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1.
論文 |
Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; Dawson, F.P. ; 岩原, 正吉 ; 山田, 外史
概要:
Different topological configurations for a passive magnetic current limiter consisting of a permanent magnet and saturable core are discussed in this paper. The models for a series/parallel biasing mode, and a single/three phase supply
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system have been fabricated and the experiments have been carried out for the performance evaluation. Using tableau method, the transient performance of different models has been simulated. The feasibility of applying the current limiter for the protection of power semiconductor devices in moderately low voltage applications is investigated.
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2.
論文 |
Ohji, T. ; Kano, M. ; Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; 岩原, 正吉 ; 山田, 外史
概要:
A permanent magnet bearing (MB) system utilizing the repulsive forces operating between the stator and rotor permanent magnet for levitation and radial control has been fabricated in our laboratory, The consistency of the permanent magnet
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magnetization effects the continuous steady-state and dynamic performance of the system. Since both the magnets are repelling each other, there will be demagnetization of the magnetization of the permanent magnet. Due to demagnetization or ageing or manufacturing asymmetry, the field distribution may not be uniform along the periphery of the magnet. In this paper the effect of this magnetization non-uniformity on the performances of the bearing system has been studied.
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3.
論文 |
Mukhopadhyay, S.C. ; Ohji, T. ; Yamada, Sotoshi ; 山田, 外史
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4.
論文 |
Mukhopadhyay, S.C. ; Woolley, J.D.M. ; Yamada, Sotoshi ; 山田, 外史
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5.
論文 |
Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; 岩原, 正吉 ; 山田, 外史
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6.
論文 |
Mukherjee, A. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; Mukhopadhyay, S.C.
概要:
Fast transient analysis of a passive fault current limiter (FCL) using permanent magnets can be done by direct numerical solution of a single non-linear differential equation. The non-linear B-H excursion that is caused by hysteresis
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is incorporated in the computation using a transient hysteresis model. Rational fractions are used to represent the parent hysteresis loop curves. Since the method uses preconstructed expressions as applicable to FCL schemes only, computation time required is less.
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7.
論文 |
Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; Dawson, F.P.
概要:
There is an increasing need in power system applications for fault current limiter, to limit the fault current in semiconductor devices and switchgear. These fault current limiters must be reliable, compact and inexpensive. This
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paper reports the result of an investigation of the characteristics of a Fault Current Limiter (FCL) consisting of a steel core and permanent magnet. Design criteria are presented. The FCL characteristics are simulated using a Tableau approach and the simulation results have been compared with experimental result.
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8.
論文 |
Mukhopadhyay, S.C. ; Dawson, F.P. ; Iwahara, Masayoshi ; Yamada, Sotoshi
概要:
The fabrication and development of a novel compact three phase magnetic current limiter consisting of permanent magnets (PM) and saturable cores is described in this paper. Simulation results using the tableau approach are presented for
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varying operating conditions. Experimental results are in good agreement with the simulation results. The proposed current limiter has potential in moderately low voltage applications.
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9.
論文 |
Iwahara, Masayoshi ; Mukhopadhyay, S.C. ; Yamada, Sotoshi ; Dawson, F.P.
概要:
So far the reported literature on the magnetic fault current limltcr(FCL) arc based on series biasing mode in which the flux due to Hue current flows through the permanent magnet, As a result there ta a high possibility of demagnetization
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of the permanent mngnet. A passive Cault current limiter lu a combination or passive elements such a.s permanent magnet and saturablc core. Permanent mngnet Is used to bias (he core, In order to avoid severe demagnetization of permanent magnet, in this paper we have Investigated the performances of passive fault current limiter based on permanent magnet nnd saliirablc core In parallel biasing mode, the functional characteristics have been analyzed by Tableau approach and the simulation results arc presented. The experimental results for a small scale prototype model are also presented for verification.
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10.
論文 |
Mukhopadhyay, S.C. ; Yamada, Sotoshi ; Iwahara, Masayoshi
概要:
To overcome the directional properties of a planar meander-type sensor, a new planar micromagetic sensor having mesh-type configuration is reported in this paper. Analytical models are usually used for the characterization of the
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planar-type sensors. Sensors having mesh-type configuration have been fabricated for the derivation of the optimum coil pitch.
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