公开(公告)号：US20240364247A1

公开(公告)日：2024-10-31

申请号：US18624043

申请日：2024-04-01

申请人： ZHEJIANG UNIVERSITY ,  ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER

发明人： Mengting YE ,  Yanfei CAO ,  Zhichen LIN ,  Zhiqiang WANG ,  Tingna SHI ,  Changliang XIA

IPC分类号： H02P21/18 ,  H02P21/00 ,  H02P21/22

CPC分类号： H02P21/18 ,  H02P21/0017 ,  H02P21/22 ,  H02P2207/05

摘要： A direct locating method for calculating a position of a permanent magnet synchronous motor is provided. The direct locating method performed by a processor includes: three-phase stator currents of the permanent magnet synchronous motor are converted by coordinate to obtain the stator currents in the αβ two-phase stationary coordinate system, and the initial position region is determined. The stator currents in dq two-phase synchronous rotating coordinate system are obtained by coordinate conversion. The stator current cost model is established. Then the d-axis stator current is inputted into the cost model and the position is outputted, and the final estimated position is determined to realize the direct locating of the permanent magnet synchronous motor's position.

公开(公告)号：US20240038074A1

公开(公告)日：2024-02-01

申请号：US18352669

申请日：2023-07-14

申请人： Hainan Institute of Zhejiang University ,  Zhejiang University

发明人： Yong He ,  Xiaoyue DU ,  Liyuan ZHENG ,  Liwen HE ,  Shuiguang DENG ,  Chongde SUN

IPC分类号： G08G5/00 ,  G06V20/17 ,  G06V20/10

CPC分类号： G08G5/003 ,  G06V20/17 ,  G06V20/194

摘要： The present disclosure provides a method and system for determining an optimal flight height of an unmanned aerial vehicle (UAV), an electronic device, and a medium. The method includes: obtaining a multi-band crop spectral image of an experimental area in a preset scenario; performing data processing on the multi-band crop spectral image, to obtain multi-spectral orthographies of a plurality of sample plots; calculating a ground resolution of the multi-spectral orthography of each sample plot, simulating and determining a multi-band crop spectral image of each sample plot at a different flight height by a nearest neighbor interpolation method based on the ground resolution of the multi-spectral orthography of each sample plot; and for the multi-band crop spectral image of each sample plot at the different flight height, determining an optimal flight height corresponding to each sample plot by a hypothetical test method.

公开(公告)号：US11811339B2

公开(公告)日：2023-11-07

申请号：US17794986

申请日：2021-08-03

申请人： ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER ,  ZHEJIANG UNIVERSITY

发明人： Tingna Shi ,  Chen Li ,  Yan Yan ,  Changliang Xia

IPC分类号： H02P21/00 ,  H02P21/18 ,  H02P21/22 ,  H02P25/022 ,  H02P27/12

CPC分类号： H02P21/0085 ,  H02P21/0017 ,  H02P21/18 ,  H02P21/22 ,  H02P25/022 ,  H02P27/12

摘要： The present disclosure provides a predictive control method of current increment for a permanent magnet synchronous motor includes: substituting a mathematical expression of a stator voltage during one control period into a continuous time domain current model to obtain a discrete current prediction model and a predicted current at the next time point; obtaining a predicted current increment from a current increment prediction model by subtracting a predictive current at a present time point from a predictive current at a next time point; establishing a cost function according to a preset reference current increment and the predicted current increment; obtaining an optimal voltage increment by minimizing the cost function; superposing the optimal voltage increment on a stator voltage of a present control period to obtain an optimal stator voltage of a next control period for controlling control the permanent magnet synchronous motor.

公开(公告)号：US11750127B2

公开(公告)日：2023-09-05

申请号：US17793935

申请日：2021-08-03

申请人： ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER ,  ZHEJIANG UNIVERSITY

发明人： Zhichen Lin ,  Tingna Shi ,  Zhen Zhang ,  Changliang Xia

IPC分类号： H02P21/14 ,  H02P21/22 ,  H02P21/00 ,  H02P25/022 ,  H02P27/08

CPC分类号： H02P21/14 ,  H02P21/0003 ,  H02P21/22 ,  H02P25/022 ,  H02P27/08

摘要： The invention discloses a control method for balancing scaling errors of multiple current sensors for PMSM. An impedance network is set between a direct current power supply and a three-phase inverter connected to a PMSM to avoid positive and negative poles of the direct current power supply being short-circuited under actions of shoot-through vectors. Under actions of two shoot-through vectors in a PWM cycle, three-phase current sensors are used to respectively sample the sum of currents in each branch of three-phase output branches of the three-phase inverter and a branch of the same bridge arm of the three-phase inverter, according to the sampled currents, operating to obtain the relationship between the scaling error coefficients of the three-phase current sensors. Then, correction coefficients are calculated. The correction of the scaling errors of the current sensors is implemented using correction coefficient feedback control.

公开(公告)号：US20230141130A1

公开(公告)日：2023-05-11

申请号：US17577117

申请日：2022-01-17

申请人： Zhejiang University Zhongyuan Institute ,  Zhejiang University

发明人： Zhiqiang Hou ,  Ziqi Chai ,  Xipan Shu ,  Luqin Luan ,  Shiguo Chen ,  Xingqian Ye

IPC分类号： A23L2/44 ,  A23L2/04

CPC分类号： A23L2/44 ,  A23L2/04

摘要： The present disclosure belongs to the technical field of food processing and provides a phenolic stabilized fruit juice and a preparation method thereof. In the present disclosure, plant RG-I pectin polysaccharide is extracted through an ultra-high pressure technology, and then ultra-high pressure technology is used to promote the interaction of pectin polysaccharides and phenols in fruit juice, improve the stability of phenolic substances in fruit juice, and can improve the bioavailability of phenolic substances in fruit juice. The method of the present disclosure improves the added value of products and solves the problem of low bioavailability of phenolic substances in juice.

公开(公告)号：US11519656B2

公开(公告)日：2022-12-06

申请号：US16817227

申请日：2020-03-12

申请人： Ocean Research Center of Zhoushan, Zhejiang University ,  Zhejiang University

发明人： Yong Cai ,  Shuo Liu ,  Zhijian Yang ,  Kaiyou Jiang ,  Wanglin Lin ,  Yu Zhang ,  Lei Chen ,  Zhiyong Sun ,  Fan Ding ,  Bo Zhang ,  Kai Qiao ,  Hao Wang

IPC分类号： F25D3/11 ,  A23L3/375 ,  F25D29/00 ,  B63B35/24

摘要： A high-precision control system and method for shipborne cryogenic flash freezing of an aquatic product using liquid nitrogen is described. The system may include a main control system, a display unit, a liquid nitrogen supply system, a valve control unit, an acquisition unit, and a power unit. A flash freezing process is divided into four stages: a precooling stage, a flash freezing stage, a deep freezing stage, and a thermal insulation stage. Different cooling rates and flash freezing times are used for different stages, where a cooling rate is used in the flash freezing stage is the highest, a cooling rate used in the deep freezing stage is next, a cooling rate used in the precooling stage is the lowest, and an ambient temperature in a device is kept stable in the thermal insulation stage.

公开(公告)号：US20240350703A1

公开(公告)日：2024-10-24

申请号：US18757627

申请日：2024-06-28

申请人： ZHEJIANG UNIVERSITY ,  SHAOXING RESEARCH INSTITUTE OF ZHEJIANG UNIVERSITY

发明人： Changyou GAO ,  Xiaoqing LIU ,  Qiuyi WANG

IPC分类号： A61L26/00

CPC分类号： A61L26/0066 ,  A61L26/008 ,  A61L2300/406

摘要： A tough antibacterial hydrogel dressing and a preparation method thereof provided. The hydrogel dressing is gelatinized based on hydrogen bonding of gelatinizing skeleton such as polyvinyl alcohol, gelatin, collagen, etc. Before gelatinizing, hyperbranched polylysine is mixed, and after gelatinizing, the mechanical properties are enhanced by soaking in an ionic solution. Physical gelatinizing by hydrogen bonding can avoid the toxicity problem caused by residual crosslinking agent in the chemical crosslinking method, and the shortcoming of poor mechanical properties of hydrogel obtained by physical crosslinking method is overcome by Hoffmeister effect salting-out. The hydrogel dressing prepared has good tensile and compressive properties and antibacterial properties. The hydrogel dressing provided is suitable for various skin wounds, and has the advantages of simple preparation method, high repeatability and low cost, and is expected to be widely used in the field of antibacterial skin dressings.

公开(公告)号：US20240333060A1

公开(公告)日：2024-10-03

申请号：US18733809

申请日：2024-06-04

申请人： ZHEJIANG UNIVERSITY ,  ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER

发明人： Dong YAN ,  Haowei LEI ,  Peidong HU ,  Zhen ZHANG ,  Yan YAN ,  Wei CHEN ,  Tingna SHI

IPC分类号： H02K3/28

CPC分类号： H02K3/28 ,  H02K2213/03

摘要： The invention relates to a double-layer winding layout method suitable for asymmetrical winding machine. The method is implemented by three main steps: 1) the design of the initial double-layer winding layout structure for each machine unit, which is based on the principle of the largest number of spokes belonging to phase A; 2) rearranging the number of spokes in positive (e.g., labeled a-phase belt) and negative sectors (e.g., labeled x-phase belt) belonging to phase A for making slot numbers equally divided; 3) solving the serial number of the stator slot in reverse to get the final winding layout schemes which contain multiple layout structures for one slot-pole combination. The method of the present invention improves the conventional star-of-slot theory based on the distribution characteristics of the asymmetrical windings, perfects the general design theory of double-layer asymmetrical winding structure.

公开(公告)号：US12069170B2

公开(公告)日：2024-08-20

申请号：US18540943

申请日：2023-12-15

申请人： ZHEJIANG UNIVERSITY ,  JIAXING RESEARCH INSTITUTE, ZHEJIANG UNIVERSITY

发明人： Bingsheng Zhang ,  Yibiao Lu ,  Weiran Liu ,  Kui Ren

IPC分类号： H04L9/08

CPC分类号： H04L9/0869

摘要： A multi-party privacy computing method and device based on semi-trusted hardware, wherein the method applied to semi-trusted hardware comprises the following steps: acquiring random number masks and random seeds of all user terminals; generating a garbled circuit seed according to the random seeds; generating a garbled circuit according to a predetermined circuit description and the garbled circuit seed, wherein the garbled circuit comprises garbled tables, wire labels and decoding information; sending the wire labels corresponding to the inputs of all user terminals to a user terminal corresponding to the semi-trusted hardware by using an oblivious transfer protocol; and sending the garbled table and the decoding information to the user terminal corresponding to the semi-trusted hardware, so that the user terminal can compute an output value according to the garbled tables, the decoding information and the wire label corresponding to the inputs of all user terminals.

公开(公告)号：US11881752B2

公开(公告)日：2024-01-23

申请号：US18012984

申请日：2022-01-04

申请人： ZHEJIANG UNIVERSITY ,  ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER

发明人： Yiming Shen ,  Yanfei Cao ,  Yan Yan ,  Tingna Shi ,  Changliang Xia

IPC分类号： H02K41/03 ,  H02P25/064 ,  H02K11/215 ,  B65G54/02

CPC分类号： H02K41/031 ,  B65G54/02 ,  H02K11/215 ,  H02P25/064

摘要： A direct-drive type annular flexible transportation system and a collaborative control method thereof are provided. The direct-drive type annular flexible transportation system includes an annular base, a primary excitation type linear motor, an power supplying module, a power driving module, a position detection module, and a wireless communication module. The primary excitation type linear motor includes a long stator and a plurality of movers. The long stator is formed by connection of stator iron cores presenting a multi-segment cogging structure and is installed on the annular base. Each of the movers includes a short primary, a power driving module, a position detection module, and a wireless communication module. The short primary is formed by an asymmetrically-structured permanent magnet array, an armature winding, and a primary iron core.