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The single-phase BLDCM(Brushless DC Motor) has many defects. This paper compares optimized single-phase BLDCM with existing commercial single-phase BLDCM and develops single-phase BLDCM with high efficiency, satisfying demanded power and torque in pump system. This paper presents the statistical optimum design of single-phase BLDCM for pump system by ANOVA(Analysis of Variance) to select effective...
In this paper, we propose an analytical method of polar anisotropic ferrite bonded magnet to outer rotor type brushless dc motor considering magnetizing process. The characteristics of polar anisotropic magnets are different from cored type ones which have uniform magnetization direction. Consequently, the magnetization directions of ferrite bonded magnet are analyzed by finite element analysis for...
In this paper, torque characteristics analysis of synchronous reluctance motor by winding function theory is described. The stator is same as one of the induction motor but rotor have two differential geometries of the flux barrier to reduce the torque ripple. The flux barriers were designed by optimization algorism considering torque ripple. Inductances for the separate part of the rotor were calculated...
A general method to model rotary machines using finite-element method (FEM) of transient magnetic field computation is presented. The merits of the proposed methods are that the nonlinear iteration on the rotor position is avoided; a curvilinear element is used in the two sides of the sliding surface; the methods being proposed to deal with matching boundaries and periodic boundaries are very general,...
This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear...
This paper proposes rotor flux barriers of an interior permanent magnet synchronous motor (IPMSM) to minimize additional losses caused by harmonics of flux density. To obtain sinusoidal flux distribution in air gap, a flux barrier shaped like a rib is introduced and an equivalent magnetic circuit is employed to design the barriers shape. Finally an IPMSM with the determined barrier is analyzed by...
It is well-known that cogging torque is difficult to be precisely computed in fractional-slot permanent magnet (PM) machines even using finite-element method (FEM). In this paper an improved and simple method of cogging torque computation with normal-size mesh elements in FEM is presented. The main merit is that the accuracy is guaranteed, complicated mesh refinement work is avoided and computing...
The paper presents a new successful design of a double rotor permanent magnet synchronous machine, where special attention was paid to the outer and inner rotor construction. The machine's structure enables its use in hybrid electric vehicles as a four-quadrant drive system as well as in pure electric vehicles as a single traction motor/generator. Thus, high torque density and low torque ripple values...
This paper deals with the study of interturn short circuits in rotor windings of a synchronous generator using FEM. Results obtained for magnetostatic and magnetodynamic cases are presented and discussed.
Recently, series-hybrid drivetrains are given more emphasis over parallel-hybrid drivetrains due to their simplicity, freedom in implementation and higher efficiency. However, the modeling phase of such machines takes either long calculation time with numerical methods such as Finite Element Analysis (FEA) or produces low accurate results with Magnetic Equivalent Circuit (MEC) models. In this paper...
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. The paper presents finite element analyses of a such a machine in terms of a comparison of both Y- and Δ-connected stator windings. The influence on the most important design parameters such as electromagnetic torque...
Direct and inverse analytical models of the switched reluctance motor (SRM) based on finite element method (FEM) results are presented in the paper. The models are obtained using three flux-current characteristics, which can be calculated from 2D-FEM or obtained on a test bench. The models can also be simplified for use in real time control. The model accuracy and versatility in characterizing the...
Doubly-Fed Induction Generators (DFIGs) are widely used for modern wind turbines. Although the stator winding of DFIG is directly connected to a grid while a rotor winding is connected to converters, it has a large outer size because of the high current in the stator winding. This paper proposes a grid-connected to a rotor type DFIG where rotor winding is connected to the grid instead of stator winding...
This paper deals with the electromagnetic performance evaluation of synchronous generator with outer PM rotor for small-scale wind power system. The results obtained by analytical techniques are validated by comparison with those by nonlinear finite element method (FEM) and experiments considering wind power turbine characteristics.
A single phase LSPM (Line-Start Permanent Magnet Motor) has been investigated to improve the efficiency. Single phase LSPM has a permanent magnet (PM) inserted rotor which generates magnet torque and reluctance torque. The torques fluctuate due to asynchronous motion during transient state. The torques act as a breaking torque which make the motor not to start. To obtain good design of single phase...
The research proposes a solution for the sensorless control of Surface Mounted PM motors at zero speed. A creative strategy that involves minor change in the rotor is presented. The proposed FEA serves to evaluate the effectiveness of the strategy quickly and accurately down to very low speed.
A multiphysical algorithm for modeling and design of magnetic bearings (MB) has been developed. The presented parametric algorithm can be used for designing a magnetic bearing or predict the behavior of an already known system. The presentation includes a detailed description of the computation algorithm, simulation results, and derived design criteria. The simulation results are evaluated by measurements.
In switched reluctance motors, rotor position information can be extracted from the measurement of position-dependent phase voltage resonances. Due to hysteresis in the magnetic core of the machine, subsequently triggered resonances can exhibit different resonance waveforms, even when the rotor is held at a constant angular position. In order to analyze the influence of hysteresis, a finite-difference...
Permanent Magnet (PM) machines constitute a favored drive choice in electric traction applications due to their increased efficiency. Design optimization of such machines could enhance their ability to satisfy contradictory static and dynamic requirements. In this paper a Differential Evolution (DE) algorithm for PM machine design optimization, coupled with a finite element analysis (FEA) is employed.
Novel moving least-square (MLS) approximation based shape functions are constructed for triangular element with variable nodes. The new shape functions are applied to deal with the sliding-surface for modeling the rotation of electric machines. Numerical result shows that the new method is accurate and valid in dealing with non-conform meshes.
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