Scientific Journal of KubSAU

This article offers adaptive control algorithm for fre-quency converter. It can make decrease expenditure of energy and increase coefficient of efficiency of pump of water supply systems

The article presents an overview of the run-in and testing of internal combustion engines, the analysis of break-brake- stands. We gave recommendations on expediency of the application of asynchronous motors with phase rotor winding on modern stands; we also considered its advantages over asynchronous motor with a short-circuited winding. As an alternative to the modern techniques, we have proposed a scheme of adjustable ballast circuit rotor using PWM modulation current. The process of adjustable ballast resistance and implementation of major break-regimes using the proposed device was also considered in this study

This article offers four masses thermal model system that allows you to determine the thermal state of the motor in the brake of the drive

This article presents main water supply systems and justifies the choice of direct flow of water supply system in the application of regulation of electric drive for pumps, which doesn’t have any tanks to create pressures required for fire-governmental purposes. This avoids interruption in the supply of reserve while water freezing. In the article the substantiation of the necessity of implementation of adaptive algorithm in modern-WIDE frequency converters by a substantiation of the number of stages of ratio control of voltage-frequency mains. It was revealed that the number of degrees of regulation of 10-12 gives optimum. Modern frequency converters allow you to change the regulation law, establishing 3-5 points of regulation. Therefore, the introduction of adaptive algorithm will reduce the power consumption of the electric drive of the pump of the water supply system. The article shows the simulation model of the "the converter frequency-induction motor," plots of the stator current of mains frequency and active power, surface speed and phase current when changing the voltage and frequency of the mains. These dependences confirm to have applicability of adaptive algorithm in the regulation of modern frequency converters with the skalar administration. Simulation model confirms the sub-physical experiments on a real motor and frequency converter with adaptive control algorithm. As a result of the selection of the parameters, we obtain the voltage reduction of the phase current, and reduce electricity consumption by 5-7%