Surface motor direct-drive sucker-rod screw pump device
AssigneeMillennium Oilflow Systems & Technology Inc.
InventorsJun Liu, Songbo Gou, Youngjian Tang, Hengli Cong
Life of this patent
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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.
Claims16
A direct drive motor for driving a polished rod connected to a screw pump in a well, the direct drive motor comprising:
- an electric motor with a hollow shaft, the hollow shaft being sized to receive the polished rod;
- and
- a clamp for clamping the polished rod and supporting the polished rod within the hollow shaft.
Dependencies are inferred from the claim text.