Operation features of the pump unit on the basis of the improved induction motor in the variable speed drive are considered in the given paper. Obtaining mechanical characteristics of the pump unit as induction motor loading machine is considered. The analysis of economic characteristics received in the process of operation is carried out.
Turbomechanisms are the machines of mass application. Suffice it to say that about 25 % of all electric power generated in the country is spent for the electric drive of pumps, fans and compressors. Technical perfection and profitability of electric drive turbomechanisms substantially define the rationality of electric power use in national economy. When dealing with profitability of the electric drive not only its minimal cost and high power parameters but also such quality of the electric drive as adjustability should be kept in mind. High profitability of the electric drive allows turbomechanisms to do the necessary according to technological conditions work with the minimum consumption of energy.The purpose of the given work is consideration of mechanical characteristics features of pump units as electric drive loading machines with the help of frequency regulation.
Application of renewable power sources is the topical problem all around the world. It influences when solving three global problems: power engineering, ecology and provisions. Developing off-line system of electric supply is required for remote and long distance districts of Russia and is connected with complex application of renewable and conventional electric energy sources. Carried out investigations allowed to compute gross and technical potential of wind energy on the plain area of Western Siberia and make a conclusion concerning the possibility of using wind power installations in remote regions. To develop effective off-line electric supply systems it makes sense to apply wind power installations and diesel power plants. Such complex approach is also topical for the regions of Mongolia where there is no centralized electric supply.
Faultless operation probability mathematical model of multiphase induction motors has been elaborated. Simulation results are used for faultless operation probability prediction and optimization of multiphase induction machines of special function. Experimental results have been shown.
In relation to world economics development the problem of resource and energy saving at design, manufacturing and operation take a significant place. The aim of the proposed work is evaluation of resource saving prospects based on accuracy theory of electrical machines at their design and manufacturing. For the first time quantitative relation between accuracy of electrical machines manufacturing and resource saving prospects has been proposed. Due to spread parameters decrease during production one can provide marked resource economies at the stage of IM design. Actual spread parameters decrease is possible nowadays as motors are manufactured in small batches and with effective control system.
The paper has analyzed the temperature field of multiphase induction motors stator under one or two phases breaking and rotation frequency decreasing. The motor thermal condition could be analyzed by using modern software. In this case ELCUT soft that allows to simulate thermal field in the motor stator core is used. ELCUT calculations are based on the thermal differential equations. When the necessity for high reliability variable speed drives appeared multiphase induction motors (m>3) were invented.
The aim of the research is receiving power characteristics of the induction motor with the help of mathematical model providing energy saving when changing the core length and also the analysis of the obtained characteristics. The implementation of this technique - increase of the core length - is the trend of energy saving which can be rapidly carried out with the least expenses for introduction as the same press tools for manufacturing of rotor and stator cores are used.
