At present, the oil field pumping equipment in order to kowtow pumping beam the most common, the number is also up, but the prevalence of traditional kowtow machine starts the impact of large, multi-run power consumption, and low big horse car, efficiency and many other issues, coupled with the well situation is complex, oil, wax, Shaka phenomenon more broken rods, burning electrical phenomenon often happens, there is no reliable motor protection, equipment maintenance of large, therefore, an urgent need for cash Some of pumping equipment for transformation. In the early wells, because of just mining, oil storage capacity, using the inverter runs at 65HZ, frequency increased by a third, with a corresponding 30% increase in motor speed, it is also a corresponding increase in the use of oil, and its overall oil production rate comparable workers Under the multi-frequency oil 20%, efficiency improved by 1.2 times, popular with oilfield workers. In late wells, wells due to reduced reserves, motor-frequency line if still bound to a waste of energy, resulting in unnecessary losses, and thus reduce the speed of the way we used to reduce the stroke, typically operates at a frequency inverter to 35-40HZ between, so the motor speed dropped 30 percent, coupled with production equipment is generally lighter load, saving rate of about 25%, and improve the power factor, reduce reactive loss. Converter with soft start / soft stop function, when the motor is started, reducing the sucker mechanical shock, heavy oil, wax, Shaka, etc. can be protected effectively shut down to protect the electrical and mechanical equipment, reduce the amount of maintenance to prevent broken rod, the drive for overvoltage, undervoltage, overload, short circuit and motor stall can reliably protect, to extend the life of the motor, reducing the wear and tear of machinery and equipment, etc., have a very good role. 

keywords: St. Ling, Ling St. electromechanical, LSPTC, pumping units, inverters, motors, machinery and equipment,