Oil well pumping unit directly driven by frameless combined type permanent magnet synchronous motor

Abstract

The invention discloses an oil well pumping unit directly driven by a frameless combined type permanent magnet synchronous motor. The oil well pumping unit directly driven by the frameless combined type permanent magnet synchronous motor comprises a bracket arranged on the ground and a base arranged on the ground. A rope hanger, a steel wire rope, a horse head, a walking beam, a connecting rod anddriving arms are arranged on the upper part of the bracket, wherein the rope hanger, the steel wire rope, the horse head, the walking beam, the connecting rod and the driving arms are sequentially connected. The upper part of the bracket is hinged to the middle part of the walking beam, the driving arm is directly driven by the frameless combined type permanent magnet synchronous motor in the base, and a counterweight is arranged on the driving arm; the permanent magnet synchronous motor comprises a main shaft, a rotor assembly fixed to the main shaft and having permanent magnetism and a stator assembly installed in the base and providing a rotating magnetic field for the rotor assembly, the driving arms are fixedly installed at two ends of the main shaft; the stator assembly is formed bycombining at least two stator units with a sector block structure; and the stator units comprise stator iron cores and stator windings wound on the stator iron cores. The pumping unit has simple structure, small volume, high transmission efficiency and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a frameless combined permanent magnet synchronous motor direct-driven oil well pumping unit. Background technique [0002] Beam pumping unit has been used for a hundred years since its birth, and is one of the main types of pumping units currently used in oil fields, and is still commonly used in oil fields at home and abroad. Conventional beam pumping units are generally driven by motors, including brackets, beams, donkey heads, rope hangers and counterweights. The middle part of the beam is hingedly mounted on the bracket, and the front end of the beam is fixed with The donkey head is connected to the rope hanger through a steel wire rope. Under the rope hanger, there is an underground oil production device. The rear end of the beam is equipped with a counterweight. The beam between the bracket and the counterweight is movably connected to the motor dri...

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Problems solved by technology

The shortcomings of this conventional beam pumping unit are: poor balance effect, low load rate, low work efficiency, and high energy consumption. In the oil production cost, the electric cost of the pumping unit accounts for about 30%, and the annual power consumption It accounts for 20-30% of the total power consumption of the oil field; at the same time, the dynamic load during operation is relatively large, especially in the process of loading and unloading, which has a large impact on the pipe rod system and is prone to danger; in field applications, conventional Beam pumping units all adopt independent control operation mode, so the initial cost investment in an oil production area is relatively large, and the overall energy consumption of the system is relatively high

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