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.
Inst. of Electr. Drives & Machines, Tech. Univ. Wien;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct 2000
Volume: 47,
Issue: 5
On page(s): 1042-1050
ISSN: 0278-0046
References Cited: 19
CODEN: ITIED6
INSPEC Accession Number: 6729433
Digital Object Identifier: 10.1109/41.873212
Current Version Published: 2002-08-06
Abstract
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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