Ferrite Orthogonal Core Research Articles

The Modeling and Simulation of Ferrite Orthogonal Core Controllable Reactor Based on Matlab

The principle and structure of ferrite orthogonal core controllable reactor(FOC-CR) were discussed. The analysis of FOC-CR's magnetic equivalent circuit and basic equations was presented. Based on these, this paper establishes the relationship of FOC-CR's input voltage and flux through a odd polynomial assumption of MMF-Flux and gives a simulation model of FOC-CR in Matlab by using S-function.The modeling method is accessed from the result of both current wave and control characteristics of simulation model and experimental prototype.

高周波フェライト直交磁心の鉄損及び温度上昇算定に関する一考察

An orthogonal core is a magnetic device which can continuously control the inductance of the secondary winding with the primary dc current. Recently orthogonal core variable inductors have been used in the high-frequency region. Analysis of this device for high-frequency applications is therefore necessary. We previously proposed an analysis method based on reluctance network analysis (RNA) for the silicon steel orthogonal core used in the commercial frequency region. In order to use the orthogonal core in a high-frequency region, we must consider the increase in the core temperature due to iron loss. In this paper, we calculate the iron loss of a ferrite orthogonal core variable inductor in the high-frequency region, based on RNA, and we estimate the core temperature on the basis of the thermal equivalent circuit.

Analysis of ferrite orthogonal core for high‐frequency region based on three‐dimensional nonlinear magnetic circuit

AbstractThis paper presents an operating analysis of a ferrite orthogonal core for high‐frequency power control and power conversion. The analysis is based on the three‐dimensional nonlinear magnetic circuit of the orthogonal core, and is called Reluctance Network Analysis. The magnetization characteristics of the ferrite orthogonal core are calculated accurately by using Reluctance Network Analysis. On the basis of the obtained magnetization curves, we can analyze the operating characteristics of the various application circuits of the orthogonal core. For an example, the control characteristics of a high‐frequency variable inductor using the ferrite orthogonal core are calculated in this paper. © 2001 Scripta Technica, Electr Eng Jpn, 137(4): 10–17, 2001

三次元非線形磁気回路に基づく高周波用フェライト直交磁心の解析

This paper presents an operating analysis of a ferrite orthogonal core for high-frequency power control and power conversion. The analysis is based on the three-dimensional nonlinear magnetic circuit of the orthogonal core, and is called Reluctance Network Analysis. The magnetization characteristics of the ferrite orthogonal core are calculated accurately by using Reluctance Network Analysis. On the basis of the obtained magnetization curves, we can analyze the operating characteristics of the various application circuits of the orthogonal core. For an example, the control characteristics of a high-frequency variable inductor using the ferrite orthogonal core are calculated in this paper. © 2001 Scripta Technica, Electr Eng Jpn, 137(4): 10–17, 2001

Performance Evaluation of Flux Control Characteristic and Shape Effect of Ferrite Orthogonal Core.

Because of its complicated flux behavior, shape effect of a ferrite orthogonal core (FOC) has not been made clear satisfactorily.In this paper, a shape effect of flux control characteristic by flux components for an FOC is presented. The flux control characteristics of component method, ratio of virtual flux-path-length, sectional area of body, ratio of permeance and thickness of common part are examined. Performance evaluation of flux control is examined between flux control sensitivity and flux control.The results, which are given by evaluation amount of flux control sensitivity and flux control ratio, show that the most respectable FOC has no thickness in common part, small amount of body and leg sectional area ratio, and the monoblock construction between the primary and the secondary side.

Relation between Material and Flux Control Characteristic of Ferrite Orthogonal Core.

In this paper, the relationship between material and the flux control characteristic of a ferrite orthogonal core (FOC) as a measurement and control element, is presented.Five types of materials are examined to know the difference between their flux control characteristics. Results show that the material which has higher amount of saturation flux density can make its flux control amount bigger.It is clear that the higher rectangular factor material has the larger amount of flux control. Furthermore, the material which has low loss but high saturation flux density shows good linear flux control characteristic. FOC which has good rectangular factor and high flux sensitibity is useful for measurement control element, especially for the on-off activity.

制御側回路条件を考慮した磁気立体回路素子の磁束制御特性の解析

制御側回路条件を考慮した磁気立体回路素子の磁束制御特性の解析

一次側磁束と二次側磁束に位相差を有する場合の磁気立体回路素子の磁束制御特性

一次側磁束と二次側磁束に位相差を有する場合の磁気立体回路素子の磁束制御特性

Flux control model of a ferrite orthogonal core

A mathematical model for a ferrite orthogonal core is developed. This model is valid under forced and unforced magnetized conditions. Control-related parameters such as flux control limits, flux control modulus, and flux control sensitivity are obtained in the process. The analytical results are verified experimentally.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Research on correlation between flux distribution and flux control characteristics of ferrite orthogonal core

This paper considers the flux distribution in ferrite orthogonal cores. To understand the operation of an FOC, the flux distribution must be known. We classify the flux components into four parts according to the flux pattern by using a flux distribution diagram. The flux control characteristics can be obtained by considering the component fluxes. The result of the analysis is a better understanding of the role of the component fluxes in improving the performance of the flux control characteristics.

Difference of flux control between two‐dimensional orthogonal core and three‐dimensional orthogonal core

AbstractThis paper points out that when the primary and the secondary sides of the ferte orthogonal core, which is one of the three‐dimensional orthogonal cores, are modified, it can be regarded as a two‐dimensional orthogonal core. It is shown also that because of its shape, this type of core has the same flux control as the original ferrite orthogonal core. However, there is a difference in the flux control mechanism in the primary and the secondary sides due to the difference of orthogonal dimensions. Based on the results of investigations, the flux control and ac (alternate current) magnetization characteristics are measured for the ferrite orthogonal core and the two‐dimensional orthogonal core. By comparing their characteristics, the flux control and other performances are demonstrated.

Research on correlation between flux distribution and flux control characteristics of ferrite orthogonal core.

This paper deals with the flux distribution in Ferrite Orthogonal Cores. The Flux distribution must be known to understand the operation of an FOC. We classify the components of flux into four parts according to the flux pattern by using a diagram of flux distribution.The flux control characteristics can be obtained by considering the component fluxes.The result of the analysis is a better understanding of the roll of the component fluxes in improving the performance of the flux control characteristics.

Control characteristic analysis of a ferrite orthogonal core

A graphical analysis to obtain the relationship between magnetic flux control and current control for a ferrite orthogonal core (FOC) is presented. The behavior of an FOC is considered as a function of three parameters, namely the primary magnetomotive force (control side), the secondary magnetomotive force, and the secondary flux. It is shown that the flux control and the current control characteristics can be obtained by considering the AC magnetization characteristic. It is also shown that the main control characteristic can easily be derived by graphical analysis.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Flux control and flux distribution in a ferrite orthogonal core

A graphical method is presented for obtaining the flux distribution in a ferrite core. This method can be applied to other types of orthogonal cores and can assist in quantitative analyses. The flux distributions are assigned to four classes on the basis of the flux pattern. The method of flux control and the resultant flux distribution in a ferrite orthogonal core are shown. It is demonstrated that the flux control characteristics can be analyzed by considering component fluxes.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Fundamental Behavior of Ternary Pulse Output Type FOC

The magnetization curve of a Ferrite Orthogonal Core (FOC) with excellent squareness ratio when the flux is controlled was studied for a new A/D conversion function. It was demonstrated that the FOC output voltage could be processed as a ternary digital output, and plotting the relation between the period intervals of two pulses of the same polarity, of a positive and a negative pulse, and the control magnetomotive force showed that phase control of the pulses is possible.

Flux control characteristics of ferrite orthogonal core using magnetic fluid

AbstractBecause of its orthogonal flux control system, the ferrite orthogonal core holds promise as a vector sensor. The combination of such a core and a magnetic fluid is of interest for control of flux with a simple system.The results of experimental studies comparing vertical and tilted ferrite orthogonal cores in magnetic fluid indicate that the system can be used as a two‐dimensional inclinosensor.

Materials of Orthogonal Core

The relations between the properties of materials used in orthogonal cores and the core performance were studied. The magnetic flux control, ambient temperature, core temperature increase and waveform distortion characteristics are presented for an amorphous orthogonal core (AOC) and an Mn-Zn ferrite orthogonal core (FOC). It is concluaded that the orthogonal magnetic flux in orthogonal cores made of layered amorphous or metal film acts to greatly increase the relucetance, so that the original properties of the material used in the core do not appear, the permeability of the laminated core becomes smaller, and magnetization characteristics are linear.

New FM tachotelemeter using ferrite orthogonal cores

A new FM tachotelemeter is presented as a suitable application of a small ferrite orthogonal core. The device is constructed from a combination of small ferrite orthogonal cores and permanent magnets.It can measure the rotation speed and the bend of the shaft simultaneously without making contact, and also the rotation speed, from rest to high-speed, continuously. The purpose of the paper is to present a configuration of the newly developed device and its operating characteristics.

Measurements of Flux Distribution in Ferrite Orthogonal Core

Measurements of Flux Distribution in Ferrite Orthogonal Core