Search results for "Slot"
showing 10 items of 27 documents
Algorithmic Approach for Slot Filling Factors Determination in Electrical Machines
2018
In several industrial sectors, such as electric and hybrid traction, the demand for increasingly efficient and high power density electrical machines has grown considerably over the last few years. The improvement of slot filling factor of the electrical machines is an useful provision to satisfy this request. In particular, this topic has been the subject of interest for the industrial sector in recent years, since the technology of winding processes have evolved and allow an economically sustainable realization of windings with an ordered structure rather than randomly. The winding phase must be supported by an accurate design process in which it is possible to evaluate the maximum slot f…
La presencia del nietzscheanismo en la biopolítica contemporánea
2022
La filosofía de Nietzsche anticipó notablemente el umbral de la modernidad biológica al conceptualizar el alcance fisiológico de la moral, la política y la religión, así como su instrumentalización con fines de control social. El objetivo de este artículo es analizar el estímulo que ha representado la filosofía de Nietzsche para algunos de los principales pensadores de la cuestión biopolítica, en concreto, Michel Foucault, Roberto Esposito y Peter Sloterdijk, y desvelar en qué medida sus núcleos conceptuales convergen y divergen. La aportación concreta reside en señalar algunos de los vínculos que articulan el tema de la disciplina y la cría (Zucht und Züchtung) con la configuración de la b…
I vincoli organizzativi alla formazione dei sistemi turistici locali: i Club di prodotto
2010
Agli inizi dello sviluppo del turismo, fare turismo significava essenzialmente trasferirsi per un periodo di tempo più o meno lungo non superiore ad un anno in un luogo diverso da quello da quello abituale e soddisfare l’esigenza in un luogo gradevole e funzionale e con poche esigenze essenziali (fare il bagno al mare, passeggiare in un luogo diverso dall’abituale, sciare in montagna, ecc.). Oggi nel fare turismo è sempre più importante il “cosa fare” e il “come farlo” e la località tende quindi ad essere valutata e prescelta in ragione della capacità di garantire una soddisfazione turistica non solo attrattiva, che convince il turista a muoversi verso di essa, ma occorre garantire servizi,…
Promotion of service industries by means of entry restriction: the case of operators in the slot machine industry
2009
This article examines the effects of government policy on entry restriction for firms within a specific market of the Spanish gambling industry. Spain is an ideal economic region for studying this topic, as it allows for the analysis of quasi-identical populations exposed to different regulatory regimes. In Spain, gaming legislation is determined at the autonomous community level (state level), where differences across states within a single country are of particular interest. This paper analyses the performance of slot machine operators in three autonomous communities, each with different policies with regard to entry restriction. Fifty-eight firms were analysed using multiple regression, …
A General Mathematical Formulation for Winding Layout Arrangement of Electrical Machines
2018
Winding design methods have been a subject of research for many years of the past century. Many methods have been developed, each one characterized by some advantages and drawbacks. Nowadays, the star of slots is the most widespread design tool for electrical machine windings. In this context, this paper presents a simple and effective procedure to determine the distribution of the slot EMFs over the phases and of the winding configuration in all possible typologies of electrical machines equipped with symmetrical windings. The result of this procedure gives a Winding Distribution Table (WDT), which can be used to define coils and coil groups connections and also to simply implement winding…
A general procedure for the construction of Gorges polygons for multi-phase windings of electrical machines
2018
This paper presents a simple and effective procedure for the determination of the Gorges polygon, suitable for all possible winding configurations in electrical machines. This methodology takes into account the determination of a Winding Distribution Table (WDT), in which all the information about the distribution of the currents along the stator periphery is computed and from which the Görges polygon are easily derived. The proposed method can be applied to both symmetrical and asymmetrical multi-phase windings, including concentrated, fractional, reduced and dead-coil ones. The examples provided in this paper demonstrate the versatility of the proposed method.
Slotted Blades Savonius Wind Turbine Analysis by CFD
2013
In this paper a new bucket configuration for a Savonius wind generator is proposed. Numerical analyses are performed to estimate the performances of the proposed configuration by means of the commercial code COMSOL Multiphysics® with respect to Savonius wind turbine with overlap only. Parametric analyses are performed, for a fixed overlap ratio, by varying the slot position; the results show that for slot positioned near the blade root, the Savonius rotor improves performances at low tip speed ratio, evidencing a better starting torque. This circumstance is confirmed by static analyses performed on the slotted blades in order to investigate the starting characteristic of the proposed Savoni…
Fast procedure for the calculation of maximum slot filling factors in electrical machines
2017
This paper presents an algorithm for the calculation of maximum slot filling factor in electrical machines. The determination of whole wire cross section that occupy the area of a stator slot is very important in order to estimate the copper losses: The greater is the filling factor the lower are copper losses. The main goal of this paper is to define a simple algorithm for the determination of slot filling factors suitable for all type of slot profiles. The algorithm can be considered as an additional useful tool for the fast design of electrical machine windings.
Mathematical Model of a PM Brushless Motor with Different Stator-Rotor Pole Pairs Number
2013
The paper presents a mathematical model of Permanent Magnet AC brushless machines (PMSM) having a number of stator poles-obtained via the distribution of the three-phase winding- different from the rotor one, realized by the displacement of the permanent magnets. For these so- called ‘Fractional-Slot’ motors (where few total slots generate high equivalent number of poles) the available mathematical models appear partial and/or incomplete, despite of numerous designing considerations made in literature. In this paper an analytical approach is developed to point out an instantaneous- values mathematical model with concentrated parameters, that can be suitable for control architecture systems …
A GRASP algorithm for the container stowage slot planning problem
2016
This work presents a generalization of the Slot Planning Problem which raises when the liner shipping industry needs to plan the placement of containers within a vessel (stowage planning). State-of-the-art stowage planning relies on a heuristic decomposition where containers are first distributed in clusters along the vessel. For each of those clusters a specific position for each container must be found. Compared to previous studies, we have introduced two new features: the explicit handling of rolled out containers and the inclusion of separations rules for dangerous cargo. We present a novel integer programming formulation and a Greedy Randomized Adaptive Search Procedure (GRASP) to solv…