公开(公告)号：US12068646B2

公开(公告)日：2024-08-20

申请号：US17606737

申请日：2021-01-21

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Dawei Li ,  Li Fang ,  Xiang Ren ,  Ronghai Qu

IPC: H02K21/22 ,  H02K1/2791

CPC classification number: H02K21/22 ,  H02K1/2791 ,  H02K2213/03

Abstract: A method includes calculating an initial phase θgv of each air gap working magnetic field Bgv required to generate positive back EMF based on certain parameters of each armature harmonic vth; generating Bgv and maximizing a sum of equivalent air gap flux density amplitude Beqv of each of the air gap working magnetic fields Bgv while calculating a phase θmv and a pole arc coefficient αv corresponding to each permeance harmonic; designing a number, a position(s) and a length(s) along a circumference of modulation teeth corresponding to each of the permeance harmonics based on the phase θmv and the pole arc coefficient αv, such that a generated permeance model is consistent with the phase θmv of each of the permeance harmonics; and optimizing radial dimensions of modulation teeth corresponding to each of the permeance harmonics to maximize the sum of equivalent air gap flux density amplitude Beqv.

公开(公告)号：US11990793B2

公开(公告)日：2024-05-21

申请号：US17765847

申请日：2021-01-21

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Dawei Li ,  Li Fang ,  Xiang Ren ,  Ronghai Qu

IPC: H02K1/17 ,  H02K1/14

CPC classification number: H02K1/17 ,  H02K1/146

Abstract: A vernier permanent magnet motor with a stator having coded auxiliary teeth which belongs to the technical field of permanent magnet motors. The motor includes a stator and a rotor that are coaxially sleeved, and an air gap is formed between the stator and the rotor. Coded auxiliary tooth structures are provided on a side surface in the stator close to the air gap, and first permanent magnets are provided on part of the coded auxiliary tooth structures. A plurality of pairs of second permanent magnets and ferromagnets are arranged around a side surface in the rotor close to the air gap. The first permanent magnets and the ferromagnets generate a first magnetic field, the second permanent magnets and the coded auxiliary tooth structures generate a second magnetic field, and the magnetic fields are superimposed to form working magnetic fields.

公开(公告)号：US11662209B2

公开(公告)日：2023-05-30

申请号：US16762505

申请日：2019-09-23

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Jing Hu ,  Binzhe Li ,  Li Fang ,  Tao Xiong ,  Xiang Gao ,  Susu Kang ,  Kan Jiang

IPC: G01C21/24 ,  G01C21/02 ,  G01C21/20 ,  B64G3/00

CPC classification number: G01C21/20 ,  G01C21/02

Abstract: The invention discloses a preferable short arc initial orbit determining method based on Gauss solution cluster, and belongs to the astrodynamics field, including: grouping the observation data, using Gauss method to obtain the target state vector at the corresponding time point for each group of data, forming a solution set of preliminary estimation; dividing the solution set of preliminary estimation into a position component vector solution set and a velocity component vector solution set for clustering to obtain a position component vector solution cluster and a velocity component vector solution cluster; based on the position component vector solution cluster and the velocity component vector solution cluster, generating a two-dimensional trajectory solution set; evaluating each of the two-dimensional trajectories by using a trajectory optimal method, calculating the number of root of orbits corresponding to the optimal two-dimensional trajectory, thereby completing determination of initial orbit.