公开(公告)号：US20240395454A1

公开(公告)日：2024-11-28

申请号：US18261957

申请日：2023-02-14

Applicant: Southeast University

Inventor： Ming CHENG ,  Wei QIN ,  Xinkai ZHU ,  Wei HUA ,  Zheng WANG ,  Sa ZHU ,  Zhiyuan XU

IPC: H01F27/34 ,  H01F27/24

Abstract: According to a magnetic core considering the skin effect of magnetic flux and a design method thereof, with a cross-section of a magnetic core through which magnetic flux flows as a reference surface, the shape of the cross-section of the magnetic core is designed according to the electromagnetic characteristics, temperature characteristics, magnetic flux amplitude and operating frequency of the magnetic core, and a closed or discontinuous air path is formed inside the magnetic core by stretching the reference surface along the path of the magnetic flux, thereby forming a magnetic core having a duct structure. When a high-frequency magnetic flux is introduced into the magnetic core, the magnetic core considering the skin effect of magnetic flux and the design method thereof can reduce the weight of the magnetic core, reduce the power loss and temperature rise of the magnetic core, and suppress the skin effect of the magnetic core.

公开(公告)号：US20220416679A1

公开(公告)日：2022-12-29

申请号：US17622234

申请日：2021-02-04

Applicant: SOUTHEAST UNIVERSITY

Inventor： Zheng WANG ,  Yang XU ,  Pengcheng LIU ,  Zhixiang ZOU ,  Ming CHENG

IPC: H02M5/297 ,  H02M3/335 ,  H02M1/00

Abstract: A current fed high-frequency isolated matrix converter and the corresponding modulation and control schemes are provided. The converter includes a current source full-bridge converter, a high-frequency transformer, a matrix converter, and a three-phase filter. An optimized space vector modulation solution is used for controlling the converter, and by comparing magnitudes of three-phase filter capacitor voltages to determine an action sequence of space vectors, switch tubes are turned on at zero voltage. A current source full-bridge circuit adopts a commutation strategy of a secondary clamping, and by calculating a leakage inductive current commutation time, full-bridge switch tubes are turned off at zero current to achieve safe and reliable commutation, and having advantages of a low system loss, a high efficiency, and a high power density.

公开(公告)号：US20190260247A1

公开(公告)日：2019-08-22

申请号：US16345734

申请日：2016-11-11

Applicant: SOUTHEAST UNIVERSITY

Inventor： Wei HUA ,  Hengliang ZHANG ,  Ming CHENG

IPC: H02K1/27 ,  H02K21/22 ,  H02K7/00

Abstract: A magnetic flux switching hub motor having a permanent magnet rotor, comprising: a wheel rim, a stator core, an armature winding which is wound on the stator core, and a plurality of rotor units, wherein rotor units are fixed inside the wheel rim, and a rotor unit comprises a permanent magnet and rotor cores which are arranged on two sides of the permanent magnet, the magnetization direction of the permanent magnet being tangential magnetization, and a magnetization direction of each permanent magnet being the same. The motor has the advantages of being high power, and having strong saturation and overload resistance, high reluctance torque, good flux-weakening performance, a broad speed regulation range, a high degree of manufacturing integration, suitability for modular manufacturing processes, and the like.