Modeling and simulation of electrical machines within a CCM framework

Popp, M.; Mathis, Wolfgang; Korolova, Olga; Ponick, Bernd

doi:10.1109/iemdc.2017.8002174

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…In summary, efforts considering not only order reduction techniques but also efficient model formulations, cf. Popp et al (2016bPopp et al ( , 2017b, as well as specialized numerical solvers, cf. Korolova et al (2017), are important factors for a truly efficient simulation of nonlinear large scale interconnected dynamical systems.…”

Section: Discussionmentioning

confidence: 99%

Order reduction of hierarchical interconnected dynamical systems

Popp

Mathis

2018

Adv. Radio Sci.

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Abstract. The simulation of large scale nonlinear dynamical interconnected systems, as they arise in all modern engineering disciplines, is a usual task. Due to the high complexity of the considered systems, the principle of thinking in hierarchical structures is essential and common among engineers. Therefore, this contribution proposes an approach for the numerical simulation of large systems, which keeps the hierarchical system structure alive during the entire simulation process while simultaneously exploiting it for order reduction purposes. This is accomplished by embedding the trajectory piecewise linear order reduction scheme in a modified variant of the component connection modeling for building interconnected system structures. The application of this concept is demonstrated by means of a widely used benchmark example and a modified variant of it.

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Section: Discussionmentioning

confidence: 99%

Order reduction of hierarchical interconnected dynamical systems

Popp

Mathis

2018

Adv. Radio Sci.

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“…Mishin et al (2022) established the quantitative and qualitative dependencies of an induction machine analytically, which was carried out considering the classical theory of an idealised induction machine, where the main physical parameters and electromechanical energy conversion processes are represented in the form of equations of electrical equilibrium and drive motion. The presented generalised equation system in differential form in M. Popp et al (2017) makes it possible to calculate dynamic and static processes for symmetrical and asymmetrical modes under given machine parameters and excitation conditions. Physical processes and features of CIG design solutions, caused by the for the electrical equilibrium of the stator phases.…”

Section: Introductionmentioning

confidence: 99%

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2023

machinery

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The relevance of developing analytical methods for studying the stability of root crop cleaners on tractors is determined by the need to improve the efficiency and quality of root crop head cleaning, as this affects the quality of the final product and its marketable properties. The research aims to increase the stability of the cleaner movement by constructing a mathematical model of its oscillatory motion in the longitudinal-vertical plane and its numerical solution to determine the influence of parameters in response to external disturbances. To achieve this goal, a new theory of the movement of a root crop head cleaner in the longitudinal-vertical plane, mounted behind a wheeled tractor, under the influence of the disturbing effect of irregularities in the longitudinal profile of the soil surface on the amplitude and phase frequency characteristics of its angular oscillations was developed. Using numerical calculations carried out on a personal computer, the conditions were found under which the stability of the cleaner's movement in the specified plane will increase when the stiffness coefficient of the pneumatic tyres of the doubler wheels is 315 kN•m -1 .• This result is achieved when the pressure in the pneumatic wheel tyres is 135 kPa. As for the damping characteristics of the doubler wheel tyres, which are determined by the coefficient μ, it was found that when it changes from 350 N•s•m -1 to 1350 N•s•m -1 , there is an invariance of the delay in the reaction of the cleaner to the disturbing effect when its frequencies change from 0 to 24 s -1 . It was also found that the influence of the geometric dimensions of the cleaner is insignificant in the range of frequencies of oscillations of the ordinates of the longitudinal profile of soil surface irregularities from 0 to 24 s -1 . This follows from the nature of changes in the obtained amplitude-frequency and phase-frequency characteristics. The methodology for constructing a mathematical model of the plane-parallel oscillatory motion of the cleaner can be used in similar analytical studies of other agricultural machines mounted on a wheeled aggregating tractor

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“…The known solution for calculation of T=f(s) of these machines [21], [22] requires knowledge of data of structural elements of IMs, and these values most often cannot be found, especially for old machines to be replaced and for new series there are no catalogs, and the developers have no desire to publish this intellectual property. Any other effect, for example, skin effect in deep-slot rotor, requires consideration of a complicated equivalent circuit, and there are different approaches to the degree of detailing of the circuit itself, as different approaches have been proposed: physical descriptions and approximation/optimization procedures [17], [21]- [26]. Excessive approximation increase in the number of branches in the rotor leads to very cumbersome transformations in the field of complex numbers, and the obtained formula becomes of great value.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, due to the frequent lack of necessary data, and accurate data-even more so, there is no confidence that the obtained solution can claim an engineering accuracy of 2% to 3%. Such situation leads to search of approximation solutions not within the limits of physical effects [21], [25], [26], but to use of numerical optimization procedures [27], "fitting" the curve ω=f(T) to motor data from a nameplate (shield) and from catalogs (rated, or nominal data, and critical and starting torque). At the same time, according to the information from the developer of the quite successful program [27], the convergence of the optimization procedure was not ensured for every sixth engine (out of 300 double-cage machines processed).…”

Section: Introductionmentioning

confidence: 99%

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Analytical transformations software for stationary modes of induction motors and electric drives

Qawaqzeh

Miroshnyk²,

Osichev

et al. 2022

IJECE

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<span lang="EN-US">A program was developed in the package of symbolic transformations Maple. It provides automatic analytical transformation and derivation of formulas and plotting of the main characteristics of induction motors (IM) in a convenient form for an electrical engineer and student: torque=f(slip) T=f(s), angular speed=f(Torque) ω=f(T), angular speed=f(Current) ω=f(I), current=f(slip) I=f(s); cos(φ) and phase angle (phi) φ for stator currents and rotor currents, and magnetizing circuit, machine efficiency η=f(s) and a number of other characteristics. The calculation is based on the equivalent circuit of IM motors in its different variants: with one cage in the rotor, with two or more cages in the rotor, taking into account the skin effect in the rotor rods and without it. The user can build up the equivalent circuit to the desired configuration. The algorithm of further transformations is based on analytical obtaining of amplitude/frequency and phase/frequency characteristics in the nodes of the equivalent circuits with further calculation by power and slip. Online animation of the graphs with alternate variations of all resistances R and inductances L values of the model is provided. The article contains screenshots of important parts of the programs and illustrates the complete set of graphs.</span>

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Modeling and simulation of electrical machines within a CCM framework

Cited by 8 publications

References 6 publications

Order reduction of hierarchical interconnected dynamical systems

Order reduction of hierarchical interconnected dynamical systems

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Analytical transformations software for stationary modes of induction motors and electric drives

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