2,004 research outputs found
PM motors for very high dynamic applications
No full textThis paper presents some design considerations for permanent magnet (PM)
motors to achieve high dynamic performance. This is obtained by maximizing
the ratio between the motor torque and the rotor inertia. It will be
demonstrated that to obtain an optimal solution, the motor has to be
designed on the border between the thermal and magnetic limit, always
satisfying the required torque.
The surface--mounted PM motor is a promising solution for such a
requirement. However, the paper shows that the interior PM motor with
tangential magnetization could be a competitor, thanks to the higher
air--gap flux density. Analytical investigations and simulation results
are presented in the paper for both motor topologies. Finally,
experimental tests are given to validate the theoretical results
Fractional-slot IPM servomotors: analysis and performance comparisons
No full textAbstract – This paper deals with the analysis of a interior
permanent magnet (IPM) synchronous motor, characterized
by a fractional number of slots per pole per phase. Such a
configuration yields to reduced Joule losses and high torque
density. A low torque ripple is achieved, especially compared
with classical PM motors with an integer number of stator
slots per pole per phase. In addition, the motor exhibits high
performance both during overload as well as flux-weakening
operations
Object-oriented algoritms for automatic finite element analysis of PM motors
No full textAbstract
This paper presents a tool for the automatic finite element
analysis of a set of electrical machines. It is based on the
modem object-oriented programming. Taking advantage of the
structure of classes and the mechanism of inheritance, the
analysis of vary PM electrical machines can be carried out with
'slight effort. In addition, thanks to the polymorphism
mechanism, it is not necessary to adopt a unique finite element
software, but different software's can be conveniently adopted,
according the requirements
External-rotor Surface-mounted Permanent-Magnet Motor for Direct-Drive Elevator Systems
No full textAbstract— Direct drive systems, including lift, hoist, winch
and crane, yield lower cost, reduced spaces and negligible
maintenance. The requirement of the lifting application is a
motor with high torque and low speed, so that the direct drive
motor seems to be a suitable solution. By means of a direct
drive system, there is the possibility to eliminate the elevator
room. The paper includes an analytical approach to the design,
a comparison with the finite element analysis and a test on a
final realization of this kind of motor
Desativar o direito: um caminho a partir da obra de Giorgio Agamben
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Jurídicas, Programa de Pós-Graduação em Direito, Florianópolis, 2014O trabalho parte do problema de tentar pensar uma forma de resistência pelo Direito. A hipótese sustentada encontra amparo na noção de "desativar" o Direito, contida na obra de Giorgio Agamben. Neste sentido, o trabalho busca recompor os paradigmas jurídico-político e governamental dentro da obra do autor em questão, principalmente a partir dos livros "O poder soberano e a vida nua", "Estado de Exceção" e "O Reino e a Glória". Ao fim, a proposta de "desativar" o Direito e o conceito de inoperosidade defrontam-se com a máquina governamental agambeniana. Na conclusão, a filosofia do Direito é apresentada como alternativa para se pensar uma nova relação entre Direito e vida.Abstract: The work begins from the problem of trying to think of a way of resistance by Law. The hypothesis is supported by the notion of "deactivate" the law, contained in the work of Giorgio Agamben. In this sense, this dissertation seeks to reconstruct the legal-political and governmental paradigms within the work of the author in question, mostly from the books "The sovereign power and bare life", "State of Exception" and "The Kingdom and the Glory". At the end, the proposal to "deactivate" the Law and the concept of unindustriousness are confronted with Agamben's government machinery. In conclusion, the philosophy of law is presented as an alternative to think about a new relationship between law and life
Design considerations for fractional-slot winding configurations of synchronous machines
No full textThis paper presents some design considerations for synchronous machines characterized by a fractional number of slots per pole per phase. The main advantage of this configuration is a smooth torque, which is due to the elimination of periodicity between slots and poles. A second advantage is a higher fault-tolerant capability, making the machine able to work even in faulty conditions. However, the fractional-slot configuration presents a high content of MMF harmonics that may cause an unbalanced saturation and thus an unbearable torque ripple. A method to design fractional-slot machines is illustrated in this paper, including double-layer and single-layer windings. The analytical computation is extended to determine the harmonics of MMF distribution. Their effect is highlighted in isotropic as well as anisotropic machines. Finally, some considerations are reported to avoid unsuitable configurations
Design considerations on fractional-slot fault-tolerant synchronous motors
No full textAbstract—This paper presents some design considerations for
synchronous machines characterized by a fractional number of
slots per pole per phase. The main advantage of this configuration
is a smooth torque, which is due to the elimination of period-
icity between slots and poles. A second advantage is a higher
fault-tolerant capability, making the machine able to work even
in faulty conditions. However, the fractional-slot configuration
presents a high content of MMF harmonics that may cause an
unbalanced saturation and thus an unbearable torque ripple. A
method to design fractional-slot machines is illustrated in this
paper, including double-layer and single-layer windings. The an-
alytical computation is extended to determine the harmonics of
MMF distribution. Their effect is highlighted in isotropic as well
as anisotropic machines. Finally, some considerations are reported
to avoid unsuitable configurations
Meal-induced thermogenesis and obesity: is a fat meal a risk factor for fat gain in children?
No full textDiet composition, in particular fat intake, has been suggested to be a risk factor for obesity in humans. Several mechanisms may contribute to explain the impact of fat intake on fat gain. One factor may be the low thermogenesis induced by a mixed meal rich in fat
Riscrivere Dante in un'altra lingua:Nel regno oscuro by Giorgio Pressburger
No full textReading from Nel regno oscuro by Giorgio Pressburger followed by a conversation with the author The Jewish, Budapest-born writer Giorgio Pressburger, one of the most interesting contemporary novelists in Europe, does not write in his native Hungarian but in adoptive Italian, and has often reflected about this linguistic choice. His most recent novel, Nel regno oscuro (2008), is inspired by Dante’s Inferno, and describes a journey to Hell which is both a meditation on XX-century history – and the Shoah in particular – and a psychoanalytical attempt, guided by Sigmund Freud, to come to terms with the loss of the author’s dead father and twin brother
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