59 research outputs found
Control optimo de par para maquinas SynRM aplicadas a vehiculo electrico
Las maquinas de reluctancia sincrona asistidas por imanes estan atrayendo un considerable interes como alternativa a las maquinas sıncronas de imanes permanentes para su uso en sistemas de propulsion de vehıculos electricos. El control optimo de estas maquinas (incluyendo operacion en debilitamiento de campo) puede resultar complejo, ya que estas son, por lo general, muy sensibles al fenomeno de la saturacion magnetica. En este articulo se trata su control, desde los reguladores hasta el precalculo de referencias de corriente optimas para todo el rango de operacion de la maquina. Finalmente, se muestran resultados experimentales obtenidos en una maquina de 51 kW.El trabajo descrito en este articulo ha sido generado y patrocinado
por el Departamento de Educacion, Politica Linguistica
y Cultura del Gobierno Vasco en base a las ayudas para
apoyar las actividades de grupos de investigacion del sistema
universitario vasco IT978-16 y ha sido financiado por el
Ministerio de Economia y Competitividad a traves del proyecto
de investigacion DPI2014-53685-C2-2-R y los fondos
FEDER, por el Gobierno Vasco a traves del proyecto de
investigacion KT4TRANS del programa ELKARTEK (KK-
2015/00047 y KK-2016/00061) y por los proyectos DPI2013-
41224-P (Ministerio de Economia y Competitividad) y 2014
SGR 267 (AGAUR)
A practical approach to HFI based sensorless control of PM-assisted synchronous reluctance machines applied to EVs and HEVs
Sensorless control is a promising alternative for controlling Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) propulsion systems without the need of complex devices, such as resolvers or encoders. As the usage of a physical sensor is avoided, this allows significant cost reductions of the drive, and the reliability of the system is also improved. EVs require an operation range from standstill to high speeds. At low speeds, the back-EMF of the electric machine is low, and signal injection techniques are required in order to estimate the position and speed of the machine. This paper presents practical implementation details of the High Frequency Injection (HFI) technique, giving special attention to signal processing, offset compensation due to filtering delays and robust speed estimation. The approach is validated in an automotive Permanent Magnet Assisted Synchronous Reluctance Machine (PM-assisted SynRM) of 51 kW.This work has been supported by the Government of
the Basque Country within the research program ELKARTEK
as the project KT4TRANS (KK-2015/00047 and KK-
2016/00061), by the Ministerio de Econom´ıa y Competitividad
of Spain within the project DPI2014-53685-C2-2-R and
FEDER funds, by the Department of Education, Linguistic
Policy and Culture of the Basque Government within the
fund for research groups of the Basque university system
IT978-16 and partially by the “Ministerio de Econom´ıa y
Competitividad” from Spain under the ENE2012-36871-C02-
01 and DPI2013-41224-P Research Projects
REAL-TIME SIMULATION PLATFORM OF AN EMA LANDING GEAR BASED ON MULTIPHASE BLDC
Current environmental concerns have led to the partial electrification of the air transport, following the well-known more electric aircraft (MEA) concept. In such aircraft, electromechanical actuators (EMA) are being progressively introduced to substitute hydraulic actuators. In EMA systems, multiphase technologies are gaining popularity due to their high power density and fault tolerance; however, complexity is increased. To accelerate the early development stages of such systems, real-time simulation can be considered. This work presents a real-time simulation platform for a landing gear EMA implemented in an RT-Lab digital simulator, where the multiphase power system is simulated in an FPGA
Geo-Fence Based Route Tracking Diagnosis Strategy for Energy Prediction Strategies Applied to EV
Nowadays, the shortage of energy and environmental pollution are considered as relevant problems due to the high amount of traditional automotive vehicles with internal combustion engines (ICEs). Electric vehicle (EV) is one of the solutions to localize the energy source and the best choice for saving energy and provide zero emission vehicles. However, their main drawback when compared to conventional vehicles is their limited energy storage capacity, resulting in poor driving ranges. In order to mitigate this issue, the scientific community is extensively researching on energy optimization and prediction strategies to extend the autonomy of EV. In general, such strategies require the knowledge of the route profile, being of capital importance to identify whether the vehicle is on route or not. Considering this, in this paper, a route tracking diagnosis strategy is proposed and tested. The proposed strategy relies on the information provided by the Google Maps API (Application Programming Interface) to calculate the vehicles reference route. Additionally, a Global Positioning System (GPS) device is used to monitor the real vehicle position. The proposed strategy is validated throughout simulation, Driver in the Loop (DiL) test and experimental tests.This work was supported in part by the H2020 European Commission under Grant 769944 (STEVE Project), Grant 824311 (ACHILES Project) and Grant 769902 (DOMUS Project) and in part by the research projects GANICS (KK-2017/00050), SICSOL (KK-2018/00064) and ENSOL (KK-2018/00040), within the ELKARTEK program of the Government of the Basque Country. Finally, this work has been supported by the Department of Education, Linguistic Policy and Culture of the Basque Government within the fund for research groups of the Basque university system IT978-16
Gemini Spectroscopic Survey of Young Star Clusters in Merging/Interacting Galaxies. II. NGC 3256 Clusters
We present Gemini optical spectroscopy of 23 young star clusters in NGC3256.
We find that the cluster ages range are from few Myr to ~150 Myr. All these
clusters are relatively massive (2--40)x 10^{5} \msun$ and appear to be of
roughly 1.5 \zo metallicity. The majority of the clusters in our sample follow
the same rotation curve as the gas and hence were presumably formed in the
molecular-gas disk. However, a western subsample of five clusters has
velocities that deviate significantly from the gas rotation curve. These
clusters may either belong to the second spiral galaxy of the merger or may
have formed in tidal-tail gas falling back into the system. We discuss our
observations in light of other known cluster populations in merging galaxies,
and suggest that NGC 3256 is similar to Arp 220, and hence may become an
Ultra-luminous Infrared Galaxy as the merger progresses and the star-formation
rate increases.
Some of the clusters which appeared as isolated in our ground-based images
are clearly resolved into multiple sub-components in the HST-ACS images. The
same effect has been observed in the Antennae galaxies, showing that clusters
are often not formed in isolation, but instead tend to form in larger groups or
cluster complexes.Comment: 20 pages, 10 figures, 3 tables; Accepted Ap
Route tracking diagnosis algorithm for EV energy prediction strategies
Current pollution issues generated by internal com bustion engine (ICE) based vehicles have lead to their progressive introduction of electrified transport systems. However, their main drawback is their poor autonomy when compared to conventional vehicles. In order to mitigate this issue, the scientific community is extensively researching on energy optimization and prediction strategies to extend the autonomy of electric vehicles (EV). In general, such strategies require the knowledge of the route profile, being of capital importance to identify whether the vehicle is on route or not. Considering this, in this paper, a geo-fence based route tracking diagnosis strategy is proposed and tested. The proposed strategy relies on the information provided by the Google Maps API (Application Programming Interface) to calculate the vehicles reference route. Additionally, a Global Positioning System (GPS) device is used to monitor the real vehicle position. The proposed strategy is validated throughout simulation and experimental tests.This work was supported in part by the H2020 European Commission under Grant 769944 (STEVE Project), Grant 824311 (ACHILES Project) and Grant 769902 (DOMUS Project) and in part by the research projects GANICS (KK 2017/00050), SICSOL (KK-2018/00064) and ENSOL (KK- 2018/00040), within the ELKARTEK program of the Gov ernment of the Basque Country. Finally, this work has been supported by the Department of Education, Linguistic Policy and Culture of the Basque Government within the fund for research groups of the Basque university system IT978-16
Star Clusters in the Tidal Tails of Interacting Galaxies: Cluster Populations Across a Variety of Tail Environments
We have searched for compact stellar structures within 17 tidal tails in 13
different interacting galaxies using F606W- and F814W- band images from the
Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST). The
sample of tidal tails includes a diverse population of optical properties,
merging galaxy mass ratios, HI content, and ages. Combining our tail sample
with Knierman et al. (2003), we find evidence of star clusters formed in situ
with Mv < -8.5 and V-I < 2.0 in 10 of 23 tidal tails; we are able to identify
cluster candidates to Mv = -6.5 in the closest tails. Three tails offer clear
examples of "beads on a string" star formation morphology in V-I color maps.
Two tails present both tidal dwarf galaxy (TDG) candidates and cluster
candidates. Statistical diagnostics indicate that clusters in tidal tails may
be drawn from the same power-law luminosity functions (with logarithmic slopes
~ -2 - -2.5) found in quiescent spiral galaxies and the interiors of
interacting systems. We find that the tail regions with the largest number of
observable clusters are relatively young (< 250 Myr old) and bright (V < 24 mag
arcsec^(-2)), probably attributed to the strong bursts of star formation in
interacting systems soon after periapse. Otherwise, we find no statistical
difference between cluster-rich and cluster-poor tails in terms of many
observable characteristics, though this analysis suffers from complex,
unresolved gas dynamics and projection effects.Comment: Accepted for publication in the Astrophysical Journal. 27 pages, 8
figure
Shocks and Star Formation in Stephan's Quintet. I. Gemini Spectroscopy of H{\alpha}-bright knots
We present a Gemini-GMOS spectroscopic study of HST-selected
H{\alpha}-emitting regions in Stephan's Quintet (HCG 92), a nearby compact
galaxy group, with the aim of disentangling the processes of shock-induced
heating and star formation in its intra-group medium. The 40 sources
are distributed across the system, but most densely concentrated in the
kpc-long shock region. Their spectra neatly divide them into narrow- and
and broad-line emitters, and we decompose the latter into three or more
emission peaks corresponding to spatial elements discernible in HST imaging.
The emission line ratios of the two populations of H{\alpha}-emitters confirm
their nature as H II regions (90% of the sample) or molecular gas heated by a
shock-front propagating at 300 km/s. Their redshift distribution
reveals interesting three-dimensional structure with respect to gas-phase
baryons, with no H II regions associated with shocked gas, no shocked regions
in the intruder galaxy NGC 7318B, and a sharp boundary between shocks and star
formation. We conclude that star formation is inhibited substantially, if not
entirely, in the shock region. Attributing those H II regions projected against
the shock to the intruder, we find a lopsided distribution of star formation in
this galaxy, reminiscent of pile-up regions in models of interacting galaxies.
The H{\alpha} luminosities imply mass outputs, star formation rates, and
efficiencies similar to nearby star-forming regions. Two large knots are an
exception to this, being comparable in stellar output to the prolific 30
Doradus region. We also examine Stephan's Quintet in the context of compact
galaxy group evolution, as a paradigm for intermittent star formation histories
in the presence of a rich, X-ray emitting intra-group medium.Comment: Accepted for publication in the Astrophysical Journal. Decreased
resolution for arXiv version, please contact the lead author for a
full-resolution articl
Evidence for Environmentally Dependent Cluster Disruption in M83
Using multi-wavelength imaging from the Wide Field Camera 3 on the Hubble
Space Telescope we study the stellar cluster populations of two adjacent fields
in the nearby face-on spiral galaxy, M83. The observations cover the galactic
centre and reach out to ~6 kpc, thereby spanning a large range of environmental
conditions, ideal for testing empirical laws of cluster disruption. The
clusters are selected by visual inspection to be centrally concentrated,
symmetric, and resolved on the images. We find that a large fraction of objects
detected by automated algorithms (e.g. SExtractor or Daofind) are not clusters,
but rather are associations. These are likely to disperse into the field on
timescales of tens of Myr due to their lower stellar densities and not due to
gas expulsion (i.e. they were never gravitationally bound). We split the sample
into two discrete fields (inner and outer regions of the galaxy) and search for
evidence of environmentally dependent cluster disruption. Colour-colour
diagrams of the clusters, when compared to simple stellar population models,
already indicate that a much larger fraction of the clusters in the outer field
are older by tens of Myr than in the inner field. This impression is quantified
by estimating each cluster's properties (age, mass, and extinction) and
comparing the age/mass distributions between the two fields. Our results are
inconsistent with "universal" age and mass distributions of clusters, and
instead show that the ambient environment strongly affects the observed
populations.Comment: 6 pages, 3 figures, MNRAS in pres
- …