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This paper introduces a speed-sensorless method for detecting rotor asymmetries in wound rotor induction machine (WRIM) working as generator in wind turbines. The method is based on time-frequency analysis of rotors currents and a new transformation, which make it suitable for every working condition of the machine: steady state, transient regime and non-stationary conditions. Besides, the results...
This paper introduces a new method of fault diagnosis for induction motors, the Multilayer Park's Vector Approach, derived from the well-known fault diagnostic method based on Park's Vector Approach analysis. This new method allows the detection of failures in steady and transient regimes operation on induction motors. The resulting vector generated provides the information about deviations in the...
Diagnosis of faults in induction motors has been accomplished traditionally following a two stage procedure: first, the selected diagnostic quantity is measured and treated with an appropriate signal analysis tool, and, second, the diagnostic signal is evaluated, either by trained personnel or by automatic systems, to determine the presence and the severity of the fault. The techniques used in each...
The diagnosis of electrical motors through the detection of fault frequency signatures in the current's spectrum has become an established standard in the field of industrial maintenance systems. Nevertheles, its implementation on devices with low computing power remains a practical challenge. Industrial controllers, such as programmable logic controllers, or modern, low cost controller hardware,...
Improved fault diagnostic techniques in wind turbines is a field of growing interest, given the negative impact that unexpected breakdowns have on the profitability of wind farms. New diagnostic techniques based on generator currents monitoring have recently been developed, but their use is still irrelevant despite the advantages that current monitoring presents versus monitoring vibrations. In part,...
Induction motors play a key role in the industrial field. Therefore, continuous monitoring and online diagnostic systems are essential to guarantee the seamless operation of modern industrial facilities. But, in moder automation installations, motor operation is controlled by programmable logic controllers (PLCs), which have become the main field controllers in automated process. This paper proposed...
The design of a bio-mechanically driven double stator axial flux MEMS power generator for use in cardiac pacemakers has been presented. In the system, an asymmetrical circular rotor embedded with alternate polarity microfabricated NdFeB permanent magnets oscillates around a central shaft due to the motion of the thorax during breathing to induce a voltage across the stator coils. The generator has...
The general strategy to get a very fast torque control in a DC or AC machine is based on keeping the pulsational electromotive forces (EMFs) of all of its phases as small as possible during the transient states and achieving the torque changes by exclusively enhancing the rotational EMFs. All the resources available have to be oriented in this direction. This very simple but profound physical idea,...
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