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Early detection of faults in the bearings of electric motors is vital to reduce maintenance costs of industrial motors. Vibration signal analysis is a well-known and widely used diagnostic approach for bearing fault identification, and usually leads to good results in terms of effectiveness and detection capability. However, small defects, at an early stage of development, can be hard to find and...
This work presents a comparative analysis of a successively evaluated state space model-based predictive control approach used to drive a five-phase permanent magnet synchronous motor. It is presented a five-phase motor modelling and control theoretical basis main concept, including the prediction model preparation, as well unconstrained and constrained formulations. Both formulations are used and...
This work proposes a study about using the successively evaluated state space model-based predictive control to drive a permanent magnet synchronous motor. The objective of this paper is to show as the control constraints and the anticipative reference characteristics influence in the drive. Still, it is done a brief analysis about the improvement of the drive efficiency with the proposed control...
In high power electric motors it is common to use open slots to facilitate the assembly of the coils. Open slots introduce harmonics in the magnetomotive force distribution over the air gap, resulting in additional losses and parasitic torques. In order to reduce these effects, wedges of magnetic material are used. These wedges are prone to apartial or total detachment, which in turn may result in...
This paper deals with a control system for voltage regulation in stand-alone generation systems based on self-excited induction generators (SEIG). It is considered a three-wire hybrid topology composed by switchable capacitor banks and distribution static compensator (DSTATCOM). While the switchable capacitor banks supply the most part of the reactive power for voltage regulation, the DSTATCOM is...
This paper presents an analysis of the magnetic saliencies in induction machines based on the injection of a zero sequence carrier. This way of injection allows evaluating those components of the admittance matrix which are not usually considered in the literature. The injection of the zero sequence carrier can easily be implemented, does not perturb the current control and the evaluation of its response...
Split-Type Air Conditioners (ACs) are extensively used in households, commercial organizations and industrial setups. The duty-cycle based hysteretic control is inefficient and requires high power provisioning of full startup current for the compressor at each turn-on. This is especially demanding in constrained power systems with weak grids where people are dependent on backup generators and UPS...
This paper deals with the small-signal stability analysis of a dc-distribution electrical power system (EPS) sourced by permanent-magnet synchronous generator (PMSG), which is one of the main topology candidate for future more-electric aircraft (MEA). A detailed mathematical model is developed and comprehensive EPS modal analysis including eigenvalues sensitivity and participation factor performed...
This paper considers a control approach for synchronous reluctance machines operating at variable speed regimes based on modern robust control tools. The main challenge arises from the inherent nonlinear magnetic behavior of the machine, caused by core saturation and cross saturation phenomena, resulting in a nonlinear dependence of the machine inductances from the instantaneous values of both direct...
This paper proposes the use of an analog switching function in sliding mode control for a brushless DC motor speed, with the objective of input chattering reduction. The sliding mode control topology is used in the mechanical speed loop control as well as in the stator current loop control. The results show a good chattering reduction, a good machine performance and a good robustness of the controller...
Doubly Fed Induction Generator (DFIG) have many industrial applications and are also used as Wind Power generators. The brushes, required to connect the energy supply to the rotor, are the main drawback of these machines. Therefore there are interest in replace this generator by Brushless Doubly Fed Induction Generator (BDFIG). The Cascaded Doubly Fed Induction Generator (CDFIG) can be used as a starting...
This work presents a feasibility study between two topologies which can be used in a variable speed synchronous compensator using a wound rotor induction machine (WRIM) operating in doubly fed mode (DFIG). The synchronous compensator has the capability to maintain a good quality of electricity from the grid, injecting or absorbing reactive power dynamically, in events where there is a harmful increase...
Frequency response analysis (FRA) has been employed as an effective tool for the detection of various mechanical winding and core deformations within electrical power transformer. Traditional FRA signature interpretation relies on the magnitude of the FRA plot although all practical frequency response analyzers are able to provide both magnitude and angle of the FRA signal in wide frequency range...
Sign language is the basic communication method between deaf people. A translator is usually needed when an ordinary person wants to communicate with a deaf one. This paper presents a system for sign language recognition of Mexican sign language to Spanish oral language. In sign language recognition, there are important challenges as to develop methods that solve signer-independent continuous sign...
This paper proposes a source localization method based on blind source separation, which can be applied to locate multiple simultaneous acoustic sources in a reverberant environment. The proposed system uses the signals acquired by a set of microphone arrays, applies a blind source localization algorithm to obtain the direction-of-arrival (DOA) of each source-array pair, and combines the results to...
Minimally invasive neck surgery is a promising technique which is not commonly adopted. Due to the actual intra-operative bedding of the patient which results in a tissue shift compared to the pre-operative imaging, a suitable navigation procedure is required. The detection of the bedding-caused tissue shift is essential for a safe orientation for the surgeons to establish new endoscopic operation...
There has long been a concern to improve the techniques of image processing for PCB's inspection. However, it is noticed the focus is mainly on the inspection of PCB in mass production. Even with a low volume of production, the small series production has become increasingly relevant. This work presents an image processing pipeline for mounted PCB inspection in small series production, strongly based...
This paper presents a 10 years experience of data driven models for sensor validation applied for petroleum and natural gas industry. Auto-associative kernel regression has been used as the main modeling method. The models achieved were embedded in software called Sentinell, which is used for sensors diagnosis. The software is being used in a natural gas compression station, and it has been evaluated...
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