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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...
This paper presents modeling of coreloss resistance for d-q equivalent circuit analysis of IPMSM considering harmonic linkage flux. High efficiency is one of major advantage of IPMSM, therefore precise loss analysis is required for high efficiency design. However, there is practical limitation of d-q equivalent circuit analysis due to harmonic linkage flux especially at high speed region where field...
Summary form of only given: To reduce the detent force by end effect, the auxiliary core which has the independent magnetic circuit is proposed in this paper. The auxiliary core is designed by the DOE (Design of Experiment) and FEA. And the prototype machine of auxiliary core is made and experimented. To demonstrate reduction effect of the detent force by the auxiliary core, the experimental results...
To improve the performance of permanent magnet (PM) machines, quasi-Halbach PM arrays are used to increase the magnetic loading in these machines. In tubular PM actuators, these arrays are often approximated using segmented magnets resulting in a 3D magnetic field effect. This paper describes the results of this segmentation obtained from an analytical model.
This paper presents a 2D dynamic model of a ferrite inductor with an RM type core capable of reproducing the nonlinear effects of the core material, such as saturation and power losses, using 2D Finite Element simulations in the time-domain. Thus the computational cost is greately reduced. The effectiveness of the model is explored in the case of an inductor excited by a sinusoidal voltage source...
This paper presents a model of large air gap transformer composed of two E cores. Approach is based on the magnetic equivalent circuit using reluctance network and considers two and three dimensions phenomena. Thanks to this analytic model, it is possible to determine rapidly and easily electrical parameters of a two windings transformer in order to design such magnetic devices. Finally, 2D and 3D...
A new and simple formulation of equivalent conductivity in the direction normal to the laminations is derived by analyzing and comparing the electromagnetic fields and the eddy current losses in a laminated iron core and a single lamination. Then the anisotropic conductivity tensor is updated. The conductivity formulation can make it easier to calculate numerically three-dimensional eddy current fields...
We propose a BIE to solve multiply connected problems with one unknown of the double layer charge. Since the double layer charge produces only the potential gap without disturbing the normal magnetic flux density, it offers the generic formulation for both the single and multiply connected problems including robust treatment of geometrical singularities and arbitrary magnetic permeability.
To detect an electrical fault in a generator magnetic core with the ELCID method, a circulation of the magnetic field between two teeth is determined. To model this problem with the FEM, two potential formulations can be used. With the scalar formulation, such circulation can be easily determined; this is not the case with the vector potential formulation. In this paper we propose to use a supplementary...
The post 1-D analysis for laminated cores is developed for accurate estimation of torque and loss in rotating machines. The nonlinear eddy current analysis along the thickness of the electrical steel sheets in the core is carried out at each element in the main finite element analysis in order to estimate the loss and the harmonic torques caused by the eddy currents and the hysteresis phenomenon in...
The induction planar actuator (IPA) in study is an electromagnetic structure formed by a static ferromagnetic core with an aluminium plate that corresponds to the secondary, and a mover, also called primary; the latter comprehends two sets of three-phase windings that are orthogonal to each other. When they are fed by a three-phase ac excitation, a moving magnetic field is established; it can travel...
The effect of the B-H and Bm-Wt curves under different dc-biased magnetization on iron loss and flux in Si-Fe lamination obtained by a laminated core model is investigated, which has been demonstrated via the numerical modeling results based on model.
This paper presented a novel network model for dynamic stray capacitance calculation of planar inductor with matrix structure, of which the nanocrystal magnetic material was used to consist of its magnetic core. The magnetic core was taken into account to be one part of this dynamic capacitance network model in high frequency, and its electric potential was considered to be suspended. To calculate...
A crucible induction furnace is modeling with a coupled magneto-thermal formulation using the finite element method. For high frequencies, eddy-currents can appear as currents flowing at the core surface as well as between the laminates in the core. The calculation of eddy current loss requires a very dense mesh in the conductor regions. To avoid the problem with the dense mesh, this paper uses a...
This paper presents the thermal analysis of a transverse flux rotary machine (TFRM) with two types of stator, which is studied for high torque direct drive motor applications. Due to the high pole number and highly saturated cores, the core losses are one of the major heat sources with an armature copper loss. Therefore, it is important to be able to calculate the core losses accurately, and reduce...
Based on the core loss analysis that used the finite element method and E&SS model, this paper had conducted a two-dimensional heat transfer analysis with hysteresis loss as its heat source and clarified the heat distribution within the test piece. Core loss is reported to vary according to magnetic anisotropy and magnetic flux conditions. By using the finite element method and the E&SS model...
In the past, the stator core loss was considered as a whole or sub-blocks heat source in the temperature field calculation, while the actual loss was distributed throughout the core. Consequently, this approach resulted in calculation error. To reduce the error, a magnetic-thermal element coupling algorithm is presented. Elements loss, calculated in 2D magnetic field by using FEM, is coupled to the...
A new coupling method was presented to analyze the electromagnetic-thermal coupling problem on the basis of the mechanism of coupled field. Aim at the high temperature field, as well as the quickly changing current,the simulation model was established. Different performance of the stiffness and damping characteristics under different vibration amplitude for a self-decoupling magneto-rheological(MR)...
For the design of an IPM motor with small torque ripple and large driving torque, the optimal design method called the ON/OFF method is attractive, because new magnetic circuit, which we could not imagined beforehand, may be obtained. In this paper, a non-parametric optimization technique to find a new magnetic circuit which minimize a torque ripple and maximize a driving torque of IPM motor is examined...
IPMSM has been often developed for HEV because it has a high power density and a wide range of operations. However, an armature reaction occurs from the high current and also the hysteresis loss from electrical steel of rotor and stator and the magnet is pretty high due to the high speed driving. Moreover, for IPMSM, there are hardly any accurate specifications or studies to verify the loss through...
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