Surface motor direct-drive sucker-rod screw pump device

摘要

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.

主权项

1. A direct drive motor for driving a polished rod connected to a screw pump in a well, the direct drive motor comprising:
a permanent magnet motor coaxially positioned above a well head; the permanent magnet motor comprising a stator and a rotor, the stator driving the rotor, the rotor comprising a hollow shaft that is sized to receive the polished rod; the polished rod extending down into said well and coupled to said screw pump; and a rotational clamp for clamping the polished rod above said permanent magnet motor and supporting the polished rod within the hollow shaft such that the polished rod rotates with the rotor.