed as
well as stator terminal voltages and currents. The proposed fault
detection technique senses the actual machine state with the help of
real-time space-phasor models. The Vienna Monitoring Method compares
online a voltage model output with a current model and observes the
deviations in a rotor fixed reference frame. High accuracy and
robustness allow the detection of a faulty rotor bar out of the switched
voltage and current signals of an inverter-fed machine in an early
state. The focus of this paper is the detection of a single rotor bar
increase under transient speed conditions without the necessity of a
clutched load. During an inverter-controlled acceleration, lasting only
200 ms, the Vienna Monitoring Method evaluates currents, voltages, and
rotor position for the calculation of an indication quantity that allows
for reliable detection. As only one acceleration task does not excite
every rotor cage bar sufficiently, a set of acceleration and
deceleration cycles has to be driven
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