Patents by Inventor Hongzhong Zhu

Hongzhong Zhu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Controller and control method
    Patent number: 9417622
    Abstract: A controller has a control unit generating a control signal to control a drive motor and a friction compensation unit adding a friction compensation signal to the control signal for compensating for a positioning error caused by friction in a guide unit. When reversing the direction of movement of the movable body, the friction compensation unit generates a friction compensation signal in accordance with a function f(?) representing a friction compensation value uf by a relationship with a variable ? and asymptotically approaching the maximum value and the minimum value of the friction compensation value uf and having an inflection point therebetween, and adds the generated friction compensation signal to the control signal generated by the control unit during movement of the movable body a predetermined movement distance from before to after the reversing.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: August 16, 2016
    Assignees: DMG MORI SEIKI CO., LTD., THE UNIVERSITY OF TOKYO
    Inventors: Hiroshi Fujimoto, Hongzhong Zhu, Koji Yamamoto, Shinji Ishii
  • Controller and Control Method
    Publication number: 20150145464
    Abstract: A controller has a control unit generating a control signal to control a drive motor and a friction compensation unit adding a friction compensation signal to the control signal for compensating for a positioning error caused by friction in a guide unit. When reversing the direction of movement of the movable body, the friction compensation unit generates a friction compensation signal in accordance with a function f(?) representing a friction compensation value uf by a relationship with a variable ? and asymptotically approaching the maximum value and the minimum value of the friction compensation value uf and having an inflection point therebetween, and adds the generated friction compensation signal to the control signal generated by the control unit during movement of the movable body a predetermined movement distance from before to after the reversing.
    Type: Application
    Filed: September 2, 2014
    Publication date: May 28, 2015
    Inventors: Hiroshi Fujimoto, Hongzhong Zhu, Koji Yamamoto, Shinji Ishii