Search results for "RELU"
showing 10 items of 32 documents
A Space-Vector State Dynamic Model of the Synchronous Reluctance Motor Including Self and Cross-Saturation Effects and its Parameters Estimation
2018
This paper proposes a space-vector dynamic model of the Synchronous Reluctance Motor (SynRM) including both self-saturation and cross-saturation effects and selecting as state variables the stator currents. The proposed dynamic model is based on an original function between the stator flux and stator current components, and relies on 8 coefficients (fewer than other models in the scientific literature), presenting an interesting physical interpretation. Starting from this approach, both the static and dynamic inductances expressions of the model have been analytically developed, so that the reciprocity conditions for the cross saturation is satisfied. This paper presents also a technique fo…
Space-vector State Dynamic Model of the Synchronous Reluctance Motor Considering Self, Cross-Saturation and Iron Losses
2021
This paper proposes a space-vector dynamic model of the Synchronous Reluctance Motor (SynRM) including both self-saturation, cross-saturation effects, and iron losses expressed in state form, where the magnetizing current has been selected as a state variable. The proposed dynamic model is based on an original function between the stator flux and the magnetizing current components, improving a previously developed magnetic model. Additionally, the proposed model includes, besides the magnetic saturation, also iron losses. The proposed model requires 11 coefficients, among which 6 describe the self-saturation on both axes and 5 describe the cross-saturation. Starting from the definition of a…
Effects of 3rd-harmonic voltage content on dielectric losses of solid insulating materials
1981
Dielectric losses in solid insulating materials subjected to voltages containing 3rd harmonics are studied. By simple theoretical analysis, some curves are obtained showing the behaviour of the ratio between the dielectric losses in the distorted steady state and in a reference sinusoidal steady state, against 3rd-harmonic content. The reference sinusoidal voltage amplitudes were selected in two different ways; namely, such as to have either peak value or effective value equal to those of distorted waveform.Separate effects of harmonic content and of effective value of the applied voltage are shown through the correspondence of every 3rd-harmonic phase angle. Percentage differences between …
A Nonlinear Control of Synchronous Reluctance Motors (SynRM) Based on Feedback Linearization Considering the Self and Cross-Saturation Effects
2019
This paper proposes a nonlinear controller based on feedback linearization for Synchronous Reluctance Motors (SynRM) drives that takes into consideration the self and cross-saturation effects. Such control technique permits the dynamics of both the speed and flux loops to be maintained constant independently from the load and the saturation of the iron core. The proposed technique has been tested experimentally on a suitably developed test set-up.
Kaanonien kaatama? : Johann Gottfried Waltherin elämä
2006
Na melodiach pieśni kolędowych osnute - charakterystyka preludiów organowych Mieczysława Surzyńskiego op. 42
2020
W twórczości Mieczysława Surzyńskiego wyróżnić można grupę utworów inspirowanych muzyką religijną. Szczególne miejsce zajmuje zbiór Rok w pieśni kościelnej op. 42. Jest to cykl preludiów organowych opartych o polskie pieśni kościelne podzielony na pięć zeszytów. Pierwszy poświęcił kompozytor pieśni adwentowej, drugi – kolędom, trzeci – pieśniom pasyjnym, czwarty – pieśniom wielkanocnym, eucharystycznym i o Trójcy Świętej, piąty – pieśniom maryjnym i okolicznościowym. Niniejszy artykuł zawiera analizę muzyczną 12 kolędowych preludiów organowych Mieczysława Surzyńskiego opartych m.in. na melodiach pieśni Anioł pasterzom mówił, W żłobie leży, Bóg się rodzi, A cóż z tą dzieciną będziem czynili.…
Design of Bilateral Switched Reluctance Linear Generator to Convert Wave Energy: Case Study in Sicily
2014
Online expression and spending on personal cybersecurity
2019
The Internet is used increasingly as a platform both for free expression and e-commerce. Internet users have a variety of attitudes towards the security and privacy risks involved with using the Internet; and distinct concerns and behaviors with regard to expressing themselves online. Users may have controversial viewpoints that they may express online in various ways. Controversial viewpoints or artwork by their nature may not be as well received as positive or polite expressions. In the online environment, users with controversial viewpoints may be reluctant to express the viewpoints due to concern about possible consequences resulting from the expressions. Consequences may be imposed by …
Feedback Linearization Based Nonlinear Control of SynRM Drives Accounting for Self- and Cross-Saturation
2022
This article proposes a nonlinear controller based on feedback linearization (FL) for synchronous reluctance motor (SynRM) drives which takes into consideration the magnetic saturation. The proposed nonlinear FL control based control technique has been developed starting from the theoretical definition of an original dynamic model of the SynRM taking into consideration both the self- and the cross-saturation effects. Such a control technique permits the dynamics of both the speed and axis flux loops to be maintained constant independently from the load and the saturation of the iron core in both constant flux and variable direct axis flux operating conditions. Finally, sensitivity of the pe…
Keskivartalon voiman ja tasapainon vaikutus kaarreluisteluun juniorijääkiekkoilijoilla
2013
Harri Väliranta (2013). Keskivartalon voiman ja tasapainon vaikutus kaarreluisteluun juniorikiekkoilijoilla. Liikuntabiologian laitos, Jyväskylän yliopisto, Biomekaniikan Pro-gradu – tutkielma, s 55. Tämän tutkimuksen tarkoitus oli tutkia keskivartalon hallinnan ja tasapainon vaikutusta 11- vuotiaan juniorijääkiekkoilijan kaarreluisteluun. Tutkimus tehtiin kesällä 2011, jolloin joukkueella oli kesäloma ja harjoittelutauko ja siihen osallistui 18 vuonna 1999 syntynyttä junioria. Tutkimukseen sisältyi alkumittaukset ja loppumittaukset, joiden välissä kaksi satunnaisesti valittua ryhmää, tasapainoryhmä ja voimaryhmä, teki kolmesti viikossa omatoimiset harjoitteet ja kolmas ryhmä toimii kontrol…