Abstract
The operation features of the stop valve electric drive are analyzed. It is found that the drive of stop valves, implemented on the basis of induction motors, is characterized by low energy efficiency. For the purposeful improvement of the energy efficiency of the electric drive, a method is developed for estimating the energy efficiency of the valve module. The need to develop the method is due to the fact that energy efficiency estimates based on international standards are valid for steady-state operating conditions, provided that the time of transient processes is neglected. Unlike traditional types of actuators, the stop valve actuator is characterized by low speeds. The use of mechanical gearboxes does not significantly reduce the drive speed, so you have to carry out pulse control of the engine or switch to a gearless drive. The efficiency of alternative engine types is estimated using the proposed method, which is based on valve positioning modeling. The trajectory of movement is formed in accordance with the control pulses applied to the windings of the motor, which is part of the mechatronic module. Testing of the method is carried out on the basis of the passport data of the 120 W AIR56A4 induction motor, which is part of a serial single-turn mechatronic module. For comparison of energy indicators, a 3-phase synchronous rolling rotor motor was chosen, whose parameters of the stator winding are similar to those of the AIR56A4 motor winding. Comparison of energy efficiency estimates showed the advantage and prospects of using gearless synchronous motors in the valve drive. The developed models allow to investigate and optimize the characteristics of the electric drive based on the tested engines, as well as to formulate the requirements for the engine design and technological parameters based on the obtained energy efficiency estimates. The proposed method of energy efficiency assessment is the basis for the implementation of a set of technical tools to assess the drive energy efficiency in real industrial conditions when performing a specific technological task.
Highlights
The operational characteristics of stop valves (SV) depend on the type of actuator used
Improvement of SV actuators, produced by AUMA (Germany), ZRA PECKY, A.S, (Czech Republic), Rotork (England), is on the way of using soft-start microcontroller devices or frequency converters that improve the energy characteristics of induction motors (IM). All this suggests that the lack of a method for evaluating the drive energy efficiency, which takes into account the specifics of the SV drive, eliminates the possibility of obtaining adequate quantitative estimates of the drive under study
The following objectives were set: – to develop a model of the SV drive based on IM with a gearbox; – to develop a model of the SV drive based on the RRM; – to test the efficiency evaluation method in real time; – to obtain quantitative estimates of the drive energy efficiency in the process of positioning the drive actuator
Summary
The operational characteristics of stop valves (SV) depend on the type of actuator used. The advantage of the gear mechatronic module is a signi ficant increase in torque on the SV drive shaft and the ability of self-braking. The disadvantages of this module are manifested in the increase in mass and dimensional parameters, the moment of inertia, as well as the decrease in the efficiency of the mechatronic module. The choice of the direction for improving the SV electric drive is formulated as the search for the best combination of electric motor and mechanical gearbox compatible with it based on the evaluation of the energy parameters of the SV mechatronic module, which determines the relevance of this work
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