The special brushless synchronous motors for oil field pumps

Full text : This paper deals with : 1) Oil and gas industries mechanisms severe duties and main demands to their field quipment; 2) technical and economical substantiate of pumps induction motors (IM) replacement by eliable almost like IM special, brushless synchronous motor (SBSM) as energy saving, tability, reliability and even ecology improving arrangement; 3) a peculiar approach during the project and construction, work of the SBSM (with the simplest constant current exiting system) to get self-stabilizing effect cost under wide range cycling torque; 4) substantiate supporting oilfield experiments and computer-assisted electrodynamic (mechatronic) lab model's studies including IM and SBSM dynamic stability analyses in conditions of supply voltage wide fluctuations and extensive cyclic moment if the spare parts. The calculated SBSM production cost is equal to 130-150 percent of IM cost. After intensive lab studies and long-run field applications SBSM was recommended for industry to replace obsolete and old IM and to plan this type SBSM for new sucker-rod oil pumps (SRP), even if the real cost of the SBSM is double of the IM cost