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 ensure the starting performance of the single-phase induction motor with three parallel-connected windings, the transient performances and starting methods are studied in this paper. At first, the transient mathematical model of the motor is established according to the electromagnetic relations, and the simulation analysis is performed. Then two starting methods are proposed and studied. The first...
To ensure the transient performances of the singlephase induction motor with three parallel-connected windings, the simulated and experimental researches are carried out detailedly in this paper. At first, the transient simulation model of the motor is established and the simulation analysis is performed. Then the experiments are performed on the prototype motor, to verify the validity of the above...
When the line-start permanent magnet synchronous motor (LSPMSM) operates stably, sudden change of load torque may result in out-of-step and supersynchronous faults. The currents in stator windings and rotor bars will increase under the two faults, so will the strength of demagnetization field, which is likely to cause the irreversible demagnetization of permanent magnets in LSPMSM. This paper adopts...
Permanent magnet (PM) of the high speed permanent magnet machine has to be protected to resist the huge centrifugal force. One of the mature protective measure is to retain the PM with the nonmagnetic alloy sleeve. However, the rotor eddy-current losses would increase meantime. Decreasing the sleeve thickness would reduce the eddy-current losses of the machine but decrease the mechanical strength...
In order to study the effect of removing the filter capacitor in the rectifier circuit on the steady-state performances of the permanent magnet direct current motor, simulation analysis and experimental research were accomplished according to a rated voltage 300V DC, 180W, 2-poles permanent magnet direct current motor. The motor was fed by three different methods. The first method is to use standard...
Linear switch reluctance machine (LSRM) has been a promising alternative for linear application systems despite its low force density and high force ripples. In long stroke conveyor applications, the stator of LSRM should be laminated requiring no gap or interruptions, being a difficulty in practical use. This paper presents a dual stator LSRM with magnetically isolated rectangular segments. The presented...
This paper discussed an improved structure of a hybrid excitation brushless claw-pole alternator (HEBCA). The alternator flux regulation and operation performance is simulated based on 3-D FEM. Finally, a series of experimental tests carried out on a prototype are made to verify flexible control of the flux as well as machine power production capability.
This paper presents the design and analysis of a novel three-phase rotary transformer that can be used to replace the brushes and slip rings of the doubly fed induction generators (DFIG). Design aspects of the transformer cores are investigated to ensure easy manufacturing and a relatively constant reluctance while the secondary of the transformer is rotating. Guidelines for the air-gap, stator and...
A kind of 5MW Permanent Magnet Synchronous Generator (PMSG) is designed in this paper, which structure and main parameters is determined through the analysis of key design technology of PMSG. By combining the analytical method and finite element method (FEM) to analyze the factors influencing the cogging torque, several methods are obtained to reduce the cogging torque, so as to optimize the structure...
Comparing to original three-phase induction motor, the three-winding series-connected single-phase motor can achieve approximately rated efficiency and higher power factor. This paper presented the simulation and analysis of the operational process of the motor under run-capacitor breakdown, capacitors disconnection and rotor bar breakage faults. Mathematic and numerical simulation models of the motor...
Two kinds of mechanism that cause Sub-synchronous Oscillation (SSO) by High Voltage Direct Current (HVDC) are introduced in this paper. The Unit Interaction Factor (UIF) and the test signal method are used to analyze SSO that caused by HVDC. The results show that when UIF>0.1, the simulation model takes the risk of SSO. Then, supplementary excitation damping controller (SEDC) is used to suppress...
Line-start permanent magnet synchronous motor (LSPMSM) has the advantages of high efficiency and power factor, compared with the electrically-excited motor, and is used in more and more applications. The reverse rotation of LSPMSM is caused by swapping two-phase voltages during the normal operation of three-phase LSPMSM, and it will cause large currents in stator windings and rotor bars, which may...
During the starting process of line-start permanent magnet synchronous motor (LSPMSM), the strength of demagnetization field produced by currents in stator windings and rotor bars varies with time, so does the operating point of permanent magnets. Existing studies mostly adopt finite element method (FEM) to study the variation of magnets' operating point in LSPMSM during the starting process. But...
Marine wave energy is a promising renewable source of energy in the world since it is characterized by high power density and worldwide distribution. Alternative to the well know permanent magnet linear synchronous machine and linear induction machine, a high power density tubular linear switch reluctance machine (TLSRM) is presented in this paper as direct drive marine wave energy generator. The...
For the design and analysis of an electrical motor, an analytical solution of electric and magnetic fields is barely achieved with the required accuracy. Although well-known finite element analysis (FEM) tools can compute these different multi-physical motor characteristics, coupling them can be difficult and often prohibitive in terms of computational time particularly in optimization processes....
In chemical industry, coaxial unit is widely used for flue gas recovery, which consists of a blower, a three-phase asynchronous machine and a turbine. The model could be simulated by MATLAB/Simulink. The operation of the machine could be simulated if the flue gas grows up gradually and becomes more than the demand of the load. The current, speed and electromagnetic torque were recorded and analyzed...
The paper presents an improved magnetic field division method based on parabola arc equation for calculating air gap permeance in doubly salient motor, which could gain more effective and precise result on calculating equivalent magnetic circuit for complex stator or rotor profile. Taking the switched reluctance motor (SRM) with slot on each side of the rotor tooth for example, this paper have calculated...
A novel rotor structure is present in this paper, it make single-phase flux switching motor (FSM) have the ability of starting itself. The rotor is asymmetrical along its pole axis, so 2D finite element analysis (FEA) is incapable to analyze it directly. With the help of 2D FEA results of normal rotor FSM, an inductance modeling method is introduced in this paper also. Finally, 3D FEA is carried out,...
In this paper, the analytical model of flux reversal machine with four permanent magnets on one stator tooth and different winding topologies including the concentrated winding and the distributed windings are presented. The electromagnetic performance such as the flux density, flux linkage, back-EMF and the electromagnetic torque are compared. It is found that the power density of flux reversal machine...
Linear switched reluctance machine (LSRM) offer advantages to be used in harsh conditions and low cost applications, but subject to low force density because of the nature of force production which resemble the well-known rotary SRM. A new kind of LSRM with different structure and magnetic circuit topology is presented in this paper. The presented machine incorporates a simple concentric winding and...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.