公开(公告)号：US20220209641A1

公开(公告)日：2022-06-30

申请号：US17434429

申请日：2020-12-04

Applicant: JIANGSU UNIVERSITY

Inventor： Wenxiang ZHAO ,  Tingting JIANG ,  Liang XU ,  Jinghua JI

IPC: H02K41/03

Abstract: A field modulated doubly salient motor and a design method for a distribution of salient pole teeth thereof are provided. The motor includes a stator and a mover, wherein the stator includes a stator core, two sets of windings, and two sets of permanent magnets. Each of the stator teeth is split into two field winding teeth, and each of the field winding teeth is split into two salient pole teeth. The two sets of windings are respectively armature windings and field windings, wherein the armature windings are wound around. stator teeth, and the field windings are wound around adjacent field winding teeth that are split from different stator teeth. The two sets of tangentially magnetized permanent magnets are respectively placed on openings and bottoms of field winding slots, and permanent magnets placed in the same slot or at the same positions of adjacent slots have opposite polarities.

公开(公告)号：US20240386166A1

公开(公告)日：2024-11-21

申请号：US18681093

申请日：2023-07-07

Applicant: JIANGSU UNIVERSITY

Inventor： Wenxiang ZHAO ,  Tong LIU ,  Jinghua JI ,  Donghui CAO

IPC: G06F30/23 ,  G06F30/17 ,  G06F111/04 ,  G06F119/14

Abstract: A modeling method for electromagnetic forces and vibration response of a SPM machine, belonging to the field of combined electromagnetic field and structural mechanics computation. First, build the circuit-based EMN model, regular EMN model, and discrete EMN model with equivalent magnetic source and permeance for the different regions of the SPM machine. Second, based on the spatial relationships between each part in the SPM machine, the EMN models of each region are interconnected to form a complete model of the discrete EMN model. The non-sinusoidal high-frequency current harmonics are introduced as input excitation to the discrete EMN model. The global nonlinear matrix equation is solved simultaneously to determine the magnetic flux density in the air gap permeance elements, enabling the air gap electromagnetic force density calculation. Subsequently, the calculated electromagnetic force density is transformed into concentrated forces on the surface of the stator teeth.

公开(公告)号：US20210167652A1

公开(公告)日：2021-06-03

申请号：US15778938

申请日：2017-06-30

Applicant: JIANGSU UNIVERSITY

Inventor： Qian CHEN ,  Xun FAN ,  Guohai LIU ,  Wenxiang ZHAO ,  Jinghua JI ,  Gaohong XU

IPC: H02K3/28 ,  H02K29/03

Abstract: This invention proposes a method to regulate high efficiency region of permanent magnet motor. The internal relationship between the point with maximum efficiency and the points around it is firstly revealed. Then, the optimal combination of copper loss, iron loss and permanent magnet eddy-current loss is presented when maximum efficiency point moves toward different directions. Hence, the method for regulating high efficiency region can be obtained. This method can be suitable for any type of permanent magnet motors, which can adjust high efficiency region to the dense working point area of the motor under different operating conditions according to design requirements. If this method is used into electric vehicle, it can combine the high efficiency region with the electric vehicle driving cycle to reduce energy consumption and enhance the life mileage of electric vehicle effectively.

公开(公告)号：US20190229573A1

公开(公告)日：2019-07-25

申请号：US15782003

申请日：2016-11-29

Applicant: JIANGSU UNIVERSITY

Inventor： Wenxiang ZHAO ,  Tao TAO ,  Jihong ZHU ,  Jinghua JI ,  Deshui HU

IPC: H02K3/28 ,  H02P27/06 ,  H02P6/08 ,  H02K21/16 ,  H02P25/092 ,  H02K19/10

Abstract: A permanent magnet brushless motor has a stator, an armature winding, a rotor, and a permanent magnet. The stator is provided with an armature groove. The armature winding is placed in the armature groove. The stator and the rotor are spaced apart by an air gap; the permanent magnet is attached to the surface of the rotor, and is magnetized by a Halbach array structure. The motor is an eight-phase motor, and phases are evenly distributed at a phase belt angle of 45°. The motor and the proposed control algorithm have good fault-tolerant effects, and the average torque after fault tolerance is basically consistent with that in normal operation.

公开(公告)号：US20190006973A1

公开(公告)日：2019-01-03

申请号：US15748926

申请日：2016-08-17

Applicant: Jiangsu University

Inventor： Huawei ZHOU ,  Guohai LIU ,  Jinghua JI ,  Wenxiang ZHAO ,  Qian CHEN ,  Long CHEN

IPC: H02P21/14 ,  H02P21/22 ,  H02P25/064 ,  H02P27/04 ,  H02P25/22

CPC classification number: H02P21/14 ,  B60K1/00 ,  B60Y2400/60 ,  H02P21/22 ,  H02P21/50 ,  H02P25/064 ,  H02P25/22 ,  H02P27/04 ,  H02P29/0243 ,  H02P29/027 ,  H02P29/032

Abstract: The invention proposes a fault-tolerant field-oriented control method of five-phase interior permanent-magnet fault-tolerant linear motor (IPM-FTLM) with two nonadjacent short-circuit phase faults. Firstly, the extended Clark transformation matrix can be obtained according to the principle that magnetic motive force (MMF) keeps constant before and after the two-phase open-circuit faults, the constraint that the sum of healthy phase currents is zero and the adjacent two-phase current amplitude is equal. The back electric motive force (EMF) can be estimated by the transposed matrix. The nonlinear strong coupling system becomes the first-order inertia system when using the internal mode controller, the first-order inertia feed-forward voltage compensator and back-EMF observer, as the motor is with fault. Then, according to the principle that the sum of MMF of the healthy phase short-circuit compensation currents and two phases short-circuit fault currents is zero, the short-circuit compensation voltage can be obtained, and then these voltages add vector-controller output voltages, respectively. The invention not only restrains the thrust force fluctuation caused by two nonadjacent short-circuit phase faults, but also more importantly keeps the same dynamic and steady performance as the normal conditions, and also it has the constant switching frequency of voltage source inverter.

公开(公告)号：US20240135049A1

公开(公告)日：2024-04-25

申请号：US18276655

申请日：2021-10-21

Applicant: JIANGSU UNIVERSITY

Inventor： Wenxiang ZHAO ,  Yi WANG ,  Jinghua JI ,  Wei TIAN

IPC: G06F30/17

CPC classification number: G06F30/17

Abstract: An analysis of a surface mounted permanent magnet (SPM) machine by a 2D meshless method is provided. The 2D meshless method includes steps: discrete nodes are arranged in the region to be solved; based on Taylor expansion and weighted least squares principle, the derivative value of vector potential can be approximated as a linear combination of vector potential values of each node in the support region; partial differential equations are converted into algebraic equations; by solving the algebraic equations, the vector potential of each node can be calculated, and then the distribution of the flux line and the flux density can be obtained. According to the electromagnetic calculation constraints of the machine, parameters such as the back electromotive force and electromagnetic torque of the machine can be obtained.

公开(公告)号：US20240106360A1

公开(公告)日：2024-03-28

申请号：US18038215

申请日：2021-03-02

Applicant: Jiangsu University

Inventor： Wenxiang ZHAO ,  Shengdao ZHU ,  Guohai LIU ,  Jinghua JI

IPC: H02P21/05 ,  H02K1/276 ,  H02P21/14

CPC classification number: H02P21/05 ,  H02K1/2766 ,  H02P21/141 ,  H02K2213/03 ,  H02P21/0017

Abstract: The present disclosure provides a method for reducing the electromagnetic vibration of a fractional slot concentrated winding (FSCW) permanent magnet (PM) motor, which provides a guidance for the low vibration design of FSCW PM motor. The implementation of the method includes: Based on Nyquist Shannon sampling theorem, the modulation effect of electromagnetic force in the air gap is obtained, and the electromagnetic force component that contributes the most to the electromagnetic vibration of the FSCW PM motor is determined. The equivalent analytical model of PM flux density is established to obtain the phase relationship between different flux density harmonics. According to Maxwell stress equation, the internal relationship between each order of flux density harmonics and electromagnetic force harmonics is obtained. A new magnet structure of the PM motor is designed, and specific flux density harmonics are injected to reduce the electromagnetic force and electromagnetic vibration of the FSCW PM motor.

公开(公告)号：US20230163710A1

公开(公告)日：2023-05-25

申请号：US17639336

申请日：2020-12-04

Applicant: JIANGSU UNIVERSITY

Inventor： Jinghua JI ,  Yuxuan DU ,  Wenxiang ZHAO ,  Linsen HUANG ,  Tao TAO

IPC: H02P27/08

CPC classification number: H02P27/085

Abstract: A model predictive decomposition control method and device for an open-winding five-phase permanent magnet synchronous motor is provided. The method includes obtaining the voltage component in the stationary coordinate system under the orientation of the rotor magnetic field, synthesizing the virtual voltage vector that can eliminate the voltage vector in harmonic space according to the vector distribution of the five-phase permanent magnet synchronous motor under the voltage source inverter. The open winding permanent magnet synchronous motor topology is equivalent to the superposition of the independent actions of two inverters. The voltage vector generated by a single inverter is predicted through the mathematical model of the motor. The expected increment is a judgment condition to determine whether the open winding system uses one of the two inverters to maintain the normal operation of the open winding system, or the first inverter is clamped and the second inverter generates the remaining increment.

公开(公告)号：US20210359565A1

公开(公告)日：2021-11-18

申请号：US16487021

申请日：2019-01-04

Applicant: JIANGSU UNIVERSITY

Inventor： Guohai LIU ,  Meimei XU ,  Wenxiang ZHAO ,  Jinghua JI ,  Qian CHEN ,  Zhijian LING

IPC: H02K3/28 ,  H02K1/27

Abstract: The present invention relates to a fault-tolerant modular permanent magnet assisted synchronous reluctance motor (PMaSynRM) and provides a modular winding connection method. The modular winding connection is to change the positions of inlet and outlet coils based on the slot electrical potential star vectogram. Then, each module has a separate set of winding and the left and right relative distribution will be adopted on the winding connection. The invention has the advantages of modularization in structure, high independence between the modules, effectively avoiding overlapping of magnetic lines between the modules, and improving fault tolerance and reliability of the motor. The invention has the advantages of modularization in structure, high independence between the modules, magnetic decoupling between the modules, and improvement of fault tolerance and reliability of the motor.

公开(公告)号：US20180323665A1

公开(公告)日：2018-11-08

申请号：US15544212

申请日：2016-03-16

Applicant: JIANGSU UNIVERSITY

Inventor： Qian CHEN ,  Wenxiang ZHAO ,  Guohai LIU ,  Jinghua JI ,  Gaohong XU ,  Zhipeng LIN

IPC: H02K1/27 ,  H02K16/00 ,  H02P21/16 ,  H02K15/03

CPC classification number: H02K1/27 ,  H02K1/246 ,  H02K1/276 ,  H02K3/28 ,  H02K15/03 ,  H02K16/00 ,  H02K19/103 ,  H02K21/24 ,  H02P21/00 ,  H02P21/16 ,  H02P21/50 ,  H02P25/024 ,  H02P25/08 ,  H02P2207/05

Abstract: The invention proposes a new motor with separated permanent magnet torque and reluctance torque. Meanwhile, the optimal efficiency control method for this motor is proposed. This invention belongs to the field of motor and its drive system. The proposed motor includes 3 stators and 1 rotor (composed of 2 axial rotors and 1 radial rotor), the radial stator employs distributed winding, the axial stator adopts concentrated winding. The distributed winding and the radial reluctance rotor structure contribute to higher reluctance torque, while the concentrated winding and the surface mount permanent magnet structure offer higher permanent magnet torque. In the view of the magnetic circuit, the axial magnetic circuit generates the permanent magnet torque, and the radial magnetic circuit generates the reluctance torque. By using the decoupling of axial and radial magnetic circuits, the separation and the independent control of the permanent magnet torque and the reluctance torque are realized. Each stator and rotor of the invention can be processed independently, and the modular installation can be processed, thereby reducing the difficulty of the motor processing.