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Condition monitoring of electric machines is a procedure of increasing importance, as fault tolerant systems are becoming mandatory in many applications. Early diagnosis of faults is a basic pillar in order to achieve full tolerance by the maintenance of faulty parts in electrical machines. As far as electrical drives are concerned, the share of mechanical faults (imbalances, gears and bearings) is...
A control scheme for robust flux-weakening operation of direct-torque-control induction motor drive is proposed. The basic idea is to adjust the flux reference on the basis of the torque error, thus determining a spontaneous flux weakening. To exploit the maximum torque capability, it is necessary to estimate the maximum torque that the induction machine is able to generate at any speed. Initially,...
Intensive research efforts have been focused on the signature analysis (SA) to detect electrical and mechanical faults of induction machines. Different signals can be used: voltage, current, flux and power. In the case of current signals (CSA), the interpretation of one-phase current spectrum or the three-phase current space vector spectrum provides direct information on the presence of abnormal conditions...
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