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Your search keyword '"Niguchi, Noboru"' showing total 254 results
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254 results on '"Niguchi, Noboru"'

8. AC/DC current ratio in a current superimposition variable flux reluctance machine

Author

Kohara Akira, Hirata Katsuhiro, Niguchi Noboru, and Takahara Kazuaki

Subjects
finite element analysis, vector control, rotating machines, traction motors, 84.50.+d, Physics, QC1-999
Abstract

We have proposed a current superimposition variable flux reluctance machine for traction motors. The torque-speed characteristics of this machine can be controlled by increasing or decreasing the DC current. In this paper, we discuss an AC/DC current ratio in the current superimposition variable flux reluctance machine. The structure and control method are described, and the characteristics are computed using FEA in several AC/DC ratios.

Published
2018
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9. Dynamic characteristics of triaxial active control magnetic bearing with asymmetric structure

Author

Nakajima Atsushi, Hirata Katsuhiro, Niguchi Noboru, and Kato Masayuki

Subjects
magnetic bearings, magnetic levitation, electromagnet, finite element method, 02.30.fn, 07.20.ka, 84.71.ba, 85.70.ay, Physics, QC1-999
Abstract

Supporting forces of magnetic bearings are lower than those of mechanical bearings. In order to solve these problems, this paper proposes a new three-axis active control magnetic bearing (3-axis AMB) with an asymmetric structure where its rotor is attracted only in one axial direction due to a negative pressure of fluid. Our proposed 3-axis AMB can generate a large suspension force in one axial direction due to the asymmetric structure. The performances of our proposed 3-axis AMB are computed through 3-D finite element analysis.

Published
2018
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10. Current superimposition variable flux reluctance motor with 8 salient poles

Author

Takahara Kazuaki, Hirata Katsuhiro, Niguchi Noboru, and Kohara Akira

Subjects
variable flux reluctance motor, current superimposition, coupled analysis, 84.50.+d, 85.70.ay, Physics, QC1-999
Abstract

We propose a current superimposition variable flux reluctance motor for a traction motor of electric vehicles and hybrid electric vehicles, which consists of 10 salient poles in the rotor and 12 slots in the stator. However, iron losses of this motor in high rotation speed ranges is large because the number of salient poles is large. In this paper, we propose a current superimposition variable flux reluctance motor that consists of 8 salient poles and 12 slots. The characteristics of the 10-pole-12-slot and 8-pole-12-slot current superimposition variable flux reluctance motors are compared using finite element analysis under vector control.

Published
2017
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26. Fault-Tolerant Control for a Six-Phase Two-Controllable-Rotor Motor

Author

Suzuki, Hironori, Hirata, Katsuhiro, Niguchi, Noboru, and Takahara, Kazuaki

Abstract

A number of transport vehicles have been fitted with electric traction motors and their inverters. The traction motor is required to continue to operate even if the inverter is under fault conditions. We propose a motor with two controllable rotors for a traction motor, which consists of two rotors and one stator. In this article, we propose a fault-tolerant control method for a two-controllable-rotor motor using a six-phase inverter. The operational principle of the two-controllable-rotor motor is described. The mathematical model under fault-tolerant control is shown, and a fault-tolerant control method for the two-controllable-rotor motor is described. The proposed fault-tolerant control method is verified by conducting finite element analysis (FEA) and carrying out measurements on a prototype.

Published
2023
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