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    Fault-tolerant field-oriented control method of five-phase interior permanent-magnet linear motor under two nonadjacent short-circuit phase faults
    3.
    发明授权
    Fault-tolerant field-oriented control method of five-phase interior permanent-magnet linear motor under two nonadjacent short-circuit phase faults 有权

    公开(公告)号：US10574164B2

    公开(公告)日：2020-02-25

    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 ,  H02P25/064 ,  B60K1/00 ,  H02P29/024 ,  H02P21/00 ,  H02P29/032 ,  H02P21/22 ,  H02P25/22 ,  H02P27/04

    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.

    DOUBLE STATOR PERMANENT MAGNET CURSOR LINEAR MOTOR AND DESIGN METHOD FOR INCREASING MAGNETIC FIELD MODULATION EFFECT
    4.
    发明申请
    DOUBLE STATOR PERMANENT MAGNET CURSOR LINEAR MOTOR AND DESIGN METHOD FOR INCREASING MAGNETIC FIELD MODULATION EFFECT 审中-公开

    公开(公告)号：US20180301968A1

    公开(公告)日：2018-10-18

    申请号：US15776397

    申请日：2015-12-09

    Applicant: JIANGSU UNIVERSITY

    Inventor： Wenxiang Zhao ,  Jian Zhu ,  Jinghua Ji ,  Guohai Liu ,  Zhengmeng Liu ,  Qian Chen ,  Jinwei Chen

    IPC: H02K21/38 ,  H02K41/03

    Abstract: Disclosed is a double-stator linear vernier permanent magnet (DS-LVPM) motor and method to increase the magnetic field modulation effect. The motor contains a primary, and first and second secondaries on both sides of the primary, spaced by an air gap. The motor secondary includes modulation teeth. The primary is bilaterally symmetrical, and permanent magnets (PM) are embedded in the yoke of the primary core elements. The design solves the inherent problem of flux leakage at the end of PMs for conventional VPM motors, so as to improve utilization of PMs, thereby increasing thrust density of the motors. Additionally, the motor secondaries are laminated by silicon steel sheet, which saves PM material and significantly reduces cost for linear long stroke applications. By adjusting PM structure parameters, the design can use finite element method (FFM) to calculate repeatedly to get PM structure parameters corresponding to maximum electromotive force (EMF).

    Method to reduce torque ripple of permanent magnet synchronous motor
    5.
    发明授权
    Method to reduce torque ripple of permanent magnet synchronous motor 有权

    公开(公告)号：US10530278B1

    公开(公告)日：2020-01-07

    申请号：US15772433

    申请日：2017-02-06

    Applicant: Jiangsu University

    Inventor： Guohai Liu ,  Xinxin Du ,  Wenxiang Zhao ,  Qian Chen ,  Deshui Hu

    IPC: H02P6/10

    Abstract: A method named as Magnet Shifting to reduce torque ripple of permanent magnet synchronous motor is disclosed. A way of reasonably choosing the repeating unit of magnetic pole, the shifting ways and the shifting angle calculation of the first and second magnet shifting is described, which are carried on the repeating unit of magnetic poles individually or repeatedly to improve the performance of the motor. The method can be applied to surface, surface-inset and inner-embedded permanent magnet motors, which can reduce torque ripple caused by different torque components, including cogging torque, reluctance torque or permanent magnet torque. It also can quickly calculate the shifting angle of the magnetic pole by choosing repeating unit reasonably. Magnet shifting can effectively enhance the sinusoidal degree of back electrodynamic force (back-EMF) waveform, where the repeating units can offset the torque ripple between the maximum and the minimum value to reduce the different torque harmonics. Also, the output torque can be maintained nearly to the original value while less vibration noise of the motor is inevitably introduced.

    Fault-tolerant modular permanent magnet assisted synchronous reluctance motor and modular winding design method
    7.
    发明授权
    Fault-tolerant modular permanent magnet assisted synchronous reluctance motor and modular winding design method 有权

    公开(公告)号：US11522400B2

    公开(公告)日：2022-12-06

    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 ,  H02K1/276

    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.

    Fault-tolerant direct thrust-force control method for five-phase permanent-magnet linear motor with one open-circuit phase fault
    8.
    发明授权
    Fault-tolerant direct thrust-force control method for five-phase permanent-magnet linear motor with one open-circuit phase fault 有权

    公开(公告)号：US11159113B2

    公开(公告)日：2021-10-26

    申请号：US17043705

    申请日：2018-01-31

    Applicant: JIANGSU UNIVERSITY

    Inventor： Huawei Zhou ,  Cheng Zhou ,  Guohai Liu ,  Duo Zhang

    IPC: H02P21/30 ,  H02P23/30 ,  H02P29/024 ,  H02P29/032 ,  H02P6/00 ,  H02P21/14 ,  H02P25/06 ,  H02P25/22 ,  H02P27/06 ,  H02P29/028

    Abstract: In the fault-tolerant direct thrust-force control (FT-DTC) method, the generalized Clarke transform matrix and its inverse matrix are derived according to the fault-tolerant phase currents. The stator fluxes in α-β plane are deduced based on these. Based on the requirement of circular stator flux trajectory, virtual stator fluxes are defined, and then compensatory voltages in the α-β plane are obtained. Actual stator voltages in the α-β plane are calculated by modulation function of voltage source inverter. Combining with the compensatory voltages, the actual stator voltages and the stator currents, the virtual stator fluxes and the thrust-force are estimated by the flux and thrust-force observers. The thrust-force reference, the stator flux amplitude reference, the observed thrust-force and virtual stator flux are applied to predict virtual stator voltage references. The actual stator voltage references is calculated according to virtual voltage references and compensatory voltages, and are fed to voltage source inverter.

    Double stator permanent magnet linear motor and design method for increasing magnetic field modulation
    10.
    发明授权
    Double stator permanent magnet linear motor and design method for increasing magnetic field modulation 有权

    公开(公告)号：US10541595B2

    公开(公告)日：2020-01-21

    申请号：US15776397

    申请日：2015-12-09

    Applicant: JIANGSU UNIVERSITY

    Inventor： Wenxiang Zhao ,  Jian Zhu ,  Jinghua Ji ,  Guohai Liu ,  Zhengmeng Liu ,  Qian Chen ,  Jinwei Chen

    IPC: H02K41/03 ,  H02K21/44

    Abstract: Disclosed is a double-stator linear vernier permanent magnet (DS-LVPM) motor and method to increase the magnetic field modulation effect. The motor contains a primary, and first and second secondaries on both sides of the primary, spaced by an air gap. The motor secondary includes modulation teeth. The primary is bilaterally symmetrical, and permanent magnets (PM) are embedded in the yoke of the primary core elements. The design solves the inherent problem of flux leakage at the end of PMs for conventional VPM motors, so as to improve utilization of PMs, thereby increasing thrust density of the motors. Additionally, the motor secondaries are laminated by silicon steel sheet, which saves PM material and significantly reduces cost for linear long stroke applications. By adjusting PM structure parameters, the design can use finite element method (FEM) to calculate repeatedly to get PM structure parameters corresponding to maximum electromotive force (EMF).

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