21 research outputs found
Segmented Hairpin Topology for Reduced Losses at High Frequency Operations
No full textNowadays, one of the key challenges in transport electrification is the reduction of components’ size and weight. The electrical machine plays a relevant role in this regard. Designing machines with higher rotational speeds and excitation frequencies is one of the most effective solutions to increase power densities, but this comes at the cost of increased losses in cores and windings. This challenge is even more pronounced in preformed windings, such as hairpins, which enable higher slot fill factors and shorten manufacturing cycle times. In this work an improved hairpin winding concept is proposed, aiming to minimize high-frequency losses while maintaining the benefits deriving from the implementation of hairpin windings onto electrical machines. Analytical and finite element models are first used to assess the high-frequency losses in the proposed winding concept, namely the segmented hairpin, proving the benefits compared to conventional layouts. Experimental tests are also performed on a number of motorettes comprising both conventional and proposed segmented hairpin configurations. Finally, these experimental results are compared against those collected from motorettes equipped with random windings, demonstrating the competitiveness of the segmented hairpin layout even at high-frequency operations.
© 20XX IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper reflects only the author's view. JU is not responsible for any use that may be made of the information it contains
La scelta del trauma. Eraldo Affinati negli anni '90
No full textThe article reads the short stories and novels by the Italian writer Eraldo Affinati in the 1990s, with special regard to a twofold aspect: the cultural appropriation of a post-war traumatic experience by an author born in 1956, which lead to the strive to re-invent one's own past in an eventless present. Affinati's ethical approach to fiction is deeply questioned in the last part of the essa
Eraldo Antonini Lectures, 1983–2019
No full textAbstract “Can order spring from Chaos?” is the title of an extensive Report on Italian science published by NATURE on 12 May 1983 and written by Robert Walgate, the Chief European Correspondent. It is a twenty pages complete paper touching all aspects of the struggle of Italian scientists to work in the “curious amalgam of ingenuity and muddle, a reflection of the political system”. (Nature, 1983; 303: 109–128). To read it after four decades is interesting but somewhat depressing since the main problems unfolded in the paper have not been solved, starting with the largely insufficient support of fundamental curiosity driven research. At page 114 you could find a item called: ITALY’s TOP SCIENTISTS: Four in the top one thousand. The Author refers to the data reported by the ISI (Institute of Scientific Information) that took two years to scan 3,000 major journals over the period 1965–78 and covered 5 millions articles and 67 millions references. The four top Italian scientists working in Italy were: Eraldo Antonini (3127 citations), Enrico Clementi (4001), Silvio Garattini (2833), and Giorgio Giacomelli (2483); 3 out of four were 52 years old, and one 55. Antonini did not see the Report since he passed away on March 18, 1983. However the information leaked before the publication of Nature because I remember the Messaggero of Rome reporting a whole page with the ranking of the four Italians, and even a picture of Eraldo. The students of the first year Medical course, his Class, welcomed the Professor with a standing ovation. After a short time the Board of the SIB (Società Italiana di Biochimica) casted a unanimous vote in favour of the motion of President Noris Siliprandi to begin the annual Congress with an Antonini Lecture, forever. As reported below, the tradition began immediately at the Congress in Saint-Vicent, Italy, and is continuing. In this paper I report an account of the Eraldo Antonini Lectures that I attended over the years and until September 2019, a few months before the pandemics lock down
Sviluppo di modelli FEM 3D per analisi dei fenomeni elettromagnetici peculiari nelle macchine sincrone
No full textL'argomento trattato è la modellazione di un turboalternatore da 470 MVA, si realizzerà un modello 3D che verrà usato poi per il calcolo numerico dei fenomeni elettromagnetici quali correnti parassite, flusso disperso alle testate e forze elettromagneticche dovute alla componente assiale del campo, la difficoltà nella modellazione consiste nel gestire la complessità reale delka macchina e adottare semplificazioni in modo da rendere un modello che non richiede molta onerosita di calcolo e che rappresenti in maniera affidabile I fenomeni
Eraldo Candido Gvido Marchi – Erald Marki
No full textU članku se nastoji osvijetliti hvarsko podrijetlo inž. Eralda Markija (Marchi) kroz dostupne matične knjige (rođenih, umrlih, vjenčanih i stanje duša). Također, koliko je god bilo moguće, kroz dostupne novinske članke i rijetku stručnu literaturu prati se njegov životni put i rad u Splitu te njegova povezanost s meteorologijom, izgradnjom Meteorološkog opservatorija Marjan te njegovi stručni i popularni radovi.Erald Marki was born in Hvar on August 14, 1876, with the full name Eraldo Candido Gvido Marchi, to his mother Margarita (née Novak) and father Andrea Marchi. The Marchi family was ever-present in Hvar throughout the 19th and the first half of the 20th century, primarily because its members were well-known entrepreneurs and designers-contractors (builders) of numerous houses in Hvar. It has not yet been determined when or which generation of the Marchi family settled in Split. It is also unclear exactly when he began using the phonetically adapted name and surname—Erald Marki—but it was certainly before the autumn of 1924, as he published his treatise Climatic Conditions of Dalmatia under the signature Prof. Eng. E. Marki. However, this was after 1920, when he was still referred to as Marchi during the founding of the Split Olympic Subcommittee. He completed elementary school and the Great Realka grammar school in Split, and later, in 1901, graduated from the Technical University in Graz. From 1912, he was a regular member of the Austrian Meteorological Society, and in Split, he was involved in numerous civic associations, such as the Mosor Hiking Society (HPD Mosor), the Labud Sailing Club (Y.c. Labud), and the Split Olympic Subcommittee. He was the director of the Split Auto Club (Auto Club Spalato), secretary of the Society of Engineers and Architects in the Kingdom of Dalmatia, and more. He was the conceptual originator of the idea and construction of the Marjan Meteorological Observatory in Split, where he served as its first director for five years, from its opening in 1926 until 1930. He was the author of numerous popular lectures, articles, short pieces, and scientific papers. Among meteorologists, his works remain relevant today, particularly Climatic Conditions of Dalmatia (1924), Meteorological Service on the Adriatic (1927), and Weather – A Practical Guide to Understanding and Predicting Weather Without Instruments (1955). He lived and worked in Split, but today’s Split has forgotten him, while in his native Hvar, he remains completely unknown. Did he deserve this
Dal Moro a san Carlo: la poesia narrativa
No full textThe present contribution covers a time span of around 70 years of history of Italian literature in the Duchy of Milan with a specific focus on long and short narrative poetry, and, more broadly, on dramatic poetry (dramatic eclogues, comedies in verse, pastoral poetry). The starting point of this study is Ludovico Sforza's court in the 1490s, when - even though literature in Tuscan vernacular did not flourish to the same extent as visual arts and classical studies did in those times - a few works of dramatic and mimetic poetry written in terza rima and ottava rima appeared in print. Among them was "De Paulo e Daria amanti" by Gasparo Visconti (1495), a piece of encomiastic poetry dealing with adventure and love. This work shows connections with the tradition of the cantari - it is worth mentioning that between the 15th and the 16th century Milanese publishers thrived on chivalric romance as well as historical and political cantari centered on the contemporary Italian wars. These wars also marked a turning point in the literatureof the Duchy, and until the 1530s they led to discontinuation of more high-brow genres, that later came back under Alfonso d'Avalos' patronage-driven government. Such is the historical context in which the poetry of Giovanni Alberto Albicante saw the light. Although he has never been wiewed either as a canonical or a first-rate poet, Albicante was representative of a category of professional writers who played a significant role in the literary scene of that time, besides being well-known for his quarrel with Pietro Aretino and for his mythological ("Nottomia d'Amore", 1536), historical ("Historia de la guerra del Piamonte", 1538) and celebratory poems. Towards the middle of the century the history of Milanese (as well as Italian) literature became ruled by the academies like that of the Trasformati (1548) and the Fenici (1552-56) in the chief town or, within the boundaries of the Duchy, the Pastori dell'Agogna in Novara. Among them there was Giovanni Agostino Caccia, author of pastoral plays that, along with those by Luca Contile, deserve attention in the study of the development of pastoral poetry in Italy beyond the perspective of its Ferrarese origins. This contribution ends on the work of Girolamo Bossi, who between 1557 and 1560 published a poem, "La genealogia della gloriosissima casa d'Austria", the title of which is revealing of the celebratory purpose it was meant to serve. At the same time, though, this poem may be studied in connnection with "Orlando furioso" in terms of poetic experiments conducted in the mid-16th century through the cross-breeding of chivalric romance and epic poetry as well as of the combination of Aristotelian rules with narrative freedom
Hairpin Windings: Sensitivity Analysis and Guidelines to Reduce AC Losses
No full textAbstract— Nowadays, electrification in the transportation sector is one of the most viable solutions to reduce CO2 emissions
and meet fuel economy requirements. Being the electrical machine one of the most important players in this electrification
trend, extensive research is currently being dedicated to the improvement of their efficiency and power density. In
automotive applications, hairpin technologies are widely spreading due to their potential in reducing costs and life cycles
in a mass production perspective, as well as in increasing the torque capabilities of machines. However, several challenges
need to be addressed before the complete replacement of random windings with hairpins can take place. Of these
challenges, the loss produced during high frequency operations is one of the most limiting. This paper aims at studying and
investigating high frequency (AC) losses for different slot geometries and conductor cross sections, which in turn involve the analysis of different slots-per-pole-per-phase / layers-perslot combinations. In addition, the effects on the AC losses of
reducing the slot fill factor are studied, either by removing the closest conductors to the slot opening or by reducing the hairpin legs’ height. Analytical and numerical models are employed to investigate these concepts.
© 20XX IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper reflects only the author's view. JU is not responsible for any use that may be made of the information it contains
A Study of characterization and representation in James Joyce's a portrait of the artist as a young man and John barth's lost, in the funhouse
No full textDissetação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e ExpressãoAnálise da caracterização e da representação do artista nos romances A Portrait of the Artist as a Young Man de James Joyce e Lost in the Funhouse de John Barth. A análise destes romances quanto às diferenças existentes no modo de representação do artista, faz com que eles possam ser lidos, respectivamente, como representantes das narrativas modernista e pós-modernista
Influence of Rotor Design on Electromagnetic Performance in Interior Permanent Magnet Machines
No full textJohn Barclay's Argenis and its influence on the seventeenth century italian novel
No full textIl romanzo latino Argenis di John Barclay, pubblicato a Parigi nel 1621, è stato uno dei libri più amati della sua epoca. La ragione del plauso dei lettori sarà da ricercare nella complessa macchina narrativa ideata dall'autore, unione di narrazione, storia, evocata in forma di allegoria, e magistero politico; in questo nuovo modello di scrittura è stato riconosciuto l'atto fondativo del genere cosidetto del "roman à clef" ("romanzo a chiave" in italiano). La ricerca propone un rigoroso studio dell'opera e mira alla definizione del giudizio su di essa espresso dai letterati italiani nel corso del Seicento. La tesi si sofferma in seguito sull'influenza esercitata dall'Argenis sul romanzo italiano. Attenzioni preliminari vengono così dedicate alle alterne fortune godute, nelle scritture di ambientazione fantastica, da alcune caratterizzanti scelte narrative del modello latino. Vengono quindi studiati i "romanzi a chiave" per delineare le declinazioni peculiari del genere in Italia, ponendo particolare attenzione alle forme e finalità di impiego della storia e ai nuovi indirizzi della materia politica. Gli autori di "romanzi a chiave" studiati sono: Francesco Agricoletti, Ciro Anselmi, Francesco Belli, Guidubaldo Benamati, Giovanni Francesco Biondi, Girolamo Brusoni, Niccolò Maria Corbelli, Carlo de' Dottori, Giovanni Francesco Loredano e Ferrante PallavicinoJohn Barclay's Argenis, a latin novel published in Paris in 1621, is one of the best sellers of its time. The reason for success is to be found in the complex narrative system conceived by the author, union of narration, history, recalled in the form of an allegory, and political thought; the foundative act of the so-called genre of the "roman à clef" ("novel with a key") is recognized in this new model of writing. The research aims at studying Barclay's novel and try to define its value in the opinion of the italian men of letters. The thesis focuses also on the influence of the Argenis on the seventeenth century italian novel. Preliminary attentions are dedicated to the variable success met by some characterizing narrative choices of the latin model within the fantasy setting novels. The italian "romans à clef" are examinated to determine the features of the genre in Italy, studying the forms and the finality of the use of history and the rethinkings imposed to the political argument. The authors examinated are: Francesco Agricoletti, Ciro Anselmi, Francesco Belli, Guidubaldo Benamati, Giovanni Francesco Biondi, Girolamo Brusoni, Niccolò Maria Corbelli, Carlo de' Dottori, Giovanni Francesco Loredano e Ferrante Pallavicino
