公开(公告)号：US20220084732A1

公开(公告)日：2022-03-17

申请号：US17355639

申请日：2021-06-23

Applicant: Hunan University of Science and Technology

Inventor： Zhao-Hua Liu ,  Qi-Wei Xia ,  Chang-Tong Wang ,  Lei Chen ,  Zhu Zhang ,  Hong-Qiang Zhang ,  Xiao-Hua Li

IPC: H01F13/00 ,  G06N20/00 ,  G06N3/04 ,  G01R31/34 ,  H02P29/032

Abstract: A PMSM demagnetization fault diagnosis method based on fuzzy intelligent learning of torque signals, which includes the following steps of: acquiring torque ripple signals of permanent magnet synchronous motors under different demagnetization faults; calculating a fuzzy membership of the torque ripple signals; decomposing and reconstructing the torque ripple signals by using wavelet packet decomposition to obtain wavelet packet coefficients; calculating the energy of the wavelet packet coefficients, constructing a feature vector sample set with the fuzzy membership, and dividing it into a training set and a test set; constructing Fuzzy Extreme Learning Machine (FELM), and inputting the training set into the FELM for training; inputting the test set into the trained FELM, and calculating classification accuracy. The disclosure solves the problem of unbalanced and irregular training sample distribution by integrating fuzzy theory into the Extreme Learning Machine to fuzzify the torque ripple signal samples under demagnetization fault.

公开(公告)号：US11196374B2

公开(公告)日：2021-12-07

申请号：US17037873

申请日：2020-09-30

Applicant: Hunan University of Science and Technology

Inventor： Xiaoping Zhang ,  Ping Liu ,  Sijian Kuang ,  Zhu Zhang

IPC: H02P7/00 ,  H02P23/14 ,  G06F30/23 ,  H02K3/47

Abstract: A modeling method of a stator winding air gap for temperature field analysis of an AC traction motor includes: changing the width of an air gap of a stator winding equivalent model according to a set value of spacing; establishing a three-dimensional finite element model of the AC traction motor with the stator winding air gap; based on the three-dimensional finite element model of different widths of the air gap, analyzing a temperature field to obtain a temperature field distribution diagram of the AC traction motor; carrying out the numerical fitting according to data in the temperature distribution diagram to obtain a function relation between the air-gap width and the temperature of the stator winding equivalent model; and by measuring the actual temperature of a motor stator winding, calculating an optimal air-gap width corresponding to the modeling of the stator winding of the current AC traction motor.

公开(公告)号：US11264933B2

公开(公告)日：2022-03-01

申请号：US17163980

申请日：2021-02-01

Applicant: Hunan University of Science and Technology

Inventor： Xiaoping Zhang ,  Sijian Kuang ,  Ping Liu ,  Zhu Zhang ,  Haipeng Jiang ,  Shaowu Zhou

IPC: H02P25/089

Abstract: A sensorless control method and an apparatus for a three-phase switched reluctance motor. The sensorless control method obtains line inductances of three phases according to real-time phase inductances of the three-phase switched reluctance motor and then determines feature points of the line inductances of the three phases. A position angle of the rotor at any time in the next corresponding region is calculated according to an average rotation speed of the rotor in the region corresponding to two adjacent feature points. A control signal is output to realize a precise sensorless control for the three-phase switched reluctance motor. The control apparatus includes a microcontroller, a power conversion circuit, a drive module for the power conversion circuit, a current detection module, a voltage detection module, an input and output module and a direct current regulated power supply.