• The KSFM Journal of Fluid Machinery
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• v.6 no.4 s.21
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• pp.45-49
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• 2003

This work focuses on eliminating tiny particles from the coolant in a nuclear pipe line by using a permanent magnet on the exterior surface of the pipe. This method have some merits compared with the currently applied methods and is expected to be applied to most of the pipe lines in the nuclear plant. For instance in this method, a ring is attacked to the exterior surface of the pipe, so that it does not affect the inflows directly. Further, the cost needed in the initial build-up of the facility is low.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.163-165
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• 2002

High-speed permanent magnet machines are currently being developed for a number of applocations including gas-turbine generator sets and machine tools. Due to the high peripheral speed of the rotor and the relatively high conductively of the magnets used, rotor eddy current loss can be substantial. On the basis of analytical and finite element method, this paper deals with an analytical method for calculating eddy current losses in the rotor with permanent magnet and retaining ring.

• Proceedings of the KIEE Conference
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• 1997.07a
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• pp.9-11
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• 1997

This paper deals with the characteristic analysis of a brushless permanent magnet d.c. motor. The rotor has ring-type permanent magnet magnetized by a capacitor discharge magnetizer with multi-pole fixture. Torque and current characteristics are analyzed by the time-stepped finite element method. And then the results are compared with experimental values.

• Proceedings of the KIEE Conference
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• 1997.07a
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• pp.159-161
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• 1997

This paper presents a method of reducing cogging torque and improving average torque by changing the dead zone angle of trapezoidal magnetization distribution of rotor magnet in ring type. Because brushless d.c. motor has 3D shape of overhang, 3D analysis should be used for computation of its magnet field. In this paper, Three Dimensional Equivalent Magnetic Circuit Network method (3DEMCN) which can calculate an accurate 3D magnetic field has been introduced. The method has an advantage that nonlinear magnetic phenomena can be considered and the cogging torque analyses requesting the rotation of the rotor can be performed by the variation of magnetization distribution without remesh.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.421-422
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• 2017

The kicker modulator was upgraded and installed in 1995. The PLS-II injection kicker modulator is configured with series resonant circuit. A total of four kicker magnets are used to distribute the normal storage ring beam orbit toward the septum magnet wall. Only one kicker modulator is used to drive the four kicker magnets. It is not adjust the current magnitude and timing of magnets. During the kicking, the beam has oscillation of 2 mm horizontal direction and $200{\mu}m$ vertical direction in present injector system. Our goals is to decrease the oscillation less than $300{\mu}m$. To give balanced current for all four magnets and to have precise timing between magnet current, we have plan to divide kicker power supply into four individual power supply. In this paper, the design of new individual kicker power supply and Fabrication of the new injector system is presented.

• Proceedings of the KIEE Conference
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• 1998.11a
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• pp.40-42
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• 1998

Magnetization distribution in the ring magnet for BLDC motor is generally nonuniform because the structure of mutipole magnetizer is not symmetry and the air gap is not uniform. In this paper, the effect of the nonuniform magnetization on characteristics of the motor such as torque ripple, unbalanced force and current is examined. Time stepped finite element method is used for electromagnetic field analysis.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.18-20
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• 1995

This paper describes a 7.5T magnetic flux density superconducting wiggler that minimize net angular deflection and displacement of an electron rotating along the orbit at storage ring in Pohang Light Source. It consist of dipole superconducting magnet,high uniformity flux distribution due to current source supply,cryostat,vacuum chamber,measurement system. In this paper magnet design procedure, manufacturing, experimental results are contained.

• Proceedings of the Korean Magnestics Society Conference
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• 2014.05a
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• pp.35-35
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• 2014

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.366-368
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• 2007

Mr. Hur has developed the 7500KW permanent magnet synchronous generator. The 7500KW generator has dual blade system with vertical axis type generation module. The 7500KW generator will generating that it is too expensive and construction payment. The advantages of dual blade system are cheap in generation with better efficiency, and safety compact structure. But also this system has the expensive slide ring for to distribute electrical power.

• Proceedings of the Korean Magnestics Society Conference
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• 2013.12a
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• pp.46-47
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• 2013