• Title/Summary/Keyword: Demagnetization characteristic

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Rotor Shape Design of Line-Start Motors considering demagnetization (불가역 감자특성을 고려한 Line-Start Motor의 회전자 형상설계)

  • Kang, Gyu-Hong;Lee, Sun-Kwon;Hong, Jung-Pyo;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.834-836
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    • 2001
  • This paper deals with analysis for demagnetization characteristic of a ferrite magnet line start motor using FEM. Maximum start and clock currents are calculated by transient state voltage and dynamic equation, and then, these currents are applied to FE analysis. The characteristics of motor according to partial demagnetization are analyzed from FE analytic results, and rotor shape is designed for improvement of demagnetization characteristic.

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Design of SPOKE Type BLDC Motor for Traction Application Considering Irreversible Demagnetization of Permanent Magnet

  • Hur Jin;Kang Gyu-Hong
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.2
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    • pp.129-136
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    • 2005
  • This paper presents a design strategy of SPOKE type BLDC motors considering an irreversible demagnetization of a permanent magnet (PM). So the irreversible demagnetization characteristic of the motor is analyzed by rotor structure. The instantaneous currents in either starting or lock rotor condition, which are calculated from the current dynamic analysis, are applied to the analysis of the irreversible demagnetization field by FEM. In irreversible demagnetization analysis by FEM, the variation of residual flux density in PM is analyzed using the non-linearity of magnetic core on B-H plan. The analysis results are compared to several rotor structures and used for optimize the rotor structure.

Characteristic Analysis of IPMSM for Electric Vehicle Propulsion With Variable Operating Condition Based on Numerical Analysis (운전조건을 고려한 전기자동차 구동용 IPMSM의 수치해석 기반의 제 특성 해석)

  • Im, Chae-Young;Jung, Sang-Yong;Lee, Cheol-Gyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1502-1509
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    • 2011
  • This Paper presents characteristic analysis in terms of interior permanent magnet synchronous motor for electric vehicle propulsion using numerical analysis. Torque ripple analysis, thermal analysis, demagnetization analysis of permanent magnet and mechanical stress analysis with variable operating condition are presented. According to these characteristic analysis, both the performance of motor and possible problems during the operation are examined thoroughly in advance.

Driving Characteristic of Passive Converter for Single Phase SRM (단상 SRM 구동을 위한 Passive Converter 동작특성)

  • Liang, Jianing;Seok, Seung-Hun;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2008.04c
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    • pp.113-115
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    • 2008
  • At the high speed operation, the high demagnetization voltage can reduce the negative torque, so the output power and efficiency can be improved. In this paper, a novel power converter for single phase SRM with high demagnetization voltage is proposed. A simple passive capacitor circuit is added in the front-end, which consists of three diodes and one capacitor. Based on this passive network, the two capacitors can be connected in series and parallel, so the phase winding of SRM obtains general do-link voltage in excitation mode and the double dc-link voltage in demagnetization mode. The operation modes of the proposed converter are analyzed in detail. Some computer simulation results is done to verify the performance of proposed converter.

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Demagnetization and Iron loss Analysis of the Single-Phase Flux Reversal Machine for High Speed drives (고속 구동용 단상 자속 역전식 전동기의 감자특성 및 철손분석)

  • Kim, Yong-Su;Kwon, Sam-Young;Lee, Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.1
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    • pp.100-110
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    • 2006
  • This paper presents the demagnetization and iron loss analysis of the single phase Flux Reversal Machine. It has a magnetic configuration similar to the switched reluctance machine but with multipole permanent magnets of alternate polarity on each stator salient pole embraced by concentrated coils. But it can be demagnetized by sudden over current and core losses increase because switching frequency is getting faster. This paper show demagnetization of permanent magnet and iron loss characteristic, and proposed a solution.

Design of SR Drive Using Passive Converter for Hydraulic Pump System (패시브 컨버터를 적용한 유압유니트용 SRM 제어기 설계)

  • Seok, Seung-Hun;Liang, Jianing;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.863_864
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    • 2009
  • Design and drive characteristics of SR drive for hydraulic pump system using passive converter is presented in this paper. In oder to get the high performance, a simple passive circuit is added in the front-end of a conventional asymmetric converter, which consists of three diodes and one capacitor. This passive converter has the high demagnetization voltage, to reduce the demagnetization time. Futhermore optimal turn-off angle for the proposed passive converter is proposed. According to motor speed and current, an optimal turn-off angle can be achieved by look-up table to reduce torque ripple. The characteristic of proposed hydraulic pump system using passive converter is verified by simulation and experimental results.

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High Temperature Demagnetization Characteristic Analysis of High-Speed Machine with Diametrically Magnetized Permanent Magnet Rotor (직경방향 자화된 영구자석 회전자를 갖는 초고속 전동기의 고온 감자 특성 해석)

  • Jang, Seok-Myeong;Cho, Han-Wook;Kwon, Jung-Ki;Park, Ji-Hoon;Lee, Sung-Ho
    • Proceedings of the KIEE Conference
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    • 2004.04a
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    • pp.74-76
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    • 2004
  • This paper deals with the analytical method to calculate the high temperature demagnetization characteristics of a high-speed machine with diametrically magnetized permanent magnet rotor. The equivalent magnetic circuit model is used to analyze the magnet operating point on high temperature condition. Agreements have been obtained between the results of the analytical model and finite-element analysis on prototype high-speed motors.

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Harmonic Iron Loss Analysis of Permanent Magnet Motor for High-Speed Train (고속 전철 견인용 영구자석 전동기의 고조파 철손해석)

  • Seo, Jang-Ho;Chung, Tae-Kyung;Jung, Sang-Yong;Lee, Cheol-Gyun;Jung, Hyun-Kyo
    • Journal of the Korean Society for Railway
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    • v.12 no.3
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    • pp.335-341
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    • 2009
  • To predict efficiency of interior permanent magnet synchronous motor (IPMSM) for traction motor and to cope with the risk of demagnetization in the permanent magnets, accurate iron loss analysis and understanding of the characteristic of the iron loss are very important at motor design stage. In this paper, we present the method to estimate the iron loss for the IPMSM considering the driving conditions such as both field weakening control and maximum torque per ampere control.

Paleomagnetic Study of the Yeonil Group in Pohang Basin (포항분지(浦港盆地)에 분포(分布)하는 연일층군(延日層群)의 고지자기(古地磁氣) 연구(硏究))

  • Kim, Kwang Ho;Doh, Seong-Jae;Hwang, Chang-Soo;Lim, Dong Seong
    • Economic and Environmental Geology
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    • v.26 no.4
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    • pp.507-518
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    • 1993
  • Paleomagnetic investigations have been carried out on the Tertiary sedimentary formations (Yeonil Group) in Pohang basin, southeastern Korea. A total of 215 samples were collected from 26 sites. Progressive thermal demagnetization indicates that many samples have unstable magnetization and do not reveal a characteristic direction. However, some samples from the lower and upper Duho Formation show a characteristic direction $D/I=7.8^{\circ}/48.3^{\circ}$ (${\alpha}_{95}=3.7^{\circ}$, k=174.1). Stepwise thermal demagnetization data show that some samples from the Hagjeon and middle Duho Formations reveal great-circle distributions moving from the present to a reversed direction of geomagnetic field. The mean of intersection points of the great-circles is nearly antipodal to the characteristic normal direction of the lower and upper Duho Formation. We infer that the Hagjeon Formation was formed during the reversed polarity chron C5B (16.2~14.7 Ma) and the Duho Formation 14.7~11.6 Ma based on our results and previous paleontologic and age dating data. Paleomagnetic direction for the Middle Miocene of Korea, analysed from the combined results of stable endpoints and great circles, is $D/I=8.7^{\circ}/53.9^{\circ}$ (${\alpha}_{95}=4.2^{\circ}$, k=74.8), and the corresponding paleopole is Lat./Long.=$82.7^{\circ}/230.2^{\circ}$ (${\delta}p=2.8^{\circ}$, ${\delta}m=5.9^{\circ}$). On the basis of this, we interpret that the opening of the East sea (Japan sea) or the synchronous clockwise rotation of the Southwest Japan exerted no structural influence on the Yeonil Group in the Middle Miocene.

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Characteristic Analysis and Demagnetization Current Determination of Variable Flux Memory Motor for variable Speed Control (속도 제어용 가변자속 메모리 모터의 특성 연구 및 감자전류 산정)

  • Kim, Young-Hyun;Lee, Jung-Ho
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.890-891
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    • 2015
  • 본 논문에서는 속도 제어를 위한 가변자속 메모리 모터(Variable Flux Memory Motor)의 특성과 감자전류 산정에 대하여 다루었다. 서론에서는 VFMM에 대한 특징 및 설계를 위한 분석 방안을 제시하였으며, 메모리모터의 동작 원리와, 정밀한 해석 방법은 본론을 통하여 자세히 다루었다. 감자전류는 프라이자흐 모델을 이용하여 초기 자석의 자화량을 비선형 적으로 구한 후 인가된 d축 전류에 따른 변화된 자화량 및 기전력 값들을 반복적인 연산을 통하여 신뢰성 있는 감자전류를 산정하였다.

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