公开(公告)号：US11525477B2

公开(公告)日：2022-12-13

申请号：US16714794

申请日：2019-12-16

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yong Bok Lee ,  Wonil Kwak ,  Bok Seong Choe ,  Jungwan Kim

IPC: F16C19/52 ,  F16C27/04 ,  F16C35/077 ,  G01M13/045

Abstract: Provided is a fractal structure for power-generation of bearing rotating vibration that is installed on an outer ring of a bearing to generate power using vibration generated from a micro whirling motion of the bearing, the fractal structure including a housing which is in contact with the outer ring of the bearing to receive the vibration generated from the micro whirling motion of the bearing, and has a receiving space therein, a flexible element which is disposed in the receiving space while being in contact with an inner circumference of the housing to convert the vibration into a radial direction, and a piezoelectric element which is installed between the housing and the flexible element and disposed near the receiving space, and deforms upon receiving the vibration converted in the radial direction from the flexible element, thereby producing electricity.

公开(公告)号：US11241738B2

公开(公告)日：2022-02-08

申请号：US16421687

申请日：2019-05-24

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yong Bok Lee ,  Jungwan Kim ,  Sena Jeong ,  Bok Seong Choe ,  Wonil Kwak ,  Jaeseung Byun

IPC: B22F9/10 ,  B22F9/08 ,  B33Y10/00 ,  B33Y30/00 ,  B01J2/12

Abstract: A metal powder manufacturing apparatus for a metal 3-dimensional (3D) printer includes a driving unit which generates a rotational force, a metal beam connected to the driving unit to receive the rotational force from the driving unit and having one end disposed in a vacuum chamber, and a shaft support which supports an outer circumference of the metal beam using a magnetic force for relative movement of the metal beam in a lengthwise direction of the metal beam, wherein the shaft support is disposed such that an inner side is spaced apart a predetermined distance from the outer circumference of the metal beam, and can support the metal beam at an adjusted relative distance from the metal beam.

公开(公告)号：US11905993B2

公开(公告)日：2024-02-20

申请号：US17956246

申请日：2022-09-29

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yong Bok Lee ,  Jungwan Kim ,  Yunseok Ha ,  Byul An ,  Wonil Kwak ,  Yeong-do Lee

IPC: F16C32/04

CPC classification number: F16C32/0442 ,  F16C32/0478 ,  F16C2360/45

Abstract: A turbomachine according to an embodiment of the present disclosure may include a rotary shaft, a magnetic bearing including a core body configured to surround the rotary shaft, a plurality of poles radially extending from an inner surface of the core body toward the rotary shaft, and coils wound around the plurality of poles to levitate the rotary shaft by using a magnetic force generated by a magnetic field formed by applied electric current, a sleeve journal bearing disposed between the rotary shaft and the magnetic bearing so as to surround the rotary shaft and configured to levitate the rotary shaft by generating a dynamic pressure when the rotary shaft rotates, and a permanent magnet disposed between the plurality of poles and configured to support the rotary shaft by using a magnetic force.

公开(公告)号：US11513032B2

公开(公告)日：2022-11-29

申请号：US16792886

申请日：2020-02-18

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yong Bok Lee ,  Wonil Kwak ,  Junsang Kong ,  Jungwan Kim ,  Yunseok Ha

IPC: G01M13/045 ,  F16C41/00 ,  H02N2/18 ,  H04W4/38

Abstract: Provided is a system for real-time condition diagnosis of a bearing module including a self-power generation module installed in an outer ring of a bearing to generate electricity using vibration generated from a micro whirling motion of the bearing, a behavior detection unit installed in the bearing to detect behavior information of the bearing in real time, a wireless transmission module connected to the behavior detection unit to transmit the real-time detected behavior information of the bearing to an external device, and a condition diagnosis unit that receives the behavior information of the bearing transmitted from the wireless transmission module and diagnoses condition of the bearing in real time, wherein the real-time behavior information of the behavior detection unit installed in the bearing is transmitted through the electricity obtained by the self-power generation module.