Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
This paper proposes an original electrical losses minimization technique (ELMT) suitably devised for field oriented controlled (FOC) linear induction motor (LIM) drives, taking into consideration the LIM's dynamic end-effects. The proposed technique improves the very few approaches in the scientific literature dealing with ELMTs applied to LIMs in the following aspects: 1) it accounts for the LIM...
The emergence of wide-bandgap power devices such as silicon carbide (SiC) MOSFETs can achieve much faster switching speeds, hence lower switching loss, than conventional silicon (Si) IGBTs. However, the faster switching speed, hence higher dv/dt can cause increased turn-on current overshoot, ringing and EMI due to the parasitic capacitance in the system. In this paper, the parasitic capacitance of...
The fine analysis of rotor losses of induction motors requires separation of the slip- and high-frequency electromagnetic quantities under load conditions. However, the conventional method involves a full slip-cycle finite element simulation, which is very expensive in terms of CPU time and memory usage. To obtain a precise iron loss prediction with reduced time consumption, this paper proposes three...
This paper, starting from recent papers in the scientific literature dealing with Induction Motor (IM) dynamic modelling, as a first step, improves its space-vector dynamic model, including both the magnetic saturation and iron losses; particularly it takes into account the dependence of the magnetic saturation by the stator leakage inductance, as a further effect of the load. Afterwards, it proposes...
This paper proposes a three-phase AC filter inductor, which uses two soft magnetic materials, for use in three-phase pulse-width modulated (PWM) inverters. This inductor features loss reduction, achieves the same volume as conventional inductors, and has good inductance balance in each phase. First, a three-phase inductor that provides the same value of inductance in each phase is designed. Then,...
Aiming at the characteristics of UAV high-speed permanent magnet motor, wide speed range, large current and parameter variation, an online efficiency optimal control method is proposed based on model reference adaptive (MRAS) algorithm. The MRAS-based approach can identify the machine parameters according to different operation conditions, optimizing the stator current constantly and improving the...
Firstly, the composition and principle of the single cone scanning infrared earth-sensor is introduced. Secondly, the relationship of the pitch angle with rolling total-chord in different orbit altitudes is modeled. It is explained by simulation that, the traditional attitude determination algorithm is low in attitude accuracy because of the large orbit eccentricity. Thirdly, an improved algorithm...
The internal model control (IMC) has been widely used for its simple structure, but its control performance has a relationship with the filter order and time constant directly, so that its disturbance rejection performance is influenced in the permanent magnet synchronous motor (PMSM) drive system. An IMC with extended state observer (ESO) is proposed in this paper. Based on the mechanism of IMC and...
In this paper a method to consider saturation behavior of induction machines during the finite element (FE) analysis of high frequency excitations is developed. This saturation behavior manifests itself in an additional saturation and intermodulation harmonic, when evaluating the current response related to a high frequency voltage excitation. In order to correctly reproduce these harmonics within...
The possibility of applying low-cost ferrite magnets in a direct-on-line-start permanent-magnet-assisted synchronous reluctance machine (DOL PMaSynRM) for industrial applications, such as pump or ventilation systems was studied. The main target of this machine topology was to achieve a higher efficiency class compared to a counterpart induction machine (IM). Because of the weak properties of the ferrite...
This paper describes the reduction of chattering in functional electrical stimulation (FES) with Smith compensator. We proposed a bilateral controller using FES. In the bilateral controller, in addition to normal remote control, the reaction forces of the distant location are transmitted back to the operator. Therefore, the operator feels like being in the distant location. In controlling of the human...
This paper discusses high-voltage, high-speed permanent magnet generators and their possible applications: space and aviation aircrafts, ships, mobile installations, etc. The main qualitative criteria for the electrical machinery power supply systems for spacecraft are determined. Different design topologies of the high-voltage, high-speed permanent magnet generators are reviewed and the optimal option...
Education needs to provide the means and resources to respond to new forms of education in which Information and Communication Technologies are implicit. Teaching experiences that make innovative and creative use of technology underlie a series of common ideas and pedagogical approaches that seek to harness the full potential of these technologies, framed in a new culture of learning. These are called...
In this work, super twisting controller is tested for paraplegic knee stimulation. In contrary to the literature controllers proposed for the paraplegic patient, our command assures a uniform global convergence using the Lyapunov function. We studied, firstly, the performances of the controller by comparing them with those of literature. Then, we proposed an adaptive super twisting controller assuring...
Shared-memory multi-core platforms are changing the nature of Parallel Discrete Event Simulation (PDES) because of the possibility to fully share the workload of events to be processed across threads. In this context, one rising PDES paradigm — referred to as share-everything PDES — is no longer based on the concept of (temporary) biding of simulation objects to worker threads. Rather, each worker...
The increasing diffusion of shared-memory multi-core machines has given rise to a change in the design of Parallel Discrete Event Simulation (PDES) platforms. In particular, the possibility to share large amounts of memory by many worker threads has lead to a boost in the adoption of non-blocking coordination algorithms, which have been proven to offer higher scalability when compared to their blocking...
Upper limb prostheses controlled with Pattern Recognition (PR) and myoelectric signals have great promise for amputees who lost an upper limb since it can control large number of movements intuitively. One of the existing challenges with such PR systems include the need to develop new feature extraction techniques to facilitate clinical implementation of PR systems to satisfy amputees' needs. In this...
Control reliability of interior permanent magnet generator (IPMG) depends on accurate knowledge of the generator outputs (torque, currents etc.) and model parameters (resistance, inductances etc.). These outputs and parameters can be obtained by measurements or can be estimated. Reducing measurement equipment, cost of the control system is reduced as well. On the other hand, if control system contains...
This study present an intervention combining an electroencephalography-based brain computer interface with a hybrid robotic system for the modulation of the cortical excitability (plasticity). Plasticity is intended to be elicited through the association of the voluntary motor-related cortical processes with the hybrid assistance during the execution of reaching movement. The cortical excitability...
Wireless Sensor Networks (WSNs) are playing remarkable contribution in real time decision making by actuating the surroundings of environment. As a consequence, the contemporary agriculture is now using WSNs technology for better crop production, such as irrigation scheduling based on moisture level data sensed by the sensors. Since WSNs are deployed in constraints environment, the life time of sensors...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.