The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a new method to study the time-frequency diagrams used to diagnose induction motors. The complex pattern of evolving harmonics and interferences obtained from the analysis of the stator current during a high-inertia direct-on-line startup, such as the one needed for an acceleration test, is analyzed by a non-Markovian Particle Filtering state estimation approach. The introduction...
Under certain circumstances the widespread Motor Current Signature Analysis focused on low frequency components used to detect rotor bar breakages in induction motors cannot provide an adequate indication of this defect. This work studies the behavior of high order components during the last stage of a fatigue test designed to reproduce a natural bar breakage, in which a compensation of the indicators...
Traditional harmonic distortion analysis assumes balanced and steady-state conditions. Moreover, harmonic components are often associated with certain sequences (positive, negative or zero). However, in reality unbalance causes the existence of all sorts of sequences for every frequency. Additionally, time-varying conditions complicate analysis and require appropriate models. Many of the time-varying...
The Fourier transform analysis is able to estimate the amplitude and frequency of signals under stationary conditions. For transient or aperiodic signals the Fourier analysis is unable to obtain accurate results and a joint time-frequency analysis must be used to provide simultaneous time and frequency information of transient intervals. A power quality index is proposed for evaluation of both the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.