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This article presents the design of a electromechanical energy conversion composed by an electromagnetic device that uses a maritime buoy vertical oscillation as a source of prime energy to feed a flashing system of a signaling buoy called eclipsor. The eclipsor's load curve is obtained and the input power is calculated. The construction of a radial permanent magnets brushless, slotless, double-rotor...
This paper presents a brief overview about wireless charging technology developed for electric and plugin hybrid vehicles. Presented technology is a complete solution which includes power transfer, foreign object detection, live objects protection and required communication capabilities. Developed technology is very flexible, easy to use and can be easily adopted for various cars. Used multi-coil...
The paper describes the new designs of ships, where instead of a conventional steering wheel, steering rotary gondolas used. In this case there is a combination of propulsion and steering complex. In practice to realize such complex with a mechanical power is difficult. The most practical to create ships with steering gondolas with an electric power transmission, forming electric propulsion system,...
A key factor in the design of photovoltaic fields is their yearly productivity and normally the nominal power is the only module parameter taken into account in the productivity predictions. The present paper intends to demonstrate how this approach disregards an important parameter, the nominal fill factor, that may significantly affect module efficiency when working in realistic environmental conditions...
Many technologies are being developed and improved to supply the world growing demand for electricity. One of these technologies is the Ocean Thermal Energy Conversion (OTEC), which makes use of vertical ocean temperature gradients to produce energy. Its resources are very large, but restricted to the tropical oceans. Here our objective is to map and discuss important characteristics of Northeast...
In this paper, a mathematical analysis of a photovoltaic cell is presented for the single diode and double diode cell configurations. The model of the double diode representation was implemented using a proprietary algorithm and MATLAB/Simulink. To track the point of maximum power, the perturb and observe (P&O) algorithm method was implemented. It was shown that the point of maximum power is always...
Dynamic characteristic is important to machine design and controller design of a permanent magnet synchronous machine (PMSM). In this paper, an experiment and corresponding test bench for estimating the dynamic characteristic of a PMSM is proposed, which is suitable for apply various variable load torque to the tested machine. The experimental platform consists of two PMSMs, one of them called tested...
This paper provides a new methodology for the characterization of defect size in a conductive nonmagnetic plate from the measurement of the impedance variations. The methodology is based on Finite Element Method (FEM) combined with the Multi Output Support Vector Machines (MO-SVM). The MO-SVM is a statistical learning method that has good generalization capability and learning performance. FEM is...
The output power of wave energy farms may be very fluctuating, which may give rise to power quality issues such as flicker. However, although there existed a method for estimating the flicker level generated by a wave energy farm in relation to its short-circuit ratio (as described in IEC standard 61400-21), until recently, no method had been defined yet regarding the two other major parameters on...
The paper outlines a wind turbine coupled to a permanent magnets synchronous generator (PMSG). The PMSG is not located in the horizontal axis of the turbine, but in the blades' tip instead. The basic magnetic topology is constituted by sixty magnets mounted on the surface of the rotor and a conventional stator winding. This wind generator is coupled to a shroud that can increase power output and is...
Today, direct control strategies are more and more demanded in high dynamic performances, since they offer superior dynamic response. One of the major concerns in these methodologies is the estimation of rotor flux which plays an important role in conventional rotor flux position-based direct power control (DPC) methods. Recently there have been more interests on stator flux position-based DPC and...
Topical technological advances in power electronics and regulation systems have provided an opportunity for designing a high-efficiency PV system. High performance DC/DC converters should be developed to connect the low-voltage PV system to the high voltage DC-bus. These converters are used to regulate the output voltage and current of the PV system, to control the power flow and to track the maximum...
Motorcycles with electric drive are a clear advantage for cities, because of locally no emissions and driving with minimum noise pollution. This is especially known in South-East-Asian cities with strong motorcycle traffic [1]. But pure battery electric motorcycles have a significant range problem. This problem can be overcome with a hydrogen fuel cell hybrid system. Motorcycles in city driving have...
Electrical traction motors face challenging torque-speed requirements. DC-excited flux switching machine (FSM) offers inherently a good torque capability along with an effective controllability thanks to its DC field windings. These machines have been evaluated mainly over their performance with little consideration on their control. This paper proposes a control strategy, applied on a 3-phase 6/5...
Hysteresis current controllers, in comparison with PI controllers can be implemented easier and their application has been widely used in vector control of electrical AC drives due to smoothing a small part of computational complexities. In such systems, due to the nature of these controllers, the common PI current controllers used in the cascaded control scheme can be replaced with hysteresis current...
The paper presents a new type of rotor position observer using cross and dot products of the estimated and measured rotor current vector. A novel synchronization error function contains modified function atan2 and the vector products. The modification of error function is aimed at making the function monotonic, what provides faster response of the observer. Two rotor speed and position observers with...
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