• Journal of Korea Society of Industrial Information Systems
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• v.28 no.2
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• pp.21-30
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• 2023

As the adoption and high-performance enhancement of Electric Vehicles continue, the demand for high-output motors and high-capacity Magnetizer for producing large-scale IPMSM is increasing. The maximum peak current of the magnetization and the capacitor discharge time, which are important factors in the magnetization process, are determined by the circuit constants of the magnetizer. In this paper, we analyze the magnetizing system using MATLAB SIMULINK to design the circuit constant of the magnetizing yoke for magnetizing design and present the design procedure for Design the circuit constant. As a result, the parameters of the magnetizing yoke were derived to be 0.015[ohm] and 0.035[mH] based on the capacitance of 15,000[uF] and voltage of 5,000[V].

• Journal of the Korean Magnetics Society
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• v.2 no.2
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• pp.145-149
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• 1992

The characteristics of electromagnetic devices with permanent magnet depends greatly on the remanence pattern of permanent magnet. So, it is necessary to analyze the pattern of remanence in permanent magnet. This paper presents a finite element analysis of magnetizer considering the nonlinearity and anisotropy of yoke and magnet in magnetizer. The distributions of magnetizations are obtained according to the variations of magnetizing currents for two kinds of magnetizers with different magnetizing poles. It is found that the excessive magnetizing current results in the reduction and polarity reversion of magnetization in the multi-pole magnetizing system where the pole angle is too small. During the design and analyzing of multi-pole magnetizer, it must be considered that there exists an optimal value of magnetizing current and pole angle of magnetizer.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.860-861
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• 2015

본 논문에서는 대용량 착자요크의 설계과정에서 최대입력 전류의 크기를 산정하기 위하여 해석적인 방법을 이용하여 산정하였다. 착자요크의 등가회로로부터 회로방정식을 도출하고 2차 미분방정식으로 표현하여 입력전류를 산정하였다. 산정된 입력전류는 회로해석 툴 및 유한요소해석을 이용한 상용소프트웨어와 비교하여 해석방법의 타당성을 검증하였다.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.43 no.3
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• pp.381-387
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• 1994

In this paper, we found the improved SPICE heat transfer modeling of impulsed magnetizing fixture system and investigated temperature characteristics using the proposed model. As the detailed thermal characteristics of magnetizing fixture can be obtained, the efficient design of the impulsed magnetizing fixture which produce desired magnet will be possible using our heat transfer modeling. The knowledge of the temperature of the magnetizing fixture is very important of forecast the characteristics of the magnetizing fixture which produce desired magnet will be possible using our heat transfer modeling. The knowledge of the temperature of the magnetizing fixture is very important to forecast the characteristics of the magnetizing circuits under different conditions. The capacitor voltage was not raised above 810[V] to protect the magnetizing fixture from excessive heating. The purpose of this work is to compute the temperature increasing for different magnetizing conditions. The method uses multi-lumped model with equivalent thermal resistance and thermal capacitance. The reliable results are obtained by using iron core fixture (stator magnet of air cleaner DC motor) coupled to a low-voltage magnetizer(charging voltage : 1000[V], capacitor : 3825[$\mu$F]. The modeling and experimental results are in close aggrement.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.11 no.4
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• pp.66-73
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• 1997

A capacitor discharge impulse magnetizer using semiconductor switching device is used to produce a high current impulse of short duration in a magnetizing fixture for magnets of the various shapes. The price of today's magnetizer is relatively expensive. This paper described a method for cost estimation of capacitor discharge impulse magnetizer using semiconductor switching device and the economical efficiency analysis. We used a cost structure consisted of five major subsystems. Especially, we estimated the potential for a cost reductions in impulse magnetizer as a function of time using the learning curve, and the potentials of cost by depreciation. The reliable results were obtained by using iron-core fixture coupled to a middle-voltage magnetizer.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.43 no.2
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• pp.206-215
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• 1994

A method for simulating general characteristics and temperature characteristics of discharging SCR of the capacitor discharge impulse magnetizer-magnetizing fixture system using SPICE is presented. This method has been developed which can aid the design, understanding and inexpensive, time-saving of magnetizing circuit. As the detailed characteristic of magnetizing circuit can be obtained, the efficient design of the magntizing circuit which produce desired magnet will be possible using our SPICE modeling. Especially, computation of the temperature rise of discharging SCR is very important since it gives some indication of thermal characteristic of discharging circuit. It is implemented on a 486 personal computer, and the modeling results are checked against experimental measures. The experimental results have been achived using 305[V] and 607[V] charging voltage, low-energy capacitor discharge impulse magnetizer-magnetizing fixture of air cleaner DC motor.

• The Transactions of the Korean Institute of Power Electronics
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• v.2 no.2
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• pp.1-7
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• 1997

커패시터 방전회로의 제작 및 시험을 위해서는 고가의 비용과 위험요소가 내재되어 있으며 특히 고전력 응용을 위해서는 이러한 요소는 더욱 커지게 된다. 그 대체방법으로는 컴퓨터를 이용하여 이 회로의 동작을 모델링하고 시뮬레이션하는 것이다. 본 연구에서는 커패시터 방전 임펄스 착자가 착아 요크 시스템을 위한 SPICE 모델을 개발하고 시뮬레이션 결과를 실제 시스템의 측정치와 비교하였다. 또한 착자기 시스템의 방전회로를 위한 온도산정방법을 제안하였다. 특히 임펄스 착자기의 방전회로의 온도산정은 착자회로 설계의 중요한 지침이 되므로 극히 중요하다. 본 연구에 이용된 착자기는 저손실 유입 커패시터이며, 최대 1200[V]의 충전이 가능하다. 이러한 착자 모델의 개발을 통하여 고임펄스 방전 회로의 설계 및 개발에 소요되는 시간 및 비용을 절약하는데 크게 기여할 것이다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.828-829
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• 2008

This paper proposes a new pole shaped magnetizing fixture with a non uniform air gap for sinusoidal magnetizing a ring type permanent magnet (PM) to reduce the cogging torque. To obtain more sinusoidal distributed magnetic flux density, the magnetizing fixture's pole shape is optimized by using the sequential response surface method (RSM). And the effects of each design parameter were investigated using the magnetic analysis combined a time stepping finite element method (FEM) with Preisach model. It has been shown, through numerical analysis the optimized modelgives near sinusoidal distributed air gap flux density and drastically reduced cogging torque.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.1098-1100
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• 1993

In this paper, We found the thermal characterstic of impulsed magnetizing fixture system through the SPICE modeling and investigated the applied possibility in application aspects. As the detailed thermal characteristic of magnetizing fixure can be obtained, the efficient design of the magnetizing fixture which produce desired magnet will be possible using our thermal modeling. The purpose of this work is to compute the temperature increasing for different magnetizing conditions. The method uses multi-lumped model with equivalent thermal resistance and thermal capacitance. The model ing and experimental results are in close agreement.

• Proceedings of the KIEE Conference
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• 1993.11a
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• pp.82-84
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• 1993

A method for simulating general characteristics and temperature characteristics of magnetizing fixture coil of the capacitor discharge impulse magnetizer-magnetizing fixture system using SPICE is presented. This method has been developed which can aid the design, understanding and inexpensive, time-saving of magnetizing circuit. As the detailed characteristics of magnetizing circuit can be obtained, the efficient design of the magnetizing circuit which produce desired magnet will be possible using our SPICE modeling. Especially, The knowledge of the temperature of the magnetizing fixture is very important to forecast the characteristics of the magnetizing circuits tinder different conditions. The capacitor voltage was not raised above 810[V] to protect the magnetizing fixture from excessive heating. The temperature estimation method uses multi-lumped model with equivalent thermal resistance and thermal capacitance.