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.
To calculate the fatigue life of shield ring following steps untaken: First, obtain the dynamic characteristics by using image recognition method and the finite element method. Second, calculate fatigue life cycle on the basis of the time-domain analysis results of vortex-induced resonance. Third, estimate the fatigue life of shield ring considering the probability of wind speed. Finally, design a...
Torque calculation using the d-q axis has the advantage of faster execution time; however, the torque ripple cannot be considered in torque calculation using the d-q axis equivalent circuit because the time-dependent component is removed. In this work, with d-q transformation, the characteristics of some parameters were identified. These characteristics were considered for representing torque ripple...
In this paper, a new double-sided linear flux-switching permanent magnet (DLFSPM) motor for electromagnetic launch system is proposed, in which the mover only consists of yokeless iron while the permanent magnets and armature windings are all located on the stator. Hence, this motor incorporates the merits of high thrust density of permanent magnet linear motor and high reliability of linear induction...
Accurate lithium-ion battery power capability prediction gives an indication for managing power flows in or out of batteries within the safe operating area, which is one of the primary challenging functions of battery management systems (BMSs). The battery direct current resistance (DCR) is typically employed for power capability prediction, but its characteristic depends significantly on the ambient...
In order to increase the efficiency of enterprise and reduce the grid load demand of large-scale renewable energy such as wind and solar energy in regional power grid system, Shapley value method has been proposed to analyze the cooperation game relationship between high energy-consuming customer and power system. Using the system dynamics method, an interaction analysis model for describing participation...
A fractional-order analysis model of the chaotic oscillation in a 4D power system including synchronous generator exciter is presented in this paper. The dynamics of the system are investigated by using this model. Firstly, the minimum order for the occurrence of bifurcations was calculated from the invariant system parameter set. Then, the influence of the parameter variations on the dynamics of...
In this paper, a novel single-phase hybrid switched reluctance motor (HSRM) is proposed for hammer breaker application. The hammer breaker requires only unidirectional rotation and high speed operation without torque dead-zone. To satisfy the requirements, the rotor of the 4/4poles proposed SRM is designed with wider rotor pole arc and non-uniform air-gap is applied on the rotor. This motor has a...
A method for the time-step analysis of single-phase induction motors is proposed. The unknown variables in the differential equations are the currents flowing through the rotor bars. They are coupled with the distributed magnetic flux densities in the air gap instead of the inductance matrix while applying Kirchhofes and Faraday's induction laws. Two patterns for magnetic flux densities are necessary...
This paper presents an inrush current reduction method for a 1/2 HP (0.4 kW), 220 V, 4.8 A, 4 poles single phase split-phase type induction generator when connected to a grid using single-phase voltage control with power electronic equipment. A study and analysis of relationship between voltage, current and real power by laboratory tests under direct on line and soft connection conditions are given...
This paper proposes an end-effect equivalent 2D model to analyze back-EMF of high speed permanent magnet synchronous motor(PMSM) in order to consider a leakage flux in the end region of stator and air-gap. Since 2D FEA does not provide a precise analyzing result of back-EMF calculation due to the long airgap, an equivalent back-EMF simulation method is proposed. The proposed model of back-EMF analysis...
This paper proposed a new Power Electronic Transformer (PET) topology in medium and high voltage application of 3-phase AC distribution network. In the proposed topology, diode clamped multilevel converter is used as the rectifier stage, and input series output parallel (ISOP) Dual Active Bridges are adopted for isolated voltage conversion. The proposed topology is suitable for medium and high voltage...
Brushless Doubly-Fed Induction Generator (BDFIG) is potential for power generation applications for its high reliability and low maintenance cost. Realization of Vector Control (VC) for stand-alone Doubly Fed Induction Generator (BDFIG) system requires the exact synchronous rotating d-q transformations. However, such a d-q transformation is complicated since a BDFIG contains two stator windings and...
Calculation and matching of the main parameters of a brushless DC (BLDC) motor for a Battery electric vehicle (EV) is studied in this paper. Usually, different shapes of permanent magnet (PM) and different magnetizing methods will affect the performance of the motor. Especially when the motor is designed for an EV, more elements need to be considered, such as efficiency under normal operating conditions...
The high temperature superconducting (HTS) cable has a wide application prospect in the future power grid because of its low loss, large capacity and friendly environment. Since without AC loss, the HTS DC cable has a longer cooling distance, and is more suitable for large capacity and long distance transmission. In the near future, with large-scale application of renewable energy, HTS DC cable is...
In this paper, an auxiliary power unit (APU) for railroad car, which is applied a resonant DC/DC converter and a single-switch boost converter with SiC device, is proposed. The proposed circuit adopts SiC device in order to overcome disadvantages of IGBT. Compared to IGBT, since SiC has smaller switching loss, SiC can be operated at higher switching frequency. Therefore, the proposed APU with SiC...
Inrush current caused by residual flux is the main reason that makes transformers fail to be re-energized. The concept of calculating transformer residual flux by the integration of the port-voltage after de-energization was proposed previously. In this paper, the principle of the concept is analyzed using phasor method. The concrete implementation is put forward, including two methods of determining...
Permanent-magnet (PM) direct-drive radial-axial flow turbine generator is widely used in the field of low-grade waste heat (below 200 °) Organic Rankine Cycle (ORC) power generation. However, special mechanical balance devices are needed to suppress the axial force produced by radial-axial turbine under the high-speed operation, resulting in not only the complex structure of the generator, but also...
Overload performance of permanent magnet motor is very important for some special occasions, which has been generally limited by temperature rise of stator. This paper introduces a new method based on heat storage of phase change paraffin to enhance the overload performance of motor. The heat variation of motor was analyzed under overload process, and the key affecting factors were given to control...
Two linear hall sensors are utilized to detect the mover position of permanent magnet linear motor (PMLM) in this paper. To eliminate the harmonics of the sensor signals, suboptimal multiple fading Kalman filter (SMFEKF) is utilized to estimate the mover position. The third-order harmonic is considered into the observation model of SMFEKF, and high-order harmonics are considered as measurement noise...
In virtual flux droop method, power sharing is achieved by adjusting flux amplitude and angle which has some advantages of simplicity of control and lower voltage and frequency deviation. In this paper, a switch module of power calculation was firstly designed to balance system dynamic response and power fluctuation in flux droop controller. Then an improved direct flux controller was proposed to...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.