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公开(公告)号：US11611307B2
公开(公告)日：2023-03-21
申请号：US17621256
申请日：2020-12-07
Applicant: JIANGSU UNIVERSITY
Inventor： Qian Chen , Yuhang Xia , Licheng Gu , Wenxiang Zhao , Guohai Liu
IPC: H02H7/08 , H02P29/028 , H02P29/60 , H02P25/22
Abstract: A short-circuit fault-tolerant control method based on deadbeat current tracking for a five-phase permanent magnet motor with a sinusoidal back-electromotive force or a trapezoidal back-electromotive force (EMF) is provided. By fully utilizing a third harmonic space of a five-phase permanent magnet motor in a fault state, the method proposes a fault-tolerant control strategy for a five-phase permanent magnet motor with a sinusoidal back-EMF or a trapezoidal back-EMF in case of a single-phase short-circuit fault. The method enables the five-phase permanent magnet motor to make full use of the third harmonic space during fault-tolerant operation, thereby improving the torque output of the motor in a fault state and improving the fault-tolerant operation efficiency of the motor. The method achieves desirable fault-tolerant performance and dynamic response of the motor, and expands the speed range of the motor during fault-tolerant operation.
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公开(公告)号：US11356045B2
公开(公告)日：2022-06-07
申请号：US17417503
申请日：2020-04-28
Applicant: JIANGSU UNIVERSITY
Inventor： Wenxiang Zhao , Huanan Wang , Tao Tao , Dezhi Xu
Abstract: A double virtual voltage vectors predictive torque control method without weighting factor for five-phase permanent magnet synchronous motor includes: obtaining the current component in the two-phase stationary coordinate system and the outputting voltage at k interval; one step delay compensation is performed to obtain the current component in the two-phase stationary coordinate system at k+1 interval; predicting the flux and torque of motor at k+1 interval; calculating the reference voltage vector needed by the motor at k+1 interval according to the deadbeat principle and selecting the first virtual voltage vector; selecting the second virtual voltage vector according to the voltage error tracking principle and calculating the duration of the first virtual voltage vector and the second virtual voltage vector respectively and then synthesizing the two vectors and outputting.
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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.
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公开(公告)号：US20190229666A1
公开(公告)日：2019-07-25
申请号：US16257178
申请日：2019-01-25
Applicant: JIANGSU UNIVERSITY
Inventor： Huawei Zhou , Zhen Lu , Guohai Liu , Wenxiang Zhao , Jinghua Ji , Long Chen
Abstract: Disclosed are fault-tolerant permanent-magnet vernier cylindrical electric motors with an electromagnetic suspension and a fault-tolerant vector control method for a short circuit of two adjacent phases. The fault-tolerant permanent-magnet vernier cylindrical electric motor with an electromagnetic suspension and the fault-tolerant vector control method for a short circuit of two adjacent phases suppress motor thrust ripples caused by a fault of two adjacent phases of an electric motor. The dynamic performance and the steady-state performance thereof are consistent with those under a normal state, and the switching frequency of a voltage source inverter is constant.
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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.
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Patent Agency Ranking
6.发明申请公开(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
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).
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公开(公告)号：US12081147B2
公开(公告)日：2024-09-03
申请号：US18038215
申请日：2021-03-02
Applicant: Jiangsu University
Inventor： Wenxiang Zhao , Shengdao Zhu , Guohai Liu , Jinghua Ji
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.
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公开(公告)号：US12003203B2
公开(公告)日：2024-06-04
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.
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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
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.
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10.发明授权公开(公告)号：US11489429B2
公开(公告)日：2022-11-01
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.
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