公开(公告)号：US12181382B2

公开(公告)日：2024-12-31

申请号：US17941235

申请日：2022-09-09

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Yongping Jin ,  Xiaobin He ,  Youduo Peng ,  Ping Liu

IPC: G01N1/08 ,  E21B7/12 ,  E21B41/00 ,  G01N33/24

Abstract: A micro core-drilling testing system for high-pressure environment, including: a pressure chamber, a micro core-drilling testing platform and a control device. The micro core-drilling testing platform includes a lower tray, a middle tray, a hydraulic system, a stroke cylinder, a rock sample plate, a rock sample block, a pressure compensation device and a drilling rig. The drilling rig is configured to carry out core-drilling operation. The hydraulic system is configured to provide power for the drilling rig. The pressure compensation device is configured to balance the pressure inside the pressure chamber and the hydraulic system.

公开(公告)号：US11812732B2

公开(公告)日：2023-11-14

申请号：US17148988

申请日：2021-01-14

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Yongping Jin ,  Guangping Liu ,  Youduo Peng ,  Buyan Wan ,  Ping Liu ,  Kun Xie

IPC: A01K79/00

CPC classification number: A01K79/00

Abstract: A suction sampler system for in situ collection of deep-sea floor organisms includes a pressure-retaining cylinder, a pressure compensation device, a cone component, semiconductor refrigeration components, a circuit cylinder and a collection cylinder. Two ends of the pressure-retaining cylinder are respectively equipped with a first and second seal mechanisms, and the cone component is arranged in the pressure-retaining cylinder. The pressure compensation device is connected to the pressure-retaining cylinder through a high-pressure pipe. The semiconductor refrigeration components are arranged outside the pressure-retaining cylinder. The circuit cylinder is equipped with a power supply and a controller, and the semiconductor refrigeration components are connected to the controller. A pressure sensor and a temperature sensor are arranged inside the pressure-retaining cylinder, and respectively connected to the controller. The collection cylinder communicates with the valve hole of the second seal mechanism through a pipeline.

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.