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In view of the magnetic chain recognition accuracy problem of the bearingless induction motor (BIM) under direct torque control (DTC), a speed sensorless based on Super-Twisting-model reference adaptive system (MRAS) is proposed. The speed sensoerless makes rotor flux on the foundation of Super-Twisting second-order sliding mode as a reference model. The speed sensorless is constructed by using MRAS...
The stator/rotor winding fault is the major kind of fault in induction motor systems. Incipient winding fault detection and isolation can not only improve the reliability of motors, but also avoid serious failures in the entire traction system of high-speed trains. Such that, the incipient fault detection and isolation of stator/rotor winding fault is urgently demanded. Firstly, the mathematical model...
The pole placement control with motion decoupling and integral action, according to the full modal synthesis, is addressed in this paper, to control a 1 kW, 18000 min−1 double conical Bearingless Permanent Magnet Synchronous Motor prototype. An electro-mechanical model of the prototype is derived analytically together with the design of the control scheme. The design of a pole placement scheme, with...
This paper presents a novel radial flux sensing technique to detect and locate stator inter-turn faults in induction motors in online mode. The proposed simplified, inexpensive technique has yet not been reported in literature. The methodology is based on the use of observer coils placed in stator slots along with the stator winding. A sinusoidal voltage is induced in the observer coil (OC) due to...
This paper proposes an innovative fault-diagnosis system for an Asynchronous machine. Stator and rotor faults are identified and analyzed such as inter turn faults resulting in the shorting of one or more circuits of stator phase winding, broken rotor bars. The model used is the one developed by [13]. The proposed strategy consists in developing an observer based on H∞ Control theory followed by a...
This research proposes algorithm development of a speed observer for single-phase induction motor drives. Although, many estimation schemes that have been commonly used for three-phase induction motors exist, a full-order extended Luenberger stat observer was adapted for used with single-phase induction motors in this paper. Due to asymmetrical stator windings, mathematical modeling used for estimation...
In this paper, a mechanical speed estimator based on the model reference adaptive-system (MRAS) principle is evaluated for a single-phase induction motor operated as two-phase motor. In three-phase drives with complete vector control/MRAS system the effect of the rotor time constant is auto-compensated by the decoupling compensators or slip calculation. However, it is not feasible in pure MRAS scheme...
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