• Journal of Industrial Technology
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• v.29 no.A
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• pp.177-182
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• 2009

The inductor which is used at low frequency as the main part of magnetic ballast consists of an iron core, a bobbin and coil. The conventional inductor design method is not suitable for the magnetic ballast because it has various variables and is not a unique method for the magnetic ballast. Thus, this paper presents the optimal design method for a lamination type inductor using a magnetic ballast for Metal Halide Lamps. Also, the optimal inductor design method is researched for inductors of dimming ballasts and ignitors that have a gate-triggered structure using a SCR thyristor. By the simulation and experimental results, we showed that the proposed design methods is valid.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.272-274
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• 1998

This paper treated the design and performance test of high speed motor/generator used in the flywheel energy storage system. The unique characteristics of the motor in this paper is the it doesn't contain any magnetic material. The field system was constructed by using Halbach array that generates the magnetic field with the permanent magnet only. The armature was also composed of plastic bobbin and winding. This paper shows the design results have a good agreement with the experimental results.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.256-258
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• 1999

The quench characteristics of cable consisted of superconducting strand for Tokamak system are observed and analyzed. The superconducting strands chrome-plated are twisted into cable. This cable was wound on bobbin and quench test is carried out by pulse source. At about 2500A the cable quenched.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.230-233
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• 2003

This paper deals with the fabrication of high temperature superconducting(HTS) solenoid for DC reactor of 6.6㎸/200A inductive superconducting fault current limiter(SFCL). The winding machine which is suitable to wind HTS wire was manufactured. The proper inductance was calculated by circuit simulation and G10-FRP bobbin was fabricated with this inductance, HTS solenoid was wound by using the winding machine. The V-I characteristic of completed DC reactor in sub-cooled nitrogen(65K) was measured. The full quench current of this magnet is about 490A.

• Journal of international Conference on Electrical Machines and Systems
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• v.2 no.2
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• pp.239-245
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• 2013

Modern electric controlled valves are demanded that its solenoid actuator should be smaller size, lighter weight, lower consumption power, and higher response time. For achieving these purposes, the major design factors of solenoid actuator such as magnetic flux density, coil turn numbers, plunger size, bobbin dimension, and etc. are must be optimized. In this study, for optimal design of high speed solenoid actuator for hydraulic servo valve operation, we draw up governing equations which are composed by combination of electromagnetic theories and empirical knowledge, and deduct the values of major design factors by use of them. For more increase the operating speed, voice coil are used as main armature in manufacturing of prototype actuator. And, we have proven the propriety of the governing equations and speed increasing method by experiments using the hydraulic valve assembly adopted the prototype of solenoid actuator.

• 연구논문집
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• s.31
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• pp.101-112
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• 2001

A Twisting machine is to twist yarns for improving yarn stiffness. After twisting yarns, the twisting machine is winding yarn at a bobbin. Traverse cam is main part of winding yarn part. In other to improve twisting machine performance and stability, improve traverse cam part. Original displacement curves of traverse cam has two problems. One is that displacement curve has a vertex point the other is that velocity curve is discontinue point. So that, in this paper proposes a modified displacement curves of traverse cam and new shape design method of the traverse cam using the relative velocity method[1]. The relative velocity method calculates the relative velocity of the follower versus the cam at a center of roller, and then determines a contact point by using the geometric relationship and the kinematical constraints. Finally, we present to compare two designed cam. One is designed using original displacement curves the other is using modified displacement curve.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.383-384
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• 2012

하나의 보빈에 모든 권선을 하는 기존의 방법과 달리, 제안하는 LED TV용 변압기 구조는 여러 보빈에 권선을 나눠서 하는 방식이다. 이로 인하여 일, 이차 사이에 절연 목적으로 사용하던 절연 테이프를 모두 제거함으로써 권선 자동화를 이룰 수 있도록 한다. 제안하는 변압기 구조를 바탕으로 LLC 공진형 변압기를 설계 및 제작하여, 실험을 진행하고 변압기 설계 기술에 대하여 검증한다.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.7
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• pp.124-129
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• 2004

Recently, the demand for the optical cable is rapidly growing because the number of internee user increases and high speed internet data transmission is required. But the present optical cable winding systems has some serious problems such as pile-up and collapse of cable usually near the flange of the bobbin in the process of the cable winding. To reduce the pile-up collapse in a cable winding systems, a new guiding system is developed for a high-speed self-align cable winding. First of all, the winding mechanism was analyzed and synchronization logics for the motions of winding, traversing, and the guiding were created. A prototype cable winding systems was manufactured to validate the new guiding system and the suggested logic. Experiment results showed that the winding system with the developed guiding system outperformed the system without the guiding system in reducing pile-up and collapse in the high-speed winding.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.750-755
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• 2005

This paper proposes a small VCM (Voice coil motor) type actuator using curved suspensions for auto-focusing and zoom motions for mobile information devices. 1'he proposed focusing actuator adopts a nontraditional type of suspension using curved beams in order to extend output displacement within small height restriction. The curved beam is similar to the leaf spring type which is usually used in optical disk drives. In addition, three different materials are considered for the curved suspension model, and Aluminum shows the best dynamic characteristics. The proposed zoom actuator does not use a suspension supporting bobbin but a moving rail and a sloper mechanism by generating rotational force at lens holder. The sensitivity of design parameters on output performance is studied using ANSYS (3D FEM tool). Experiments using a prototype of the proposed actuator model verified the analytical prediction and performance.

• Journal of Sensor Science and Technology
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• v.28 no.4
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• pp.246-250
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• 2019

In this study, in conjunction with a SIMULINK program based on system modeling of a voice-coil-actuator (VCA)-driven balancing scale, a proportional-integral-derivative control algorithm is implemented, and weighing characteristics are investigated through experiments and simulations. The extent to which the back electromotive force induced in the VCA-driven circuit and the magnetic damping induced by the coil wound bobbin of VCA affect the weighing speed is also investigated.