Patents Assigned to Millennium Oiflow Systems & Technology Inc.
  • Surface motor direct-drive sucker-rod screw pump device
    Patent number: 9059606
    Abstract: A surface motor direct-drive sucker-rod screw pump device is driven by a vertical three-phase permanent magnet brush-less DC motor, and comprises a motor controller (6), a rectifying circuit, an inversion circuit, a CPU and a driving circuit. The motor controller (6) is used to adjust the voltage and frequency of the motor by the rectifying circuit, the inversion circuit, the CPU and the driving circuit. Thus, the speed of the motor can vary from zero to the maximum. The device is easy to operate and has a higher efficiency.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: June 16, 2015
    Assignee: Millennium Oiflow Systems & Technology Inc.
    Inventors: Jun Liu, Songbo Gou, Yongjian Tang, Hengli Cong