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Paoli, A., Marconi, L., Bonivento, C.
"A Fault-tolerant strategy for induction motors"
 
Type Conference
Author(s) Paoli, A., Marconi, L., Bonivento, C.
Title A Fault-tolerant strategy for induction motors
Editor Conference on Decision and Control (CDC 2001)
Keywords Induction motor, fault detection and isolation, fault tolerant control, internal model-based control
Abstract

The induction motor (IM) has focused many research efforts in the last years both in the academic and the industrial community. This interest is motivated on one hand by its features, such as simplicity and versatility, which render this motor very attractive in industrial applications and, on the other, by its intrinsically nonlinear model which represents a meaningful benchmark for many nonlinear design techniques.

As all the magnetic rotating machines, the IM is subject to rotor and stator failures caused by a combination of various stresses such as thermal, electrical, mechanical, magnetic and environmental. Due to these stresses the IM can operate into a failure condition. With reference to these kinds of faults it is well known that their effects show with spurious harmonic currents arising in the stator circuit with frequencies which are directly related to the kind of fault (in general stator or rotor fault).

The goal of this paper is the design of a fault tolerant controller able to counteract the effects of several faults, both of mechanical and electrical nature, which can characterize the IM operation. The idea which is behind the proposed controller is quite new with respect to the standard scenario encountered in the FDI and FTC literature. As a matter of fact, with respect to the classical approach which first deals with a phase of fault detection and isolation and then, on the basis of information provided by FDI unit, provide an explicit reconfiguration of the controller, in this paper this order is somewhat swapped: we design a controller embedding an internal model of the fault able to automatically offset the effect of an incipient fault (achieving in this way fault tolerance) and, so doing, also able to reconstruct the fault whose effect has been offset. We show how this idea can be really implemented in the case of IM using the theoretical machinery of the nonlinear output regulation. More in detail we show how a indirect field oriented (IFO) controller can be "augmented" with a dynamic unit designed in order to compensate the unknown spurious harmonic currents arising in the stator circuit in presence of rotor or stator faults. In this way a controller which implicitly fault tolerant to all the faults belonging to model embedded in the regulator is obtained.

Document e479.Document.ps (843469 bytes)
Year 2001


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