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Bessho, Kazuo ; Yamada, Sotoshi ; Kooto, M. ; Masahashi, M. ; Nakano, Masachika
概要:
This paper deals with the performance characteristics of a new ac high magnetic field generator based on the effect of eddy currents. We have proposed a new ac high magnetic field generator and have obtained magnetic fields up to 15 T at 60
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Hz. The proposed structure consists of layers of exciting coils and conductors built in concentric circles. The eddy currents in the conductor flow close to the hole in the conductor. The magnetic flux induced by the eddy currents is concentrated within the hole, and an ac high magnetic field is produced. A procedure for estimating the optimum shape and number of layers required to increase the concentration effect, together with a design of the colling system necessary for continuous operation, is presented.
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| 2.
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Yoshimoto, T ; Yamada, Sotoshi ; Bessho, Kazuo
概要:
This paper deals with the four component three dimensional FEM analysis of a flux concentration model with four thick conducting plates placed between a pair of a.c.-excited coils. We have already analyzed a flux concentration apparatus
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with two conducting plates by using a newly developed iterative 3-D calculation method.[1] [2] An improved formulation is also treated in this paper. This calculation method is applied to the present four-plate type model, to prove its adaptability and to search for more efficient design of such apparatus. Distributions of flux densities, eddy currents and scalar potentials are calculated and discussed. The role of the scalar potential for the 3-D eddy current diffusion problems is also interpreted, based on our calculation results.
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| 3.
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Lu, Junwei ; Dawson, F.P. ; Yamada, Sotoshi
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Yoshimoto, T ; Yamada, Sotoshi ; Bessho, Kazuo
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| 5.
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Bessho, Kazuo ; Yamada, Sotoshi ; Sudani, T. ; Kanamaru, Y.
概要:
Some magnetic frequency triplers using the saturation characteristics of an iron core have been reported. In this paper a new frequency tripler which is based on the bridge-connected reactor circuit is proposed. The features of this tripler
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are that an applied source is single phase and ferro-resonance circuits are formed in both the output and input side. Consequently, the circuit becomes very simple, the power factor is greatly improved and the triple frequency output voltage holds constant. This paper presents some experiments and considerations on a new tripler. Moreover, various circuits which have equivalent operating characteristics are proposed.
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| 6.
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Yamada, Sotoshi ; Takeuchi, A. ; Bessho, Kazuo
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This paper described the structure and characteristics of a new high-speed induction motor. The motor has the magnetic c
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ombination of an induction motor and a magnetic frequency tripler and is called a “hybrid motor”. When the three-phase to two-phase type tripler we proposed is adopted, this rotating-field type hybrid motor can be constructed. The motor has remarkable starting torque and operates near synchronous speed (10800rpm) by only an application of a 60 Hz commercial source. It is noted that the motor has no semiconductor device and a brushless structure.
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| 7.
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Bessho, Kazuo ; Yamada, Sotoshi ; Kooto, M. ; Hayashigishi, M. ; Furuta, M.
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The paper describes the performance and analysis of eddy-current type laminated coil for ac high magnetic field. It is difficult to obtain an ac high magnetic field by using an air-gap coil because of eddy currents. For our device, we can
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obtain an ac high magnetic field by means of the magnetic shielding effect of eddy currents. Two kinds of a new type of coil are proposed in order to construct the apparatus easily. The field distributions were analyzed by the two-dimensional finite element method.
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| 8.
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Yamada, Sotoshi ; Bessho, Kazuo ; Lu, Junwei
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The harmonic balance finite element method(HBFEM) we proposed is suited to analyzing the time-periodic magnetic field. An AC magnetic field calculation involving saturation characteristics requires many iterations and the intricate
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procedures for the time derivative. The procedure of the numerical calculation for a new FEM is intrinsically similar to that for the static nonlinear magnetic problem. The paper describes the formulation for the time-periodic magnetic field problems with any saturation characteristics. The calculations applied to a reactor and an electromagnet verifies the formulation of the HBFEM.
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| 9.
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Yoshimoto, T. ; Bessho, Kazuo ; Yamada, Sotoshi
概要:
This paper deals with three dimensional analysis of the eddy current distribution in a cylinder-type flux concentration apparatus by using a four component finite element calculation method. In order to solve z-ward component
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of eddy currents in a new model with multi-rims, boundary conditions of four components are discussed. We have already examined and analyzed several types of flux concentration apparatus, which utilize the flux concentration effect of eddy currents [1][2][3][4]. However, in these models treated in the references shown above, we do not have to consider the current component perpendicular to the excitation current. In order to obtain three dimensional flow of eddy currents, boundary conditions for four variables should-be selected carefully. Boundary conditions especially for z-ward vector potential and the scalar potential are discussed.
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| 10.
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Yamada, Sotoshi ; Takeuchi, A. ; Sudani, T. ; Bessho, Kazuo
概要:
The new electric motor is the magnetic combination of a magnetic frequency multiplier and a AC motor which share the com
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mon magnetic yoke. The motor operates near the synchronous speed (10,800 rpm) by applied the single-phase commercial source at 60 Hz. The new machine is called “high-speed hybrid AC motor” because the combination of a motor and a frequency converter. This paper describes the structure and the operating characteristics of the new motor.
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