公开(公告)号：US20230059542A1

公开(公告)日：2023-02-23

申请号：US17886798

申请日：2022-08-12

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Ming YANG ,  Yangyang CHEN ,  Dianguo XU

IPC: G05B17/02

Abstract: Disclosed is a method for tuning stiffness of a servo system, including: reconstructing a characteristic signal of a servo system; calculating a vibration characteristic covariance coefficient of the servo system according to the characteristic signal; and tuning the stiffness of the servo system according to the calculated vibration characteristic covariance coefficient. By reconstructing the characteristic signal of the servo system, relationships between parameters of the system and the characteristic signal of the system are determined, and then, system stiffness tuning is carried out by calculating the vibration characteristic covariance coefficient of the system. In the process of tuning the stiffness of the servo system, a tuning judgment is made according to the system's own parameters without relying on a special locus, thus increasing the compatibility and intelligence degree of an algorithm.

公开(公告)号：US20210075354A1

公开(公告)日：2021-03-11

申请号：US16772160

申请日：2018-05-25

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY ,  HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Wei SUN ,  Dianguo XU

IPC: H02P21/13 ,  H02P21/04 ,  H02P21/18 ,  H02P21/28 ,  H02P27/12 ,  H02P21/00 ,  H02P6/18

Abstract: A virtual voltage injection-based speed sensor-less driving control method for an induction motor is provided. First, a virtual voltage signal is injected into a motor flux linkage and rotating speed observer so that there is a difference between an input of the motor flux linkage and rotating speed observer and a command input of the motor. Then, based on any type of the motor flux linkage and rotating speed observer, a motor flux linkage rotation angle and a motor rotor speed are estimated, and the induction motor is driven to run normally with a certain control strategy (such as vector control). Then, based on a signal designed according to this method and injected only into the motor flux linkage and rotating speed observer, the induction motor driven by a speed sensor-less control system for the induction motor may be ensured to output 150% of a rated torque when running at a motor low synchronous rotating speed and a motor zero synchronous rotating speed, and the stability thereof may be kept for a long time.