-The article considers a wind-solar generator based on special electric machines for power supply of various objects. The subject of this article is a wind-solar generator intended for simultaneous conversion of solar energy (using a photoelectric converter) and wind into electrical energy according to end-user performance (U = 380 V, f = 50 Hz). This work was carried out within the research conducted at Kuban State Technological University in the field of renewable energy sources under the guidance of professor B. Gaitov, the Honored worker of science and technology of the Russian Federation. The purpose of this work is to study the transient processes of a wind-solar generator. The results of this work is the mathematical model created in the "Matlab" software that allows one to take into account the electromechanical and electromagnetic processes, which take place in the wind-solar generator. The authors also formed oscillograms of the transient processes of the output voltage of the wind-solar generator when the input quantities change).

The engine-separator of combined design is considered in the article. The subject of this article is temperature field investigation of the engine-separator with a combined design. The purpose of this paper is to review and analyze the application of an oil separation unit based on a separator engine at oil and gas facilities. The article describes a method for oil separation based on the use of a combined engineseparator design; the use of losses in the rotor, which is the separator drum, as "heating" losses heat during separation of product in the separator drum; the use of the energy losses released by separator engine core and stator winding for preheating the separation product. The authors studied the questions connected with construction of a temperature field of the machine in order to improve the machine design and reduce the power consumption.

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-The authors conducted a review of a number of pumps for pumping oil and oil products of a traditional cylindrical (radial) construction. Their critical analysis is presented in the paper. In addition, the shortcomings and advantages of the pump are described. The designs of axial centrifugal pumps were developed by the authors for pumping petroleum products, allowing one to protect the stator winding of the pump motor against harmful mechanical and chemical influences of the pumped liquid, to reduce the gap between the stator and the rotor of the pump motor by increasing the rigidity of the structure, to improve the weight and size indicators of the pump unit, to reduce its cost, to simplify the design and to increase its reliability in general, and also to reduce energy losses and, accordingly, to increase the efficiency with decreasing heating of the pumped liquid.