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Paper is devoted to research of start-up modes of high-voltage asynchronous motor multi-stage blower. To reduce a voltage dips during starting of such motors are widely used soft starters based on a thyristor voltage converters. For high inertia drives with a long start-up mode an acceleration can be accompanied by overheating of the motor windings. In this paper we evaluated the possibility of reducing...
An example of the design and implementation of the sensor vector control system with the synthesis of speed and current regulators for the induction motor, which can be used in laboratory and practical classes is considered. The structure of vector control system of induction motor with orientation on the vector of the rotor flux is proposed. Special attention is paid to the possibilities of using...
Power hardware in the loop (PHIL) system for electric drives application based on power converter with Field Programmable Gate Array (FPGA )control system which realizes in real time model of converter, motor and mechanism is discussed. PHIL-system is intended for converters testing and for their operating modes studying. PHIL-system repeats electric drive instantaneous current and angular velocity.
Paper is devoted to research the dynamics of thermodynamic models for Totally Enclosed Fan-Cooled (TEFC) induction motors on the basis of the thermal lumped circuits. Clusterization a series of TEFC motors motors for general industrial application was performed. It allowed to group motors into clusters with consimilar parameter vectors of 5-node thermodynamic model. With using a method of genetic...
This paper is devoted to modeling and numerical simulation of electromechanical transients in a passive suspension single degree of freedom system with eddy current dampers (ECD). The damper consists from an inductor with permanent magnets and a nonmagnetic conductive hollow cylindrical rotor. A mechanical actuator is used to convert a translating motion into rotation of the rotor. A full dynamic...
The features of braking modes of frequency-controlled electric drive with capacitive energy storage are considered. The equations to estimate the energy of electric drive in the braking modes and main connection diagrams of electric drive with ultracapacitors with their advantages and disadvantages are shown. The methodic of energy calculation, which are transferred to the ultracapacitor in the braking...
The presence of parasitic torque ripples is characteristic of a synchronous machine with permanent magnets (PMSM). Nonsinusoidal magnetic flux distribution in the air gap and the variable magnetic resistance of the stator slots are the reasons for these ripples. As a result, speed ripples and angular position ripples exist. This paper proposes an adaptive controller that solves this problem. Basis...
The problems of mathematical realization and software implementation of laboratory works for electromechanical systems study are considered. Example of realization of a laboratory practical work for the study of electric drive static and dynamic modes is shown.
This paper presents the development results of multi-axis motion controller for precision electric drive. There are presented hardware and software architectures of motion controller based on the single digital signal processor. The special attention is paid to the analysis of digital computing precision, estimation and improvement of sensor resolution. The designed controller allows effective servo...
The method is proposed for state observer structural optimization, which is based on the procedure of similarity transformation for control object model. The transforming matrix in this case is formed by the variation of singular numbers of controllability and observability gramians. The method allows us to form the structure of state observer with optimal balance of controllability and observability,...
The article details the concept of creating a mathematical model of an electromechanical system that contains electric motors mounted on a viscoelastic foundation. The research of the model manifested interaction of vibrational processes in electromagnetic and mechanical energy conversion. Such processes result in shaft synchronization of electric motors operated at different rotational frequencies...
The paper describes questions of realization of powerful toolkit of the analysis of dynamometer cards in controllers of systems of automation of oilwells with Sucker-Rod Pumps. Authors suggest to analyze not only surface and downhole dynamometer cards, but also to calculate a stress in rods, to make approximation and the spectral analysis of array of dynamometer card.
The article discusses the features of the control system of telescope axes' drive. Conventional PID control system can not reach a satisfaction tracking accuracy in the case of low speeds of axes movement due to elastic coupling and friction action in these two-mass systems. As a consequence in the systems oscillations occur. In this study, fuzzy adaptive PID controller is described and this controller...
This article deals with the principles of constructing and characteristics of special linear electric drives based on combined linear induction motors for nuclear robots-equipped facilities trolleys' movement inside the sealed chambers. The existing facilities have cable fed motors with reducers, or chain conveyors, or electromagnetic coupling mechanisms. Sometimes, the facilities have the ordinary...
This paper investigates the future of Vehicle-to-Grid technologies to be used in the UK in 2030 using the method of cross impact analysis. The paper describes the procedure of the cross impact matrix generation conducted to produce a multiplicity of scenarios of Vehicle-to-Grid futures. Three consistent scenarios (fossil, average and green) have been chosen for further development, interpretation...
In this paper the issues of bearings' condition monitoring of induction motors having a squirrel-cage rotor is considered. Experimental results and their analysis are presented. The works were during the test of induction motor at rated nominal mode, with bearings: healthy and alternatively with two faults, which had defects inner and outer part of bearing frame.
the article describes braking resistance parameters calculating method through the definition of recuperated energy and average power returned to the DC link. Mathematical model of power stage, which consist of rectifier, power filter, inverter with sinusoidal PWM three-sectional permanent magnet synchronous machine motor and take into account parameters of the electric drive of the azimuth axis trajectory...
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