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We consider the problem of regulating pressures across large-scale hydraulic networks. We investigate the use of a class of piece-wise constant control laws which take value in a finite number of values and whose transition from one value to another occurs when the measurements cross certain thresholds. We show that these controllers guarantee set-point pressure regulation with an arbitrarily large...
This paper addresses the subject of fault detection in the electrical parts of induction motors. In particular inter-turn short circuit faults are considered. The detection scheme is based on a motor-model, derived in the paper, which does not include the motor speed. This makes the detection scheme robust to any speed and torque changes on the motor shaft. The efficiency of the proposed detection...
This paper presents a novel approach to modeling of a brush-less direct current motor (BLDCM) driven by an inverter using hybrid systems theory. Hybrid systems combine continuous and discrete (event-based) dynamics, which is exactly the case in an inverter-driven BLDCM. The model presented in this work consists of a general automaton with discrete states, combined with a set of continuous dynamic...
This paper addresses the subject of interturn short circuit estimation in the stator of a delta-connected induction motor. In this paper, an adaptive observer scheme is proposed. The proposed observer is capable of simultaneously estimating the speed of the motor, the amount turns involved in the short circuit, and an expression of the current in the short circuit. Moreover, the states of the motor...
This paper addresses the subject of inter-turn short circuit estimation in the stator of a delta-connected induction motor. In the paper an adaptive observer scheme is proposed. The proposed observer is capable of simultaneously estimating the speed of the motor, the amount turns involved in the short circuit and an expression of the current in the short circuit. Moreover the states of the motor are...
In this paper a model of an induction motor affected by stator faults is presented. Two different types of faults are considered, these are; disconnection of a supply phase, and inter-turn and turn-turn short circuits inside the stator. The output of the derived model is compared to real measurements from a specially designed induction motor. With this motor it is possible to simulate both terminal...
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