The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A finite element model is used for flexural vibration analysis of a static (non-rotating) rotor with two open cracks, and the stiffness matrices of the cracked elements are obtained using transfer matrix analysis and local flexibility theorem. Through numerical simulation, the effects of the slenderness ratio and the crack depth on the mode shapes and the changes in the eigenfrequencies of the cracked...
Due to low-accuracy of traditional magnetic circuit method with single magnetic loop and some approximate empirical formulas in the magnetic circuit calculation of non-salient pole synchronous generator, the distributed magnetic circuit method (DMCM) is put forward and adopted. The comparison of the results among traditional magnetic circuit method, DMCM and finite-element method (FEM) shows the validity...
Fault of the electrical system, for example unbalanced voltage condition and inconsistent frequency, is frequently occurred, which reduces quality of the electrical system and effects the efficiency of electrical appliances. This research is study of unbalanced voltage conditions on heat transfer of induction motor 3 phase by FEM and experimental method. Therefore the unbalanced voltage conditions...
This paper introduces a design method of line-start permanent magnet synchronous motor (LSPSM). The structure of stator lamination, rotor lamination and stator windings are designed. Finally, the starting process of the motor is simulated by ANSOFT according to its model. By simulation, the distribution of magnetic and the starting performance of motor are presented.
For the problem of analytical method has lower precision while numerical method consuming much time in calculating Line-start Solid Rotor Permanent Magnet Motor, this paper analysis and compares the advantages and disadvantages of these methods, using field and analytical collaboration method for analyzing a prototype. It calculates the no-load air-gap flux density, back-EMF, and full-load starting...
A novel doubly excited brushless machine (DEBM) with the radially laminated magnetic barrier rotor (RLMB-rotor) for variable speed system is built, and the prototype machine of 250kW/1200rpm has 10 rotor pole numbers. The performance studies of the sample machine are presented by using the 2D transient finite element analysis model and the experimental method. The magnetic fields, the electromagnetic...
This paper investigates the eddy-current loss in a surface mounted PM BLDC motor. The method is based on the 2-D finite element computation and the loss increase due to non-sinusoidal voltage supply is taken into account. Both eddy-current losses in stator core and in rotor permanent magnets are considered. The detailed equations for prediction of those eddy current losses are presented respectively...
The recent progress in soft magnetic composite (SMC) material has made it an alternative for motor armature core material to silicon steel. The manufacturing process of armature core made of SMC can be greatly simplified by extrusion moulding. Moreover, the isotropic characteristic of SMC enables more flexible structure designs for electric machines compared with the 2D flux distribution of traditional...
The gap between the rotor and the stator of the external circulation piston pump has an important impact on pump efficiency and operation reLiabiLity. Shaft and rotor are important parts of the external circulation piston pump. The gap value is determined by the shaft flexural deformation. According to the force of the rotor and shaft, the relevant module of the software ANSYS was appLied to give...
This paper describes a small wind turbine generation system with synchronous reluctance generator (SynRG). SynRGs are robust and inexpensive. In addition, SynRG has no cogging torque. Hence, wind turbine generation system with SynRG can achieve smooth start at low wind velocity. The rotor design of proposed SynRG is multi flux barrier type. With the finite element analysis (FEA) software, the characteristics...
The parameter of the Axial-Flux resolver is difficult to be calculated for its complete magnetic structure. By using analytical method, the conclusion is got that the resistance of the reluctance resolver is varied by changing its electro-magnetic coupling area. At the same time, by selecting appropriate shape of the inclined ring of the rotor, the output sine and cosine signal of the EMF is optimized...
This paper deals with optimum design criteria for maximum torque density & minimum current density of a single phase line-start permanent-magnet motor (LSPMM) using RSM (Response Surface Methodology) & FEM (Finite Element Method). The focus of this paper is to find a design solution through the comparison of torque density and minimum current density resulting from rotor shape variations....
In this paper, take the 150kW radial laminated magnetic-barrier rotor brushless doubly-fed machine as an example, the unit area radial force of its rotor has been calculated theoretically by the winding method, the comparison of radial forces of different rotor pole-pair (odd and even) have been realized by theoretical calculation and FEM simulation calculation that based on Ansoft software, two operations...
Induction motor is the main electrical machine for many applications because it has advantage sides. However, it may be affected by many problems for example the broken rotor bar problem. In recent year, many researches attempt to investigate the characteristics of induction motor with the broken rotor bar conditions. This paper aims to synthesis of stator current waveform of induction motor with...
In this paper, both analytical lumped-circuit method and finite element analysis are employed to predict the temperature rises of two identical prototype surface-mounted permanent magnet machines when they are back-to-back connected mechanically and used as a motor and a generator, respectively. The predicted results are validated by the experiment. The analysis reveals that the eddy current losses...
This paper presents a design and analysis of a novel permanent magnet embedded salient pole (PMESP) for PM synchronous wind generator (PMSWG). A lumped parameter magnetic circuit model (LPMCM) of the salient pole is established to design its main dimensions. The magnetic field distribution, electromagnetic performance and external characteristic of a 3MW generator with PMESP are analyzed by the finite...
To the permanent magnetic (PM) AC motor with the rotor aligned asymmetrically in axial direction, the motor magnetic field is axial-asymmetric. This asymmetric field generates unbalanced magnetic pull (UMP), and the analysis shows that, the UMP value varies in the motor operation. Analysis shows also that, if the number of stator slot is odd, the UMP center varies in the motor operation. The paper...
The objective of this paper is to present a series of novel doubly salient electromagnetic generator (DSEG) with multiple rotor poles for direct driven wind turbine. The 6k/4k-pole DSEGs are restricted in direct drive wind power application for the constraint between stator pole number and rotor pole number. Recent work by the authors shows a series of DSEG which the rotor pole number is more than...
This paper presents feasible options for generators in flywheel of diesel engine for small maritime application. An outer rotor permanent magnet (PM) machine with concentrated windings is preferred for this application since it has good integration in a flywheel, higher power density and efficiency than electrically excited synchronous generators, induction generators, etc. A nonlinear transient finite-element-method...
Flux-reversal machine (FRM) is a new doubly-salient stator-permanent magnet (PM) machine with flux linkage reversal in the stator concentrated windings. The simple structure makes it cost effective and suitable for mass production. Also, the FRM has permanent magnets parallel to the stator magnet flux lines and thus is much more difficult to demagnetize. However, in actual application fields such...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.