公开(公告)号：US20230396196A1

公开(公告)日：2023-12-07

申请号：US18032712

申请日：2020-11-11

Applicant: KOREA INSTITUTE OF OCEAN SCIENCE & TECHNOLOGY

Inventor： So Young SUNG ,  Hee Jin KANG ,  Hyung Won SHIM ,  Youngshik KIM ,  Yunho KIM ,  Jang Pyo HONG

IPC: H02P21/13 ,  G01R31/34 ,  G01R19/00 ,  H02P21/22

CPC classification number: H02P21/13 ,  G01R31/34 ,  G01R19/0092 ,  H02P21/22

Abstract: Provided, according to one embodiment, is a method for determining a current of an electric motor or a generator, the method comprising the steps of: acquiring characteristics of a filter for eliminating noise occurring in a process for determining a current of an electric motor or a generator; determining a time delay caused by the filter, on the basis of a change in a phase indicating the characteristics of the filter, the change resulting from a change in an operating frequency of the electric motor or the generator; and determining the current of the electric motor or the generator by compensating the time delay.

公开(公告)号：US20230378848A1

公开(公告)日：2023-11-23

申请号：US17816822

申请日：2022-08-02

Applicant: Korea Institute of Ocean Science & Technology

Inventor： Hee Jin KANG ,  Yunho KIM

IPC: H02K7/09 ,  B63H9/02

CPC classification number: H02K7/09 ,  B63H9/02

Abstract: A magnetic levitation rotor sail is proposed. The rotor sail may include a coil unit provided at a lower portion of a body of the rotor sail, and an electromagnet configured to levitate the coil unit. The rotor sail may also include a support member supporting the electromagnet, and a gap sensor provided at the support member and configured to measure a gap between the coil unit and the electromagnet.