Title: A study on dynamic characteristics and the power generation characteristics of the magnetically levitated hydraulic generator

Authors: Nobuyuki Kurita; Takeo Ishikawa; Ken-ichi Daikai; Keisuke Ohshio

Addresses: Department of Electronic Engineering, Gunma University, Tenjin, Kiryu, Gunma 376-8515, Japan ' Department of Electronic Engineering, Gunma University, Tenjin, Kiryu, Gunma 376-8515, Japan ' Department of Electronic Engineering, Gunma University, Tenjin, Kiryu, Gunma 376-8515, Japan ' Department of Electronic Engineering, Gunma University, Tenjin, Kiryu, Gunma 376-8515, Japan

Abstract: In order to develop high-efficiency and small-sized hydrodynamic generators, a novel permanent magnet biased magnetic bearing which has a three-dimensional flux path was designed and fabricated. The magnetic bearing is small but has a strong bearing capacity. This paper clarifies the operation principle and dynamic characteristics of the fabricated magnetic bearing. The fabricated magnetic bearing showed good control performance in both the time and frequency domains. In addition, the rotor rotated stably up to 10,000 min−1. Moreover, rotational loss of the magnetic bearing was about one-fifth compared with a conventional mechanical ball bearing.

Keywords: hydrodynamic generators; magnetic bearings; power generation characteristics; magnetic levitation; permanent magnet; rotational loss; control performance.

DOI: 10.1504/IJAMECHS.2013.057442

International Journal of Advanced Mechatronic Systems, 2013 Vol.5 No.3, pp.193 - 201

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 31 Oct 2013 *

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