Hirochika Ueyama
JTEKT
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Hirochika Ueyama.
Archive | 1993
Ryoichi Takahata; Hirochika Ueyama; Atsushi Kubo
A superconducting magnetic bearing (SMB) of bulk YBa2Cu3O7−x having strong pinning force was assembled and cooled in a field cooling state at 77K. Two SMB units were equiped with a rotational system and supported a rotating shaft weighing 2.5Kg with no mechanical contact. The SMB has achieved a rotational speed exceeding 42,000rpm with a radial runnout of 8µm or less. The rotating performance at high speed has disclosed by an active control assist in radial direction during accelerations.
Archive | 1992
Ryoichi Takahata; Hirochika Ueyama
Superconducting magnetic bearings using flux pinning forces have a stability, permanent magnet bearings have not, without any control. High-Tc superconductor YBa2Cu3OX as a stator and a permanent magnet for a rotor were assembled into a superconducting magnetic bearing. Its stiffness and vibration damping coefficient in axial direction were measured. These properties depended on an axial gap between superconductor and permanent magnet. As a flux pinning force of YBa2Cu3OX increased, bearing stiffness also increased but vibration damping coefficient decreased. The damping effect was related to the area of the hysteresis loop measured in a function of magnetic force versus axial gap.
Archive | 1999
Hironori Kameno; Yasukata Miyagawa; Ryouichi Takahata; Hirochika Ueyama
Characteristics of a superconducting magnetic bearing (SMB) for supporting a rotor was studied A designed and manufactured testing machine has following two features. (l)The rotor is levitated by five axis active magnetic bearings (AMBs: RaAMB & AxAMB) and SMB. (2)It is able to vary an initial load of SMB. As a result, levitation force decrease of SMB was measured under various load conditions and various rotation speeds.
Archive | 2000
Hirochika Ueyama; Hironori Kameno; Manabu Taniguchi
Archive | 1997
Hirochika Ueyama; Manabu Taniguchi
Archive | 1997
Manabu Taniguchi; Hirochika Ueyama
Archive | 2007
Manabu Taniguchi; Hirochika Ueyama; Yasutaka Miyagawa
Archive | 2007
Manabu Taniguchi; Yasukata Miyagawa; Hirochika Ueyama
Archive | 2005
Hirochika Ueyama; Yasukata Miyagawa
Archive | 1999
Hirochika Ueyama; Atsushi Kubo