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In this paper, we present the performance of massively parallel processing in finite element electromagnetic field analyses with time periodic explicit error correction. The Domain decomposition technique is used for parallelization, and the Message Passing Interface (MPI) library is used for processing communications. Results show over a 64-fold speed increase compared with the sequential solver,...
The low-efficiency design method of traditional motor usually needs a long time, so Cloud Computing is introduced for the traditional FEM and BP neural network to reduce the time consuming. In this paper, the electromagnetic axial torque of permanent magnet synchronous motor (PMSM) is used as calculation case. The utilizing Cloud Computing curtails approximately 4 times hour to calculate this case...
This paper presents an electro-thermal based junction temperature (Tj) estimation method of insulated gate bipolar transistor (IGBT) power module. Firstly, the internal structure of IGBT and its transient characteristics are researched, through which the factors affecting the power loss as well as its basic influence rule are analyze and the multivariable loss calculation model is obtained. And then...
Mechanical characteristics analysis of normal and defective transformer windings with eccentric distance under short-circuit (SC) fault are conducted using three-dimensional finite element method (3-D FEM). The change characteristics of maximum stress and displacement of defective windings with different eccentric distances of high voltage winding are obtained. It is found that the increase of the...
Stator-permanent magnet machines have attracted more and more attention in the past decade due to the advantages of robust structure, high power density, high efficiency, etc. This paper is concerned with the strength analysis of salient rotor for the stator permanent magnet machines (SPMMs) with the influence of rotational speed and rotor temperature. Firstly, the rotor stress conditions were simplified...
The thrust and levitation force of the long stator linear synchronous motor (LSLSM) are key points to evaluate the performance of the maglev train. However, it is not easy to be achieved due to the non-linear and dynamic coupling characteristics between thrust and levitation force. In this paper, the finite element analysis model of long stator linear synchronous motor is built for analyzing the thrust...
Cable conductor temperature is the key condition to determine whether current in operation reaches to cable's ampacity. In order to optimize cable operation, it is important to calculate cable conductor temperature with high accuracy. A simple and quick method of calculating temperature field for double-circuit underground cables is introduced in this paper. The superpose principle is applied to establish...
The short-time high capacity reactive power output and quick dynamic response performance are two key performances of new large synchronous condenser. In this paper, the effect of load condition on transient response capability of synchronous condenser by finite element analysis (FEa) model. A 300/-150Mvar prototype synchronous condenser is provided for modeling analysis at a group of different steady...
This paper presents a novel experimental set up to measure the deformation in an iron sheet under the influence of electromagnetic field, and the results of Finite Element Analysis used for segregating the magnetic forces and magnetostriction induced mechanical deformation. The magnetic forces are calculated using the virtual work principle and the magnetostriction is modeled by means of an energy-based...
Linear permanent magnet (LPM) machines are used in various fields. In order to generate high thrust force, the size of LPM machine becomes large. Then, magnetic geared linear motor (MGLM) has been proposed. MGLM realizes a high thrust force and downsizing. This paper proposes a new design of MGLM. In addition, two designs of magnetization direction, axial direction and radial direction, are compared...
A bridge-like piezoelectric energy harvester which can be used for energy harvesting on large force load occasions is proposed in this paper. The harvester consists of two parts: piezoelectric stack and a bridge-like amplification mechanism. Basic working principles of the structure are elaborated in details. Finite element analysis based design is introduced in this paper to achieve higher output...
A novel tubular transverse-flux flux-reversal permanent magnet linear motor (TTFFRPMLM) for long stroke applications is designed and analyzed in this paper, which not only has the low cost advantage of the existing flux-reversal motor (FRM) by combining both PMs and armature coils in short primary, but also can address the problem of complicated structure of the existing transverse-flux motor (TFM)...
High-voltage disconnectors are the largest and most important primary device in the transformer substation. There are many problems during the closing of the disconnector, such as not in place, over the place, the contactor is loose and so on. This paper presents the Finite Element Analysis (FEA) of disconnector GW4D-126D(W) under different closing states performed by ANSYS Workbench. The experimental...
In this paper, a method of deep learning is built to reduce the needed time on performance analyze and optimization of permanent magnet synchronous motor (PMSM). The analysis of the electromagnetic speed, torque and efficiency of PMSM is carried on with Finite Element Method (FEM), which is 8 pole-pairs, 48 stator slots and 195mm of stator external diameter. FEM model of PMSM is established, and the...
The utilization of asynchronous induction machines applied in railway traction drives is much higher than those used with industrial drives. Since this applies to both electromagnetic and thermal parameters, a multi-physics optimization with respect to electromagnetic and thermal behaviour will be introduced into the industrial design process. The discussed optimization approach consists of a sequential...
In this paper, a proposed analytical model is introduced for acceptable optimization of an axial flux permanent magnet (AFPM) machines. Nowadays the finite-element model is one of the most powerful tool to analysis the electrical machine. However, sometimes this method can be very time-consuming for further optimization. Therefore, in this paper, a hybrid analytical model based on sub-domain algorithm...
The cogging torque of variable flux reluctance machines (VFRMs) is usually large, which will result in undesired vibrations and acoustic noises. This paper introduces several methods to reduce the cogging torque of VFRMs including asymmetrical rotor teeth, circumferential rotor teeth pairing, rotor teeth shaping and rotor dummy slots. First, the cogging torque of VFRMs are analytically calculated,...
In order to design electrical devices using coil or conductive media, an analysis of precise eddy current distributions is necessary. However, the distribution of eddy current inside a conductive media is somewhat complicated. In this paper, the eddy current distributions by finite element analysis inside a conductive media is analyzed. Based on the eddy current distributions of this paper, several...
Stirling power generating system, which has the advantages of multiple energies applicable and high efficiency, is promising for aerospace applications. As the main part of Stirling power generating system, single-phase oscillating permanent-magnet linear machine (PMLM) is investigated in this paper. Firstly, the electromagnetic performances, such as no-load back electromotive force (EMF) and thrust,...
A three-dimensional finite element model of miniature circuit breaker is established. The steady state temperature field is obtained by the method of electrothermal coupling, and the mechanism of overload protection is analyzed. The influence of wire size on the temperature of bimetal is studied. A simple and effective method to reduce the influence of external wire size is presented. The influence...
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