The effectiveness of the implementation of systems with variable frequency drives

Electric motors are widely used in many areas of human activity. They are especially used in manufacturing, eliminating the need for labor: instead of a human, a machine does the work by converting it into mechanical electrical energy in particular, it is characterized by the frequency of rotation of the motor shaft. But since the speed of asynchronous and synchronous motors, often used in industry, depends on the frequency of the supply alternating current, in order to change the speed of rotation of the rotor, it is necessary to change the frequency of this very current. For these purposes, a special device has been created – frequency converter Its use is effective in many areas

 

Drilling rigs

One of the types of rotary drilling is rotary drilling, in which the rotation of the drill string is transmitted from a rotary electric motor. During the formation of a working (well), the drilling tool can pass through different types of rocks: clay, pebbles, sand, etc. To effectively pass through different formations, it is necessary to choose the appropriate modes of operation of the drilling rig – correctly combine the rotation speed of the destructive tool with the volume of inflow and discharge of the flushing fluid to the bottomhole The destruction rate depends on the pressure created by the drill string and the rotational speed applied to the bit by the engine on the surface The volume of fluid inflow and removal depends on the operating mode of the compressor, in which the engine is also installed regulate the operation of engines that drive both the drill string and the working elements of the compressor

 

Machines

Different materials have different densities and hardness, and therefore, in order for the controlled destruction of materials to occur efficiently and according to the task, the speed of processing parts from different materials on machines is different On machines without numerical control, the speed of movement of working tools is set manually, and on machines with CNC – automatically, programmatically In any case, the frequency converter is accessed, which changes the rotational speed of the rotors of the used asynchronous motors

 

Mills

Taking into account the different density of materials, the mode of operation and mills is selected – devices for grinding solid objects For the most dense, a lower speed of rotation of working tools is selected, for the least dense, and therefore fragile, high speeds are set Industrial mills, the destructive tools of which are driven by an asynchronous motor, have a frequency converter in their structureVacuum is achieved by the operation of fans connected to asynchronous motors. If smoke occurs, the speed of the draft machines can be increased, due to which a stronger vacuum will be created and smoke will be better removed. The frequency controller also changes the frequency of the unit's engine

 

Thus, the use of frequency-controlled systems shows efficiency in many areas. The ability to change the operating mode of equipment with electric motors saves energy and reduces wear on other elements of the system