基于ANSOFT的磁性材料core loss模型研究

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ANSOFT学习资料 ANSOFT是一种基于有限元方法的仿真软件，广泛应用于电磁场、热场、结构场等多个领域。下面是根据提供的文件信息，生成的相关知识点： 1. ANSOFT软件介绍 ANSOFT是一种专业的仿真软件，主要应用于电磁场、热场、结构场等领域。它通过有限元方法对复杂系统进行仿真，帮助用户设计和优化产品。 2. Core Loss Model Core loss是指磁芯中的磁损耗，\Core loss model是指对磁芯中的磁损耗进行建模和模拟的方法。动态磁芯损耗模型（Dynamic Core Loss Model）是指在瞬态有限元分析中对磁芯损耗的模拟和估算。 3. Finite Element Analysis Finite Element Analysis（有限元分析）是一种数值分析方法，用于解决偏微分方程组。它通过将研究区域离散成有限个元素，对每个元素进行计算，最后对结果进行组合，获得研究区域的整体结果。 4. Soft Ferromagnetic Materials Soft Ferromagnetic Materials（软铁磁材料）是一种磁性材料，具有高磁导率和低磁阻抗的特点。这些材料广泛应用于电磁场、磁记录、磁存储等领域。 5. Power Ferrite Materials Power Ferrite Materials（功率铁氧体材料）是一种磁性材料，具有高磁导率和高磁阻抗的特点。这些材料广泛应用于电磁场、磁记录、磁存储等领域。 6. Hysteresis Loop Hysteresis Loop（磁滞环）是指磁场强度和磁感应强度之间的关系图形。磁滞环是磁性材料的基本特性之一，反映了磁性材料的磁滞性能。 7. Minor Loop Minor Loop（小磁滞环）是指磁滞环中的一个小闭环，反映了磁性材料在小磁场强度下的磁滞性能。 8. Transient Finite Element Analysis Transient Finite Element Analysis（瞬态有限元分析）是一种数值分析方法，用于解决瞬态问题。它通过将研究区域离散成有限个元素，对每个元素进行计算，最后对结果进行组合，获得研究区域的整体结果。 9. ANSOFT在电磁场设计中的应用 ANSOFT广泛应用于电磁场设计中，例如电感器、变压器、电机等设计。它可以对电磁场进行仿真和优化，帮助用户设计高效、低损耗的电磁设备。 10. ANSOFT在热场设计中的应用 ANSOFT也广泛应用于热场设计中，例如热交换器、热管等设计。它可以对热场进行仿真和优化，帮助用户设计高效、低损耗的热交换系统。 ANSOFT是一个功能强大、应用广泛的仿真软件，广泛应用于电磁场、热场、结构场等领域。

1318 IEEE TRANSACTIONS ON MAGNETICS, VOL. 40, NO. 2, MARCH 2004

A Dynamic Core Loss Model for Soft Ferromagnetic

and Power Ferrite Materials in Transient

Finite Element Analysis

D. Lin, P. Zhou, W. N. Fu, Z. Badics, and Z. J. Cendes

Abstract—A dynamic core loss model is proposed to estimate

core loss in both soft ferromagnetic and power ferrite materials

with arbitrary flux waveforms. The required parameters are the

standard core loss coefficients that are either directly provided by

manufacturers or extracted from the loss curve associated with si-

nusoidal excitation. The model is applied to calculating core loss

in both two-dimensional and three-dimensional transient finite el-

ement analysis, and the results are compared with measured data.

Index Terms—Core loss, finite element analysis, hysteresis,

minor loop, power ferrite, soft ferromagnetic, transient.

I. INTRODUCTION

T IS STILL challenging to predict core loss under transient

conditions in the design of magnetic power devices such

as inductors, transformers, and electric machines. While ap-

proaches exist for loss computation in power devices in the fre-

quency domain, an appropriate method for core loss computa-

tion in the time domain remains unclear.

In the frequency domain, loss separation is widely used with

problems involving magnetic laminations. Loss separation

breaks the total core loss into static hysteresis loss

, classical

eddy current loss

, and excess loss [1]

(1)

Given the coefficients

, and the parameter , the total

core loss per unit volume

in the frequency domain can be

calculated in terms of peak magnetic flux density

and fre-

quency

. When this approach is applied to the time domain,

the computation of the eddy current loss and the excess loss is

straightforward. However, the computation of hysteresis loss is

still difficult.

With ferrite materials, a well-known empirical approach pro-

posed by Steinmetz a century ago is normally used

(2)

where

, and are empirical parameters obtained from

experimental measurement under sinusoidal excitation [2]. In

Manuscript received July 1, 2003.

The authors are with Ansoft Corporation, Pittsburgh, PA 15219 USA (e-mail:

dlin@ansoft.com).

Digital Object Identifier 10.1109/TMAG.2004.825025

order to estimate the power loss with nonsinusoidal excitation,

a modified Steinmetz equation (MSE) was developed [3]

(3)

where

is the equivalent frequency of the nonsinusoidal in-

duction waveform, and

is the repeated frequency. With the in-

troduction of an equivalent frequency, MSE provides a good fit

to experimental measurements under triangular magnetization

[3]. However, MSE is only suitable in the frequency domain.

Many time-domain hysteresis models have been proposed for

instantaneous loss calculation. These are mainly based on the

Jiles–Atherton model [4], [5] or the Preisach model [6]. Al-

though these models describe hysteresis phenomena quite well,

their practical use is limited by the high number of empirical pa-

rameters and/or the prohibitive experimental effort required [3].

In this paper, an alternative time domain dynamic hysteresis

model is developed for soft magnetic and power ferrite materials

based on the idea of an equivalent elliptical loop. This model is

able to consider the effects of minor loops and predicts instan-

taneous hysteresis loss with good accuracy. In addition, the re-

quired parameters in the model are the same as those required in

the frequency domain approaches (1) and (2). These parameters

are either directly available from manufacturers or can be easily

extracted from standard loss curves under sinusoidal excitation.

II. F

ORMULATIONS

A typical value of hysteresis loss parameter

in (1) is 2. In

this case, the magnetic field

in a static hysteresis loop can

be decomposed into two components: a reversible component

and an irreversible component . As a result, hysteresis

loss can be computed by

(4)

The reversible component can be directly obtained from the

normal

curve without considering a hysteresis loop. In

fact,

is related to the reactive power in the material and

is associated with the hysteresis loss. Consequently, the in-

stantaneous hysteresis loss is

(5)

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