№ 87(3), March, 2013
Public date: 30.03.2013
Archive of journal: Articles count 66, 145 kb
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STATOR WINDING OF MULTI-SPEED INDUCTION MOTORS FOR FAN DRIVES
DescriptionIn the article, we have presented the results of the harmonic analysis of pole-switching motor winding for a fan drive. The stator winding at 10/6 allow you to fully utilize the size of the basic six-pole engines, and the stator winding at 8/4 pole differ with simplified switching
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REDUCTION OF INRUSH CURRENT FOR INDUCTION MOTORS WITH CHANGING PARAMETERS OF A STATOR WINDING
DescriptionThe schemes of the stator winding with double-wide-phase zone, allowing limiting the level of inrush current of induction motors without breaking the circuit power are presented in the article
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ABOUT THE ACTION OF LOWER HARMONICS ON THE START OF AN INDUCTION MOTOR
DescriptionIn the article, the results of the analysis of the two-layer pole-switching winding, containing considerable amplitude of lower harmonics are shown. We have also investigated the effect of lower harmonics on the start of an induction motor
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Description
The article shows the test procedure and the value of the overvoltage in fault-free phases achieved dependencies on the moment of a one-time single-phase ground fault at the 35 kV voltage with an insulted neutral
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MATHEMATICAL MODELING OF SYNCHRONOUS MOTORS FOR AGRICULTURAL ELECTRICAL POWER SUPPLY SYSTEMS
DescriptionThe article presents mathematical models for both salient pole and non-salient pole synchronous motors represented as electrical circuits with dependent sources, which can be used for the transient analysis of agricultural electrical power systems
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Description
In the article, we have motivated the definition of the problem of increasing of efficiency of oil production with complicated conditions. We have also considered general system problems of increasing of the efficiency of oil production with the methods of the improvement and renovations of the equipment: the equipment for optimization of the factor of the extraction of oil; oil well rod pumping units and principles of energy saving on the late stage of the production of the bore holes with complicated condition of exploitation. It is shown, that the equipment allows optimizing the factor of the extraction of oil when developing hard extraction oil stocks, combined with modern technology and methods
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PREOZONIZATION AS A BIOLOGICAL WASTEWATER TREATMENT INTENSIFICATION METHOD
DescriptionThe results of the research of wastewater treatment including pre-ozonization have been presented. The suitability of wastewater pre-barbotage in the storage tanks has been shown. Addition of ozone in small quantities (0,2 ÷ 0,02 g/m3) can improve the wastewater treatment results in the aeration process. Addition of ozone in small quantities doesn’t lead to the significant energy consumption at once. The treated wastewater transparency increases to 50 cm depth
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Description
In the article, we have calculated the cost of the combined energy of the proposed four types of the multifunctional units and their optimal system for the conditions of grain harvesting in the Krasnodar region; the analysis of the costs has also been reviewed
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DEVELOPMENT OF RATIONAL OPERATION OF A POSITIONAL DC ELECTRIC DRIVE WITH CONSTANT RESISTING MOMENT
DescriptionRational operation is proposed for a positional DC electric drive with constant resisting moment. Ratio between the cycle duration and electric power consumption has been identified depending on specified move
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Description
The soil properties out of playing areas of golf courses (so-called roughs) have an influence on the lawn vegetation state. Heavy texture of the soil has the cause of deterioration of the water-air properties of soil which is accompanied by changes in the nature of addition grass lawn from solid to mosaic. Non-aggressive grass of the artificial lawn has one of the reasons for renewal of native flora and the formation of a new type of plant association, closer to the natural vegetation of the Don floodplain