Abstract
The asynchronous electric motor is used in the electric stock industry. The inverter adjusts the speed of an asynchronous motor from level 0 to rated speed. An oil pumping plant comprises the bottom machine and the surface machine. The lower machine consists of the depth pump, gas and sand separator, extraction pipe, pump rods. The surface tool includes the pump unit and other equipment. In turn, the pumping unit consists of the rocker, mechanical gearbox, connecting rods, cranks and electric motor. In pump extraction processes, maximum engine speed and / or power is not required. Significant reductions in power consumption can be achieved by adjusting the engine speed with the help of a converter. This solution can reduce production costs and increase productivity by up to 50-60%. The paper is dedicated to studying the regulation of the asynchronous electric motor using a converter controlled by a Siemens PLC. The equipment used is didactic, being produced by the company ASTI Romania.