The article analyzes the existing systems of electromechanical transmission of mining trucks BelAZ. The influence of the load nature created by the uncontrolled rectifier on the power factor and mass-dimensional indicators of the electromechanical transmission isassessed. Variants of modernization of the AC-electromechanical transmission system are proposed, which provide power factor correction. The influence of the proposed options on the overall dimensions of the electromechanical transmission is considered. Based on the assessment, a modernization option was chosen that provides the required power factor with minimal impact on the overall dimensions of the electromechanical transmission. The results of modeling the operation of the existing electromechanical transmission and the modernized electromechanical transmission system using the most promising modernization option are presented.
From the example of active semisubmersible drilling rigs it is shown characteristics of electromechanical complexes of drill rigs and anchor position control systems on the base of controlled electric drive with directcurrent motors. It is presented suggestions which allow increasing electric power and service reliability criteria through the use of semiconductor converters supplied from power semiconductor converter with active front end in technological drilling systems, propulsion and position control systems of electromechanical systems on the base of noncontact asynchronous motors. It is outlined information about experience of using such kind of electromechanical complexes at the objects of mining industry working in difficult operating conditions. It is presented information about developing of electromechanical complexes of displacement systems, position control systems, technological and technical shelf development equipment and their characteristics. Also it is outlined structures and examples of designing modern high efficiency systems with contactless actuating motors.
The problems of selecting the type and the structure of mining and transport machines elec-tromechanical control system, providing energy efficiency and performance. The conclusion about the most admissibility of variable frequency drives with induction motors and power semiconduc-tor converters was made. The methods and technical means of improving the energy efficiency of asynchronous electric motors due to the choice of increased power characteristics motors, design of special motor control algorithms and applying of semiconductor converters with active rectifi-ers, providing high power factor and improving of the electricity supply quality were reviewed. To improve the operational characteristics prompted use of diagnostic systems and residual life as-sessment of electrical equipment. Implementation of designs tied to the excavator-transport sector. The schemes of the excavator power drive, mining truck and implemented complex picture at coal mine are shown.
The analysis of algorithms of management and diagnostics of the electromechanical equipment of dredges is made. Advantages of algorithm of a direct control of the moment and a method wattmetrografy for problems of monitoring and equipment diagnostics are shown.
The method of diagnostics and estimation of a residual resource of the electromechanical equipment, based on the analysis of electric parameters is offered. Block diagram’s of a diagnostic complex and the data processing program are presented. The way of application of artificial neural networks for data processing of diagnostics and an estimation of a residual resource is considered, and also levels of influence of damages on working capacity of the equipment are resulted.
The review of existing methods of technical diagnostics of an industrial electric equipment is submitted, expressions for definition of the basic diagnostic parameters are resulted at diagnostics of a condition of the equipment on electric parameters.
The method of monitoring and estimation of a residual resource of the electric equipment, based on the analysis of spectrograms of consumed electric capacity is offered. The function chart of the information-diagnostic complex realizing the given method is submitted.
The structure and algorithms of control by technological complexes with use of electromechanical systems with semi-conductor converters is resulted. Algorithms of a direct control by the moment in electric drives of an alternating current and maintenance of electromagnetic compatibility are considered at use of active rectifiers.
The article describes the history of the formation and development of the Faculty of Mining and Electrical Engineering at the St. Petersburg State Mining Institute. Its current state is described. Information about leading scientists, founders of the faculty is presented.
In connection with the intensive development of shelf zones of seas and oceans, it is proposed to replace DC motors in the system of stabilization of technical means of shelf development with AC motors with a modern control algorithm.
The article considers electric technologies of thermal drilling of deep wells in ice sediments and electrothermal installations for enhanced oil recovery in formations with heavy high-viscosity oil. The characteristics of the downhole electric heater and the results of the enlarged technical and economic evaluation of the effectiveness of electrothermal complexes are given.
In the article, the main directions of the 2000 research in the field of creating electrical complexes for mining oil gas industries are considered. They are: the application of non-contact regulated power drive with control algorithms for mining machines and mechanisms; ensuring higher productivity and energy saving development of electrical technologies and special technical means for mining operations development of automated electrical complexes and systems based on the introduction of microprocessor technology; design, development and implementation of computer technology and automated control of energy consumption and adaptation of new types of electrical equipment, ensuring increased reliability and efficiency of electrical complexes; development and implementation of the concept and algorithms of usage management in oil production complexes; development of automatic control system of multifunctional resonant angle transducers with motion of different frequency and amplitude; application of methods of direct electrotechnology, based on electromechanical transfer of electric field energy in the rock proper to obtain technological effect development of electrical complexes of automatic and automated systems, which can be designed and developed as autonomous systems of different purposes.
Программа "ДИСПАС" разработана в Московском авиационном институте и позволяет формировать программу расчета на ЭВМ по структурным схемам исследуемых объектов ...
Для анализа спектрального состава выходного напряжения тиристорного непосредственного преобразователя частоты с принудительной коммутацией (ТНПЧ-ПК), предложенного ранее, воспользуемся следующим выражением ...
