ANALYTICAL CALCULATION AND OPTIMIZATION OF THE BASIC ELECTROMAGNETIC LOSSES OF THE ENERGY OF THE FREQUENCY-REGULATED ASYNCHRONOUS ENGINE IN THE START-BRAKING REGIMES
Journal Title: Електромеханічні і енергозберігаючі системи - Year 2017, Vol 4, Issue 40
Abstract
Purpose. The purpose of the proposed article is to obtain analytical dependencies for calculation and optimization of the main electromagnetic energy losses and acceleration and deceleration times of frequency-controlled asynchronous engines with various existing types of speed variation in the start-braking regimes. Methodology. When performing the goal, similarity methods, analytical interpolation and mathematical analysis were used. Results. Analytical dependencies are obtained to calculate the current electromagnetic power losses and the main electromagnetic losses of the energy of a frequency-controlled asynchronous engine in the start-braking regimes with various existing types (linear, parabolic and quasi-optimal) of the velocity variation. As a result of the solution of the optimization problem, analytical dependencies are obtained that ensure the calculation of the minimum possible (optimal) values of the main losses of electromagnetic energy of this engine in the start-braking regimes with the indicated different types of speed variation and allow to calculate the corresponding optimum values of acceleration and deceleration times of the engine. On the basis of the obtained analytical dependences, an engineering technique for calculating the optimal (minimally possible) basic electromagnetic energy losses of a frequency-controlled induction engine in the start-braking regimes, characterized by the presence of two steady-state values of the speed in the operating cycle of the drive, was developed. Originality. The scientific novelty of the obtained results consists in the fact that for the first time analytical dependencies were obtained for calculating the optimum values of the main electromagnetic energy losses and the optimum values of acceleration and deceleration times of the frequency-controlled asynchronous engine in the start-braking regimes with various existing types of speed variation. Also, for the first time, a change in the dynamic moment in the form of a temporal function of the hyperbolic cosine was established for a quasi-optimal type of speed change, and the effect of changing the moment of inertia of the drive on the optimal values of the main electromagnetic energy losses and the optimum values of the acceleration and deceleration times of the frequency-controlled induction engine in the start-braking regimes were estimated. Practical value. The practical value of the results obtained lies in the energy savings achieved in their use in frequency-controlled asynchronous electric drives by reducing the main electromagnetic losses in the engine by optimizing their acceleration and deceleration times in the start-braking regimes. The received results of researches and the developed engineering technique are recommended for use at designing new and operation of existing frequency-controlled asynchronous electric drives.
Authors and Affiliations
Volodimir Volkov
Keywords
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