The use of ultrasonic radiation showed an advantage over the existing methods of dismantling the windings of electric motors (EM). The method is based on the cavitation impact of ultrasonic vibrations and the capillary effect, which helps the caustic soda solution (NaOH) to quickly penetrate into the thickness of the lacquer impregnation and contribute to the destruction of the insulation from the inside. Analysis of dismantling of EM windings on the basis of ultrasound was carried out by the method of active experiment planning. As a result, a mathematical model of the process of removing the “burnt” EM winding was obtained, and the optimal parameters of power and duration of ultrasound, the temperature and the concentration of the NaOH solution were determined. Asynchronous electric motors (AEM) are the most widespread receivers of electrical energy. To ensure reliable and trouble-free operation of the AEM as a part of technological processes, it is necessary to implement completely new methods for their protection with the possibility of preventive action, carrying out continuous monitoring of motor parameters. In contrast to the systems of classical protection, which are triggered by faults, the system being developed makes it possible to avoid severe emergencies by predicting and detecting damages at an early stage.

A method for determining the basic energy characteristics of a hybrid car engine is presented. The technique takes into account parameters of the vehicle and parameters of the driving mode during operation. The basis of the technique is traction power and energy calculation. According to the source data, the flow of energy passing through mechanical, electrical chains and through the storage of electrical energy is determined. The technique is implemented in the form of algorithms for the calculation program and allows one to simultaneously receive the main technical characteristics of the vehicle when it is equipped with a hybrid engine of a sequential, parallel and mixed type. The presented method allows one to obtain the following values: the required power of the internal combustion engine, the required power of the motor generator, the minimum capacity of the electrical energy storage device, the estimated fuel consumption. This article presents an example of calculating the basic parameters of a combined power plant for a car weighing 1500 kg when driving it along the standard European driving test cycle. Similar calculations can also be carried out for any other cycle and parameters of the vehicle, including the bus, truck, and tractor.

No abstract

The article proposes a new device for radiation-convective heating of working fluids, which can be used in particular for emergency and repair and construction works for heating of frozen soil, concrete, road surface and other building materials. The studies were carried out as part of implementation of the Innovation Assistance Fund for Energy Sector Enterprises.

This scientific research is determined to a study of sorption process of heavy metal ions removal from aqueous solution at water purification with a help of sorption materials on a basis of residual biomass of microalgae and duckweed. It is known that Chlorella sorokiniana and duckweed Lemna minor have in their composition different valuable substances such as lipids, proteins, pigments, pectic substances. After their extraction residual biomass is formed. And in present study it is proposed for using as biosorbent for water purification. At different pH values the removal of ions of heavy metals (Zn(II), Cd(II), Pb(II), Cu(II)) occurs with varied efficiency; it is an important and informative parameter. Equilibrium and initial concentration of the solution with heavy metal ions were measured by voltammetric method of analysis with a use of special equipment. Chitosan was used as a component for making composite sorption materials with residual biomass of microalgae and duckweed. It is biopolymer which widely used in water purification. Due to this, prepared granules have good sorption properties. Nowadays in the era of technology and wide industrial production it is important and actual to develop new ecological technology and useful materials for water treatment and other fields for environment protection in general.