Beam Pumping Unit
Beam pumping unit, commonly known as “nodding donkey”, is the main lifting equipment in rod pumping systems. It converts motor rotation into reciprocating motion of the sucker rod via four-bar linkage to drive the downhole pump.
Beam pumping unit, commonly known as “nodding donkey”, is the main lifting equipment in rod pumping systems. It converts motor rotation into reciprocating motion of the sucker rod via four-bar linkage to drive the downhole pump.
Low energy efficiency; four-bar linkage is not an efficient transmission
Difficult balance adjustment, high energy consumption
Rough control; traditional asynchronous motor with fixed frequency makes stroke adjustment hard
INVT GD350-13 VFD has built-in application macro for beam pumping units. Built-in braking unit is available in common power ranges. It supports synchronous and asynchronous motors, and realizes up/down speed separation, various rocking modes and flexible control.
Permanent magnet retrofit, energy saving and efficiency improvement: semi-direct drive reduces mechanical loss; high power factor of PM motor
Flexible control, rod break prevention: VFD judges mechanical status via torque variation to reduce shock
Low-frequency high-torque: easy heavy-load starting
Special oilfield model with internal braking unit
Built-in algorithms for synchronous and asynchronous motors
200% starting torque for heavy-load conditions



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