• Title, Summary, Keyword: electromagnetic force

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A Study on the Two-dimensional Formation Control of Free Surface of Magnetic Fluid by Electromagnetic Force (전자기력에 의한 자성유체의 2차원 자유표면 형상 제어에 관한 연구)

  • Bae Hyung-Sub;Yang Taek-Joo;Lee Yuk-Hyung;Joo Dong-Woo;Park Myeong-Kwan
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.3
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    • pp.29-37
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    • 2005
  • In this study, the control of the free surface deformation of a magnetic fluid for the change in electromagnetic force is discussed. The free surface of magnetic fluid is formed by the balance of surface force, gravity, pressure difference, magnetic normal pressure and magnetic body force. Magnetic fluid in characteristics of fluid adjusted to the opposite direction of the gravity direction. Thus, the device of a magnetic fluid proposed the complete zero-leakage sealing, oscillator for surface control, boundary layer control, MHD, flow control, flow using magnetic levitation system and surface actuator. This study show the deformation of surface rise due to the intensity of the magnetic field and possibility of two-dimensional control of magnetic fluid through the feedback data of hall sensor.

A Study on the Noise and Vibration Analysis of 200kW PMSM for Electric Propulsion Ship

  • Cho, Yang-Uk;Kang, Gyu-Hong
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.4
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    • pp.389-393
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    • 2014
  • This paper presents one of the methods for design to reduce the noise and vibration of 200kW motor for electric propulsion ship. One of the important factors affecting vibration of the motor is the resonance. The natural frequency and natural mode of the 200kW motor is analyzed by using FEM tool and impact test equipment to avoid the resonance. Also, compare FEM result with impact test result to make a reliable FE model of 200kW motor. In order to find out the effect of the noise and vibration of the motor by electromagnetic excitation force, conduct electromagnetic-structure coupled analysis. These characteristics are much useful to design 200kW motor for electric propulsion ship.

An Experimental and Numerical Analysis of Flow of Electromagnetic Pump for Molted Metal Transport (용융금속 이송용 전자기 펌프의 유동해석 및 실험)

  • Choi, Jae-Ho;Lim, Hyo-Jae;Kim, Chang-Eob;Kwon, Jung-Tae
    • Proceedings of the KSME Conference
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    • pp.2621-2625
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    • 2007
  • This study aims at analyzing the flow characteristics of the electromagnetic pump using a linear induction motor (LIM) for transferring molten metals. The flow characteristics of the pump are simulated by magnetohydrodynamic(MHD) program. In this system, the LIM is used for transferring molten metal by electromagnetic force. The molten metal is treated as the secondary part of the LIM. Since the LIM produces an electromagnetic force in the duct, the molten metal can flow from the furnace to the reservoir. The flow characteristics of the pump are analyzed using MHD program for magnetic field of 0.1[T] in duct. In order to prove the analysis, we made a prototype electromagnetic pump using LIM.

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Noise Lowering for a Large Variable Speed Range Use Permanent Magnet Motor by Frequence Shift and Structural Response Evaluation of Electromagnetic Forces

  • Arata, Masanori;Takahashi, Norio;Fujita, Masafumi;Mochizuki, Motoyasu;Araki, Takashi;Hanai, Takashi
    • Journal of Power Electronics
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    • v.12 no.1
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    • pp.67-74
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    • 2012
  • According to electrical output up rating of a permanent magnet motor and request to operate for a large variable speed range, resonance between structural natural vibration and electromagnetic force inside the motor can take place and make noise. This paper describes the mechanism of a resonance between them and noise lowering procedure by frequency shift when they are applied to the reluctance torque largely employed new motor named Permanent magnet Reluctance Motor (PRM).

A Study on the Determination of Optimal Circuit Constants of Shading Coil (Shading Coil의 최적 회로정수 결정에 관한 연구)

  • 김시화
    • Journal of the Korean Institute of Navigation
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    • v.9 no.1
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    • pp.95-109
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    • 1985
  • It has been generally known that the chattering of an AC electromagnetic contactor due to the fluctuation of attracting force is the primary cause of its abrasion and noise. To reduce this chattering effect, an AC electromagnetic contactor is mostly fitted with a shading coil which works the role to make difference in phases of two distinct components of attracting force. The theoretical interpretation of an AC electromagnetic contactor with shading coil and the equation of its attracting force per unit wattage consumed have already been proposed, however, few explications so far have been made on the determination of optimal circuit constants of shading coil. In this paper, the auther constructs a circuit model of an AC electromagnetic contactor with shading coil which is based on the theoretical interpretation of shading coil examined to be valid by experiments under some assumptions, and defines the equation of attracting force without chattering per unit wattage consumed as a performance function for determining the optimal circuit constants of shading coil. And then, the optimal circuit constants maximizing the performance function are determined by means of computer simulation founded on the above circuit model and the characteristics of those circuit constants are examined with special attention to the coupling coefficient.

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Analytical and Experimental Studies on the design of Electromagnetic Shock Absorber (전자기식 충격흡수구조의 설계를 위한 동특성 해석 및 실험)

  • Yi, Mi-Seon;Bae, Jae-Sung;Hwang, Jae-Hyuk;Im, Jae-Hyuk
    • Journal of Aerospace System Engineering
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    • v.6 no.1
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    • pp.26-32
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    • 2012
  • A shock absorber with magnetic effects is suggested for a lunar space-ship expected to launch in 2025. The device consists of a copper steel combined tube, two magnets, and a piston. The piston is designed to move a magnet through the tube when it is pushed by an external impact. While the magnet is moving in the tube, it generates the eddy current force with the copper part of the tube and it also makes the large friction force with the steel part of the tube. Beside, it gets resistive forces against its movement such as the magnetic force with a steel-ring at the first time of the movement and the repulsive force with a same pole opposed magnet at the end time of the movement. In this thesis, results of analyses and experiments of each force are represented and the expected performance of the electromagnetic shock absorber is drawn from the results.

Investigation of Electromagnetic Force for Magnetic Contactor of Railway Vehicles (철도차량용 전자접촉기 전자코일의 전자기력 특성 연구)

  • Jung, Jooyoung;Park, Ji-Won;Choi, Jinnil
    • Journal of the Korean Society for Railway
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    • v.19 no.3
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    • pp.324-330
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    • 2016
  • A magnetic contactor is a switching device widely used for electric circuits. For the operation of magnetic contactors, magnetic coils are essential; these coils create and interrupt the electric circuit. In this paper, the finite element analysis model was developed to reflect the experimental data, and was verified through alteration of the applied voltages and the numbers of turns. Effects of electromagnetic force on the geometrical variations of the facing poles for fixed and moving cores of two magnet coils were investigated. In addition, effects of slope and air gap size between two facing poles on the electromagnetic force were explored through the distribution of the magnetic flux density in the magnetic coils of a push-type solenoid. Through this analysis, the characteristics of the electromagnetic force against the facing poles were explored.