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Zhang, Dianhai,Ren, Ziyan,Koh, Chang-Seop Published by the Institute of Electrical and Elect 2014 IEEE transactions on magnetics Vol.50 No.2
This paper presents a systematical optimal design method for powder aligning fixture during forming process and magnetizing fixture during magnetizing process for an anisotropic-bonded NdFeB magnet. Before the forming process, the mixture ratio of magnet powder and resin, molding tool temperature, and filling density are selected to improve the magnetic performance. During the forming process, a newly multiobjective optimization model is proposed to obtain the required orientation and maximum aligning field. Thus, in the magnetizing process, an anisotropic-bonded NdFeB magnet with required orientation and high residual magnetic flux density is obtained by applying a single-objective optimization process. To accurately predict the residual magnetic flux density, the transient finite element method combined with the Jiles-Atherton hysteresis model, taking the aligning field into account.
Zhang, Dianhai,Jia, Mengfan,Liu, Yang,Ren, Ziyan,Koh, Chang-Seop IEEE 2018 IEEE transactions on magnetics Vol.54 No.3
<P>With the change of temperature, magnetic characteristics of electrical steel sheet (ESS) exhibit remarkable variations, in particular, at high-temperature region. If the magnetic field of electromagnetic devices operating under high temperature is analyzed by the magnetization data recorded under room temperature, the analysis findings appear to be quite different from the real ones. In order to understand and apply the real magnetic behavior in ESS, a temperature-dependent hysteresis model is quite necessary. In this paper, a physical background-based Jiles–Atherton (J–A) model is enhanced for revealing temperature effects through the introduction of temperature-dependent parameter on the base of observation of measurement data. In addition, the inaccuracy of J–A model in the range of weak applied field is enhanced with the use of variable parameter set. Ultimately, a comprehensive improvement algorithm of temperature-dependent J–A model is proposed followed by verification through experimental hysteresis data.</P>
Dianhai Zhang,Hyo-Jun Kim,Wei Li,Chang-Seop Koh IEEE 2013 IEEE transactions on magnetics Vol.49 No.5
<P>This paper proposes an algorithm to analyze the magnetizing process of a new anisotropic bonded NdFeB permanent magnet (PM) which is magnetized by a capacitor discharge impulse magnetizing fixture. In the algorithm, the magnetic field analysis and the prediction of the residual magnetic flux density are achieved by using the transient finite element method (FEM) incorporating the scalar Jiles-Atherton (J-A) hysteresis model. The validity of the suggested method is demonstrated by applying to a 4-pole ring-type anisotropic bonded NdFeB PM and comparing the numerical results with the experiment ones.</P>
Zhang, Dianhai,Ren, Ziyan,Koh, Chang-Seop The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper presents a multi-objective optimization approach to design rotor slot geometry of three-phase squirrel cage induction machine to achieve NEMA design D torque-speed (T-S) characteristics with high efficiency. The multi-objective Particle Swarm Optimization (MOPSO) algorithm combined with the adaptive response surface method and Latin hypercube sampling strategy is applied to obtain the Pareto optimal designs. In order to demonstrate the validity of the suggested optimal algorithm, an application to rotor slot design of three-phase induction motor is presented.
Dianhai Zhang,Ziyan Ren,Chang-Seop Koh 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper presents a multi-objective optimization approach to design rotor slot geometry of three-phase squirrel cage induction machine to achieve NEMA design D torque-speed (T-S) characteristics with high efficiency. The multi-objective Particle Swarm Optimization (MOPSO) algorithm combined with the adaptive response surface method and Latin hypercube sampling strategy is applied to obtain the Pareto optimal designs. In order to demonstrate the validity of the suggested optimal algorithm, an application to rotor slot design of three-phase induction motor is presented.
The Analysis of Anisotropic Bonded NdFeB Permanent Magnet Using an Improved JA Hysteresis Model
Dianhai Zhang,Ziyan Ren,Chang Seop Koh 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
An improved Jiles-Atherton hysteresis model for anisotropic bonded NdFeB permanent magnet which is based on the theory of ferromagnetic hysteresis is proposed. The proposed algorithm is used to simulate both major and minor loops for the PM and the result is good agree with measured ones.
Dianhai Zhang,Yu Han,Ziyan Ren,Yanli Zhang,Chang-Seop Koh 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
This paper presents a calculation method of residual magnetic flux density distribution for a four-pole anisotropic bonded NdFeB permanent magnet (PM) considering the effect of aligning magnetic field during the forming process. To manufacture the anisotropic bonded NdFeB magnet, the magnet powder needs to be aligned with a proper aligning field before magnetizing. Therefore, it is necessary to analyze the magnetizing process based on the aligning field analysis to determine accurate distribution of residual magnetic flux density (Br) for the anisotropic bonded NdFeB PM. In order to estimate the Br distribution of the anisotropic bonded NdFeB magnet, an analysis method by combining the external electric circuit equation coupled with the transient finite element method and the scalar Jiles-Atherton hysteresis model is proposed.