San Jose del Torreon, Mexico

Technological Institute of La Laguna
San Jose del Torreon, Mexico
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Morales-Caporal R.,Technological Institute of Apizaco | Bonilla-Huerta E.,Technological Institute of Apizaco | Arjona M.A.,Technological Institute of La Laguna | Hernandez C.,Technological Institute of La Laguna
IEEE Transactions on Industrial Electronics | Year: 2013

This paper introduces a sensorless predictive direct torque control (PDTC) scheme for surface-mounted permanent-magnet synchronous machines, which is able to operate at a wide range of speeds. At very low and zero speeds of operation, the identification of the rotor position is carried out by applying test voltage signals in order to detect the machine saliency produced by the stator magnetic saturation. Then, the acquired signals that contain the information of the rotor position are digitally processed by means of a quadrature phase-locked-loop tracking observer. At middle and high speeds, the angular position of the rotor is estimated by using a closed-loop sliding-mode observer of the stator flux which uses reconstructed stator voltages and measured stator currents. Then, a gradual changeover between both algorithms is used for coupling both estimated values of the rotor position. Following this strategy, no extra hardware, special current transducers, or additional connections are required in comparison with a standard drive with an encoder. Experimental results in a wide speed range verify high performance of the proposed encoderless PDTC scheme. © 1982-2012 IEEE.

Carrillo L.R.G.,CINVESTAV | Dzul A.,Technological Institute of La Laguna | Lozano R.,CINVESTAV
IEEE Transactions on Aerospace and Electronic Systems | Year: 2012

This article presents a comparison of three control techniques: nested saturations, backstepping, and sliding modes. The control objective consists of obtaining the best control strategy to stabilize the position of a quad-rotor unmanned aerial vehicle (UAV) when using visual feedback. We propose a vision-based method to measure translational speed as well as the UAV 3D position in a local frame. The three selected controllers were implemented and tested in real-time experiments. The obtained results demonstrate the performance of such methodologies applied to the quad-rotor system. © 1965-2011 IEEE.

Moreno-Valenzuela J.,National Polytechnic Institute of Mexico | Santibanez V.,Technological Institute of La Laguna
Asian Journal of Control | Year: 2013

It is well known that many industrial manipulators use an embedded linear proportional-integral (PI) joint velocity controller to guarantee motion control through proper velocity commands. However, although this control scheme has been very successful in practice, not much attention has been paid to designing new PI velocity control structures. The problem of analyzing a saturated PI velocity joint velocity controller is addressed in this paper. By using the theory of singularly perturbed systems, the closed-loop system is studied. The robot dynamics assumed in this paper take into account bounded time-varying disturbances which may include the friction at the joints. An experimental study in a planar two degrees-of-freedom direct-drive robot is also presented, confirming the advantage of the new saturated PI joint velocity controller. © 2012 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.

Arjona M.A.,Technological Institute of La Laguna | Cisneros-Gonzalez M.,Technological Institute of La Laguna | Hernandez C.,Technological Institute of La Laguna
IEEE Transactions on Industrial Electronics | Year: 2011

Parameter estimation of synchronous generators has been a topic of interest of many investigators for several decades. Different ratings of synchronous machines have been used, and they vary from fractional to hundreds of megawatts. Several time-domain tests have been proposed, along with their implementation methodology, over the years. Those tests have had different impacts on the synchronous machine; some of them are applied when the machine is at a standstill, while others are applied when the machine is online. This paper deals with the application of a novel standstill time-domain test, which is based on the application of a sine cardinal perturbation, for estimating the parameters of the electrical d-q-axis equivalent circuits of a synchronous generator. The set of fundamental parameters for a 7-kVA 1800-r/min 60-Hz salient-pole wye-connected synchronous generator is obtained using a genetic algorithm, and the resulting model is validated against a sudden three-phase short-circuit test. © 2011 IEEE.

De La Fuente Salas I.M.,Technological Institute of La Laguna | Sudhakar Y.N.,Manipal University India | Selvakumar M.,Manipal University India
Applied Surface Science | Year: 2014

In this work we have deposited multlilayer films of polypyrrole (PPy) by galvanostatic method with three different dopants namely p-toluenesulphonic acid, benzene sulphonic acid, and sulfuric acid ions on graphene oxide (GO) layer. The better deposition of PPy films on GO is addressed by studying the influence of different electrolytes, concentrations and current densities. The multilayer films of GO/PPy exhibits greater capacitance compared to GO/PPy single layer. The morphology of the graphene oxide (GO)/multilayer nano PPy structures is carefully analyzed by scanning electron microscopy, FTIR and XPS spectrum. Specific capacitance of fabricated supercapacitor using multilayer electrodes is as high as 332 F g-1 at 10 mV s-1 and also compared with another supercapacitor made from single GO/PPy layer whose capacitance is 215 F g-1. Galvanostatic charge-discharge studies show good performance and stability. © 2014 Elsevier B.V. All rights reserved.

Uribe D.,Technological Institute of La Laguna
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

We address in this paper the adaptation problem in sentiment classification. As we know, available labeled data required by sentiment classifiers does not always exist. Given a set of labeled data from different domains and a collection of unlabeled data of the target domain, it would be interesting to determine which subset of those domains has a feature distribution similar to the target domain. In this way, in the absence of labeled data for a particular target domain, it would be plausible to make use of the labeled data corresponding to the most similar domains. © 2013 Springer-Verlag.

Uribe D.,Technological Institute of La Laguna
Proceedings - 9th International Conference on Machine Learning and Applications, ICMLA 2010 | Year: 2010

In this paper we analyse one of the most challenging problems in natural language processing: domain adaptation in sentiment classification. In particular, we look for generic features by making use of linguistic patterns as an alternative to the commonly feature vectors based on n-grams. The experimentation conducted shows how sentiment classification is highly sensitive to the domain from which the training data are extracted. However, the results of the experimentation also show how a model constructed around linguistic patterns is a plausible alternative for sentiment classification over some domains. © 2010 IEEE.

Ramirez F.A.,Technological Institute of La Laguna | Arjona M.A.,Technological Institute of La Laguna
IEEE Transactions on Sustainable Energy | Year: 2012

This paper presents the development of a single-phase grid-connected wind energy conversion system (WECS) that uses a modified PLL. The WECS development is based on the use of the low cost 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. The modified single-phase PLL is based on the PQ theory, where a lag structure based on an integrator is proposed instead of a conventional lag structure. The voltage source inverter (VSI) is driven by a Space Vector Pulse Width Modulation (SVPWM). The maximum power transfer is achieved by using a Maximum Power Point Tracking (MPPT) algorithm based on the steepest ascent method. The tasks related to the SVPWM algorithm, the PLL, the MPPT algorithm, and the monitoring of the DC voltage were successfully implemented in the DSC. © 2010-2012 IEEE.

Uribe D.,Technological Institute of La Laguna
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

In recent years there has been an increasing interest in techniques for dealing with the compositionality of meaning. In fact, to derive the meaning of complex expressions (i.e. phrases and sentences) from the meanings of their parts has grabbed the researchers’ attention. In this paper, we examine semantic composition from the perspective of sentiment composition: if the meaning of a sentence is a function of the meanings of its parts, the polarity of a sentence is a function of the polarities of its parts. Basically, we propose a model based on sentential sentiment composition in order to categorise a text review (i.e. an opinion) according to the polarity of the sentences it contains. The experimental results showed that our approach is a plausible alternative to categorise subjective texts. © Springer International Publishing Switzerland 2016.

Meza J.L.,Technological Institute of La Laguna | Santibanez V.,Technological Institute of La Laguna | Soto R.,Monterrey Institute of Technology | Llama M.A.,Technological Institute of La Laguna
IEEE Transactions on Industrial Electronics | Year: 2012

In this paper, we present a semiglobal asymptotic stability analysis via Lyapunov theory for a new proportionalintegral- derivative (PID) controller control scheme, proposed in this work, which is based on a fuzzy system for tuning the PID gains for robot manipulators. PID controller is a well-known set point control strategy for industrial manipulators which ensures semiglobal asymptotic stability for fixed symmetric positive definite (proportional, integral, and derivative) gain matrices. We show that semiglobal asymptotic stability attribute also holds for a class of gain matrices depending on the manipulator states. This feature increases the potential of the PID control scheme to improve the performance of the transient response and handle practical constraints in actual robots such as presence of actuators with limited torque capabilities. We illustrate this potential by means of a fuzzy self-tuning algorithm to select the proportional, integral, and derivative gains according to the actual state of a robotic manipulator. To the best of the authors' knowledge, our proposal of a fuzzy self-tuning PID regulator for robot manipulators is the first one with a semiglobal asymptotic stability proof. Real-time experimental results on a two-degree-of-freedom robot arm show the usefulness of the proposed approach. © 2011 IEEE.

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