| 摘要 |
A compact well pumping unit actuated by a linear motor with one or more counterweights directly attached to the slider. In one embodiment, two slider units are joined to form a rectangular complex around a two-sided stator track mounted vertically inside of a vertical steel frame. A belt assembly connects the slider complex to the polished rod of the well pump. The belt assembly passes over a first set of pulley wheels mounted on top of the vertical steel frame and a second set mounted on the side of the vertical steel frame. Thus when the slider complex caused to moves up and down, the polished rod of the well pump is actuated by the linear motor.
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