IMPROVING THE EFFICIENCY OF THE ELECTRICAL DRIVE FOR MAIN VALVES
The article deals with the development and application of an electromechanical drive for valves used as shut-off and regulating elements of main pipelines. We present the results of a comparative analysis of the available electric drives and a drive with an integrated linear motion actuator based on an electro-mechanical AC converter. The range of feasibility of the linear displacement electric drive is justified, taking into account the main design parameters of the device. It is shown that this drive provides the required control range due to the choice the frequency base engine rotation, rod diameter, pitch and type of thread mate. We justified the increase of the efficiency and reliability of the drive provided by combining the valve rod directly with the drive motor. We developed an analytical equation of the traction characteristics taking into account the connection between the traction forces and the linear drive speed with the height of the rotation axis, the number of poles and the nominal motor power range 0.02...1 m/s. The possibility of using machine-building method for preliminary reliability assessment is shown. The example of physical realization of the drive model on the basis of the three-phase two-pole asynchronous motor with squirrel-cage rotor with the power of 250 W and the operational characteristics of the pilot version of the drive (its power is equal to 1.1 kW) is provided.
Authors: S. N. Ivanov, K. K. Kim
Direction: Electrical Engineering
Keywords: Electromechanical drive, linear movement, pull stud, reliability
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