DYNAMIC PROPERTIES AND TRAJECTORY SENSITIVITY OF VARIANTS OF POSITION ELECTROMECHANICAL SYSTEMS
Journal Title: Електромеханічні і енергозберігаючі системи - Year 2018, Vol 4, Issue 44
Abstract
Relevance. Positional electromechanical systems are essential for an automation of technological processes. The existing approach to the implementation of such systems consists in the generating of motion trajectory, which has to track the positional electric drive. Usually, positional systems perform with proportional-integral speed control of an electric drive, subordinated to the proportional position controller. Such system can be referred as typical one. As other approach is the variant of the alternative position system with the reference model of the control loop and the proportional speed controller. Based on the properties of cascade control, such system will have less response time, which is important to ensure a reduction in the tracking transient error. But it hasn’t any comparative information about dynamic properties of these systems. Purpose. The research is carried out to analyze the dynamic properties of variants of positional electromechanical systems, including the sensitivity evaluation to parameter changing of control systems. Methodology. The analysis and simulation of systems is performed using mathematical description of systems in the state space observable form. Such approach gives the possibility to scale the results for visualization. The parameters of speed and position controllers were determined with the help of the modulus criterion of optimization. Results. It has been determined that a typical system with a proportional-integral speed controller for an electric drive has worse dynamic characteristics. The computer simulation demonstrates that the alternative system has the response time approximately in 2 times better, and the maximum of dynamic error at the load step increasing is less on 26 % than in the typical system. Also the dynamics quantities have been evaluated based on the trajectory sensitivity of both systems. As a result, the lower sensitivity to changing in the main parameters was obtained for the typical system. An exception is the position control coefficient, the sensitivity to changing of which is approximately the same in both cases. It is noted that the correction of positional reference signal as a function of the first and second derivatives of this signal provides the typical system reference performances almost the same as for the system with the reference model, but the system becomes more sensitive to parameter changes. Practical value. The research results provide a basis for variant choice of the positional system for practical application, depending on the requirements of technological process.
Authors and Affiliations
Sergii Starostin, Luchana Rotkevich
Keywords
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- EP ID EP660021
- DOI 10.30929/2072-2052.2018.4.44.8-13
- Views 145
- Downloads 0
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